Cazeresia impressicornis, Gómez-Zurita & Cardoso, 2025

Gómez-Zurita, Jesús & Cardoso, Anabela, 2025, Systematics and evolution of the New Caledonian endemic genus Cazeresia (Coleoptera: Chrysomelidae, Eumolpinae), Arthropod Systematics & Phylogeny 83, pp. 127-170 : 127-170

Cazeresia impressicornis sp. nov.

Figures 7 g , 8 a

Species # 22: Papadopoulou et al., 2013, p. 481.

Material.

Holotype: Male, JGZC-NC 693 , Poya, Station de Beupré , -21.42392 165.14715, 26 m, 1.iv.2008, J. Gómez-Zurita and A. Cardoso leg., Holotype Cazeresia impressicornis sp. nov. Gómez-Zurita & Cardoso [red label] ( JGZC) . — Paratypes: JGZC: 5 males ( JGZC-NC 694 – JGZC-NC 698 ), Poya, Station de Beupré , -21.42392 165.14715, 26 m, 1.iv.2008, J. Gómez-Zurita and A. Cardoso leg., Paratype Cazeresia impressicornis sp. nov. Gómez-Zurita & Cardoso [red label] ; 1 male, JGZC-NC 284 , Sarramea , -21.67005 165.80852, 37 m, 13.iii.2008, J. Gómez-Zurita, J. A. Jurado-Rivera and A. Cardoso leg., Paratype Cazeresia impressicornis sp. nov. Gómez-Zurita & Cardoso [red label] .

Description.

Body elongate elliptic, moderately convex. Mandibles, head, pronotum, hypomera and prosternum blackish; scutellum, elytra and most ventral surfaces including coxae dark brown; labrum, antennae and legs testaceous, with base of tibiae infuscate; palpi and apex of antennomeres 11 ochre. Length: 4.9 mm; width: 2.4 mm (range of male specimens: 4.2–4.9 mm long, 2.2–2.4 mm wide).

Frons with sparse shallow micropunctures and few small but deep punctures medially and supraocular sulci prolonged medially to middle of dorsal edge of supraantennal calli, nearly contiguous medially; clypeus with small, deep punctures in basal half, and anterior border with relatively deep semicircular emargination. Eyes moderate, separate on frons by 2.3 × their transverse diameter. Relative proportions of antennomeres: 2.5-1.0 - 2.0 - 1.8 - 2.3 - 2.1 - 2.4-2.2 - 2.2 - 2.2 - 3.0; antennomeres 3–8 compressed longitudinally at middle from base to apical enlargement, more apparent in antennomeres 4–7. Posterior border of pronotum with impressed furrow with regular series of small punctures; narrow explanate lateral margin of pronotum with regular series of impressed punctures along compressed border; anterior border of pronotum 0.8 × as wide as posterior border; surface microsculptured, with relatively dense tiny punctures and sparser larger punctures on disc and lateral declivities. Prosternal process about half as wide as transverse diameter of procoxae. Elytra about 1.3 × as long as ensemble width at base, widest behind weakly callous humeri; relatively smooth, shinier than pronotum, entirely glabrous except for few small setae around sutural angle, and with relatively large punctures, smaller than intervals, rather confused anteriorly on disc. Epipleura with fringe of short setae apically. Mesotibiae with rather sharp dorsal keels; basitarsomeres enlarged, wider than third tarsomere in protarsi, and as wide as third tarsomere in meso- and metatarsi; shorter than second and third tarsomeres combined in protarsi, and as long as these in meso- and metatarsi; third bilobed tarsomeres relatively small. Median apodeme of first abdominal ventrite about half as long as ventrite, arched, narrower than mesosternal process; all ventrites with fine microreticulation, abundant fine punctures with long fine, posteriorly adpressed pale yellow setae. Penis (Fig. 7 g ) slender, regularly curved ventrally, with sides slightly concave in ventral view, as wide preapically as wide at base; apex elongate elliptical, arched distally with relatively prominent blunt median projection; gonopore short oval, with distal end separated from apex of penis by distance longer than maximum width of gonopore; dorsal flap subtrapezoidal, longer than wide, covering slightly more than half of gonopore. — Females. Unknown.

Diagnosis.

This species belongs to the group of small (L <6.0 mm), relatively elongate species (ratio L / W> 1.8), elytra parallel in basal half and bearing tiny setae apically, and males with moderately incised anterior border of clypeus, which also includes C. corrugata sp. nov., C. subgeminata sp. nov. and C. spadicea sp. nov. The male of C. impressicornis sp. nov. can be distinguished from C. subgeminata by the sparser and confused punctures anteriorly on disc of elytra and from C. corrugata by the relatively even surface of pronotum. This species shares with C. spadicea the laterally compressed antennomeres and they are almost indistinguishable, but they can be tentatively recognized by the rather uniform brown colour of body and appendages of C. spadicea , compared with the typical colour contrasts in C. impressicornis , with paler elytra and testaceous appendages.

Derivatio nominis.

The name for this species is a compound adjective derived from the Latin participle impressus of the verb imprimō, meaning to impress, to press, and the noun cornus, meaning horns, or in this case antennae.

Distribution.

Cazeresia impressicornis sp. nov. has been found in two inner low-elevation localities in central Grande Terre separated some 75 km away in the southern slopes of the central mountainous chain. It is the only known species of Cazeresia distributed in the dry littoral lowlands of the central region of Grande Terre (Fig. 8 a ).

Figures

Figure 7. Lateral and apical dorsal views of the penis of Cazeresia humboldtiana (Heller) (a), C. australis sp. nov. (b), C. globosa sp. nov. (c) and C. globosa altitudinalis ssp. nov. (d), C. tricolor sp. nov. (e), C. parentalis sp. nov. (f), C. impressicornis sp. nov. (g), C. spadicea sp. nov. (h) and C. spadicea bruna ssp. nov. (i), C. tibialis sp. nov. (j), C. gracilis sp. nov. (k), C. laevigata sp. nov. (l), and C. wanati sp. nov. (m).

Figure 8. Distribution maps of the species and subspecies of Cazeresia Jolivet, Verma & Mille in New Caledonia.