Caledonogonus, Č, Peter Hlavá, 2009

Č, Peter Hlavá, 2009, The Pselaphinae (Coleoptera: Staphylinidae) of New Caledonia and Loyalty Islands. II. Revision of the tribe Tyrini Reitter, 1882, Zootaxa 2010, pp. 46-56 : 52

Caledonogonus gen. nov.

Type species. Caledonogonus loebli sp. nov.

Diagnosis. Head with vertexal foveae present, ventrally lacking ridges and spines, maxillary palpi with segments II and III pedunculate at base, fourth segment triangular, apical pseudosegment absent. Pronotum with distinct median fovea, lacking lateral foveae, median metaventral fovea present. Each elytron with two basal foveae. Abdomen with first visible tergite (tergite IV) longest.

Description. Length 1.4–1.6 mm.

Head with broad rostrum bearing large triangular depression between distinct and prominent antennal tubercles, frontal foveae absent, vertexal foveae punctiform; eyes large, prominent, with 5–8 facets, temples short, rounded; ventrally head with median gular fovea transverse, two anterior foveae located before eyes well-defined, lacking ridges and spines; maxillary palpi ( Fig. 12 ) with segments II–III pedunculate, segment II pedunculate in basal half, longest, about twice as long as III, segment III almost oval, gradually widening to apex from very shortly pedunculate base, segment IV triangular, with large sensory area at apex and lacking apical pseudosegment; antennae ( Fig. 8 ) covered with dense setae, scape bent and very long, about as long as funicule, much longer than pedicel, club three-segmented; neck broad.

Pronotum round, anterolateral angles completely absent, with median fovea devoid of setae, lacking lateral foveae and antebasal sulcus. Thorax with median mesoventral foveae, without lateral procoxal foveae, but with median and lateral metaventral foveae.

Elytra short, each with two basal foveae; each fovea with stria extending from foveae through nearly three-quarters of elytron length.

Abdomen longer than elytra, with first visible tergite (tergite IV) longest, but only slightly longer than second visible tergite (tergite V) and distinctly shorter than second and third visible tergites combined; convex, lacking basal depression, carinae and sulci; tergite IV with lateral foveae adjacent to paratergite present, paratergites VII–X well developed.

Sexual dimorphism not apparent.

Remarks. Caledonogonus can be readily separated from Anagonus and Paranagonus by the presence of two basal foveae on each elytron, the lack of ridges and spines on the ventral side of the head, the absence of the lateral pronotal foveae and the apical palpal pseudosegment.

Distribution: New Caledonia.

Etymology. The name is a combination of „ Caledono- “ referring to New Caledonia and „ -gonus “ showing the relationship of the new genus to Anagonus . Gender masculine.

Figures

FIGURES 8 – 12. Antenna (8) and maxillary palpus (9 – 12) of Tyrini. 8, 12 — Caledonogonus loebli sp. nov.; 9 — Anagonus fracticornis Fauvel; 10 — A. breviscapus sp. nov.; 11 — A. spinipalpis sp. nov. Scale bar 0.2 mm.