Callistomorphus rutai, 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 rutai sp. n. Figs 12, 18, 27, 36, 45, 54, 63, 72, 81, 90, 98, 105, 112, 119

Diagnosis.

This species can be distinguished from other member of the genus by the following set of characters: medial tubercle on elytra very high; smaller tubercles numerous, very distinct and sharp; rostrum slender, slightly curved; penis narrowed before widely rounded apex; parameroid lobes of tegmen distinctly divided from midlength.

Description.

Body length (lb) - 10.80 mm.

Body colour and vestiture (Fig. 18). Colour variable, the body dappled with many small spots, from dark brown to yellowish, especially on distal part of elytra and hind legs. In front of medial tubercles on elytra darker spot from suture to base of tubercles. Pronotum with longitudinal yellowish stripes. Striae with distinct, single, short scales in each point of row.

Head (Figs 63, 72, 81). Slightly wider than long (♂: hw/hl = 1.08). Frons narrower than twice width of eye. Eyes convex, as long as half-length of head (eyl/hl ♂: 0.50), not protruding above margin of head in lateral view. Rostrum longer than pronotum (rl/pl ♂: 1.20), 4.00 × as long as maximum width at apex (rl/arw); longitudinal carina clearly visible only at apical part, posteriorly completely covered with scales. Scape shorter than rostrum (scl/rl ♂: 0.80). First funicle segment ca 1.30 × as long as 2nd; 3rd 0.70 × as long as 2nd; antennomeres from 4th to 7th with similar length, elongate. Club 2.60 × as long as wide, as long as last four funicle segment combined.

Pronotum (Figs 45, 54). Slightly wider than long (bpw/pl ♂: 1.08). Base 1.35 × as wide as apical margin (bpw/apw); apical margin in dorsal view straight with numerous, distinct tubercles (on SEM photography (Fig. 45) apical margin of pronotum is seen as convex because the image was taken in different angle); in lateral view apical margin straight anteriorly, then converging towards base. Medial tubercle on pronotal disc distinct, strongly protruding, separate apically. Width of medial constriction in relation to apical and basal margin in male: mpw/apw = 0.65, mpw/bpw = 0.45.

Elytra (Figs 27, 36). Slightly more than 1.50 × as long as its width (el/bew ♂: 1.55). Subparallel from base to apical part; posterior calli distinct, strongly protruding beyond outline of elytral in dorsal view. Odd intervals with distinct, pointed tubercles that are easily visible in dorsal and lateral views, each furnished with single, hooked, elongate scale. Striae weakly impressed, formed by oval punctures, each with single, whitish scale inside. Medial tubercles distinct, strongly protruding, as high as almost half its length. Scutellum ca 1.20 × as long as wide.

Abdomen (Figs 90, 105). Slightly longer than wide (al/aw ♂: 1.05) in male. Last ventrite 2.75 × wider than long (lvw/lvl). Pygidium as in Fig. 105.

Male terminalia (Figs 98, 112, 119). Penis body distinctly longer than apodemes; almost subparallel from base to apical part; narrowed from fourth-fifth of length, apically widely rounded; basal part unsclerotised; distinctly, regularly curved in lateral view, apically strongly upturned, apex rounded. Internal sac without any structure or sclerites. Parameroid lobes of tegmen with extended common base, as long as apodeme, from half of length divided. Spiculum gastrale basally separate into two extended lobes; hemisternites indistinct.

Female - unknown

Measurements. ♂: al 4.30, apw 2.00, arw 0.75, aw 4.10, bew 4.80, bpw 2.70, el 7.40, eyl 0.60, frw 0.60, hl 1.20, hw 1.30, lb 10.80, lvl 0.80, lvw 2.20, mpw 1.30, pl 2.50, rl 3.00, scl 2.40.

Type material.

Holotype, ♂ (here designated) - New Caledonia (S); 22°11'S, 166°30'E; Koghi Mts.; humid forest, 500-550 m; 21.01.2004, leg. M. Wanat (MNHN).

Etymology.

This species is dedicated to my colleague Rafał Ruta, PhD ( Wrocław, Poland), a great field researcher and specialist in Scirtidae ( Coleoptera ), who collected some specimens used in this paper, including the holotype of C. minimus sp. n.

Remarks.

In lateral view the head and rostrum are similar to those of C. malleus sp. n. (rostrum elongate, slightly curved). However, C. rutai sp. n. has more prominent medial tubercles on the pronotum and elytra, the outline of elytra in dorsal view is more robust, and the shape of the penis is characteristic.