Actinopus szumikae, Ríos-Tamayo & Goloboff, 2018

Ríos-Tamayo, D. & Goloboff, P. A., 2018, Taxonomic Revision And Morphology Of The Trapdoor Spider Genus Actinopus (Mygalomorphae: Actinopodidae) In Argentina, Bulletin of the American Museum of Natural History 2018 (419), pp. 1-84: 66-70

publication ID

0003-0090

persistent identifier

http://treatment.plazi.org/id/C22D980A-FFB3-F329-733A-F9DDD393FDF3

treatment provided by

Felipe

scientific name

Actinopus szumikae
status

sp. nov.

Actinopus szumikae   , sp. nov.

Figures 34A–G, 35A–F, 45

TYPE MATERIAL: HOLOTYPE ♂ (MACN-Ar 36554): Córdoba. Alta Gracia “La Granja” [31°39′ S 64°25′ W], Jan. 1939, C. Bruch, 1♂. PARATYPES:

1♀ (MACN-Ar 27111), same data and collector, La Cruz, Carlos Paz [31°24′ S 64°31′ W], 3 Feb. 1967, I. Di Tada, 1♂ (MACN-Ar 36555).

ETYMOLOGY: The specific name is in honor of Claudia Szumik, for her contributions to phylogenetic systematics and historical biogeography, and the collection of many of the specimens studied.

DIAGNOSIS: Males of A. szumikae   differ from those of A. argenteus   and A. longipalpis   in having a copulatory bulb with well-developed ATA and BTA (fig. 34D–F) and cheliceral prolongation without cusps (different from A. insignis   , A. gerschiapelliarum   , A. taragui   , A. puelche   , and A. palmar   ). Females are very similar to those of A. taragui   , recognizable by subtle differences in the spermathecal shape, with a squared base and a long external lobe, straight or slightly curved outward (fig. 35D, E).

DESCRIPTION: Holotype male (MACN-Ar 36554, figs. 34A–G): Total length: 10.32. Carapace (fig. 34A): length 3.24, width 3.00. Cephalic region: length 1.80, width 2.40; clypeus short with littler bristles, 6 bristles between PME and 4 behind each PME-PLE dyad, 6 bristles on each side of the OQ. Fovea: length 0.54, width 1.08. Eyes, diameters and interdistances: AME 0.12 (small), ALE 0.24, PME 0.12, PLE 0.20, OQ 0.64 length, anterior width 1.68, 1.52 posterior width; AME-ALE 0.44, PME-PLE 0.04, AME-PME 0.24, ALE-PLE 0.28, AME-AME 0.24. Chelicerae: length 4.44, width 2.76; cheliceral apex with 12 recumbent and elongated bristles that cover the base of the fang. Cheliceral prolongation without cusps; furrow with 5 large promarginal teeth and 5 retromarginal and 4 denticles, near the promarginal teeth. Labium: length 0.76, width 0.68. Maxillae: anterior length 0.78, posterior length 1.32, width 0.96. Sternum (fig. 34G): Center flat; length 2.44, maximum width 2.16, minimum width 0.72. Postlabial sigillum shallow, posterior sigilla well defined and shallow. Abdomen: length 3.96, small with dark bristles and 3 spiniform dorsal bristles. PMS: length 0.40; PLS: length of basal:medial:apical segments 0.56:0.28:0.16. Spigots: 1 large, 9 small on PMS; PLS, numbers of large(small) spigots on basal:medial:apical article 2(18): 2(22):3(26). Lengths of legs and palp: I: 3.18, 1.38, 1.98, 2.52, 1.80, 10.86. II: 3.00, 1.38, 2.04, 2.58, 1.80, 10.80. III: 2.40, 1.38, 1.56, 2.70, 1.92, 9.96. IV: 3.30, 1.50, 2.70, 3.00, 2.10, 12.60. Palp: 3.12, 1.50, 3.00, –, 0.66, 8.28.

