Carpiradialis ~ Nino-Maldonado and Clark, 2020

Niño-Maldonado, Santiago & Clark, Shawn M., 2020, Carpiradialis, New Genus, and Two New Species from Mexico (Coleoptera: Chrysomelidae: Galerucinae), The Coleopterists Bulletin 74 (3), pp. 563-571 : 564-565

Carpiradialis ~ Nino-Maldonado and Clark , new genus

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Diagnosis. The most distinctive feature of this genus is the metathoracic tibia of the male. Nearly opposite the terminal spur, the tibia is distally prolonged into a large, blade-like extension ( Figs. 3G, H ). Using the diagnostic key of Clark (1998), these beetles would be identified as Pseudoluperus (couplet 7 or 13), from which they can easily be distinguished by the above-mentioned prolongation.

Description. Form elongate oval ( Figs. 1A , 2A ). Frontal tubercles distinct, subtriangular to subtrapezoidal; frontal calli distinct, delimited above by distinct depression; gena short, with length no greater than width of terminal maxillary palpomere; antenna nearly filiform. Pronotum laterally carinate, with sparse setae along carina; anterior margin with dense row of short setae, lacking bead; posterior margin with row of dense setae, with bead very fine or absent. Elytra each with well-developed humeral callus, delimited by depression; basal calli poorly indicated; epipleuron wide in basal half, narrow in distal half. Prosternal process very narrowly separating procoxae; procoxal cavities open posteriorly. Each tibia of female equipped with short terminal spur; male with short terminal spur present on hind tibia, either present or absent on front and middle tibiae; male hind tibia prolonged distally to form blade-like structure ( Figs. 3G, H ); tarsal claws appendiculate. Aedeagus symmetrical in dorsal view.

Type Species. Carpiradialis pueblensis Ni~ no-Maldonado and Clark, new species.

Etymology. The name of this new genus refers to the remarkable extension of the posterior tibia of the male. Gender: Masculine.

Comments. The diagnostic key of Clark (1998) emphasized the presence or absence of a bead along the posterior margin of the pronotum. However, this character varies in this new genus, being either very fine yet discernable in one species and missing in the other. Even so, we believe that the two species are closely related and should be classified in the same genus.

Figures

Fig. 3. Carpiradialis species. C. pueblensis, new species, aedeagus: A) Dorsal aspect, B) Ventral aspect, C) Lateral aspect. C. tamaulipensis, new species, aedeagus: D) Dorsal aspect, E) Ventral aspect, F) Lateral aspect. Hind leg of male, distal portion of tibia and basal portion of tarsus: G) C. pueblensis, new species, H) C. tamaulipensis, new species.

Fig. 1. Carpiradialis pueblensis, new species, holotype. A) Dorsal aspect, B) Ventral aspect, C) Lateral aspect.

Fig. 2. Carpiradialis tamaulipensis, new species, paratype. A) Dorsal aspect, B) Ventral aspect, C) Lateral aspect.