Hylomyrma dentiloba ( Santschi, 1931 )Hylomyrma dolichops Kempf, 1973

Ulysséa, Mônica Antunes, 2021, Taxonomic revision of the Neotropical ant genus Hylomyrma Forel, 1912 (Hymenoptera: Formicidae: Myrmicinae), with the description of fourteen new species, Zootaxa 5055 (1), pp. 1-137: 40-46

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Hylomyrma dentiloba ( Santschi, 1931 ) Hylomyrma dolichops Kempf, 1973
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Hylomyrma dentiloba ( Santschi, 1931)  

Figures 30 View FIGURE 30 , 31 View FIGURE 31 , 80D View FIGURE 80 , 81G View FIGURE 81 , 86 View FIGURE 86 (map)

Lundella dentiloba Santschi, 1931: 271   (W). Holotype: PANAMA: France Field, 2.vi.30, [A.] Bierig [leg.], Sammlung[collection] Dr. F. Santschi Kairouan (1W) (CASENT0913528) [NHMB] [examined]. Combination in Hylomyrma   by Kempf, 1960: 430.

Diagnosis. Head dorsum with regular and longitudinal striae, mesial striation in part directed to posterior margin and in part anteriorly divergent and posteriorly convergent, interspaces distinguishable; mesosoma covered with regular to irregular and adjacent striae of variable thickness; dorsal margin of petiole discontinuous, dorsum with same striation of mesosoma lateral; subtriangular projection on mesoventral surface of petiole; subpostpetiolar process weak, convex; transverse striae on profemur posterior surface; protibia extensor surface striate; striation on tergum of first gastral segment restricted to base.

Redescription. WORKER (n=4) ( Fig. 30A–C View FIGURE 30 ): HL 0.85 (0.84–0.92); HW 0.76 (0.76–0.84); ML 0.52 (0.52–0.60); SL 0.55 (0.54–0.60); MOD 0.21 (0.21–0.22); PNW 0.55 (0.55–0.62); WL 1.12 (1.10–1.20); PSL 0.15 (0.15–0.16); PL 0.52 (0.52–0.58); PW 0.22 (0.22–0.26); PPL 0.27 (0.27–0.32); PPW 0.32 (0.31–0.34); GL 0.85 (0.85–1.08); TL 4.15 (4.15–4.65); CI 89.70 (89.70–91.30); SI 72.13 (70.23–75); OI 27.87 (25–26.31). Small to midsized. Subopaque integument, except for the shiny gaster. Head, antennae and mesosoma light brown; yellowish leg; brownish petiole, postpetiole and gaster. Thin and mostly unbranched setae, long to midsized, suberect to subdecumbent; few branched setae with 2–3 or multiple short branches of equal size ( Fig. 80D View FIGURE 80 ), specially on gaster.

Head subquadrate; posterior margin straight. Mandible masticatory margin with 5 teeth. Anterior margin of clypeus straight medially, with a pair of small teeth laterally; median area of clypeus with regular and longitudinal striae, being 6–7 thicker striae, interspaces indistinguishable. Frontal triangle with 2–3 striae. Scape short, not reaching head posterior margin; apical antennomere shorter than 3 previous antennomeres together. Frontal carina slightly concave posterior to antennal socket. Eye reniform, midsized, larger diameter with 11 ommatidia. Striae of variable thickness on head dorsum regular to irregular, longitudinal, mesial striation in part directed to posterior margin and in part anteriorly divergent and posteriorly convergent, interspaces indistinguishable. Head lateral and laterodorsal regions with same striation of head dorsum, striae converging to eye margin; anterior part of laterodorsal region with few striae connecting the region posterior to frontal carina with eye margin; gena striate, irregular and semicircular striae circumscribe the torulus, not reaching eye margin, interspaces indistinguishable. Interspaces between striae on head ventral surface distinguishable.