Chaetotaxy: Femora: I-II-IV, 0; III, 1 D A (small). Patellae: I-II, 0; III, 34 P SUP-D ANT, +10 on the margin, 1-1-1-1 D (3:4 B), 7 R A +8 on the margin; IV, 55 P SUP-D ANT +2 near the edge, 1/0 D B. Tibiae: I, 1-1-2 V ANT, 1-2-1-1-1 V POST, 1-1 R INF; II, 1 P A, 1-1-1-3-1-3-3-3 R, 2-1-1-2-1-2 V; III, 1-2 P, 1 D B, with a crown of 24 thorns and 2 apical (at the apex, anterior to the crown), 1-3-1 R, 1-1-1 V POST, 1-1-2 V ANT; IV, 1-2-1-1-2-1-2 P INF, 1/0 D A, 2-1-1-0-3 V. Metatarsi: I, 1-1-1-1-2 P INF (3:4 A), 2-1-1-2-2-1-3 R INF, 1-2-1-V (3:4 A); II, 1-2-1-2 P INF, 1-1-1-2-1-2-1-1-1-3 R INF, 2-2- 0-1-2-1-1 V (3:4 A); III, 1-1-1-3-2-2-2-5 row D POST-R, 1-1-1-2-2-3-1-1-2-3 row D ANT-P, 2-1-2- 2-1-1-3 V (3:4 A); IV, 1-1-2-1-1-2-2-2-3 P, 1-2-2-3- 2-4 V. Tarsi: I, 1-1-1-1-1-2 P INF, 1-1-1-2-2-1-2-1-2-2-1-2-1-2 R INF, 1-0-1-1 V (1:2 A); II, 1-1-1-1 V, 1-1-1-1-1-1-2-2 P INF, 1-1-1-4-3- 3-3-2-4 R INF; III, 3-2-2-2-3-5-2 P INF, 1-1-1-2-4- 4-4-1-3-1-1-2 R INF, 1-1-2 V (1:2 A); IV, 1-1-2-2-1-1-3-3-4-2-3-4 P INF, 1-1-2-2-1-1-4 R INF, 1-1-1-2 V. Total number of retrolateral spines

on tibiae I and II (fig. 34C): 2 and 14 respectively. Palp: tibia short and thickened (width/length: 0.35±0.02) (fig. 34B). Bulb with well-developed ATA and BTA; embolus elongate, with a series of denticles at the base, without MRk. Pseudoscopula: Tarsi: I sparse (1:2 A); II sparse (3:4 A); III-IV, dense and uniform. Metatarsi: without pseudoscopula. Trichobothria: Tibiae: I 3-4; II 4-6; III 5-7; IV 6-6. Metatarsi: I-II 10; III 8; IV 5. Tarsi: I 7; II 8; III 7; IV 6. Color: Carapace reddish brown, darker cephalic region and chelicerae. Abdomen brown with small dorsal spots, booklungs with dark markings. Sternum, labium and maxillae yellowish brown. Legs like carapace with lighter tarsi. Palps with patellae-tibiae light. Spinnerets yellowish.

