Coadnatus Opitz, 2017

Opitz, Weston, 2017, Classification, Natural History, and Evolution of the Orthopleurinae (Coleoptera: Cleridae). Part VI. The New Genera Coadnatus Opitz, Furcadia Opitz, and Latupusillus Opitz, One New Species of Funicula Opitz, and Four New Species of Romanaeclerus Winkler, The Coleopterists Bulletin 71 (3), pp. 421-433 : 422-424

Coadnatus Opitz , new genus

Type Species. Coadnatus sakaii Opitz , new species.

Diagnosis. In a key to the genera of Orthopleurinae ( Opitz 2009a) , Coadnatus keys to the New World genus Nelsopelonium Barr , from which Coadnatus is distinguished by a more cylindrical body form, pronotal disc more coarsely rugose, glabrous pronotal arch, asetiferous elytral punctation that is significantly larger, and capitular antennomeres 9 and 10 broadened and acuminate at their anteroapical angle.

Synapotypic Characteristic. Lateral phallobasic lobes articulate ( Fig. 16 ).

Description. Size: Length 5.5–6.0 mm; width 1.3–1.5 mm. Form: Oblong, subcylindrical, about 3 times longer than broad. Vestiture: Disc of cranium and pronotum profusely vested with pale setae, elytral disc vested with 1° setae and shorter, profusely distributed 2° setae. Head: Cranium quadrate, frons very wide, indented with small, noncontiguous, setiferous punctation; gula small, triangular, sutures oblique, gular process narrow and bifid; labrum short, medial incision deep and broad; mandible short, subacuminate; terminal maxillary and labial terminal palpomeres securiform; eyes small, finely faceted, ocular notch large; antenna ( Fig. 1 ), capitate, capitulum lax, scape large, longer than combined length of pedicel and antennomere 3, funicular antennomeres progressively shorter to capitulum, capitular antennomeres 9 and 10 expanded and acuminate at anteroapical angle, antennomere 11 oblong. Thorax: Pronotum oblong, convex, lateral margins slightly incised at anterior third, arch and anteromedial region of pronotal disc glabrous, remainder of pronotum coarsely punctate, transverse subapical and prebasal depressions feebly developed, prointercoxal process expanded distally; pronotal projections long, contacting but not fused to prointercoxal process; elytral basal half sculptured with large, spheroid, asetiferous, subseriate punctation, 1° setae always adjacent to asetiferous punctation, 2° setae present, epipleural fold narrowing to elytral apex, anterior margin boldly carinate, carina continuous with elevated sutural margin; tibial spur formula 2-2-2, tarsal pulvillar formula 3-3-3, unguis with well-developed denticle. Abdomen: Six visible sternites; aedeagus ( Figs. 16, 17 ), with 3 phallobasic lobes, lateral lobes freely articulated; phallobasic struts not confluent with phallobasic apodeme, phallobasic rod bifid distally; phallic plates, narrowed preapically; spicular plates not flared, spicular apodemes not fused at their base, intraspicular plate oblong-linear.

Distribution. This monotypic genus is known from Thailand.

Etymology. The generic name Caodnatus is a Latin compound name derived from the prefix co- (= together) and the adjective adnatus (= united with). I refer to the morphology of the continuous pronotal commissure. Gender: Masculine.

Coadnatus sakaii Opitz , new species ( Figs. 1, 16–18 , 25 , 29 , 39 )

Type Material. Holotype: Ƌ. THAILAND, Chiang Rai, Wiang Pa Pao , 27.V.–1.VI.2014, K. Takahashi leg ( FSCA) . Paratype: One specimen. THAILAND, Chiang Rai, Wiang Pa Pao , 27.V.–1. VI.2014, K. Takahashi leg ( KSCJ) .

Diagnosis. This species is readily identified by its elytral color ( Fig. 29 ).

Description. Size: Length 6.0 mm; width 1.5 mm. Form: As in Fig. 29 . Color: Cranium, antennae, and mouthparts castaneous; prothorax shiny black; mesoscutellum black; elytra bicolored, humeral region, anterior margin, region around mesoscutellum, and apex black; remainder of disc yellow; pro- and mesothoracic legs testaceous, metathoracic legs bicolored, femora black, tibiae and tarsi testaceous; abdomen black. Head: Antennal capitulum well-developed ( Fig. 1 ), capitular antennomeres 9 and 10 expanded and acuminate at anteroapical angle, antennomere 11 oblong; maxillary and labial terminal palpomeres securiform; eyes much narrower than frons (EW/FW = 20/45). Thorax: Pronotum ( Fig. 25 ) oblong (PW/PL = 88/112), lateral margins slightly incised at anterior third; elytral asetiferous punctation large and restricted to elytral basal third, punctation subseriate, interstitial spaces smooth and shiny; sutural margin elevated at base. Abdomen: Pygidium scutiform; aedeagus ( Figs. 16–18 ) with 3 phallobasic lobes, lateral lobes articulated; phallobasic struts not confluent with phallobasic apodeme, phallobasic rod bifid distally; phallic plates, narrowed preapically; spicular plates not flared, spicular apodemes not fused at their base, intraspicular plate oblong-linear.

Variation. The type specimens are quite homogeneous.

Natural History. The type specimens were collected from late May to early June.

Distribution. This species is known only from the type locality ( Fig. 39 ).

Etymology. The specific epithet sakaii is a dedicative patronym to honor Kaoru Sakai for his dedication to his beetle collection and generous loan policy.

Figures

Figs. 1–20. Antennae and male genitalia. Antennae: 1) Coadnatus sakaii; 2) Romanaeclerus gerstmeieri; 3) Furcadia sandala, female; 4) Romanaeclerus quadratus; 5) F. sandala, male; 6) Romanaeclerus dimidius; 7); Romanaeclerus vitellinus; 8) Funicula albocapilla; 9) Latupusillus laculatus. Aedeagi and spicular fork: 10) F. albocapilla, phallus; 11) F. albocapilla, tegmen; 12) F. albocapilla, spicular fork; 13) F. sandala, spicular fork; 14) F. sandala, phallus; 15) F. sandala, tegmen; 16) C. sakaii, tegmen, dorsal view; 17) C. sakaii, phallus; 18) C. sakaii, tegmen, ventral view; 19) R. vitellinus, phallus; 20) R. vitellinus, tegmen, ventral view.

Figs. 21–28. Pronota, dorsal view. 21) Funicula albocapilla; 22) Romanaeclerus quadratus; 23) Furcadia sandala; 24) Romanaeclerus vitellinus; 25) Coadnatus sakaii; 26) Latupusillus laculatus; 27) Romanaeclerus dimidius; 28) Romanaeclerus gerstmeieri.

Figs. 29–32. Habitus. 29) Coadnatus sakaii; 30) Funicula albocapilla; 31) Furcadia sandala; 32) Latupusillus laculatus.

Figs. 39–40. Geographic distributions of 39) Coadnatus sakaii and Furcadia sandala; 40) Funicula albocapilla.