Mesosoma covered with regular to irregular striae, thinner striae (microsculpture) of variable thickness superimposed on thicker striae (macrosculpture), interspaces indistinguishable. Striation assumes multiple directions; transverse striae on pronotum anterior region (DV) continuing on lateral surface in part towards propodeal spine and in part transversely on propodeum; longitudinal striae on posterior region of pronotum and mesonotum. Promesonotal junction indistinct. Metanotal groove distinguishable by a slight depression (LV). Transverse carina inconspicuous. Dorsal margin of mesosoma slightly discontinuous, mesosoma somewhat straight (mesosoma flattened dorsally). Propodeal lobe bidentate; both teeth blunt, dorsal tooth slightly longer than ventral tooth. Propodeal spine short, straight (LV), divergent (DV), sculptured, and shorter than dorsal tooth of propodeal lobe. Procoxa striae of uniform thickness; regular and transverse striae on C2 and C3. Profemur and protibia mostly covered with regular striae, transverse on profemur, longitudinal on protibia.

Dorsal margin of petiole discontinuous. Convex node; regular striae on anterior, lateral and dorsal surfaces, interspaces indistinguishable; interspaces distinguishable on node ventral surface; transverse striae on anterior surface continuing longitudinally on lateral surface; longitudinal striae of variable thickness on dorsal surface. Postpetiole and subpostpetiolar process with regular and longitudinal striae; subpostpetiolar process weak, convex.

First gastral segment striation similar to postpetiole striae; short striae on tergum, shorter than 1 / 2 of postpetiole length; laterobasal region of sternite covered with striation.

QUEEN (first description) (n=4) ( Fig. 31A–C View FIGURE 31 ): HL (0.92–0.95); HW (0.82–0.88); ML (0.54–0.58); SL (0.58– 0.62); MOD (0.24–0.26); PNW (0.75–0.78); WL (1.32–1.38); PSL (0.22–0.24); PL (0.60–0.63); PW (0.27–0.30); PPL (0.32–0.34); PPW (0.39–0.42); GL (1.08–1.12); TL (4.79–4.98); CI (89.13–93.61); SI (68.18–70.73); OI (27.90–30.48). Midsized. Color, pilosity, and some sculpture characters shared with conspecific workers, only slightly larger. Larger diameter of eye with 12–13 ommatidia. Striae of variable thickness, longitudinal, regular to irregular on scutum, going from an anterior central point towards transcutal suture; thinner striae (microsculpture) between thicker striae (macrosculpture). Longitudinal and mostly regular striae of variable thickness on anepisternum and katepisternum, interspaces indistinguishable. Axilla and scutellum with the same sculpturing pattern as scutum. Irregular striae of variable thickness on propodeum, transverse in DV, directed in part to propodeal dorsum and in part to propodeal spine of lateral surface of mesosoma, interspaces indistinguishable. Wings as in Fig. 81G. View FIGURE 81

MALE Unknown.

Etymology. Dens, - entis (Latin) = tooth; lobus (Latin) and lobos (Greek) = rounded projection or protuberance.

Comments. Hylomyrma dentiloba   is similar to H. blandiens   , H. jeronimae   , and H. macielae   . Hylomyrma dentiloba   and H. jeronimae   are restricted to Central America ( Figs. 84 View FIGURE 84 , 86 View FIGURE 86 ), co-occuring in Barro Colorado Island, Panama, whereas H. blandiens   shows a broad distribution in northwestern South America, from Bolivia to French Guiana ( Fig. 84 View FIGURE 84 ), overlapping in part with the area of distribution of H. macielae   (south Colombia and the centernorth of Ecuador) ( Fig. 86 View FIGURE 86 ). Hylomyrma dentiloba   can be distinguished from H. blandiens   (characteristic in parentheses) in the indistinguishable interspaces on head dorsum striation (vs. distinguishable), the straight dorsal margin of mesonotum (vs. convex), the propodeal spine shorter than the dorsal tooth of propodeal lobe (vs. slightly longer), and the striae length on the first gastral segment shorter to the postpetiole length (vs. similar than the postpetiole length). Hylomyrma dentiloba   can be distinguished from H. jeronimae   in the regular striae on the mesial region of the head dorsum in part directed towards the posterior margin and in part anteriorly divergent and posteriorly convergent (vs. regular to irregular striae and divergent), the drop-shaped eye (vs. reniform), the longitudinal striation on the mesosomal dorsum (vs. striae assuming multiple directions), and the discontinuous dorsal margin of petiole (vs. continuous). Hylomyrma dentiloba   can be distinguished from H. macielae   in the drop-shaped eye (vs. oval), and the straight dorsal margin of the mesonotum (vs. convex).