Paratype female (MACN-Ar 27111, figs. 35A– F): Total length: 21.96. Carapace (fig. 35A): length 6.72, width 7.80, 24 bristles on each posterior margin. Cephalic region: length 4.02, width 6.18; clypeus with 30 small bristles, one larger central one; chilum with 40 bristles, 3 between AME-ALE, 37 bristles between PME and 21 behind each PME- PLE dyad; 12–14 small bristles on each side of the OQ. Fovea: length 0.84, width 0.96. Eyes, diameters and interdistances: AME 0.16, ALE 0.40, PME 0.20, PLE 0.32, OQ length 1.32, anterior width 3.72, 3.40 posterior width; AME-ALE 1.16, PME-PLE 0.20, AME-PME 0.76, ALE-PLE 0.76, AME-AME 0.36. Chelicerae: Length 4.44; width 2.76, with lighter bands where are the dorsal internal bristles; chelicerae apex with 17 recumbent and elongated bristles covering the base of the fang; dorsal anterior region with surface grooves. Rastellum with 17 marginal, blunt cusps, and 18 small dorsal ones. Fangs groove with 8 promarginal teeth (4 long and 4 small interleaved, starting on a large), 7 retromarginal ones, and 10 denticles in the furrow, near the promargin. Labium: length 1.68, width 1.50, with 40 anterior cuspules. Maxillae: anterior length 2.10, posterior length 3.00, width 1.98, with +130 cuspules 1:3 V ANT, extending to the anterior face. Sternum (fig. 35F): Center flat; length 5.1, maximum width 4.38, minimum width 1.62. Postlabial sigillum shallow, posterior sigilla shallow and well defined. Abdomen: length 10.80, globose, covered with small bristles. PMS: length 0.52; PLS: length of basal:medial:apical segments 0.92:0.40:0.24. Spigots: 2/3 large, 30 small on PMS; PLS, numbers of large(small) spigots on basal:medial:apical article 5/7(45):7(35):3(45). Lengths of legs and palp: I: 4.02, 2.82, 1.86, 2.40, 1.20, 12.30. II: 4.02, 2.82, 1.86, 2.70, 1.20, 12.60. III: 4.08, 3.30, 1.50, 3.06, 1.14, 13.08. IV: 5.10, 3.54, 3.06, 3.06, 1.14, 15.90. Palp: 3.90, 2.70, 2.88, –, 3.00, 12.48.

Chaetotaxy: All femora: 0. Patellae: I-II, 0; III, 42 R A, 25 P A, 31 on the margin; IV, 123 P SUP-D ANT; Palp, 1 V POST, 6 P (serial). Tibia: I, 12 P, 36 R INF, 1-1 V POST; II, 1 P A, 125 R (3:4 A), 1-1 V POST; III, 2-5 P (1:2 A), 1 D B, with a crown of 30 thorns and 12 apical (at the apex, anterior to the crown), 108 R (3:4 A); IV, 2/1-2-1 P; palp, 14 P (serial), 36 R INF, 1-1 V POST. Metatarsi: I, 27 P INF, 30 R INF, 1-1-2 V POST; II, 24 P INF, 30 R INF, 1-1-2 V POST; III, 90 row D POST-R (more abundant R A), 20 D ANT, 45 D B (small, divided in two fields of 16-19 by a glabrous band), 3 V A; IV, 26 P, 1 D ANT A, 2 V A. Tarsi: I, 16 P INF, 20 R INF, 2 V A; II, 19 P INF, 18 R INF, 1-2 VA; III, 67 R, 90 V-P; IV, 80 V-P; palp, 27 P INF, 36 R INF, 2 V A. Total number of retrolateral spines on tibiae I and II (fig. 35B): 36 and 125 respectively. Trichobothria: Tibiae: I 4-5; II 5-6; III 6-6; IV 7-8. Metatarsi: I 14; II 15; III 12; IV 8. Tarsi: I 12; II 14; III 11; IV 9. Color: Carapace reddish brown, with a clear spot in the center of the OQ. Chelicerae reddish brown with clearer dorsal bands. Abdomen brown, booklungs with dark markings (fig. 35C). Sternum yellowish, labium and maxillary reddish brown. Legs like carapace. Spinnerets yellowish.

DISTRIBUTION: Provinces of Córdoba, south of Buenos Aires, Santa Fe, and Corrientes.

