Euglyptus dunedinensis 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 : 40-42

Euglyptus dunedinensis Byeon & Chandler , sp. nov. ( Figs 5 , 16 )

Type material. HOLOTYPE: J (genitalia dissected), “ NEW ZEALAND DN Moodside Glen crest of spur 200m 20 Oct 1981 // J.C.Watt Sifted litter 81/108” ( NZAC, NZAC 04261172). PARATYPEs: NEW ZEALAND: SOUTH ISLAND: DN [Dunedin]: Wangaloa Open Cast Mine Rd 17 Jun 2010 // Washed soil sample. kamahi forest (1 J abdomen lost; JTN).

Diagnosis. Males of this species can be distinguished from other Euglyptus species by the following combination of characters: body 1.44–1.54 mm (forebody 1.09–1.11 mm) ( Fig. 5A ); antennomeres X wider than long, widest at apex, as wide as XI ( Fig. 5C ); pronotum gradually widening from anterior margin to middle, widest in middle, gradually narrowing from middle to posterior margin, with broad transverse antebasal sulcus ( Fig. 5B ); abdominal tergite V with short, shallow discal striae, distance between discal striae of V narrow ( Fig. 5D ); parameres nearly as long as median lobe, left paramere slightly and broadly convex in middle, apex acute and slightly curved ventrally, with rounded apical margin in ventral view, right paramere with apex abruptly broadened to form dorsal, apical, ventral points in lateral view; median lobe with complex structure, small branch extends from point of apical 1/3, apex of small branch with sharply bifurcate apophysis, median lobe with two acutely pointed lateral apophyses in addition to median longer apophysis ( Figs 5E–J ).

Description. Body 1.44–1.54 mm (forebody 1.09–1.11 mm); head and thorax coarsely punctate; head, thorax, abdomen, elytra, leg, and antennal scape reddish-brown; pedicel and antennomeres III–VIII lighter than reddish- -brown; tarsus, maxillary palpus, and antennomeres IX–XI yellowish-brown ( Fig. 5A ).

Head wider than long, with small dorsal tentorial pits, weak impression 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 0.6 times as wide as antennal tubercle diameter. Pedicel wider than antennomeres III–VIII, antennomeres III–V subrectangular, VI as long as wide, VII larger than VI, VIII smallest, IX as long as wide, subhexagonal, X wider than long, widest at apex, as wide as XI ( Figs 5A, C ).

Pronotum as wide as head, longer than wide, narrowest at apex, gradually widening from anterior margin to middle, widest in middle, gradually narrowing from middle to posterior margin, with median longitudinal sulcus and broad transverse antebasal sulcus ( Fig. 5B ).

Elytra without any distinguishing characters ( Fig. 5A ).

Abdominal tergite V with short, shallow discal striae, distance between discal striae of tergite V narrow ( Fig. 5D ).

Male genitalia. Parameres nearly as long as median lobe, left paramere slightly and broadly convex in middle, apex acute and slightly curved ventrally, with rounded apical margin in ventral view, right paramere with apex abruptly broadened to form dorsal, apical, ventral points in lateral view; median lobe with complex structure, small branch extends from point of apical 1/3, apex of small branch with sharply bifurcate apophysis, median lobe with two acutely pointed lateral apophyses in addition to median longer apophysis ( Figs 5E–J ).

Etymology. The specific epithet is a Latinised adjective based on the Crosby code for the region of the type locality, Dunedin.

Distribution. New Zealand (South Island: DN; Fig. 16A )

Figures

Fig. 5. Euglyptus dunedinensis 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.