Euglyptus latefossatus Byeon & Chandler, 2025

Byeon, Ui-Joung, Chandler, Donald S., Leschen, Richard A. B. & Park, Jong-Seok, 2025, Revision of the New Zealand genus Euglyptus (Coleoptera: Staphylinidae: Pselaphinae) with eight new species, Acta Entomologica Musei Nationalis Pragae 65 (1), pp. 31-59 : 46-48

Euglyptus latefossatus Byeon & Chandler , sp. nov.

( Figs 8 , 16 )

Type material. HOLOTYPE: J (genitalia dissected), “ Lake Hauroko 1369 13/4 1952 R.Hornabrook [ 1369 13/4 1952 handwritten]” ( NZAC, NZAC04261379 ) . PARATYPEs: NEW ZEALAND: SOUTH ISLAND: DN [Dunedin]: Mt Cargill, 400m 21 Oct 1981 J.C.Watt.Sifted litter 81/109 (1 J slide mounted; NZAC). SD [ Marlborough Sounds]: Tennyson Inlet, west side Te Mako Bay, 125m 15.xii.1984 - 5.i.1985 Nothofagus- -podo-hdwd. A.Newton/M.Thayer 710 // flight intercept (window) trap (1 J slide mounted, 1 J genitalia dissected, aedeagus lost; FMNH). SL [ Southland]: Princhester Base Hut, Takitimu Forest 4/6/07 // Washed soil sample beech forest 425 m (1 J genitalia dissected, 2 ♀♀; JTN).

Diagnosis. Males of this species can be distinguished from other Euglyptus species by the following combination of characters: body 1.43–1.47 mm (forebody 1.07–1.09 mm) ( Fig. 8A ); antennomere X wider than long, widest at apex, as wide as XI ( Fig. 8C ); pronotum gradually widening from anterior margin to middle, widest in middle, gradually narrowing from middle to posterior margin, with shallow median longitudinal sulcus, broad transverse antebasal sulcus connecting median antebasal fovea to lateral antebasal foveae ( Fig. 8B ); both parameres similar in length, both slightly curved to apex, left paramere moderately wide, curving to right apically to form broadly truncate apex, in dorsal view with apex expanded to form large lateral and median tubercles, in lateral view with apex abruptly curved to acute point, right paramere in ventral view with thin acutely pointed apophysis evenly narrowing to apex, apex slightly curved ventrally in lateral view; median lobe longer than parameres, with elongate and acutely pointed apophysis extending from base, median lobe with major portion of even width in lateral view, forming laterally flattened lobe with apical part slightly twisted ( Figs 8E–J ). Description. Body 1.43–1.47 mm (forebody 1.07–1.09 mm); head and thorax impunctate; head, thorax, elytra, abdomen, antennae, and leg reddish-brown; tibia, tarsus, and maxillary palpus lighter ( Fig. 8A ).

Head as wide as long, with small dorsal tentorial pits, impression weakly defined around dorsal tentorial pits; temples gradually narrowing toward posterior margin of head capsule, with several setae; impression between antennal tubercles narrow, width of impression approximately 0.7 times as wide as antennal tubercle diameter. Pedicel wider than antennomeres III–VIII, antennomeres III longer than wide, IV as long as wide, V longer than wide, VI as long as wide, VII slightly larger than VI, VIII smallest, IX as long as wide, subhexagonal, X wider than long, widest at apex, as wide as XI ( Figs 8A, C ).

Pronotum wider than head, longer than wide, narrowest at apex, gradually widened from anterior margin to middle, widest in middle, gradually narrowing from middle to posterior margin, with shallow median longitudinal sulcus and transverse antebasal sulcus ( Fig. 8B ).

Elytra and abdominal tergites without any distinguishing characters ( Figs 8A, D ).

Male genitalia. Both parameres similar in length, both slightly and broadly curved to apex, left paramere in ventral view slightly curved to right, forming elongate neck with broadly truncate apex, in lateral view subtriangular, apically narrowing abruptly deflexed and acute point, right paramere thin and elongate with acutely pointed apex, apex slightly curved ventrally in lateral view; main portion of median lobe longer than parameres, with elongate and acutely pointed dorsal apophysis extending from base, larger portion laterally flattened, moderately wide and of evenly decreasing width to broadly rounded apex, apex slightly twisted in dorsal view ( Figs 8E–J ).

Etymology. The specific epithet is an adjective combining the Latin words latus, -a, -um (“broad”) and fossa, ae, f (“ditch”) referring to the broad transverse antebasal sulcus of the pronotum.

Distribution. New Zealand (South Island: DN, FD, SD, SL; Fig. 16B ).

Figures

Fig. 8. Euglyptus latefossatus sp. nov. A – habitus dorsal view; B – pronotum; C – apical antennomeres; D – abdominal tergites IV–V; E, F – aedeagus ventral view; G, H – aedeagus lateral view; I, J – aedeagus dorsal view. Scale bars: A = 1 mm; B–J = 0.1 mm.

Fig. 16. Collection localities of New Zealand for Euglyptus species.