Holophloeus loebli Trýzna & Baňař, 2020

Trýzna, Miloš & Baňař, Petr, 2020, A new species of Holophloeus Jordan (Coleoptera: Anthribidae) from eastern Madagascar with ecological notes on it and H. tuberosus (Fairmaire, 1897), Zootaxa 4732 (1), pp. 79-98 : 82-87

Holophloeus loebli Trýzna & Baňař sp. nov.

( Figs. 4 , 6–10 , 16, 18 , 20, 22 , 24, 26, 28 , 34–42 )

Type locality. East Madagascar, Toamasina province, Mantadia National Park , S 18°48´05.8´´, E 48°25´44.9´´, 993 m.

Type material. Holotype (male): MADAGASCAR: TOAMASINA PROVINCE:

‘E MADAGASCAR, 30. XII. / 2016, MANTADIA N. P., 993 M, “EULOPHIA CIRCUIT “, / S 18°48´05.8´´, E 48°25´44.9´´, / MILOŠ TRÝZNA LEG. ’ [p] ( BSNPC). Allotype (female): the same data as holotype ( MTDC). Paratypes (40 males, 48 females) : 23 males, 20 females: the same data as holotype ( MTDC, 3 pairs in MMBC, 1 pair each in BMNH, CMNC, MNHN, MTD, NMPC and ZSMC) ; 11 males, 18 females: the same data as holotype but 17.-22.i.2017 ( MTDC) ; 2 females: ‘E MADAGASCAR, 5.-13.ii. / 2007, Andasibe N.P., 955 m, / “Analamazaotra forest”, / S 18°56´45.0´´, E 48°25´08.0´´, / Miloš Trýzna leg.’ [p] ( MTDC) ; 1 male: ‘E MADAGASCAR, 5.ii.2016, / Andasibe N.P., “ Analamazaotra / forest”, circuit Indri 1, / 979 m, S 18°56´16.8´´, / E 48°25´09.1´´, M. Trýzna leg.’ [p] ( MTDC) ; 1 female: ‘MADAGASCAR, 947 m, / Andasibe N.P., 22.-29.i.2019, / Analamazaotra , Aventure circ., / S 18°56´40.6´´, E 48°25´26.7´´, / primary forest, M. Trýzna leg.’ [p] ( MTDC) ; 1 female: ‘MADAGASKAR c. / MORAMANGA env. / 10.-18.xii.1997 / P. Pacholátko lgt.’ [p] // ‘ Holophloeus / tuberculosus (Sic!) / Fairm. [h] /det. R. Frieser [p] 2007 [h]’ // ‘CUM TYPO / COMPARATUM’ [red printed, a typical label used by Frieser] ( MTDC) ; 1 male, 2 females: ‘ Madagascar / Antsianaka [= forest Antsianaka near Lac Alaotra] / Perrot Frères / 2 e Semestre 1893 [p]’ // ‘ Muséum Paris / ex. Coll. / R. Oberthür / 1952’ [p, typical blue acquisition label of MNHN] (1 pair in MNHN, 1 female in MTDC) ; 1 female: ‘ Madagascar / Fénerive / E. Perrot [p] // Muséum Paris / ex. Coll. / R. Oberthür / 1952’ [p, typical blue acquisition label of MNHN] ( MNHN) ; 2 males: ‘Madagascar / Fénerive / Per- rot Frères, 1 er Trim. 1896’ [p] // ‘Muséum Paris / ex. Coll. / R. Oberthür / 1952’ [p, typical blue acquisition label of MNHN] (1 ex. in MNHN, 1 ex. in MTDC) ; 1 female: FIANARANTSOA PROVINCE: ‘ MADAGASKAR / Ranomafana res. [= Ranomafana National Park] / 15.-25. xii. 2004 / R. Andreeva, I. Andreev leg.’ [p] ( MTDC) ; 1 male, 1 female: ‘ MADAGASCAR, 1000 m / Ranomafana N.P., circuit / Talatakely , 8.-12.i.2019, / S 21°15´47.2´´, E 47°25´20.7´´, / primary forest, M. Trýzna leg.’ [p] ( MTDC) ; 1 male, 1 female: ‘Madagascar’ [p] ( MNHN) .

