Drylichus hylesinoides Heller, 1916

Kodada, Ján, Jäch, Manfred A. & Jr, Čiampor Fedor, 2009, Review of the genus Drylichus Heller (Insecta: Coleoptera: Dryopidae), Zootaxa 2157, pp. 43-58 : 52

Drylichus hylesinoides Heller, 1916

( Figs 1, 2–6, 8–9 , 11–21 , 30–38 )

Drylichus hylesinoides Heller, 1916: 284 .

Type locality: "Mt. Canala, 700 m ", New Caledonia.

Material examined: Holotype 3 ( SMTD): "Drs. F.Sarasin & J. Roux Neukaledonien Mt.Kanala [p]; [back side] cr. 700 m. 3. 11. 1911 [hw] / 1914 [p] 6 [hw] hylesinoides Heller [hw] Typus [p] / Drylichus I - 2 v hylesinoides Heller [hw] / Staatl. Museum fur Tierkunde Dresden". 1 Ƥ (QMM): " NEW CALEDONIA Mt Do summit 20 May 1984 G. Monteith & D. Cook / Q. M. BERLESATE No. 654 21. 45 S X 166. 0 0 E, Rainforest, 1000 m Litter".

Diagnosis: Drylichus hylesinoides is characterized by the large size, indistinct elytral striae, and by the shape and size of the aedeagus and the ovipositor.

Redescription: Habitus ( Fig. 1). Length (TL): 3 4.26 mm, Ƥ 4.37 mm; width (EW): 3 1.90 mm, Ƥ 1.97 mm. Head, pronotum and venter black; elytra dark brown; legs, mouthparts and antennal club reddish-brown. Diameter of macropunctures on head subequal to diameter of facet, macropunctures nearly confluent, interstices micropunctate; frons with narrow longitudinal mesal portion unpunctate. Head width: 3 1.09 mm, Ƥ 1.15 mm. Antenna 11-segmented. Mandible with three apical teeth. Pronotal macropunctures approximately 0.7 times as large as diameter of a facet, more dense laterally, interstices densely micropunctate, 1–3 times as wide as diameter of a facet, micropunctures not confluent; pronotum more or less parallel-sided in posterior half, arcuately convergent in anterior half; disc moderately convex; pronotal rim widest in posterior half; pronotal width (MW): 3 1.94 mm, Ƥ 1.90 mm; pronotal length (PL): 3 1.31 mm, Ƥ 1.34 mm. Prosternum densely and irregularly punctate on anterior half, nearly rugose laterally, with flat granules mainly posterolaterally, granules feebly smaller than facets, irregularly arranged; prosternal process with distinct longitudinal mesal keel. Hypomeron posteriorly wider than profemur, irregularly punctate and granulate. Mes- and metepisterna irregularly punctate, punctures intermixed with few scattered small granules; metaventrite as long as prosternal process, disc deeply impressed, finely punctate, sides raised; discrimen moderately raised posteriorly. Scutellum wider than long, subtriangular, lateral margins rounded. Elytra moderately convex, subovate, widest near middle, posterior third strongly declivous; sides moderately arcuate anteriorly, strongly arcuate posteriorly, lateral edge visible in dorsal view along anterior fourth and subapically; anterior margin finely irregularly crenulate; anterolateral angle nearly rectangular, protruding; each elytron with transverse depression near anterior margin; ratio of EL/EW: 1.54 (3), 1.57 (Ƥ); elytral disc rather irregularly and shallowly punctate, rugose, with dual punctation; macropunctures smaller than facets, irregularly arranged; striae very fine, indistinct. Midline lengths of ventrites 1–5: 0.71/0.35/0.19/0.20/ 0.72 mm (3), 0.65/0.39/0.33/0.27/ 0.80 mm (Ƥ); male ventrites irregularly punctate, rugose, except of abdominal intercoxal process, which is sparsely punctate, apex of ventrite 5 rounded; in female ventrites less rugose. Male sternite 8 with short anterior process ( Fig. 36 ); female sternite 8 as long as ovipositor, mesal process narrow ( Fig. 38 ). Aedeagus 1.69 mm long; phallobase 2.18 times as long as parameres, subcylindrical, asymmetric basally ( Fig. 30 ). Parameres widest basally, moderately inflected ventrad in apical half ( Fig. 32 ); ventroapical half with longitudinal stripes ( Fig. 34 ); apices rounded and flattened in lateral view. Penis feebly shorter than parameres, widest basally, gradually tapering to apex ( Fig. 31 ); apex narrow, subacute; anterolateral apophyses short and wide. Membranous ventral sac robust; surface with mosaic structure ( Fig. 33 ), meshes larger and more oblique basally; fibula distinct and strong. Ovipositor 2.13 mm long (ca. as long as abdomen), strongly sclerotized, posteroventral portion smooth; valvifer about 1.46 times as long as coxite ( Fig. 37 ); bursa copulatrix without sclerotized spinules.

