Euglyptus boreus 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 : 38-39

Euglyptus boreus Byeon & Chandler , sp. nov.

( Figs 4 , 16 )

Type material. HOLOTYPE: J (genitalia dissected), “ NEW ZEALAND ND Waipoua SF Te Matua Ngahere 31 Oct 1985 R.C.Craw // Sifted litter 85/51” ( NZAC, NZAC 04261385). PARATYPEs. NEW ZEALAND: NORTH ISLAND: AK [Auckland]: Waitakere Range, 260m, Nohoanga Scenic Reserve, 23.xi-8.xii.1984 hdwd.-podocarp forest A.Newton/M. Thayer 679 // flight intercept (window) trap (1 J genitalia dissected, 1 J; FMNH).Waitakere Ra.,Cascade-Kauri Park,Anderson Tr., 85m, 23.xi-8. xii.1984, hdwd.-podocarp A.Newton/M.Thayer 681 // Window trap (1 J genitalia dissected; FMNH). Waitakere Ranges Reg. Pk., Upper Huia Reser. Track, II-28-2010. // 4.3 km SW Waiatarua 277 m, D.S. Chandler sift leaf litter at base of Cyathea (1 J; DSC). Same locality data, except sift forest litter (1 J slide mounted; DSC). BP [Bay of Plenty]: Papatea 24 Sep 19 Oct 1992 // J.S. Dugdale Malaise trap (1 J genitalia dissected; NZAC). Mt. Te Aroha, 2.5 km SE Te Aroha, 390 m Tui Road at Tui Creek Mt. Domain Track, II-15-2010, D.S. Chandler sift forest leaf litter (1 J genitalia dissected; DSC). Lake Okataina 9 Oct 1995 M-C Lariviere & A Larochelle // Litter 92/12 (1 J genitalia dissected; NZAC). Kaimai Ra 427m Leyland Tramline 22 Sep 1981 B.M.May // Litter 81/92 (1 ♀; NZAC). P149 [to left of specimen]. 51 moss, Waira, orua, N.I // 23.vii.51 moss, Te Wairau, Rotorua, N.I., N.Z [handwritten] (1 J genitalia dissected; NZAC). CL [Coromandel]: Coromandel 350m 23 Mar 1977 G.Kuschel [handwritten] // moss & lichens all ridge track (1 J; NZAC). ND [Northland]: Mangamuka Gorge S.R., 6.6km nw Mangamuka, 70m, 25.xi-5.xii.1984 hdwd.-podocarp forestA.Newton/M. Thayer 682 // flight intercept (window) trap (1 J; FMNH).Mangamuka Summit, 12.9km nw Mangamuka, 400m, 25.xi-5.xii.1984 hdwd.-podocarp forest A.Newton/M.Thayer 683 // flight intercept (window) trap (1 J genitalia dissected; FMNH / 1 J; NZAC). Omahuta Forest, Oma- huta Kauri Sanctuary, 340m, 29.xi.1984 kauri-podocarp-hdwd.A.Newton/M. Thayer 693 // berl. Leaf & log litter forest floor (1 J genitalia dissected; DSC).Waipoua State Forest, Kauri Ricker Track, 120m, 26.xi-4.xii.1984 kauri-podocarp-hdwd.A.Newton/M.Thayer 684 // flight intercept (window) trap (3 JJ genitalia dissected; FMNH / 1 J genitalia dissected; DSC). Waipoua State Forest, Toronui Track, 120m 26.xi-4.xii.1984 kauri-podocarp-hdwd.A.Newton/M.Thayer 685 // flight intercept (window) trap (1 J; FMNH). Waipoua State Forest, 0.9km e Forest Hqtrs. 120 m, 26.xi-4.xii.1984 hdwd.-podocarp forest A.Newton/M.Thayer 686 // (flight intercept (window) trap (1 J; DSC). Waipoua State Forest, Wairau Summit, 400m 27.xi-6.xii.1984 hdwd.-podocarp forestA.Newton/M.Thayer 687 // flight intercept (window) trap (1 J slide mounted, 1 J genitalia dissected, 5 JJ; FMNH). Waipoua State Forest, vic. Wairau Summit, 460m, 27.xi-4.xii.1984 hdwd.-podocarp forest A.Newton/M.Thayer 688 // flight intercept (window) trap (1 J slide mounted, 1 J genitalia dissected, 3 JJ; FMNH). Waipoua State Forest, 0.8km nw Wairau Summit 350m, 27.xi-6.xii.1984 hdwd.-podocarp forest A.Newton/M.Thayer 689 // flight intercept (window) trap (4 JJ; FMNH). Waipoua State Forest, Waikohatu Stream bridge 300m, 28.xi-6.xii.1984 kauri-hdwd.-podocarp A.Newton/M.Thayer 690 // flight intercept (window) trap (4 JJ; FMNH / 1 J; NZAC). Wai-poua St. For., 1.7km nw Waikohatu Stream bridge 380m, 28.xi-6.xii.1984 hdwd.-podocarp forest A.Newton/M.Thayer 691 // flight intercept (window) trap (2 JJ; FMNH). Oma-huta For.,Picnic Area near Kauri Sanctuary, 330m, 29.xi-5.xii.1984 2º hdwd.-podocarp for A.Newton/M.Thayer 694 // flight intercept (window) trap (2 JJ; FMNH).Trounson Kauri Park, 250m, 3-7.xii.1984 kauri-podocarp-hdwd. A.Newton/M.Thayer 698 // berl, leaf & log litter, forest floor (2 JJ; FMNH).Waipoua SF, Kauri Ricker Tr. 100m 11-15.iv.80 kauri-podocarp-broadleaf A.Newton,M.Thayer // berl, leaf & log litter, forest floor (1 J slide mounted, 1 J genitalia dissected, 1 ♀; FMNH).Waipoua SF,Yakas Tree Tr. 350m 11-14.iv.1980 broadlf.-podocarp A.Newton,M.Thayer // berl, litter at bases of Metrosideros robusta trunks (2 JJ genitalia dissected, 1 ♀; FMNH). Waipoua SF Toronui Track 30 Oct 1980 G.Kuschel // Sifted decayed wood 80/96 (3 JJ genitalia dissected, 1 J; NZAC). Waipoua SF, 290m Waikohatu Bridge 14 Apr 1980 J.C.Watt // Litter 80/53 (1 J, 1 ♀; NZAC). Waipoua SF, Waikohatu Br. 290m 11-14.iv.80. Agathis-podocarp-broadlf.A.Newton,M.Thayer (1 J genitalia dissected; FMNH).Waipoua SF Toatua Grove 25 Nov 1980 G.Kuschel // Plants and litter 80/117 (1 J; NZAC). Waipoua SF, 100m Kauri Ricker TK 13 Apr 1980 J.C.Watt // Sifted litter 80/49 (1 ♀; NZAC). Waipoua SF Tanemahuta 29 Oct 1985 R.C.Craw & // C.Lyal Sifted litter 85/48 (1 J; NZAC). TO [Taupo]: Ohakune 26 Jan 1982 C.F.Butcher // Sifted litter 81/14 (1 J genitalia dissected; NZAC). WA [Wairarapa]: makaui n.sp. [handwritten, illegible] (1 J genitalia dissected; NZAC). WO [Waikato]: Maungatautari Main-land Reserve, XI-15-2007, S.A.Forgie litter (1 J genitalia dissected; NZAC). Piripiri Caves Reserve 25 May 1986 C.L. Lyal // Leaf litter CL 480 (1 J genitalia dissected; NZAC).

