Caulomorphus talyschensis Reitter, 1897

Hlaváč, Peter, 2020, Review of the tribe Typoderini (Coleoptera: Curculionidae) from Caucasus with the description of a new species of Caulomorphus from Armenia, Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 60 (2), pp. 629-638 : 636-637

Caulomorphus talyschensis Reitter, 1897

( Figs 5d–f )

Caulomorphus talyschensis Reitter, 1897: 126 (original description).

Rൾංඍඍൾඋ (1911): 159 (key); Oඌൾඅඅൺ (1970): 377 (redescription);

Oඌൾඅඅൺ et al. (2003): 691 (key), 693 (key).

Type locality. ‘bei Lenkoran’ [= Azerbaijan, near Lenkoran].

Material examined. AZERBAIJAN: Astara, Istisu W Astara, 100 m, 2.–6.vi.1996, 1 J 1 ♀, W. Schawaller lgt. ( SMNS, CPHP).

Redescription. Body convex. Length 3.60–3.70 mm, maximum width of elytra 1.10–1.20 mm. Head and

pronotum shiny, body and legs pitchy-brown, antennae slightly lighter, elytra with short golden setae. Rostrum curved downwards, with five longitudinal carinae, with short apical setae, scrobe deep, straight, not visible in dorsal view. Antennae long, with dense pubescence, scape longly pedunculate at base, about 1.20× as long as funicule, funicule with 7 antennomeres; antennomeres II and III elongate and expanded to apex, II about 1.7× as long as III, antennomeres IV and V subequal, V 1.25× as long as IV, antennomeres V, VII and VIII subequal, antennal club about 1.80–1.85× as long as antennomere II and about 1.80× as long as wide. Pronotum 1.00–1.05× as long as wide, 1.05–1.15× as long as head, widest in middle, basal margin straight, with closely arranged, large and almost equal punctures, lacking median carina. Prosternum rugosely sculptured, with uneven large punctures. Procoxae separated by narrow isthmus. Mesoventrite about as long as metaventrite, mesoventrite shiny, with even small punctures bearing microseta, with some large punctures on short mesoventral process, mesocoxae separated, isthmus about as wide as half of coxa. Metaventrite with large, shallow, almost confluent punctures and golden setation, metacoxae strongly separated by large, triangular process. Ventrite I longer than II, similarly punctate. Elytra long, subparallel-sided, 1.55–1.60× as long as wide, about 2.10× as long as pronotum, with eight striae composed of large punctures of equal diameter, distance between each two punctures within row slightly less than diameter of puncture, elytral interstriae elevated, with even micropunctures bearing short, golden setae, humeri prominent. Male terminalia. Aedeagus ( Figs 5d–e ) slender, apical lobe parallel-sid- ed, flattened dorsally, rounded at apex, laterally slightly curved, with sharply acuminate apex, with two subequal sclerites, male sternite IX ( Fig. 5f ) curved, asymmetrical, hemisternite with four short apical setae.

Distribution. So far, the species is known only from costal area of the Caspian Sea in Azerbaijan.

Key to males of Caulomorphus

from the Caucasus Region

(modified after Oඌൾඅඅൺ et al. 2003)

1 Elytra oblong-oval, widest in middle. ............................ ............................................. C. muelleri Reitter, 1911

– Elytra subparallel-sided. ................................................ 2

2 Aedeagus wide, sides rounded laterally, moderately curved. ............................................................................. 3

– Aedeagus narrow, parallel-sided, laterally strongly curved ( Fig. 5d ). ............................................................. 6

3 Aedeagus asymmetrical, pronotum lacking median carina. ........................................... C. giocoae Osella, 1970

– Aedeagus symmetrical, pronotum with or without median carina. ...................................................................... 4

4 Pronotum with median carina, sometimes weak but always clearly visible. ......... C. lederi (Chevrolat, 1880)

– Pronotum lacking median carina. ................................ 5

5 Aedeagus with two dentate sclerites, apex oval ( Fig. 5a ). .......................................... C. besucheti Osella, 1970

– Aedeagus with two pointed sclerites, apex slightly constricted ( Fig. 6a ). .............................. C. kociani sp. nov.

6 Elytra with well-defined half-recumbent setae. ............. ......................................... C. talyschensis Reitter, 1897

– Elytra with short recumbent setae. ................................. ......................................... C. amaseianus Osella, 1970

Figures

Fig. 5. Caulomorphus besucheti Osella, 1970: a – aedeagus, dorsal view; b – aedeagus, lateral view; c – sternite IX and hemisternites; Caulomorphus talyschensis Reitter, 1897: d – aedeagus, dorsal view; e – aedeagus, lateral view; f – sternite IX and hemisternite. Scale bars: 0.2 mm.

Fig. 6. Caulomorphus kociani sp. nov. a – aedeagus, dorsal view; b – aedeagus, lateral view; c – sternite IX and hemisternites.Scale bars:0.2 mm.