In molecular analysis, the specimens of H. dentiloba   from Barro Colorado Island were separated into two clusters: ( H. cf. dentiloba   sp.1 ( H. plumosa   ( H. cf. dentiloba   sp.2, H. versuta   ))) ( Pierce et al. 2017). After observing the images of H. cf. dentiloba   sp.1 (CASENT0636001) from Costa Rica, we understand that this morphospecies is H. jeronimae   n. sp. and that H. cf. dentiloba   sp.2 is the true H. dentiloba   . The voucher specimens of sp.2 still need to be examined. Also, Pierce et al. (2017) stated that H. dentiloba   and H. versuta   are morphologically identical, being differentiated only in their geographical distribution. The authors use H. dentiloba   to refer to H. dentiloba   -like material from the Osa Peninsula of Costa Rica south through Panama, and H. versuta   for material from the Atlantic slope of Costa Rica northward. However, we found that H. dentiloba   (the H. cf. dentiloba   sp.2) can be distinguished from H. versuta   in the striation with indistinguishable interspaces on the head dorsum (vs. striation with distinguishable interspaces), the mesosoma and petiolar node covered by thinner striae with indistinguishable interspaces superimposed on irregular and thicker striae (vs. thinner striae with indistinguishable interspaces between irregular and thicker striae), the profemur covered with regular and transverse striae weakly marked (vs. predominantly smooth), the protibia mainly covered with regular and weakly marked striae (vs. predominantly smooth), and the shorter striae on tergum of the first gastral segment (vs. longer striae). Hylomyrma dentiloba   can be distinguished from H. jeronimae   (the H. cf. dentiloba   sp.1) as mentioned in the previous paragraph.

Distribution. Hylomyrma dentiloba   distribution is restricted to Panama Canal Zone ( Fig. 86 View FIGURE 86 ).

Natural history. The species inhabits sites at elevations from 90 to 100 m. Some specimens were sampled in leaf-litter, which suggests that this species nests between leaves, in fallen logs, rotten wood, or inside natural cavities of the superficial soil layers.

Additional material examined (48 workers, 8 queens): PANAMA: C[anal] Z[one], Barro Colorado I., 27.ii.1976, A. Newton, leaf litter, forest floor (2W) [ MCZC] GoogleMaps   ; same locality, June-Oct-1943, Zetek -5105, Lot 43- 16534 (9W 3Q) [ USNM] GoogleMaps   ; same data (2W, one worker covered with gold) ( MZSP67320 View Materials ) [ MZSP] GoogleMaps   ; (1W) [ IHVL] GoogleMaps   ; (2W 1Q) [ IFML] GoogleMaps   ; same locality, i.1960, W.L. Brown, E.S. McCluskey, B-43 (2W) [ MCZC] GoogleMaps   ; (1W) [ MZSP] GoogleMaps   ; same locality, Apr-May-42, J. Zetek n°4953 (3W) [ USNM] GoogleMaps   ; (1W) [ CASC] GoogleMaps   ; same locality, vii.1941, JasZetek n°4852, Lot n°41-20631 (1Q) ( MZSP67321 View Materials ) [ MZSP] GoogleMaps   ; Colón: San Lorenzo, IBISCA, W13115 View Materials , F3- May 05, T146-19 (2W) [ CEPLAC] GoogleMaps   ; same data (1W) (MZHY201) [ MZSP] GoogleMaps   ; same except W13057 View Materials , F2- May 05, T145-12 (3W) [ CEPLAC] GoogleMaps   ; W13044 View Materials , F1 - May 05, T154-50 (3W) ( MZSP67473 View Materials , MZHY216) [ MZSP] GoogleMaps   ; W13090 View Materials , F2 View Materials - May 05, T145-12 (3W) [ CEPLAC] GoogleMaps   ; San Lorenzo Forest , 30.xii.2004, 9°17′N, 79°58′W, Dejean, Orivel, Corbara, Aberlenc, Leponce, B2, W12585 View Materials , Winkler (1W) [ CEPLAC] GoogleMaps   ; same except B1, W12521 View Materials (1W 1Q) [ DZSP] GoogleMaps   ; F3, W12305 View Materials (1Q) [ MZSP] GoogleMaps   ; Punta de Los Chivos, W. side Gatun Lake, 3km SW Gatun, 100m, 3–9.july.1979, W.L. Brown col., forest (10W 1Q) [ MCZC] GoogleMaps   ; Gigante Peninsula , 90m, 9.11363 -79.85430 + 1km, june.2010-july.2011, T.P. Sumnicht col., Wet forest , ex leaf litter (1W) (CASENT0643420) [ MZSP] GoogleMaps   .

