Carpiradialis tamaulipensis ~ 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 : 567-570

Carpiradialis tamaulipensis ~ Nino-Maldonado and Clark , new species

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( Figs. 2A–C , 3D–F, H )

Diagnosis. This species is much smaller than the only other known species of the genus (3.0–3.2 vs. 5.1–7.0 mm long), and the elytra are either unicolorous dark, or pale with only the marginal areas darkened (as in Figs. 2A, C ). Moreover, both the aedeagus and the prolongation of the male hind tibia are apically pointed ( Figs. 3D, E, H ).

Description of Holotype (Male). Form elongate oval; length 3.0 mm; width 1.3 mm across elytral humeri, 1.57 mm at mid-length of elytra, 1.4 mm at base of elytral declivity (as in Fig. 2A ). Vertex, central area of pronotum, margins of elytra, metaventrite, and abdomen dark brown; clypeus, margins of pronotum, disc of elytra, ventral areas of prothorax, and legs pale brown (as in Figs. 2A–C ).

Head largely dark brown; frontal ridge, clypeus, ventral areas, and mouthparts pale brown. Vertex largely smooth, glabrous; frontal calli smooth, subtriangular, 0.2 mm long, 0.1 mm wide, delimited above by well-marked depression, mesally contiguous; interocular distance equal to 0.6 times maximum width of head; antennal fossae 0.1 mm in diameter, separated from each other by distance subequal to diameter; genae with length subequal to width of maxillary palp. Eyes oblong, approximately 1.4 times as long as wide ( 0.3 mm long, 0.2 mm wide).

Antennae nearly filiform, extending to near middle of elytra. Color largely dark brown; antennomeres 10–11 and ventral areas of 1–4 paler. Antennomeres 1–3 comparatively sparsely setose; antennomeres 4–11 densely setose; antennomere lengths (mm) from 1 to 11 as follows: 0.2, 0.1, 0.1, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2.

Pronotum 1.5 times as wide as long (1.0 mm wide, 0.6 mm long), widest slightly anterior to midlength; anterior part of pronotum 1.1 times as wide as head; shape slightly arched transversely, with weak depression on each side; surface distinctly punctate, glabrous; anterolateral and posterolateral angles each with one comparatively long white seta, plus smaller white setae; anterior margin lacking bead, densely bordered with extremely short, inconspicuous, white setae; lateral margin strongly carinate; posterior margin with very fine bead, densely bordered with short white setae. Scutellar shield subtriangular, dark brown, glabrous, shiny; length 0.2 mm; width at widest point 0.2 mm.

Elytra pale yellowish brown, broadly margined with dark brown along basal, lateral, and distal areas (as in Figs. 2A, C ). In dorsal view, elytra together 1.6 times as long as wide; length 2.9 mm; width across humeri 1.3 mm, at mid-length 1.5 mm, at base of distal declivity 1.4 mm. Humeral calli well developed; basal calli faintly indicated; longitudinal costae absent. Surface distinctly punctate throughout, with interpunctural distances subequal to diameters of punctures. Epipleuron wide basally, visible in lateral view, narrowing from basal third toward apex; sparse white setae present.

Ventral areas brown, with head, prothorax, and mesothorax paler than metathorax and abdomen. Pro- and mesothoraces largely glabrous; metathorax and abdomen setose. Prosternum anterior to coxae short, with length subequal to distal width of front tibia; procoxae very narrowly separated from each other by prosternal process; procoxal cavities open posteriorly. Mesothorax impunctate, glabrous. Metaventrite rather sparsely covered with white setae; metanepisternum densely covered with white setae. All abdominal ventrites smooth, densely covered in long, white setae; terminal ventrite apicomedially impressed, with very short rectangular lobe at apex.

