Aphanocephalus calderi, Szawaryn, 2025

Aphanocephalus calderi sp. nov.

urn:lsid:zoobank.org:act:6AD3DC17-6A4A-4E3D-B950-5F6C2419A65B

( Figs 7E, F View FIGURE 7 , 10G–I View FIGURE 10 )

Material examined. Type material.

Holotype. SOUTH AUSTRALIA: male, " 31.38S 138.30E Parachilna Gorge 10km E Parachilina SA 3 sept. 1981 A. Calder / Berlesate ANIC 740 litter base Eucalyptus camaldulensis" ( ANIC) GoogleMaps . Paratypes. SOUTH AUSTRALIA: same label data as the holotype (2, ANIC) GoogleMaps .

Type locality. South Australia, Parachilna Gorge.

Distribution. South Australia ( Fig. 16 View FIGURE 16 ).

Etymology. The specific name “calderi ” is a patronym in honor of Andrew Calder, an Australian entomologist, and the collector of the type series.

Diagnosis. Aphanocephalus calderi , with its rufous-orange dorsal body coloration, is most similar to A. potamophilus . However, it can be distinguished from the latter by the very narrow lateral margins of the elytra, whereas in A. potamophilus , they are distinctly explanate. Moreover, A. calderi has single-sized punctae on the pronotum, while in A. potamophilus , the punctation is double, with larger and coarser punctae in the posterior pronotal corners. The central area of the elytra in A. calderi is covered with small punctae of a single size, whereas in A. potamophilus , there are two intermixed sizes of punctae. The male genitalia of A. calderi are also most similar to those of A. potamophilus , but the apex of the tegmen is rounded in A. calderi ( Fig. 10I View FIGURE 10 ) and truncate in the latter ( Fig. 13F View FIGURE 13 ). In lateral view, the penis of A. calderi has a more distinctly rounded inner margin ( Fig. 10G View FIGURE 10 ) than in A. potamophilus ( Fig. 13D View FIGURE 13 ).

Description. Length: 1.90 mm, width: 1.48 mm. Body elongate oval about 1.3 times as long as wide, moderately convex in lateral view ( Figs 7E, F View FIGURE 7 ). Pronotum and elytra covered with yellowish, moderately long setae, more densely distributed on pronotum than elytra. Head and pronotum entirely rufous-orange; elytra with central part brown with anterior and hind areas rufous-orange ( Fig. 7E View FIGURE 7 ); ventral side rufous-orange; antennae, mouthparts and legs yellow.

Pronotum covered with punctae of a single size. Lateral margins of pronotum bordered, anterior margin without bordering line. Elytra covered with punctae of two sizes, larger non-setiferous punctae just slightly larger than smaller setiferous ones, larger punctae distributed only on lateral sides of elytra, not present in central area. Pronotum and elytra narrowly explanate laterally, margins narrowly visible throughout. Lateral sides of elytra slightly rounded, without pseudopores. Epipleuron with shallow sub-marginal furrow.

Mentum without lateral carinae. Labial palps narrowly separated. Prosternum with notosternal carinae well visible; prosternal process with lateral carinae absent. Metaventrite about same length as ventrite 1. Ventrite 1 longer than ventrites 2–4 combined. Ventrite 1 with large punctae covering lateral areas with central part covered with smaller punctae; ventrites 2–5 covered with punctae of two sizes, coarser in lateral areas and at base of ventrite forming a single row, and smaller on the rest of surface.

Male genitalia. Tegmen in inner view with sides rounded, broadest in middle, tapering toward rounded apex in apical part, with a few short setae in lateral part of apex ( Fig. 10I View FIGURE 10 ); in lateral view broad at base, sub-triangular in apical half, pointed at apex, outer margin slightly rounded, inner margin sinusoidal in middle ( Fig. 10H View FIGURE 10 ).

Penis long, broadening toward apex, outer margin broadly rounded, inner margin broadly rounded in apical half, with sinuate apex; gonopore short, broad, apically truncate, apex of gonopore at the same position as apex of penis ( Fig. 10G View FIGURE 10 ).

Female genitalia not studied.