Anagonus Fauvel, 1903

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 : 47-48

Anagonus Fauvel, 1903

Anagonus Fauvel, 1903: 284 . Type species: Anagonus fracticornis Fauvel, 1903 (by monotypy).

Diagnosis. Head with vertexal foveae devoid of setae, ventrally with prominent, parallel ridges, each bearing sharp spines at middle; maxillary palpi with three apical segments pedunculate at base, fourth segment triangular, apical pseudosegment present. Pronotum round, with median and lateral foveae of different sizes. Each elytron with one large basal foveae. Abdomen with first visible tergite (tergite IV) slightly longer than second (tergite V).

Description. Body length 1.70–2.25 mm.

Head with broad frontal rostrum (exception is A. spinipalpis which has narrower rostrum) antennal tubercles prominent, prolonged posteriad; rostral apex betweeen antennal tubercles with deep impression or sulcus (in A. spinipalpis ); frontal fovea absent, two vertexal foveae well-defined but devoid of setae; eyes large, prominent, with 9–15 facets; temples short, rounded; head ventrally with prominent, parallel ridges, each bearing sharp spines at middle, large gular fovea present; maxillary palpi with segments II–IV pedunculate at base, segment II longest, with or without small inner tooth in apical third, segment III with or without large, lateral spine, segment IV of different shape, with large sensory area at apex bearing apical psedosegment; antennae with eleven antennomeres, covered with dense setae, scape long to very long, sometimes bent, about 3.0–7.5 times longer than pedicel, club with three to four segments; neck broad.

Pronotum round, anterolateral corners completely absent, with median fovea devoid of setae, lateral foveae sparsely setose or also naked, foveae of different sizes, lacking antebasal sulcus; widest in apical third and convergent to apex. Thorax with median and lateral mesoventral foveae, with median and lateral metaventral foveae, metaventral apex broadly concave.

Elytra short, each elytron triangular, with one basal fovea; with deep discal stria extending from basal fovea and reaching apex of elytron.

Legs long and slender, protrochanter and profemora modified.

Abdomen longer than elytra, with first visible tergite (tergite IV) longer than second (tergite V), convex, lacking basal depression, carinae, sulci or foveae; paratergites VII–X well-developed.

Sexual dimorphism not apparent.

Remarks. Anagonus , Paranagonus gen. nov. and Caledonogonus gen. nov. are closely related genera and well-isolated within the Tyrina. They are characterized by the combination of the following characters: 1) head triangular; 2) rostrum relatively broad and with large impression between antennal tubercles which are distinct and prominent; 3) scape long, usually bent, three or more times longer than pedicel; 4) each elytron short and triangular, strongly expanded from base to apex; 5) shape of maxillary palpi with triangular fourth segment. Anagonus can be separated from Caledonogonus by having one basal elytral fovea, presence of lateral pronotal foveae and apical pseudosegment of maxillary palpus. Anagonus can be readily distinguished from the more closely related Paranagonus by the shape of pronotum (lacking anterior angles and rounded anterior margin) and by rounded temples.

Distribution. New Caledonia.