Hylomyrma dolichops Kempf, 1973  

Figures 32 View FIGURE 32 , 33 View FIGURE 33 , 80G View FIGURE 80 , 87 View FIGURE 87 (map)

Hylomyrma dolichops Kempf, 1973: 239   (W, Q). Holotype: COLOMBIA: Amaz.[Amazonas]: 7km NW Letícia , 20–25 Feb 1972, #230, forest litter, berlesate, S. & J. Peck [leg.] (1W) ( MCZ35419 View Materials ) [MCZC] [examined]. Paratypes: same data as holotype (2W 1Q) ( MCZ35419 View Materials ) [MCZC] [examined]; (3W 1Q) ( MZSP67325 View Materials , MZSP67326 View Materials , MZSP67327 View Materials ) [MZSP] [examined].

Diagnosis. Anterior half of head dorsum with vermicular and divergent striae; posterior half with irregular and parallel striae; large and reniform eye; striae of variable thickness on mesosoma, interspaces indistinguishable; semicircular striae on mesonotum and metanotal groove region; dorsal margin of petiole discontinuous; profemur posterior surface mostly smooth; striae on protibia extensor surface weakly marked; long striae on tergum of first gastral segment; body with branched setae with multiple branches of equal size and lobed at tip.

Redescription. WORKER (n=4) ( Fig. 32A–C View FIGURE 32 ): HL (0.92–1.04); HW 0.98 (0.94–1); ML 0.62 (0.62–0.68); SL 0.68 (0.62–0.72); MOD 0.32 (0.28–0.33); PNW 0.72 (0.70–0.78); WL 1.38 (1.30–1.44); PSL 0.42 (0.36–0.46); PL 0.69 (0.66–0.78); PW 0.31 (0.27–0.31); PPL 0.42 (0.40–0.46); PPW 0.40 (0.37–0.42); GL 1.32 (1–1.32); TL 5.43 (4.90–5.43); CI 98 (98–102.17); SI 69.38 (65.95–70); OI 32.65 (29.78–33). Medium to large-sized. Subopaque to shiny integument. Brownish to light brown body, darker head and gaster. Thin, unbranched and branched setae, long to short, suberect to subdecumbent; branched setae with multiple short branches of equal size and lobed at tip ( Fig. 80G View FIGURE 80 ); unbranched setae mostly on head.

