Histeromorphus carinatus, Purchart, 2014

Purchart, Luboš, 2014, Revision of the genus Histeromorphus (Coleoptera: Tenebrionidae) from the Socotra Archipelago with descriptions of three new species *, Acta Entomologica Musei Nationalis Pragae 54, pp. 211-230 : 215-216

Histeromorphus carinatus sp. nov.

( Figs 1 , 7, 13, 19 , 28–31, 52, 53)

Type locality. Yemen, Socotra Archipelago, Socotra Island, sand dune east of Suq, ca. 12°40ʹ02ʺN, 54°03ʹ45ʺE, 20–170 m a.s.l.

Type material. HOLOTYPE: J ( NMPC): Yemen: Soqotra Is., 22.xi.2003, SUQ, E env. - sand dune, N 12°40ʹ02ʺ E 54°03ʹ45ʺ, 20-170 m [GPS]; Jan Farkač lgt. // YEMEN - SOQOTRA 2003, Expedition; Jan Farkač, Petr Kabátek & David Král . PARATYPES: 1 spec. ( CULS): same data as holotype ; 1 spec. ( NMPC), 1 J ( LPCB): Yemen, Soqotra Is., GUBBAH vill.env., 23.xi.2003, N 12°36ʹ35ʺ E 53°46ʹ56ʺ, 7 m [GPS], leg. P. Kabátek // YEMEN - SOQOTRA 2003, Expedition ; Jan Farkač , Petr Kabátek & David Král ; 1 ♀ ( MCSC): YEMEN, Socotra Isl. , Hadibo, N12°39ʹ41.38ʺ, E054°03ʹ19.50ʺ, 5.ii.2008, F. Pella lgt .

Description. Body length 7.1–8.3 mm (holotype 7.1 mm). Body width 5.0–6.2 mm (holotype 5.0 mm). Black, dull, glabrous. Body broad, oval ( Fig. 1 ).

Head smooth, entire surface densely and roughly punctate ( Fig. 7 ). Anterior margin of clypeus slightly sinuate; entire clypeus finely punctate; frontoclypeal suture slightly indicated laterally.

Pronotum broadest at base, entire surface finely punctate. Sides of pronotum rounded, regularly dilated towards pronotal base. Anterior corners nearly rectangular. Posterior corners obtuse-angled.

Elytra. Elytral surface glabrous, smooth, very sparsely and very finely shallowly punctate. Pseudopleura well separated from elytra by fine and complete pseudopleural margin running in its entire length along edge of elytra ( Fig. 19 ).

Ventral part. Prosternum glabrous, smooth, impunctate. Prosternal apophysis as broad as procoxae, widened apically. Mesoventrite glabrous, smooth, longer (in ventral view) than coxae. Metaventrite glabrous, smooth, as long (in ventral view) as coxae. Abdominal ventrites glabrous, smooth, impunctate.

Legs. Profemur distinctly claviform ( Fig. 13 ), anterior margin on ventral side strongly impressed, forming distinctly keeled sharp carina-like edge running along entire length of anterior margin, entire posterior margin on dorsal part with row of long yellow setae.

Male genitalia. Aedeagus simple (Figs 28–31). Apical piece of tegmen subparallel, rapidly narrowing at apex, with long opening on ventral side; base of apical piece straight, without teeth. Basal piece widened towards base. Median lobe straight in basal 2/3 and strongly curved upwards (in lateral view) in apical third.

Female genitalia. See Figs 52, 53.

Differential diagnosis. Histeromorphus carinatus sp. nov. can be easily differentiated from all other species by the fine and complete pseudopleural margin which is visible along the edge of elytra. In other species, the pseudopleural margin is incomplete and below the rounded side of elytra (when viewed from behind) starting at the humeral angles and running obliquely downwards towards the apex of elytra ( H. nogedensis sp. nov., H. plicatipennis and H. plicatus ) or, if complete ( H. undatus and H. convexicostatus sp. nov.), it is strongly developed, nearly costate. Furthermore, the new species can be distinguished by its slightly sinuate clypeal margin and, with the exception of H. nogedensis sp. nov., by the ventrally keeled anterior margin of the profemur, row of long yellow setae along the posterior dorsal margin of profemur, and by strongly curved and almost rectangular (in lateral view) median lobe. It further differs from H. undatus and H. convexicostatus sp. nov. in the smooth elytra (transversally plicate in H. undatus and with straight concave interstriae in H. convexicostatus sp. nov.).

Distribution. So far known only from three localities on the sandy northern coast of Socotra Island.

Etymology. Refers to carinate (keel-like) anterior edge of posterior femur; adjective.

Figures

Figs 1–6. Habitus of Histeromorphus in dorsal view. 1 – H. carinatus sp. nov., holotype; 2 – H. convexicostatus sp. nov., holotype; 3 – H. nogedensis sp. nov., holotype; 4 – H. plicatipennis Waterhouse, 1881; 5 – H. plicatus Kraatz, 1865; 6 – H. undatus Gahan, 1900. Scale bar = 5 mm.

Figs 7–27. 7–12 – head in dorsal view. 13–18 – profemur in ventral view; white arrows indicate keeled anterior margin. 19–24 – pseudopleural margin in lateral view; ee – edge of elytra; pem – pseudopleural margin. 25–27 – elytral surface variability. 7, 13, 19 – Histeromorphus carinatus sp. nov., holotype; 8, 14, 20 – H. convexicostatus sp. nov., holotype; 9, 15, 21 – H. nogedensis sp. nov., holotype; 10, 16, 22 – H. plicatipennis Waterhouse, 1881; 11, 17, 23, 25–27 – H. plicatus Kraatz, 1865; 12, 18, 24 – H. undatus Gahan, 1900.