Coriaceolamprodes, Anisyutkin, 2019

Anisyutkin, L. N., 2019, New genus and species of cockroaches, Coriaceolamprodes rubidusgen. et sp. nov. (Dictyoptera: Blaberidae: Epilamprinae), from the island of Borneo (Sarawak), Zoosystematica Rossica (China) 28 (2), pp. 317-322 : 318-321

Genus Coriaceolamprodes gen. nov.

Type species Coriaceolamprodes rubidus sp. nov.

Description. Uniformly dark coloured. Male with tegmina and wings completely developed, surpassing abdominal apex. Tegmina in proximal part strongly sclerotised, with subobsolete venation (veins partly replaced with rows of punctures); venation in distal part of tegmina distinct. Legs short; femora and tibiae distinctly flattened; tibial spines well developed. Fore tibiae distally thickened ( Fig. 3). Structure of hind tarsi ( Fig. 4): metatarsus slightly longer than other tarsal segments combined, and with two unequal rows of spines along lower margin [complete exterior row ( Fig. 4, e.r.) having 13–17 spines, and incomplete interior row ( Fig. 4, i.r.) having six to seven spines and displaced on lateral side of metatarsus]; 1st– 4th segments with small (as compared with metatarsus length) apical euplantula on first segment, with comparatively large euplantulae on 2nd–4th segments, and with a pair of “additional spines” (one inside and one outside) bordering each euplantula on 1st–3rd segments, and without other spines on 2nd–4th segments ( Figs 4, a.s.); claws symmetrical, simple; arolium distinct, about half as long as claw. Fore and mid tarsi similar to hind ones, but with following differences: they shorter; fore tarsi lacking spines; mid tarsi having single short row of five spines along lower margin of metatarsus; and “additional spines” on their 4th segment sometimes absent. Abdomen without visible glandular specialisations. Spiracles of VIII abdominal tergite located on apices of attenuate posterolateral angles ( Fig. 5). Anal plate transverse ( Fig. 5). Paraprocts of blaberid-type ( Fig. 6). Hypandrium nearly symmetrical, with caudal margin very widely rounded and lacking median incision; styli long, cylindrical and well sclerotised ( Fig. 7).

Male genitalia ( Figs 8–14). Right phallomere ( R +N) with caudal part well sclerotised and subrectangular in shape ( Figs 8, 9, c.p. R 1T), and with cranial part of R 1 T and R 2 widely rounded; R 3 elongated, with branches of unequal length; R 4 weakly sclerotised; R 5 in shape of long sclerotised strip, fused with sclerite R 2; bristles absent. Sclerite L2D (L1) not divided into basal and apical parts, rod-like, very weakly widened cranially ( Fig. 10), curved caudally, and with membranous lobe at apex; bristles absent ( Fig. 11). Sclerite L3 (L2d) short ( Figs 12–14); basal subsclerite developed, ring-like ( Figs 12, 13, b.L 3); “folded structure” absent; apex of sclerite in shape of pressbutton, not hook-like. Sclerite L4U (L3d) distinct, in shape of curved plate ( Fig. 12).

Differential diagnosis. Based on the complex of somatic (shape of pronotum, fore femora, tarsi, anal plate and hypandrium) and genital (right phallomere) morphological structures ( Princis, 1960; McKittrick, 1964), the genus Coriaceolamprodes gen. nov. belongs to the subfamily Epilamprinae . This genus is similar to the genera Calolamprodes Bey-Bienko, 1969 , Pseudocalolampra Roth et Princis, 1971 and Paracalolamprodes Anisyutkin, 2015 in the structure of both tarsi (all their tarsi with two unequal rows of spines along lower margin of tarsal segments; Fig. 4) and right phallomere (sclerite R 3 elongated, sclerite R 4 weakly sclerotised and fused with caudal part of R 1 T; Figs 8, 9).

The new genus clearly differs from these genera in the following characters:

– from Calolamprodes , in nearly symmetric hypandrium, more sclerotised caudal part of sclerite R 1 T, R 5 fused with R 2, absence of bristles on right phallomere, undivided L2D, and shape of L3 [compare Figs 7, 8–14 with figures in Anisyutkin, 1999 (figs 18–33, 37), 2006 (figs 6, 12, 14, 15–41)];

– from Pseudocalolampra , in the structure of paraprocts (in the latter genus, both paraprocts with hook-shaped caudomedial process), nearly symmetric hypandrium, shape of sclerites R 1 T, R 2 and R 5, undivided L2D, and shape of L3 [compare Figs 6, 7, 8–14 with figures in Anisyutkin, 2018 (figs 74–86)];

– from Paracalolamprodes , in completely developed tegmina and wings of male, nearly symmetric hypandrium, shape of sclerite R 5, undivid- ed L2D, and shape of L3 [compare Figs 7, 8–14 with figures in Anisyutkin, 2015 (figs 7–15)].

Included species. Type species only.

Etymology. The new name is derived from the Latin adjective coriaceus (leathery) and the part of the taxonomic name Calolamprodes . Gender is masculine.

Note. The shape of sclerite L3 ( Figs 12–14) of the male genitalia of Coriaceolamprodes gen. nov. is unique for Epilamprinae . This sclerite is not hook-like, as usual in cockroaches, but it rath- er has the shape of a pressbutton. The reduction of L3 is reported for some Panesthiinae ( Roth, 1977) . At least many representatives of Panesthiinae have a reclusive habit of life in decaying logs or straight-through burrows ( Roth, 1977). Some morphological features of C. rubidus sp. nov. may indicate a hidden mode of live: comparatively short legs and cerci, distally thickened fore tibiae, and sclerotised tegmina. Perhaps this explains the features of the structure of sclerite L3. The peculiarity of this structure is probably reflects a specialised type of copulation. Unfortunately, at the present time nothing is known about the habit of life of this species.