Hadrocryptolarynx Haran, 2023

Haran, Julien M., Marvaldi, Adriana E., Benoit, Laure, Oberlander, Kenneth, Stals, Riaan & Oberprieler, Rolf G., 2023, Revision of the enigmatic South African Cryptolaryngini (Coleoptera, Curculionidae), with description of a new genus and twenty-two new species, European Journal of Taxonomy 877 (1), pp. 1-89 : 66-68

Genus Hadrocryptolarynx Haran gen. nov.

urn:lsid:zoobank.org:act:1983869F-4CDD-43AD-A2B0-CAEC1CED873B

Type species

Hadrocryptolarynx major Haran gen. et sp. nov., by present designation.

Differential diagnosis

Among the specimens of, or similar to, Cryptolarynx available for study, a series was found that differ from all species of Cryptolarynx in having a larger body size (length ca 6.0 mm; only ca 4.5 mm in the largest Cryptolarynx ), a more elongate shape in the male (more or less globular in Cryptolarynx ), elongate metatarsi with segment 2 at least 1.5 × as long as wide (shorter in Cryptolarynx ) and apically fused and glabrous parameroid lobes of the aedeagus (divided and setiferous in Cryptolarynx ).As already suggested by Oberprieler (2014), these differences are deemed significant to assign these specimens to a different genus.

Etymology

This genus is named in reference to the remarkably larger size and bulk of its type species compared to that of species of Cryptolarynx . The name is a noun in the nominative singular case and its gender is masculine.

Description (♂)

MEASUREMENTS. Medium-sized, body length 2.0–6.0 mm. Body shape elongate in dorsal view, elytra and pronotum subequal in width. Pronotum widest at or slightly anteriorly of midlength; base narrower than elytra at humeri. Elytra widest near midlength. Body in lateral view ( Fig. 3X ) slightly hunched, highest just behind elytral base to middle of elytral length; head almost hypognathous.

COLOUR AND VESTITURE. Body integument black; antennae, tibiae and tarsi generally reddish. Dorsal vestiture (pronotum + elytra) consisting of short, recumbent clothing scales 2–5 × as long as wide, not aligned on interstriae, more or less concealing integument, colour ranging through black, dark brown to pale brown and grey to white; darker scales usually concentrated medially on pronotum and from there in broad median stripe along elytral interstriae 1–3; paler scales concentrated on a spot near middle of elytral interstriae 1–4.

HEAD. Head capsule globose, in repose deeply retracted into prothorax, leaving only vertex and eyes visible in dorsal view. Eyes subcircular or slightly oval, convex, situated sublaterally, surrounded by a ring of pale recumbent scales. Forehead flat, slightly narrower than width of an eye; median fovea absent. Rostrum very short and broad, not differentiated from head, dorsal surface perpendicular to longitudinal axis of prothorax when head in repose. Epifrons flat, as wide as forehead, epifrontal scales suberect and orientated laterad, towards scrobes. Mandibles beak-like, densely setose (ca 20 setae each), with a pair of longer erect setae arising medio-laterally. Maxillae with galea and lacinia separate, both bearing apical setae ( Fig. 8Q ). Antennae inserted subdorsally at approximately middle of rostrum; scapes slender, as long as width of epifrons between antennal insertions, regularly and moderately curved, apically clavate and bearing erect setae, in repose folding into narrow scrobes extending onto underside of rostrum; funicles 7-segmented, longer than scapes, segment 1 elongate, funicles entirely hidden between head and cuticular anteroventral expansion of prothorax when head in repose; clubs 4-segmented, fusiform, acuminate, shorter than funicles.

THORAX. Pronotum moderately transverse; integument densely punctate, narrow spaces between punctures dull; anterior margin bisinuate, posterior margin arcuate, fitting closely to elytral bases up to level of humeri. Prothorax anteriorly on each side produced into a large sharp-rimmed ventrolateral lamina extending from lower level of eye down to anterior edge of procoxa, concealing anterior prothoracic margin beneath it, rim of lamina asetose but anterior margin fringed with row of dense plumose scales, longer below eyes but shorter ventrally along prosternum. Prosternum broad, short, depressed below anterior edge of procoxae, declivous, abutting rostrum when head in repose; procoxal cavities medially confluent, hypomeral lobes behind them short, suture of median junction obscure. Mesoventrite deeply depressed, almost vertically declivous, intermesocoxal process subtuberculate; mesepimera broadly separating mesanepisterna from elytral margin. Metaventrite between metacoxae as wide as metatarsus; metanepisterna fully fused to metaventrite, metanepisternal suture completely obliterated.

SCUTELLUM. Scutellar shield very small, indistinct.

ELYTRA. Broadly ovate, longer than wide; jointly rounded at apex; elytral base broadly concave, not marginate; integument flat, shiny, 10-striate but striae indiscernible on outer surface, mixed with regular punctures.