Head subquadrate; posterior margin straight. Mandible masticatory margin with 6 teeth. Anterior margin of clypeus straight medially, with a pair of small teeth laterally; median area of clypeus with 6–8 regular, longitudinal and thick striae, interval between thicker striae filled with thinner striae. Frontal triangle with 1 stria subdivided towards the posterior margin. Short scape, not reaching head posterior margin; apical antennomere with equal length to previous 3 antennomeres together, or slightly shorter. Frontal carina straight. Eye reniform, large-sized, larger diameter with 17 ommatidia. Longitudinal striae on head dorsum, vermicular and divergent striae on anterior half, irregular and parallel on posterior half; interspaces between thicker striae filled with thinner striae. Striation on lateral and laterodorsal regions of the head converging to eye margin; regular striae on head lateral and lateroventral regions, irregular to vermicular on laterodorsal region; gena striate, 6–9 regular and semicircular striae circumscribe the torulus, almost reaching eye margin. Interspaces between striae on head ventral surface striation indistinguishable.

Irregular to regular striae of variable thickness on mesosoma dorsum assuming multiple directions, striae forming swollen regions, interspaces indistinguishable; pronotum mostly covered with transverse striae continuing on lateral surface; semicircular striae on dorsum of mesonotum, metanotal groove region (immediate anterior to transverse carina) and propodeum. Irregular striae on lateral of pronotum and mesepisternum continuing on propodeum lateral and reaching the propodeal spine. Promesonotal junction and metanotal groove indistinct. Transverse carina inconspicuous. Dorsal margin of mesosoma continuous, convex. Propodeal lobe bidentate, acute dorsal tooth with similar length of blunt ventral tooth; dorsal tooth length shorter than 1 / 2 of propodeal spine length. Propodeal spine long, straight (LV), divergent (DV), sculptured on base. Thin striae of uniform thickness on procoxa; irregular and transverse striae on C2 and C3. Profemur covered with irregular to regular transverse striae weakly marked. Protibia extensor surface entirely covered with regular and longitudinal striae.

Dorsal margin of petiole discontinuous. Node elongated, convex; adjacent striae of variable thickness; regular and transverse striae on anterior surface continuing on lateral surface; irregular to vermicular longitudinal striae on lateral and dorsal surfaces; transverse striae on ventral surface weakly marked. Postpetiole and subpostpetiolar process with regular and longitudinal striae, interspaces indistinguishable; subpostpetiolar process prominent, convex.

First gastral segment striation similar to postpetiole striae; long striae on tergum, shorter than postpetiole length; sternite striation covering the laterobasal region.

QUEEN (n=2, paratypes) ( Fig. 33A–C View FIGURE 33 ): HL 1.02–1.06; HW 1.02; ML 0.56–0.66; SL 0.72; MOD 0.34; PNW 0.86–0.88; WL 1.50–1.62; PSL 0.40; PL 0.72–0.74; PW 0.34; PPL 0.43–0.48; PPW 0.44–0.46; GL 1.36–1.42; TL 5.59–5.98; CI 96.22–100; SI 70.58; OI 33.33. Large-sized. Color, pilosity, and some sculpture characters shared with conspecific workers, only slightly larger. Larger diameter of eye with 18–20 ommatidia. Longitudinal, regular to irregular striae on scutum going from an anterior central point towards transcutal suture, interspaces indistinguishable. Longitudinal striae of uniform thickness on anepisternum and katepisternum, mostly regular on anepisternum and irregular on katepisternum, interspaces indistinguishable. Axilla and scutellum with same sculpture of scutum. Scutoscutellar sulcus inconspicuous. Transverse and regular striae on propodeum (DV), interspaces indistinguishable. Lateral surface of mesosoma with mostly irregular striae directed to propodeal spine, interspaces indistinguishable. Wings unknown.

MALE Unknown.

Etymology. Dolichops   (Greek, dolichos = kidney-bean) is certainly a reference to the reniform eye of this species.

