Diutius Opitz

Opitz, Weston, 2014, Taxonomy of the New World Checkered Beetle GeneraAkonesisOpitz, New Genus, AntennosusOpitz, New Genus, CrusbatusOpitz, New Genus, andDiutiusOpitz, New Genus (Coleoptera: Cleridae: Peloniinae), The Coleopterists Bulletin 68 (3), pp. 411-428 : 426

Diutius Opitz , new genus

Type Species. Pelonium gallerucoides Spinola, 1844a: 372 .

Diagnosis. Species of this genus have been associated with Pelonium Spinola and Cregya LeConte. From Pelonium , Diutius specimens can be distinguished by having 10 antennomeres; Pelonium specimens have 11 antennomeres. The capitular antennomeres of Diutius specimens are long and slender, but in Cregya specimens they are short and triangular.

Description. Size: Length 6.0–8.4 mm; width 2.2–3.0 mm. Form ( Figs. 61, 62 ): Oblong, robust (about 3X longer than broad), body deep. Vestiture: Dorsum profusely vested with pale pubescence; antenna moderately setose; elytra with 1° and no 2° setae or without 1° but with 2° setae. Head: Cranium subquadrate, frons narrower or as wide as eye, profusely indented with small setiferous punctures; gula large, subquadrate, sutures diverging anteriorly, gula with 2 well-developed, setose post-gular processes; labrum shallow, incised distally; mandibles stout, anterior dens acuminate, medial and posterior dens well-developed; maxilla well-developed, terminal palpomere securiform; labium welldeveloped, terminal palpomere securiform, capitulum long and slender ( Fig. 34 ) eyes large, coarsely faceted, ocular notch large; antenna comprised of 10 antennomeres, capitate, capitulum long and slender, funicular antennomeres subfiliform. Thorax: Pronotum slightly subquadrate, disc flat, side margins with slightly developed lateral tubercle, dorsolateral carina incomplete but extending anteriorly beyond tubercle and confluent with pronotal hem posteriorly, prointercoxal process narrow, slightly expanded distally; pronotal projections long, approximating prointercoxal process; elytron with or without asetiferous punctures, epipleural fold wide and in ventral position, tapered to elytral apex, elytral anterior margin not carinate; metathoracic wing fully developed; profemora not swollen and without spines, tibial spur formula 0-2-2, tarsal pulvillar formula 3-3-3, ungues with basal denticle. Abdomen: Aedeagus ( Figs. 37, 38 ) shorter than length of abdomen, distal region of phallobase lobed, lateral lobes not fimbriate, tegmen short, phallobasic struts confluent with phallobasic apodeme, phallobasic rod absent, phallic plates wide, spinous at their outer margins; spicular fork well-developed ( Fig. 15 ), spicular apodemes fused, intraspicular plate long and linear. Alimentary canal: With well-developed stomodaeum, ventriculus, and proctodaeum ( Fig. 43 ); ventricular crypts not well-developed; 4 cryptonephridial malpighian tubules. Female mesodermal reproductive organs: Spermathecal capsule feebly sclerotized; spermathecal gland attached to middle of capsule ( Fig. 45 ). Male mesodermal reproductive organs: Two pairs of accessory glands, lateral pair much longer than medial pair; testis spheroid ( Fig. 44 ). Brain and ventral nerve chord: As in Fig. 46 .

Distribution. This genus is known from Ecuador, Bolivia, and Brazil.

Figures

Figs. 61–64. Habitus. 61) Diutius gallerucoides; 62) Diutius pallidus; 63) Akonesis vittatis; 64) Akonesis pictipennis.

Figs. 30–42. Morphological structures. 30) Akonesis vittatis, pronotum; 31) Akonesis pictipennis, pronotum; 32) Diutus pallidus, pronotum; 33) Crusbatus spinosus, pronotum; 34) D. pallidus, antenna; 35) Diutus gallerucoides, antenna; 36) C. spinosus, antenna; 37) D. pallidus, tegmen; 38) D. pallidus, phallus; 39) C. spinosus, spicular fork; 40) C. spinosus, male, pygidium; 41) C. spinosus, tegmen; 42) C. spinosus, phallus.

Figs. 1–15. Akonesis vittatis. 1) Head, frontal view; 2) Head, ventral view; 3) Head, dorsal view; 4) Pronotum; 5) Antenna; 6) Prothorax, ventral view; 7) Metathoracic wing; 8) Mandible; 9) Labium; 10) Maxilla; 11) Labrum; 12) Tegmen; 13) Phallus; 14) Metendosternite; 15) Spicular fork.

Figs. 43–46. Diutus pallidus. 43) Alimentary canal; 44) Male mesodermal internal reproductive system; 45) Female mesodermal internal reproductive system; 46) Brain and ventral nerve cord.