Euglyptus punctatosimilis 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 : 49-50

Euglyptus punctatosimilis Byeon & Chandler , sp. nov.

( Figs 11 , 16 )

Type material. HOLOTYPE: J (genitalia dissected), “Rarangi Marlb.2.ix.69 G. Kuschel // 69/149” ( NZAC, NZAC04261157 ) . PARATYPEs: NEW ZEALAND: NORTH ISLAND: WN [ Wellington]: Keith George Res Silverstream 18-IV-1982 (2 JJ genitalia dissected; JTN). Elsdon camp Porirua 29.5.87 T.Nunn [handwritten] // leaf litter [handwritten] (1 J genitalia dissected; JTN). 614 // Tinakori Hill Wellington 27.5.87 T.Nunn // Ant: Mesoponera // Associated ant (1 J ant card mounted on second card, genitalia dissected; JTN). 614 // Karori Reservoir 16-Oct-94 // In forest leaf litter (1 J genitalia dissected; JTN).Karori Reservoir 13-Apr- 97 // Under embedded rock (1 J genitalia dissected; JTN). Johnson’s Hill Karori 17.7.88 [handwritten] (1 J slide mounted; JTN). SOUTH ISLAND: KA [Kaikoura]: Okarahia Stm Hundalees 25-Sep-97 (1 J genitalia dissected; JTN). Mt Fyffe, Hinau Tk, 5 Apr 2004, R. Leschen, RL846, 42.01’S, 173.35’E” ( 1 ♀; NZAC). NN [ Nelson]: Slaters Road, 0.7km s Whangamoa Saddle, 410m 13.xii.1984 - 4.i.1985 Nothofagus spp forest A.Newton/M.Thayer 703 // flight intercept (window) trap (1 J genitalia dissected, 1 J; FMNH). SD [ Marlborough Sounds]: same locality as holotype // Litter (1 J genitalia dissected, 1 J slide mounted; NZAC).

Diagnosis. Males of this species can be distinguished from other Euglyptus species by the following combination of characters: body 1.37–1.41 mm (forebody 1.07–1.09 mm) ( Fig. 11A ); antennomere X wider than long, subpentagonal, slightly narrower than XI ( Fig. 11C ); pronotum gradually widening from anterior margin to middle, widest in middle, gradually narrowing from middle to posterior margin, with median longitudinal sulcus and transverse antebasal sulcus, with short median antebasal carina from median antebasal impression to posterior margin ( Fig. 11B ); both parameres similar in length, left paramere apex expanded and curved to right in ventral view, right paramere gradually narrowing toward apex, slightly curved ventrally in lateral view to pointed apex; median lobe longer than parameres, curved dorsally, with serrate structure near apex, apex slightly curved laterally ( Figs 11E–J ).

Description. Body 1.37–1.41 mm (forebody 1.07–1.09 mm); head and thorax impunctate; head, thorax, abdomen, and antennal scape reddish-brown; elytra, leg, pedicel, and antennomeres III–XI lighter; tarsus and maxillary palpus yellowish-brown ( Fig. 11A ).

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 broad, width of impression approximately as wide as diameter of one antennal tubercle. Pedicel wider than antennomeres III–VIII, antennomeres III–V subrectangular, 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, subpentagonal, slightly narrower than XI ( Figs 11A, C ).

Pronotum as wide as head, as long as 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 transverse antebasal sulcus, with short median antebasal carina extending from median antebasal impression to base ( Fig. 11B ).

Elytra and abdominal tergites without any distinguishing characters ( Figs 11A, D ).

Male genitalia. Both parameres similar in length, apex of left paramere expanded and curved to right in ventral view, right paramere gradually narrowing toward apex, apex curved ventrally in lateral view; median lobe longer than parameres, curved dorsally, with serrate structure near apex, apex slightly curved laterally ( Figs 11E–J ).

Etymology. The specific epithet refers to similarly punctate species, Euglyptus punctatus , being composed of Latin words punctatus (- a, - um) and similis (- is, - e); an adjective. Distribution. New Zealand (North Island: WN, South Island: KA, NN, SD; Fig. 16C ).

Figures

Fig.11. Euglyptus punctatosimilis 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.