Comments. Hylomyrma dolichops   is similar to H. columbica   regarding the sculpture of the mesosomal dorsum, but the former is easily distinguished from the latter by the branched setae, whose branches are lobed at the tip ( Fig. 80G View FIGURE 80 ). Hylomyrma columbica   has unbranched setae. Also, Hylomyrma dolichops   differs from H. columbica   (characteristic in parentheses) in the presence of vermicular and divergent striae on anterior two-third of mesial area on head dorsum, irregular and parallel on the upper third (vs. regular striae on the mesial region in part directed towards posterior margin and in part anteriorly divergent and posteriorly convergent/parallel), and the reniform eye (vs. drop-shaped). The two species are allopatric; Hylomyrma dolichops   shows a broader distribution ( Brazil, Colombia, Ecuador, and Venezuela) ( Fig. 87 View FIGURE 87 ), whereas H. columbica   occurs in Colombia and in western Venezuela ( Fig. 85 View FIGURE 85 ).

Regarding morphological variation, three specimens from Orito , Colombia, are considerably larger than those described in the type series, although all other diagnostic characteristics are invariant   .

Distribution. This species is known from Brazil, Colombia, Ecuador, and Venezuela ( Fig. 87 View FIGURE 87 ).

Natural history. All specimens examined were collected in leaf-litter of tropical rainforest, at elevations ranging from 260 to 700 m, which suggests that nests are located between leaves, in fallen logs, rotten wood, or inside natural cavities of the superficial soil layers.

Additional material examined (7 workers): BR[ BRAZIL]: AC[Acre]: Mâncio Lima, P.N. da Serra   do Divisor, 260m, 7°27′9.22″S, 73°39′58.24″W, 15–18.xi.2016, R.M. Feitosa, T.S. Silva & A.C. Ferreira cols. (2W) [ DZUP]. GoogleMaps   COLOMBIA: Nariño: Orito, Territorio Kofan, 700m, 00°30′N, 77°13′W, 28.ix.1998, E.L. González leg., Bosque, Winkler 7 (1W) [ IHVL] GoogleMaps   ; same data (1W) (MZHY197) [ MZSP] GoogleMaps   ; same except 29.ix.1998, caída, T2T6 (1W covered with gold) [ IHVL]. GoogleMaps   ECUADOR: Orellana: Tiputini Biodiversity Station , Jan2004 – Jan2006, A.L. Mertl col., dissertation 2009, litter nest, tropical rainforest, terra firme (1W) [ MCZC]. GoogleMaps   VEN[ VENEZUELA]: Amazonas: San Carlos de R. Negro, 11.oct.1981, L. Carling col., SCRN HR/JV (1W) [ MCZC] GoogleMaps   .

Hylomyrma dolichops Kempf, 1973  

Figures 32 View FIGURE 32 , 33 View FIGURE 33 , 80G View FIGURE 80 , 87 View FIGURE 87 (map)

Hylomyrma dolichops Kempf, 1973: 239   (W, Q). Holotype: COLOMBIA: Amaz.[Amazonas]: 7km NW Letícia , 20–25 Feb 1972, #230, forest litter, berlesate, S. & J. Peck [leg.] (1W) ( MCZ35419 View Materials ) [MCZC] [examined]. Paratypes: same data as holotype (2W 1Q) ( MCZ35419 View Materials ) [MCZC] [examined]; (3W 1Q) ( MZSP67325 View Materials , MZSP67326 View Materials , MZSP67327 View Materials ) [MZSP] [examined].

Diagnosis. Anterior half of head dorsum with vermicular and divergent striae; posterior half with irregular and parallel striae; large and reniform eye; striae of variable thickness on mesosoma, interspaces indistinguishable; semicircular striae on mesonotum and metanotal groove region; dorsal margin of petiole discontinuous; profemur posterior surface mostly smooth; striae on protibia extensor surface weakly marked; long striae on tergum of first gastral segment; body with branched setae with multiple branches of equal size and lobed at tip.

