Callistomorphus torosus, Mazur, Milosz Adam, 2019

Mazur, Milosz Adam, 2019, Redescription of the forgotten New Caledonian weevil genus Callistomorphus Perroud, 1865 (Coleoptera, Curculionidae, Eugnomini) with descriptions of eight new species, ZooKeys 821, pp. 45-83 : 45

Callistomorphus torosus sp. n. Figs 20, 29, 38, 47, 56, 65, 74, 83, 92, 99, 106, 113, 120, 126, 131, 139, 144

Diagnosis.

Together with C. farinosus Perr. and C. szoltysi sp. n. it is one of the largest members of the genus. Body uniformly dark brown. Eyes weakly convex. Elytra in lateral view weakly convex; medial tubercles large; in dorsal view sides of elytra with distinctly protruding small tubercles. Apical part of penis in lateral view strongly upturned, narrowed, apically pointed. Ovipositor gonocoxite and stylus of similar length, set diagonally to each other.

Description.

Body length - 11.30-12.00 mm.

Body colour and vestiture (Fig. 20). Generally dark brown. Indistinct, darker, subtriangular spot between intervals 1-3 situated anteriorly to medial tubercles. White spot on last two intervals present, extended from approximately one-third to two-thirds of length. Apical part of mesepimeron whitish, in contrast to generally dark brown colour of body. Ventral part (metaventrite and ventrites) densely covered by light, variable (from whitish to yellowish) scales.

Head (Figs 65, 74, 83). Subquadrate in female, slightly shorter than wide in male (hw/hl ♂: 0.92; ♀: 1.00). Eyes flattened, slightly in male, more distinctly in female; shorter than half length of head (eyl/hl ♂: 0.38; ♀: 0.46); not protruding above margin of head in lateral view. Frons as wide as double width of eyes or slightly wider. Rostrum slightly longer than pronotum (rl/pl ♂: 1.12; ♀: 1.07); from 3.33 (female) to 3.50 (male) × as long as maximum width at apex (rl/arw), distinctly, regularly curved; longitudinal carina on rostrum distinct, medially covered with scales, surface between eyes and on apical part of rostrum shining. Scape shorter than rostrum (scl/rl ♂: 0.82; ♀: 0.83). First funicle segment 1.60 × as long as 2nd; 3rd 0.65 × as long as 2nd; 4th slightly longer than wide; from 5th to 7th as long as wide. Club slender, 2.50 × as long as wide; as long as last four funicle segment combined. Setae on antennomeres distinct, elongate, moderately protruding.

Pronotum (Figs 47, 56). Subquadrate in male, slightly longer than wide in female (bpw/pl ♂: 1.04; ♀: 1.11). Apical margin straight with distinct tubercles; base from 1.30 × (♂) to 1.35 × (♀) as wide as apical margin (bpw/apw). Medial tubercles distinct, strongly protruding, apically obtuse. Width of medial constriction in relation to apical and basal margin: mpw/apw = 0.61 (♀), 0.65 (♂); mpw/bpw = 0.45 (♀), 0.50 (♂).

Elytra (Figs 29, 38). Slightly more than 1.50 × as long as its width (el/bew ♂: 1.51; ♀: 1.55). Subparallel from base to apical part; 7th interval with strongly protruding tubercle before apex of elytra - posterior calli well developed protruding beyond outline of elytral in dorsal view; in lateral view elytra weakly convex. Odd intervals with distinct tubercles, that are pointed on basal half of elytral disc, and more obtuse on apical part. Striae easily visible, formed by distinct oval punctures. Medial tubercles large; slightly longer than one-quarter length of elytra; in lateral view, more or less one-third of elytral height medially. Scutellum short, subquadrate.

Abdomen (Figs 92, 106, 131). Subquadrate in male, slightly shorter than wide in female (al/aw ♂: 1.00; ♀: 0.93). Last ventrite much wider than long (lvw/lvl ♂: 2.56; ♀: 2.78); both sexes with sharp apical margin; in male apical area distinctly concave, in female apical cavity deeper. Pygidium of male as in Fig. 106, female as in Fig. 131.

Male terminalia (Figs 99, 113, 120). Penis body longer than apodemes; from base to fourth-fifth of length slightly dilated, remainder of penis distinctly narrowed to rounded apex, its basal part sclerotised; in lateral view strongly curved, apically distinctly upward. Internal sac without any distinct structure or sclerites. Parameroid lobes of tegmen divided almost from base. Spiculum gastrale anchor-shaped; hemisternites well sclerotised, fused with base of spiculum.

Female terminalia (Figs 126, 139, 144). Abdominal sternite VIII forked apically, apical lobe enlarged, sclerotised on sides, with erect setae. Abdominal tergite VIII elongate; apex widely rounded. Ovipositor - gonocoxite and stylus of similar length, set diagonally to each other. Spermatheca lost in dissection.

Measurements. ♂: al 4.10, apw 2.00, arw 0.80, aw 4.10, bew 4.90, bpw 2.60, el 7.20, eyl 0.50, frw 0.60, hl 1.30, hw 1.20, lb 11.00, lvl 0.90, lvw 2.30, mpw 1.30, pl 2.50, rl 2.90, scl 2.30.

♀: al 4.30, apw 2.30, arw 0.85, aw 4.60, bew 5.30, bpw 3.10, el 8.00, eyl 0.60, frw 0.60, hl 1.30, hw 1.30, lb 12.00, lvl 0.90, lvw 2.50, mpw 1.40, pl 2.80, rl 3.00, scl 2.50.

Type material.

Holotype, ♂ (here designated) - New Caledonia (N); 20°23.9'S, 164°32.0'E; Mandjélla (subsummit), 11.01.2007, 700-750 m, night beating; leg. M. Wanat & R. Dobosz (MNHN).

Paratype, ♀ - New Caledonia (N); 20°23.9'S, 164°31.9'E; Mandjélla (summit), 10.01.2007, 750-780 m, beating, montane rainforest; leg. M. Wanat & R. Dobosz (MNHW).

Etymology.

This epithet is derived from the Latin adjective " torosus " (muscular) and refers to “muscular” shape and size.