Diagnosis. Males of this species can be distinguished from other Euglyptus species by the following combination of characters: body 1.21–1.29 mm (forebody 0.92–0.96 mm) ( Fig. 4A ); antennomere X wider than long, widest at apex, as wide as XI ( Fig. 4C ); pronotum 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. 4B ); both parameres slightly to strongly curved ventrally, left paramere slightly convex at apex in lateral view, right paramere nearly as broad as median lobe in ventral view, strongly curved ventrally in lateral view; median lobe curved dorsally, small branch extends from apical fifth, small branch with sharply bifurcate apophysis at apex arising near base of median lobe, apices of branch acutely pointed ( Figs 4E–J ).

Description. Body 1.21–1.29 mm (forebody 0.92–0.96 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. 4A ).

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; width of impression between antennal tubercles narrow, approximately 0.7 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–VIII as long as wide, subquadrate, IX as long as wide, subhexagonal, X wider than long, widest at apex, as wide as XI ( Figs 4A, C ).

Pronotum slightly wider than head, as wide as long, 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. 4B ).

Elytra and abdominal tergites without any distinguishing characters ( Figs 4A, D ).

Male genitalia. Both parameres slightly to strongly curved ventrally, left paramere slightly convex at apex in lateral view, right paramere nearly as broad as median lobe in ventral view, strongly curved ventrally in lateral view; median lobe curved dorsally, small branch extends from apical fifth, small branch with sharply bifurcate apophysis at apex arising near base of median lobe, apices of branch acutely pointed ( Figs 4E–J ).

Etymology. The specific epithet is a Latin adjective meaning ʻnorthernʼ, referring to the distribution of this species being limited to the North Island.

Distribution. New Zealand (North Island: AK, BP, CL, ND, TO, WA, WO; Fig. 16D ).

Figures

Fig. 4. Euglyptus boreus 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.