Redescription. WORKER (n=4) ( Fig. 32A–C View FIGURE 32 ): HL (0.92–1.04); HW 0.98 (0.94–1); ML 0.62 (0.62–0.68); SL 0.68 (0.62–0.72); MOD 0.32 (0.28–0.33); PNW 0.72 (0.70–0.78); WL 1.38 (1.30–1.44); PSL 0.42 (0.36–0.46); PL 0.69 (0.66–0.78); PW 0.31 (0.27–0.31); PPL 0.42 (0.40–0.46); PPW 0.40 (0.37–0.42); GL 1.32 (1–1.32); TL 5.43 (4.90–5.43); CI 98 (98–102.17); SI 69.38 (65.95–70); OI 32.65 (29.78–33). Medium to large-sized. Subopaque to shiny integument. Brownish to light brown body, darker head and gaster. Thin, unbranched and branched setae, long to short, suberect to subdecumbent; branched setae with multiple short branches of equal size and lobed at tip ( Fig. 80G View FIGURE 80 ); unbranched setae mostly on head.

Head subquadrate; posterior margin straight. Mandible masticatory margin with 6 teeth. Anterior margin of clypeus straight medially, with a pair of small teeth laterally; median area of clypeus with 6–8 regular, longitudinal and thick striae, interval between thicker striae filled with thinner striae. Frontal triangle with 1 stria subdivided towards the posterior margin. Short scape, not reaching head posterior margin; apical antennomere with equal length to previous 3 antennomeres together, or slightly shorter. Frontal carina straight. Eye reniform, large-sized, larger diameter with 17 ommatidia. Longitudinal striae on head dorsum, vermicular and divergent striae on anterior half, irregular and parallel on posterior half; interspaces between thicker striae filled with thinner striae. Striation on lateral and laterodorsal regions of the head converging to eye margin; regular striae on head lateral and lateroventral regions, irregular to vermicular on laterodorsal region; gena striate, 6–9 regular and semicircular striae circumscribe the torulus, almost reaching eye margin. Interspaces between striae on head ventral surface striation indistinguishable.

Irregular to regular striae of variable thickness on mesosoma dorsum assuming multiple directions, striae forming swollen regions, interspaces indistinguishable; pronotum mostly covered with transverse striae continuing on lateral surface; semicircular striae on dorsum of mesonotum, metanotal groove region (immediate anterior to transverse carina) and propodeum. Irregular striae on lateral of pronotum and mesepisternum continuing on propodeum lateral and reaching the propodeal spine. Promesonotal junction and metanotal groove indistinct. Transverse carina inconspicuous. Dorsal margin of mesosoma continuous, convex. Propodeal lobe bidentate, acute dorsal tooth with similar length of blunt ventral tooth; dorsal tooth length shorter than 1 / 2 of propodeal spine length. Propodeal spine long, straight (LV), divergent (DV), sculptured on base. Thin striae of uniform thickness on procoxa; irregular and transverse striae on C2 and C3. Profemur covered with irregular to regular transverse striae weakly marked. Protibia extensor surface entirely covered with regular and longitudinal striae.

Dorsal margin of petiole discontinuous. Node elongated, convex; adjacent striae of variable thickness; regular and transverse striae on anterior surface continuing on lateral surface; irregular to vermicular longitudinal striae on lateral and dorsal surfaces; transverse striae on ventral surface weakly marked. Postpetiole and subpostpetiolar process with regular and longitudinal striae, interspaces indistinguishable; subpostpetiolar process prominent, convex.

First gastral segment striation similar to postpetiole striae; long striae on tergum, shorter than postpetiole length; sternite striation covering the laterobasal region.

QUEEN (n=2, paratypes) ( Fig. 33A–C View FIGURE 33 ): HL 1.02–1.06; HW 1.02; ML 0.56–0.66; SL 0.72; MOD 0.34; PNW 0.86–0.88; WL 1.50–1.62; PSL 0.40; PL 0.72–0.74; PW 0.34; PPL 0.43–0.48; PPW 0.44–0.46; GL 1.36–1.42; TL 5.59–5.98; CI 96.22–100; SI 70.58; OI 33.33. Large-sized. Color, pilosity, and some sculpture characters shared with conspecific workers, only slightly larger. Larger diameter of eye with 18–20 ommatidia. Longitudinal, regular to irregular striae on scutum going from an anterior central point towards transcutal suture, interspaces indistinguishable. Longitudinal striae of uniform thickness on anepisternum and katepisternum, mostly regular on anepisternum and irregular on katepisternum, interspaces indistinguishable. Axilla and scutellum with same sculpture of scutum. Scutoscutellar sulcus inconspicuous. Transverse and regular striae on propodeum (DV), interspaces indistinguishable. Lateral surface of mesosoma with mostly irregular striae directed to propodeal spine, interspaces indistinguishable. Wings unknown.