OTHER MATERIAL EXAMINED: Córdoba. Bosque Alegre [31°35′ S 64°32′ W], Oct. 1981, P. Goloboff, 1♀ (MACN-Ar 36556). Cabana [31°13′ S 64°21′ W], Jul. 1945, Birabén, 1♀ (MACN-Ar 36557) GoogleMaps   ; same data and collector, 1♀ (with 45 offspring) (MACN-Ar 36558). Villa Carlos Paz [31°25′ S 64°29′ W], Jan. 1981, P. Grosso, A. Zanetti, and P. Goloboff, 1♂ (MACN-Ar 36559). Departamento Punilla [31°25′ S 64°37′ W], Jan. 1967, Muller , 1♂ (MACN-Ar 36560). La Falda [31°5′ S 64°28′ W], Mar. 1951, Viana , 1♂ (MACN-Ar 36561). Villa Rumipal (near the lake) [32°10′ S 64°29′ W], Jan. 2012, M. Izquierdo coll., 1♂ (MACN-Ar 31205). Arias [33°38′ S 62°24 W], 27 Nov. 2013, C. Corbella, 1♀ (MACN-Ar 36562). Buenos Aires. Sur de La China, 25 km O de Olavarría [36°57′ S 60°35′ W], 19–20 Mar. 1959, E. Maury, 1♀ (MACN-Ar 36563). Santa Fé. Recreo, Dpto La Capital [31°29′ S 60°43′ W], Jan. 1959, G. Achenbach, 8♀ ( MFA-ZI 1283). 2nd week Jan. 1948, same data and collector, 1♂ ( MFA-ZI 234, identified as “ A. rufipes (Lucas 1834)   by B. Gerschman de Pikelin and R. Schiapelli). Feb. 1945, same data and collector, 1♀ ( MFA-ZI 231, identified as A. crassipes (Keyserling, 1891)   by R. Schiapelli and B. Gerschman de Pikelin ). 2nd week Dec. 1948, same data and collector, 1♂ ( MFA-ZI 233). Santa Clara de Buena Vista , Dpto. Las Colonias [31°45′ S 61°19′ W], Mar. 2008, R. Milesi, 1♂ ( MFA-ZI 1346). Dpto La Capital [31°40′ S 60°45′ W], 28 Mar. 2011, J. Colombo, 1♂ ( MFA-ZI 1449). Same data, 24 Dec. 1948, G. Achenbach, 1♂ ( MFA-ZI 239, identified as A. rufipes (Lucas 1834)   by R. Schiapelli and B. Gerschman de Pikelin). Same data, 8 Apr. 1984, no collector, 1♀ ( MFA-ZI 625, identified as A. crassipes (Keyserling, 1891))   . Same data, Oct. 1995, no collector, 1W ♀ ( MFA-ZI 1031, identified as A. crassipes (Keyserling, 1891))   [31° 37′ S 60° 42′ W]. Santo Tomé, Dpto. La Capital [31°37′ S 60°42′ W], 27 Nov. 2007, D. Rovano, 1♀ ( MFA-ZI 1332 identified as A. crassipes (Keyserling, 1891))   . Santa Fé, 10 Sep. 1951, no collector, 1♀ ( MFA-ZI 683). Rafaela [31°16′ S 61°29′ W], Apr. 1976, A. M Luchetti, 1♀ (MACN-Ar 38286). Vera [29°28′ S 60°13′ W], no data, 1♀ (MACN-Ar 38195). Catamarca: La Cébila [28° 43′ S 66° 22′ W], 27–28 Jan. 1987, C. Szumik and P. Goloboff, 3♀ (MACN-Ar 27105) GoogleMaps   .

COMMENTS: The male and female with catalog number MACN-27117 probably belong to this species; they do not have any collection data. They have similar spermathecae, foveas, and sternums; the male is lacking the copulatory bulbs. Specimens from Entre Ríos (listed below) are tentatively assigned to this species; their morphology and spermathecae are similar. Confirmation of this awaits the collecting of males from Entre Ríos.

SPECIMENS EXAMINED: Entre Ríos. Villa Urquiza , [31°38′ S 60°23′ W], 17 Jan. 1988, P. Goloboff and C. Szumik, 1♀ (MACN-Ar. 27112). Arroyo Perucho Verna [32°9′ S 58°15′ W], 1981, A. Zanetic and P. Goloboff, 1♀ (MACN-Ar 28418). Ruta 14 y Arroyo Gualeyán [32°57′ S 58°34′ W], 27 Sep. 1987, P. Goloboff and C. Szumik, 2♀, 2 immature (MACN-Ar 36581) GoogleMaps   ; same locality, Oct. 1987, P. Goloboff and C. Szumik, 1♀ (MACN-Ar 27114). Paraná [31°42′ S 60°30′ W], 8–10 Feb. 1980, P. Grosso and P. Goloboff, 1♀ (MACN-Ar 27108) GoogleMaps   .

R

Departamento de Geologia, Universidad de Chile