Euglyptus waimatensis 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 : 56-58

Euglyptus waimatensis Byeon & Chandler , sp. nov.

( Figs 15 , 16 )

Type material. HOLOTYPE: J (genitalia dissected), “ New Zealand SC Gunns Bush Waimate 23-Dec-06 // Washed soil sample broadleaf forest” ( JTN).

Diagnosis. Males of this species can be distinguished from other Euglyptus species by the following combination of characters: forebody 1.15 mm; antennomere V distinctly longer than IV, X wider than long, widening to apex, slightly narrower than XI ( Figs 15A, C ); pronotum gradually widening from anterior margin to middle, widest before middle, gradually narrowing from widest point to posterior margin, with median longitudinal sulcus and transverse antebasal sulcus, with median antebasal carina extending from median antebasal impression to posterior margin ( Fig. 15B ); both parameres similar in length, left paramere with apical portion expanded as flat lobe, in lateral view curved ventrally to blunt point, right paramere narrow and sinuate, slightly curved ventrally; median lobe slightly twisted at base, strongly angled to left in ventral view, elongate and narrow, curved evenly dorsally in lateral view to narrow apex, apex with flat apical lobe directed medially in dorsal or ventral views ( Figs 15E–J ).

Description. Body 1.42 mm (not including abdominal tergites VII–VIII, removed due to dissection; forebody 1.15 mm); head and thorax impunctate; head, thorax, abdomen, and antennal scape reddish-brown; elytra, leg, pedicel, and antennomeres III–VIII lighter; tarsus, maxillary palpus, and antennomeres IX–XI yellowish-brown ( Fig. 15A ).

Head wider than 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 between antennal tubercles approximately 0.6 times as wide as antennal tubercle diameter. Pedicel wider than antennomeres III–VIII, antennomeres III slightly longer than wide, subrectangular, IV as long as wide, V longer than wide, rectangular, VI–VII as long as wide, subquadrate, VIII smallest, IX as long as wide, subhexagonal, X wider than long, widening to apex, slightly narrower than XI ( Figs 15A, C ).

Pronotum slightly wider than head, longer than wide, narrowest at anterior margin, gradually widening from anterior margin to middle, widest before to middle, gradually narrowing from widest region to posterior margin, with median longitudinal sulcus and transverse antebasal, with median antebasal carina extending from median antebasal impression to posterior margin ( Fig. 15B ).

Elytra and abdominal tergites without any distinguishing characters ( Figs 15A, D ).

Male genitalia. Both parameres similar in length, left paramere with apical portion expanded as flat lobe, in lateral view curved ventrally to blunt point, right paramere narrow and sinuate, slightly curved ventrally, median lobe slightly twisted at base, strongly angled to left in ventral view, elongate and narrow, curved evenly dorsally in lateral view to narrow apex, apex with flat apical lobe directed medially in dorsal or ventral views ( Figs 15E–J ).

Etymology. The specific epithet is a Latinised adjective based on the type locality, Waimate.

Distribution. New Zealand (South Island: SC; Fig. 16D ).

Figures

Fig. 15. Euglyptus waimatensis 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.