Sexual dimorphism: Tibiae of male wider than in female, especially protibia strongly thickened in distal half (as wide as combined length of tarsomeres 1–3). Abdomen of male more rugose than in female.

Distribution: So far known from two localities in New Caledonia ( Fig. 48 ).

Habitat: Rainforest litter at higher elevations (700–1000 m a.s.l.).

Figures

FIGURE 48. Geographical distribution of the species of Drylichus. ․ D. hylesinoides; □ D. monteithi sp. nov.; • D. fidelitas sp. nov.

FIGURES 2 – 10. Drylichus Heller. 2 – 6, 8 – 9. Drylichus hylesinoides Heller, female. 7, 10. D. fidelitas sp. nov., female. 2) antenna, ventral view; 3) scape and pedicel, ventral view; 4) sensilla on anteromedian extension of antennomere 7; 5) sensilla on apex of terminal antennomere; 6) labrum, dorsal view; 7) labrum, dorsal view; 8) left mandible, dorsal view; 9) prostheca, dorsal view; 10) left mandible, mesal view.

FIGURES 11 – 19. Drylichus hylesinoides Heller, female. 11) maxilla, ventral view; 12) galea, ventral view; 13) lacinia, ventral view; 14) palpifer, lateroventral view; 15) sensilla on base of terminal palpomere of maxillary palpus, lateral view; 16) terminal palpomere of maxillary palpus, lateral view; 17) apex of maxillary palpus, frontolateral view; 18) anterior portion of labium, ventral view; 19) basal sensory field on terminal palpomere of labial palpus, frontolateral view.

FIGURES 20 – 29. Drylichus Heller. 20 – 21. Drylichus hylesinoides Heller, female. 22 – 29. D. fidelitas sp. nov., female. 20) apical sensory field on terminal palpomere of labial palpus, lateroventral view; 21 a) same, frontal view, b) sunken subapical sensillum, ventrolateral view; 22) head, lateral view; 23) eye, lateral view; 24) posterior leg, dorsal view; 25) same, apex of tibia and basal tarsomeres; 26) claws with empodium, ventrolateral view; 27) protarsus, lateral view; 28) left elytron, lateral view; 29) same, detail of surface structure, lateral view.

FIGURES 30 – 36. Drylichus hylesinoides Heller, male; 30) aedeagus, ventral view; 31) same, dorsal view; 32) same, lateral view; 33) detail of ventral sac and fibula, ventral view; 34) apex of paramere, ventral view; 35) male sternite 9, ventral view; 36) male sternite 8, ventral view. Scale = 0.1 mm.

FIGURES 37 – 40. 37) Drylichus hylesinoides Heller, female, ovipositor, lateral view; 38) the same, sternite 8, ventral view; 39) D. fidelitas sp. nov., female, ovipositor, lateral view; 40) the same, sternite 8, ventral view. Scale = 0.1 mm.