Red label [p]: ‘ HOLOTYPE / ALLOTYPE / PARATYPE / Holophloeus / loebli sp. nov. / M. Trýzna & P. Baňař det., 2018 (resp. 2019)’.

Description. Male holotype (female allotype). Measurements (in mm): Total body length—8.82 (8.00). Head: total length—1.96 (1.80), length of rostrum—1.29 (1.12), maximum width of rostrum—1.04 (1.12), length of eye— 0.67 (0.68), maximum width across eyes—1.49 (1.52), minimum distance between eyes—0.56 (0.60). Antenna: length of segments: II—0.33 (0.28), III—0.71 (0.45), IV—0.69 (0.45), V—0.62 (0.35), VI—0.67 (0.28), VII—0.53 (0.25), VIII—0.44 (0.20), IX—0.33 (0.28), X—0.22 (0.18), XI—0.38 (0.28), width of segment IX—0.28 (0.25). Pronotum: maximum length—2.09 (1.88), maximum width—2.73 (2.72), minimum width—1.33 (1.44). Elytra: maximum length—4.45 (4.08), maximum width—3.31 (3.32).

Coloration of the cuticle black, only tarsomeres III–IV in all legs dark brown, claws slightly lighter. Proximal and distal part of tarsomere I and proximal part of tarsomere II covered with dense whitish hairs ( Fig. 4 ).

Vestiture. Head naked, pronotum covered with very fine sparse indistinct appressed blackish setae, on lateral sides of pronotum and on prosternum setae whitish. Elytra, including all tubercles covered with very short fine sparse appressed blackish setae. Antennae with short fine appressed setae, antennomeres VIII–XI in addition with several long hairs on distal part. All legs covered with fine setae, all femora with indistinct light sparse appressed setae particularly in distal part, all tibiae with dense black setae, appressed on external part and distinctly subdecumbent in internal part. All tarsomeres covered with decumbent dense black setae, proximal and distal part of tarsomere I and proximal part of tarsomere II also covered with dense whitish decumbent hairs. Venter of thorax and abdominal sternites with very short sparse whitish pubescence. Pygidium covered with very fine appressed dark setae.

Structure. Head relatively long, rostrum broad ( Figs. 4 , 20 ), flat in middle, with indistinct depression between antennal scrobes, with distinct longitudinal carina in central part of rostrum. Dorsal part of rostrum and frons very strongly sculptured, this sculpturation also on lateral sides of rostrum. Ratio of rostrum length to maximum width 1.24 in male, 1.00 in female. Ventral part of head only with fine and sparse punctation ( Fig. 20 ). Eyes not emarginate anteriorly, dorsal ocular index 1.20 in male, 1.30 in female. Ratio of maximum width across eyes to maximum width of rostrum 1.43 in male, 1.36 in female. Antennae ( Fig. 4 ) of male distinctly extended to posterior margin of pronotum, antennae of females shorter, reaching approximately posterior margin of pronotum. Scape and pedicel thick, funicle thin, antennomeres IX–XI not forming compact club but slack and gradually extended in both sexes. Antennomere IX only slightly longer than wider in both sexes, X as long as wide in male, slightly transverse in female, XI slightly longer than wider in male, as long as wide in female. Pronotum transverse, ratio of its length to maximum width 0.77 in male, 0.69 in female, widest at distinct dorsal transverse carina, from which strongly narrowed anteriad and posteriad ( Fig. 16 ). Dorsal antebasal transverse carina with arch in middle, here shortly interrupted, continuously-undulate to sides and interrupted before lateral lobe. Lateral carina of pronotum short, in contact with dorsal transverse carina forming a distinct lobe. Basal longitudinal carinula of pronotum absent. Pronotal disc with one well-defined tubercle, surrounding area with shallow depressions. Elytra broadly suboval to rectangular ( Fig. 18 ), narrowed evenly in distal fifth of their length, ratio of the maximum length to maximum width of elytra 1.34 in male, 1.23 in female. Elytra with numerous well-defined tubercles on even-numbered elytral intervals: second elytral interval with three well-defined protruded subbasal, median and postmedian and one small preapical tubercles, fourth elytral interval with two well-defined antemedian and postmedian and one small preapical tubercles, sixth and eighth elytral intervals with numerous small tubercles ( Figs. 4 , 18 ). Abdomen shorter than broad. Ventrites II–V with prominent margins on proximal part in male ( Figs. 26, 28 ). Pygidium longer than wide in male, wider than long in female, slightly narrowing posteriorly.

