Euglyptus Broun, 1893

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 : 32-35

Euglyptus Broun, 1893

( Figs 1 , 16 )

Euglyptus Broun, 1893a: 1411 . Type species: Euglyptus elegans Broun,

1893a: 1412 (by monotypy).

Euglyptus : RAFFRAY (1904: 519, 550), RAFFRAY (1908: 36, 51), RAFFRAY

(1911: 14); HUTTON (1904: 176); HUDsON (1923: 364); NEWTON &

CHANDLER (1989: 21); KLlMAsZEWsKl et al. (1996: 147); NOMURA &

LEsCHEN (2006: 247, Figs 26, 27).

Microtyrus Broun, 1893a: 1413 . Type species: Microtyrus punctatus

Broun, 1893a: 1413 (by monotypy).

Microtyrus : RAFFRAY (1904: 550, new synonymy); HUTTON (1904: 176);

HUDsON (1923: 364); KUsCHEL (1990: 28).

Diagnosis. Body color and antenna blackish-brown or reddish-brown, usually three distal antennomeres lighter than preceding antennomeres, leg reddish-brown or yellowish- -brown, maxillary palpus and tarsus yellowish-brown, body moderately pubescent ( Figs 1A–D ). Head widest across eyes, with distinct antennal tubercles and deep impression between antennal tubercles, ridge of antennal tubercles extends to eyes, deep impression present between ridges, deep impression narrowing from middle to anterior margin, with dorsal tentorial pits in circular impressions, size of dorsal tentorial pits variable, area between dorsal tentorial pits convex, in lateral view head appearing flattened and concave in middle, with ventral tentorial pits, with ocular-mandibular carinae, with gular carina extending to mouthparts; rostrum narrower than head ( Figs 1A–B, E ). Antennal scape large, 1.5 times as long as pedicel, antennal club formed by apical three antennomeres, antennomere X broadest near apex or globular in shape, antennomere XI longer than wide, cone shaped ( Fig. 1E ). Pronotum subhexagonal, broadest in middle or in anterior 1/3; transverse antebasal sulcus narrowly to broadly connected lateral antebasal foveae and median antebasal fovea, with shallow to deep median longitudinal sulcus, area around median antebasal fovea deeply impressed, area around lateral antebasal foveae deeply impressed, foveae setose or asetose ( Fig. 1A ). Prosternum with distinct median prosternal carina and lateral procoxal foveae ( Figs 1B, F ). Mesoventrite gradually widening to posterior margin, with median mesoventral fovea, with lateral mesoventral foveae, with lateral mesocoxal foveae ( Figs 1B, G ). Metaventrite gradually widening to posterior margin, with lateral mesocoxal foveae, with lateral metaventral foveae ( Figs 1B, G ). Elytra wider than pronotum, longer than wide ( Fig. 1A ); each elytron with four basal elytral foveae, rounded transverse ridge often present in front of foveae, discal stria short, reaching half of elytral length, with subhumeral fovea, lateral stria entire, extending from subhumeral fovea and reaching posterior margin of elytra, with distinct cleft in lateroposterior ( Figs 1A, H ). Abdomen gradually narrowing toward base ( Figs 1A–B, I–J ); abdominal tergite IV–VII subequal in length, IV slightly longer, with basolateral foveae and short discal striae, median impression between striae variable in width ( Figs 1A, J ); abdominal sternite IV longest, with basolateral foveae, with strong median transverse impression between basolateral foveae, sternites V–VIII subequal in length, lacking species-specific characters ( Figs 1B, I ). Median lobe and parameres asymmetric; phallobase with diaphragm and basal stem; median lobe with movable structure.

Sexual dimorphism. Males with a penial plate (ventrite 7 / abdominal sternite IX), females lack a penial plate; male with compound eyes large, with approximately 30–40 facets, female compound eyes smaller, with approximately 8–10 facets ( Figs 1C–D ; red arrows); male wings well developed, female wings lacking.

Distribution. New Zealand ( Fig. 16 ).

Figures

Fig. 1. Characters of Euglyptus Broun, 1893 (based on E. elegans Broun, 1893). A – male habitus dorsal view; B – male habitus ventral view; C – male head lateral view; D – female head later view; E – head; F – prosternum; G – meso- and metaventrite; H – elytra; I – abdominal sternites; J – abdominal tergites. Abbreviations: abs – abdominal sternite, abt – abdominal tergite, bef – basal elytral fovea, blf – basolateral fovea, ds – discal stria, dtp – dorsal tentorial pit, gc – gular carina, laf – lateral antebasal fovea, lmcf – lateral mesocoxal fovea, lmsf – lateral mesoventral fovea, lmtf – lateral metaventral fovea, lpcf – lateral procoxal fovea, ls – lateral stria, maf – median antebasal fovea, mls – median longitudinal sulcus, mmsf – median mesoventral fovea, mpc – median prosternal carina, msv – mesoventrite, mtv – metaventrite, ps – prosternum, shef – subhumeral elytral fovea, ss – sutural stria, t – tergite, v – ventrite, vtp – ventral tentorial pit.

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