Legs yellowish brown, paler than abdomen. Femora covered with white setae; front femur 0.6 mm long; middle femur 0.5 mm long; hind femur 0.8 mm long. Tibiae densely setose, each armed with small terminal spur; front tibia 0.6 mm long; middle tibia 0.6 mm long; hind tibia 0.7 mm long (plus 0.2 mm long distal prolongation); distal prolongation of metatibia apically pointed, 0.1 mm wide at widest part ( Fig. 3G ). Tarsi densely setose; basal tarsomere slightly broader distally than basally, slightly shorter than following tarsomeres combined (0.3 vs. 0.4 mm); tarsal claws appendiculate.

Aedeagus symmetrical in dorsal view, distally narrowed to apical point, 1.0 mm long, 0.2 mm wide ( Fig. 3D ). In lateral view, aedeagus curved ( Fig. 3F ) ( 0.2 mm from dorsal edge at highest point to imaginary line from apicoventral tip to basoventral extreme).

Variation. Specimens measure 3.0– 3.2 mm long. The color varies from entirely dark brown to light brown with the pronotal disc and the elytral margins dark. In some of the paler specimens, the dark pronotal marking is subdivided into several illdefined blotches. Females lack the prolongation of the hind tibia and the lobed fifth ventrite.

Holotype. “ MEXICO: TAMAULIPAS \ RESERVA EL CIELO \ LOCALIDAD 15-10 \ 26/03/ ~ 2004 \ S. NINO Y T. ORNELAS ” ( male, BYUC) .

Paratypes. MEXICO, Coahuila, 15 mi. SE Saltillo, hwy. 57 , 20-VI-1983, C. W. & L. O’ Brien & G. Marshall ( 1 male, 6 females, EGRC) ; MEXICO, Hidalgo, 2 mi NW junction Hwy. 105 on road to Parque Nacional El Chico , 11-V-1983, L. O’ Brien, G. B. Marshall ( 1 male, FIC-UAT) ; MEXICO, Hidalgo, 5 mi. W Tulancingo , el. 7300 ft., 11-VI-1967, S. L. Wood ( 1 male, BYUC) ; MEXICO, Nuevo León, Cerro Potos´ı , 12,1000, 1- VI-1987, R. Turnbow ( 1 male, EGRC) ; MEXICO, Nuevo León, Cerro Potos´ı 3658 me nr. Galeana , 1- VI-1987, R. Anderson, R. Turnbow, pine forest ( 1 male, TAMU) ; MEXICO, Nuevo León, 14 mi. W Iturbide , 11-IV-1979, T. P. Friedlander & J. C. Schaffner ( 4 males, TAMU) ; MEXICO, Puebla, 10 mi. S Matamoros , 5000 ft., 14-VI-1967, S. L. Wood ( 1 male, BYUC) ; MEXICO, Tamaulipas, Municipio Gómez Far´ıas, San José , 1350 m, 15-III-1988, P. Kovarik, R. Jones ( 1 female, BYUC) ; MEXICO, Tamaulipas, Municipio Gómez Far´ıas, 2 km SW San José , 1350 m, 16-III-1988, P. W. Kovarik, R. W. Jones ( 1 male, BYUC; 1 male, FIC-UAT) ; MEXICO, Tamaulipas, Municipio Tula, La Presita , Ca~ nón de Coyote , 1900 m, 16-III-1987, P. Kovarik, R. Jones, R. Trevino ( 13 males, 6 females, BYUC; 5 males, 4 females, FIC-UAT) ; MEXICO, Tamaulipas, Municipio Victoria, Altas Cumbres , 14-III-1987, R. Jones & P. Kovarik ( 4 males, 2 females, TAMU) ; MEXICO, Tamaulipas, Municipio Victoria, Altas Cumbres , 1200 m, 17-III–11-V-1987, P. Kovarik, R. Jones, carrion pitfall ( 1 male, TAMU) ; MEXICO, Tamaulipas, summit above Julilo , approx. 1,767 m elev., 25–26-VI-1980, E. G. Riley ( 1 male, 1 female, EGRC) .

Etymology. The specific epithet refers to the Mexican state of Tamaulipas, where many of the specimens were collected.

Comments. Although the beetles are much smaller and differently colored than C. pueblensis, the tibial prolongation of the male is similar. The aedeagi are also of a similar appearance.

Figures

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

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.