Male genitalia and surrounding structures. Tegmen robust ( Fig. 6 ), tegminal plate wide, basal piece strongly, tegminal apodeme weakly sclerotized. Apex of tegmen conspicuously broadened. Aedeagus long and robust ( Fig. 7 ), its inner sac ( Fig. 8 ) with several symmetrical and asymmetrical densely serrated structures. Pedon sub-rectangular in shape, with short and strongly sclerotized apical projection. Tectum with very long process, longer than apex of pedon ( Figs. 7, 10 ). Tergite VIII strongly sclerotized, with two antero-lateral projections, sternite VIII ( Fig. 9 ) sub-divided into two kidney-shaped hemisternites. Sternite IX (= spiculum gastrale) with strongly sclerotized arms touching sternite VIII on its posterior margin ( Fig. 9 ).

Sexual dimorphism. Males: body comparatively more slender than in females, rostrum slightly longer and more slender. Antennae extended distinctly beyond posterior margin of pronotum, antennomere X as long as wide. Abdominal ventrites flat in middle, ventrites II–V with prominent margins on proximal part. Females: body more robust than in male. Antennae shorter, approximately reaching posterior margin of pronotum, antennomere X slightly transverse. Abdominal ventrites rounded.

Etymology. Patronym, dedicated to our dear colleague and friend Ivan Löbl (Geneva), eminent specialist in the field of the taxonomy of Coleoptera .

Collecting circumstances. The holotype, allotype and most of the paratypes were collected in tropical moist primary forest at an elevation of 993 metres on the lower side of a fallen tree trunk. The rotten trunk had a diameter about 50 cm and was located in a distinctly shaded area. Microhabitat of the type locality is on Figs. 37–41 . For details, see section on Ecological notes on Madagascan species of the genus Holophloeus .

Distribution. All specimens were collected in east Madagascar, in Toamasina and Fianarantsoa Provinces.

Differential diagnosis. Holophloeus loebli Trýzna & Baňař sp. nov. is similar to H. tuberosus ( Fairmaire, 1897) from which it can be distinguished by the morphological characters given in the following key:

(1) Specimens more robust, ratio of body length to maximum width 2.66 in male, 2.41 in female ( Fig. 4 ). Pronotum transverse ( Fig. 16 ), ratio of its length to width at carina 0.77 in male, 0.69 in female. Elytra suboval ( Fig. 18 ), ratio of the maximum length to maximum width of elytra 1.34 in male, 1.23 in female. Elytral tubercles robust, more prominent, in cross-section rather spherical. Subbasal, median and postmedian tubercles on the second elytral interval very prominent (see also from lateral view). Pronotal and elytral tubercles entirely black. Lateral carina of pronotum reaching one third of pronotal length. Prosternum and mesosternum with deep sparse microsculpture ( Figs. 22 , 24 ). Male abdominal ventrite V short and transverse ( Figs. 26, 28 ), ratio of its length to width 0.40, and distinctly wider than width of pygidium in apical view. Antennomere IX in male shorter, only 1.19x longer than wide ( Fig. 4 ). Male terminalia: tegminal plate wider and robust, its apex broadened ( Fig. 6 ). Tectum with very long process, longer than apex of pedon ( Figs. 7, 10 ). Sternite IX (= spiculum gastrale) touching sternite VIII at its posterior margin ( Fig. 9 ) .................................................... H. loebli Trýzna & Baňař sp. nov.

