Hylaperdina squamosa, Arriaga-Varela, Emmanuel & Tomaszewska, Wioletta, 2016

Arriaga-Varela, Emmanuel & Tomaszewska, Wioletta, 2016, Hylaperdina squamosa, a new species of Neotropical Lycoperdininae (Coleoptera, Endomychidae) from Brazil, Zootaxa 4161 (4), pp. 567-572 : 568-570

Hylaperdina squamosa sp. nov.

( Figs 1–14 )

Etymology. The name of the new species is derived from the Latin adjective squamosus, which means scaly or “covered with scales,” referring to the scale-like microsculpture of the mesoventrite.

Diagnosis. Hylaperdina squamosa can be differentiated from its congeners by its larger body, antennomere 5 only scarcely widened (only slightly wider than neighbouring antennomeres 4 or 6) and scaly microsculpture on the mesoventrite and much larger pits on the prosternum and mesoventrite with diameter of the pit on prosternum about 0.30× the width of procoxa (0.12× in H. costariciensis and 0.17× in H. brevicornis ) and diameter of lateral pit on mesoventrite 0.45× the width of mesocoxa (0.30× in H. costariciensis and H. brevicornis ). Additionally, H. squamosa can be easily distinguished from H. brevicornis by the following characters: longer antenna with 3rd antennomere 1.25× longer than wide and 5th antennomere subequal to 6th (3rd antennomere 0.8× as long as wide, and 5th antennomere conspicuously wider than 6th in H. brevicornis ), the pronotum with more distinctly developed lateral sulci and the pronotum, and elytra more sparsely punctate. Hylaperdina squamosa is most similar to H. costariciensis ; however, it can be easily distinguished from H. costariciensis by having the scaly microsculpture on the mesoventrite and the antenna with shorter antennomeres, with the terminal antennomere nearly as long as wide (about 1.4× as long as wide in H. costariciensis ).

Description. Length 3.37–3.41 mm, width 1.52–1.58 mm, height 1.10 mm; body elongate-oval, weakly convex ( Figs 1–3 , 6 ), 2.14–2.21× as long as wide, 3.02× as long as high; moderately shiny; reddish brown; densely covered with long, suberect golden pubescence.

Head with eyes moderately large ( Fig. 8 ); interocular distance 0.8× as wide as head including eyes. Antenna with 11 antennomeres, rather long and stout ( Fig. 7 ), 0.37× as long as body; scape 1.57× as long as wide, 1.62× as long as pedicel; pedicel 1.03× as long as wide; 3rd antennomere as long as pedicel, 1.25× as long as wide; 4th antennomere 0.87× as long as wide, 0.67× as long as pedicel; 5th and 6th antennomeres each 0.85× as long as wide, 0.72× as long as pedicel; 7th antennomere 0.75× as long as wide, 0.77× as long as pedicel, 1.24× and 1.05× wider than 6th and 8th antennomeres respectively; 8th antennomere 0.77× as long as wide, 0.75× as long as pedicel; antennal club 0.4× as long as total antennal length; 9th antennomere slightly asymmetrical, 0.63× as long as wide, 1.25× as long as pedicel, 10th antennomere strongly asymmetrical, 0.59× as long as wide, 1.32× as long as pedicel; terminal antennomere nearly as long as wide, somewhat oval in shape, asymmetrical, 1.20× as long as wide, 2.40× as long as pedicel.

Pronotum weakly transverse ( Fig. 9 ), 0.60× as long as wide, 1.47× as wide as head, widest at basal half, moderately convex; front angles weakly produced, rounded; lateral margins subparallel at basal two thirds; lateral carina narrow, coarsely and unevenly crenulate; hind angles acute; lateral sulci very deep, basal foveae reniform, rather large; pronotal surface with foveate setiferous punctures getting larger and denser posteriorly; punctures near anterior margin 1–3 diameters apart, punctures near posterior margin twice as large at those near anterior margin, 0.20–0.70 diameters apart. Prosternum ( Fig. 10 ) with pair of large, internally setose pits laterally, pit diameter about 0.30× the width of procoxa.

Elytra together 2.21–2.24 mm long, 1.41–1.46× as long as wide; 2.90–3.00× as long as and 1.27× as wide as pronotum; wider near mid-length and converging to rounded apex. Elytral surface ( Fig. 11 ) covered with foveate setiferous punctures 1–3 diameters apart at anterior third, becoming smaller and sparser posteriorly. Mesoventrite ( Figs 12–13 ) with very large, internally setose, anterolateral pits, width of pit about 0.65× width of mesocoxa; mesoventral surface with squamose microsculpture; median ridge sharp and raised medially; mesointercoxal process comparatively narrow, about 0.33× as wide as mesocoxal diameter. Metaventrite with two pairs of large, internally setose postcoxal pits ( Fig. 14 ); width of lateral pit about 0.45× width of mesocoxa.

Legs moderately long and slender. Metatibia 0.40× as long as elytra; metatarsus 0.62× as long as metatibia. Abdomen ( Fig. 5 ) with ventrite 1 nearly as long as four following ventrites combined, without patch of short setae medially, with rather large postcoxal pits, larger compared to other Hylaperdina species. Female genitalia ( Fig. 4 ) with ovipositor moderately sclerotized, with coxites well developed, separated, densely setose at apex; styli distinct, terminal. Spermatheca small, rounded, membranous; accessory gland minute, rounded, membranous; bursa copulatrix elongate.

Male not known.

Type material. Holotype female: SÃO PAULO, BRAS . MRÁZ LGT, MUS. PRAGENSE / HOLOTYPE, Hylaperdina squamosa sp. nov., Arriaga-Varela & Tomaszewska des. 2016 [red label] ( NMPC) . Paratype female: (same data as holotype) / PARATYPE, Hylaperdina squamosa sp. nov., Arriaga-Varela & Tomaszewska des. 2016 [red label] (MIZ). Note. The paratype shows asymmetrical development of the pronotum ( Fig. 9 ), probably of teratological origin. The left edge is shrunk to 70% of the normal length.

Distribution. Neotropical Region: Brazil, São Paulo State.

Figures

FIGURES 1 – 5. Hylaperdina squamosa sp. nov. 1. Dorsal habitus. 2. Ventral habitus. 3. Lateral habitus. 4. Female genitalia 5. Abdomen, ventral view.

FIGURES 6 – 10. Hylaperdina squamosa sp. nov. 6. Ventral habitus. 7. Antenna, dorsal view. 8. Head, dorsal view. 9. Pronotum, dorsal view. 10. Prosternum and procoxae.

FIGURES 11 – 14. Hylaperdina squamosa sp. nov. 11. Elytral surface of anterior half. 12. Mesoventrite, ventrolateral view. 13. Mesoventrite, ventral view. 14. Mesocoxa and anterolateral corner of metaventrite.