Aphanocephalus calderi Szawaryn, 2025, sp. nov.
Creators: name: Szawaryn, Karol
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Discolomatidae
Aphanocephalus
Aphanocephalus calderi

description: Aphanocephalus calderi sp. nov.
urn:lsid:zoobank.org:act: 6AD3DC17-6A4A-4E3D-B950-5F6C2419A65B
(Figs 7E, F, 10G–I)
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). Paratypes. SOUTH AUSTRALIA: same label data as the holotype (2, ANIC).
Type locality. South Australia, Parachilna Gorge.
Distribution. South Australia (Fig. 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) and truncate in the latter (Fig. 13F). In lateral view, the penis of A. calderi has a more distinctly rounded inner margin (Fig. 10G) than in A. potamophilus (Fig. 13D).
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). 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); 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); 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).
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).
Female genitalia not studied.
description: Published as part of Szawaryn, Karol, 2025, Revision of the Australian species of Aphanocephalus Wollaston (Coleoptera: Discolomatidae), pp. 401-440 in Zootaxa 5632 (3) on pages 416-418, DOI: 10.11646/zootaxa.5632.3.1, http://zenodo.org/record/15372416