MALE Unknown.

Etymology. Dolichops   (Greek, dolichos = kidney-bean) is certainly a reference to the reniform eye of this species.

Comments. Hylomyrma dolichops   is similar to H. columbica   regarding the sculpture of the mesosomal dorsum, but the former is easily distinguished from the latter by the branched setae, whose branches are lobed at the tip ( Fig. 80G View FIGURE 80 ). Hylomyrma columbica   has unbranched setae. Also, Hylomyrma dolichops   differs from H. columbica   (characteristic in parentheses) in the presence of vermicular and divergent striae on anterior two-third of mesial area on head dorsum, irregular and parallel on the upper third (vs. regular striae on the mesial region in part directed towards posterior margin and in part anteriorly divergent and posteriorly convergent/parallel), and the reniform eye (vs. drop-shaped). The two species are allopatric; Hylomyrma dolichops   shows a broader distribution ( Brazil, Colombia, Ecuador, and Venezuela) ( Fig. 87 View FIGURE 87 ), whereas H. columbica   occurs in Colombia and in western Venezuela ( Fig. 85 View FIGURE 85 ).

Regarding morphological variation, three specimens from Orito , Colombia, are considerably larger than those described in the type series, although all other diagnostic characteristics are invariant   .

Distribution. This species is known from Brazil, Colombia, Ecuador, and Venezuela ( Fig. 87 View FIGURE 87 ).

Natural history. All specimens examined were collected in leaf-litter of tropical rainforest, at elevations ranging from 260 to 700 m, which suggests that nests are located between leaves, in fallen logs, rotten wood, or inside natural cavities of the superficial soil layers.

Additional material examined (7 workers): BR[ BRAZIL]: AC[Acre]: Mâncio Lima, P.N. da Serra   do Divisor, 260m, 7°27′9.22″S, 73°39′58.24″W, 15–18.xi.2016, R.M. Feitosa, T.S. Silva & A.C. Ferreira cols. (2W) [ DZUP]. GoogleMaps   COLOMBIA: Nariño: Orito, Territorio Kofan, 700m, 00°30′N, 77°13′W, 28.ix.1998, E.L. González leg., Bosque, Winkler 7 (1W) [ IHVL] GoogleMaps   ; same data (1W) (MZHY197) [ MZSP] GoogleMaps   ; same except 29.ix.1998, caída, T2T6 (1W covered with gold) [ IHVL]. GoogleMaps   ECUADOR: Orellana: Tiputini Biodiversity Station , Jan2004 – Jan2006, A.L. Mertl col., dissertation 2009, litter nest, tropical rainforest, terra firme (1W) [ MCZC]. GoogleMaps   VEN[ VENEZUELA]: Amazonas: San Carlos de R. Negro, 11.oct.1981, L. Carling col., SCRN HR/JV (1W) [ MCZC] GoogleMaps   .

USNM

Smithsonian Institution, National Museum of Natural History

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

DZUP

Universidade Federal do Parana, Colecao de Entomologia Pe. Jesus Santiago Moure

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

Genus

Hylomyrma

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

Genus

Hylomyrma

Loc

Hylomyrma dentiloba ( Santschi, 1931 ) Hylomyrma dolichops Kempf, 1973

Ulysséa, Mônica Antunes 2021
2021
Loc

Hylomyrma dolichops

Kempf, W. W. 1973: 239
1973
Loc

Lundella dentiloba

Kempf, W. W. 1960: 430
Santschi, F. 1931: 271
1931