METATHORACIC WINGS. Absent.

LEGS. Slender. Procoxae subcontiguous, distance between mesocoxae equal to width of segment 5 of mesotarsus. Trochanters with single long erect seta. Femora subcylindrical, unarmed; metafemora not reaching elytral apex. Tibiae cylindrical, inner margin entire, without teeth; apex without spurs but with small stout mucro; pro- and mesotibiae curved in distal half, narrowing from base to apex; metatibiae slightly curved laterally, without corbels. Tarsi flattened; protarsi short, segments 1 and 2 isodiametric; metatarsi slender, segment 1 2× as long as wide, as long as 2, 3 deeply bilobate, shorter than 2, 5 clavate, longer than 3; claws paired, free, divaricate, simple with long stiff ventrobasal seta.

ABDOMEN. Ventrites 1–4 medially flat, ventrite 5 slightly convex; ventrite 1 medially about twice as long as laterally, as long as ventrites 2–3 combined, intercoxal process ogival, apically acuminate.

MALE TERMINALIA. Penis elongate. Tectum narrow but distinct; endophallus with copulatory sclerite divided into 2 symmetrical, elongate structures. Parameroid lobes of dorsal plate of tegmen fused and jointly evenly rounded at apex, devoid of setae. Spiculum gastrale asymmetrical; divergence of basal arms V-shaped.

FEMALE TERMINALIA. Gonocoxites ( Fig. 8N ) elongate, narrowly triangular, narrowed apicad and rounded apically, with only a few setae; styli inserted apicolaterally, 2× as long as wide, bases distinctly separate, apices with 5–6 long setae, setal length subequal to that of styli. Sternite VIII ( Fig. 8O ) with basal arms symmetrical, 0.67 × length of apodeme, merged at apex. Spermatheca ( Fig. 8P ) stocky, cornu wide and curved, nodulus rounded, collum and ramus not differentiated.

Sexual dimorphism

The sexes can be distinguished by the shape of ventrite 1 (convex in male, concave in female), and by the shape of the elytra (more elongate in male).

Remarks

The genus Hadrocryptolarynx gen. nov. is presently monotypic.

Figures

Fig. 3 (Part I) (next page). Habitus of males of species of Cryptolarynx Van Schalkwyk, 1966 (lateral view). A. C. vitis (Marshall, 1957). B. C. subglaber Haran sp. nov. C. C. squamulatus Haran sp. nov. D. C. muellerae Haran sp. nov. E. C. hirtulus Haran sp. nov. F. C. robustus Haran sp. nov. G. C. namaquanus Haran sp. nov. H. C. carinatus Haran sp. nov. I. C. variabilis Haran sp. nov. J. C. estriatus (Marshall, 1957). K. C. pyrophilus Haran sp. nov. L. C. pilipes Haran sp. nov. Not to scale.

Fig. 8 (next page). Structural details and measurements of Cryptolaryngini Van Schalkwyk, 1966. A. Cryptolarynx spinicornis Haran sp. nov., cephalic view, arrows indicating width of forehead (top) and of epifrons (bottom). B. Head of C. pyrophilus Haran sp. nov., lateral view, arrows indicating distance between eye and scrobe. C. Head of C. pyrophilus Haran sp. nov., in cephalic view, arrows showing prothoracic scales near eyes (top), position of scape when antennae in repose (middle) and position of clubs near procoxae when in repose (bottom). D. C. namaquanus Haran sp. nov., dorsal view, arrows indicate length and width dimensions of pronotum and elytra as measured.E. Metafemora and metatarsus of C. variabilis Haran sp. nov. (left) and C. carinatus Haran sp. nov. (right), arrows indicating position of proximal inner carina in latter species (highlighted with a white line in C. variabilis Haran sp. nov.) and short apical mucro. F. Metatarsus of Hadrocryptolarynx major Haran gen. et sp. nov., arrow indicating elongate segment 2 (longer than wide). G. Hindleg of C. vitis (Marshall, 1957), arrow indicating apical mucro. H. Antenna of C. spinicornis Haran sp. nov., arrows pointing at inner tooth of funicle segments 2 and 4. I. Protibia of C. armatus Haran sp. nov., arrow pointing at inner preapical expansion proximally of mucro. J. Penis of C. oberprieleri Haran sp. nov., dorsal view, black arrows indicating length of penis body and temones and white arrows indicating width of penis body as measured; bottom arrow indicating copulatory sclerite. K. Ovipositor, Crypolarynx variabilis Haran sp. nov. L. Sternite VIII, same species. M. Spermatheca, same species. N. Ovipositor, Hadrocryptolarynx major Haran gen. et sp. nov. O. Sternite VIII, same species. P. Spermatheca, same species. Q. Right maxilla, same species. Not to scale.