(2) Specimens more slender, ratio of body length to maximum width 2.98 in male, 2.70 in female ( Fig. 5 ). Pronotum slightly transverse ( Fig. 17 ), ratio of its length to width at carina 0.89 in male, 0.80 in female. Elytra suboval ( Fig. 19 ), ratio of the maximum length to maximum width of elytra 1.53 in male, 1.42 in female. Elytral tubercles smaller, less prominent, in cross-section suboval. Subbasal, median and postmedian tubercles on the second elytral interval not prominent (see also from lateral view). Pronotal and elytral tubercles each with apex brownish. Lateral carina of pronotum very short to almost lacking. Prosternum and mesosternum with shallow dense microsculpture ( Figs. 23 , 25 ). Male abdominal ventrite V weakly transverse ( Figs. 27, 29 ), ratio of its length to width 0.60, and slender, only slightly wider than width of pygidium in apical view. Antennomere IX in male longer, 1.44x longer than wide ( Fig. 5 ). Male terminalia: tegminal plate narrower, its apex thin, not broadened ( Fig. 11 ). Tectum strongly reduced, without process ( Figs. 12, 15 ). Sternite IX (= spiculum gastrale) touching sternite VIII in the middle of its length ( Fig. 14 )......................................................... H. tuberosus ( Fairmaire, 1897)

Figures

FIGURES 4–5. 4, Holophloeus loebli Trýzna & Baňař sp. nov., holotype, male; 5, Holophloeus tuberosus (Fairmaire, 1897), male from Mt. ďAmbre National Park.

FIGURES 6–15. Male terminalia. 6–10, Holophloeus loebli Trýzna & Baňař sp. nov., holotype male; 11–15, Holophloeus tuberosus (Fairmaire, 1897), male from Mt. ďAmbre National Park; 6, 11, tegmen, dorsal view; 7, 12, aedeagus, ventral view; 8, 13, inner sac of aedeagus, latero-ventral view; 9, 14, segment VIII and sternite IX, ventral view; 10, 15, apex of aedeagus, dorsal view. Red arrows indicate important details (see Key). Scale bars in mm.

FIGURES 16–19. 16, 18, Holophloeus loebli Trýzna & Baňař sp. nov., holotype, male; 17, 19, Holophloeus tuberosus (Fairmaire, 1897), male from Mt. ďAmbre National Park; 16–17, pronotum, dorsal view; 18–19, elytra, dorsal view.

FIGURES 20–23. 20, 22, Holophloeus loebli Trýzna & Baňař sp. nov., holotype, male; 21, 23, Holophloeus tuberosus (Fairmaire, 1897), male from Mt. ďAmbre National Park; 20–21, head, ventral view; 22–23, prosternum, dorsal view.

FIGURES 24–29. 24, 26, 28, Holophloeus loebli Trýzna & Baňař sp. nov., holotype, male; 25, 27, 29, Holophloeus tuberosus (Fairmaire, 1897), male from Mt. ďAmbre National Park; 24–25, mesosternum and metasternum, dorsal view; 26–27, abdominal ventrites I–V, dorsal view; 28–29, abdominal ventrite V, dorsal view.

FIGURES 34–35. Collecting site of Holophloeus loebli Trýzna & Baňař sp. nov. in Andasibe National Park, Analamazaotra forest, 2016.

FIGURES 36–37. Collecting site of Holophloeus loebli Trýzna & Baňař sp. nov.; 36, Andasibe National Park, Analamazaotra forest, 2016; 37, type locality in Mantadia National Park, Eulophia circuit, 2017.

FIGURES 38–39. Type locality of Holophloeus loebli Trýzna & Baňař sp. nov. in Mantadia National Park, Eulophia circuit, 2017; 38, primary forest with single huge torso of lying trunk; 39, detail of cover of bark with specimens.

FIGURES 40–41. Type locality of Holophloeus loebli Trýzna & Baňař sp. nov. in Mantadia National Park, Eulophia circuit, 2017, detail with specimen and exit hole.

FIGURE 42. Distribution of Holophloeus species in Madagascar.