Euglyptus elegans 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 : 42-46

Euglyptus elegans Broun, 1893

( Figs 6 , 16 )

Euglyptus elegans Broun, 1893a: 1412 (#2460). Type locality: Maketu, Hunua Range [AK].

Euglyptus elegans : RAFFRAY (1904: 550), RAFFRAY (1908: 52), RAFFRAY (1911: 14); HUTTON (1904: 176); HUDsON (1923: 364); NEWTON & CHANDLER (1989: 21); NOMURA & LEsCHEN (2006: 247).

Euglyptus costifer Broun, 1893b: 166 (#2725). Type locality: Mount. Pirongia [WO]; syn. nov.

Euglyptus costifer : RAFFRAY (1904: 550), RAFFRAY (1908: 52), RAFFRAY (1911: 14); HUTTON (1904: 176); HUDsON (1923: 364); NOMURA & LEsCHEN (2006: 247).

Type material. Euglyptus elegans . HOLOTYPE: J, “[red-bordered disc] Type / 2460. / Hunua / New Zealand [with red underline] Broun Coll.Brit. Mus. 1922-482. / Euglyptus elegans ” ( BMNH, NHMUK015534121 ).

Euglyptus costifer . LECTOTYPE (by present designation): “[red-bordered disc] Type / 2725./ Pirongia / New Zealand [with red underline] Broun Coll. Brit. Mus. 1922-482. / Euglyptus costifer- / [yellow label] LECTOTYPE Euglyptus c ostifer Broun sel. D.S. Chandler ‘24” ( BMNH, NHMUK015534120 ).

Additional material examined. NEW ZEALAND: NORTH ISLAND: AK [ Auckland]: Kepa Bush Reserve, II-9-2010 20 m, D.S Chandler, sift leaf litter along stream // Compared with type of Broun Euglyptus costifer 15 by Chandler [green label] ( 1 ♀; DSC). Waharau Regional Pk. nr. Waihihi Stream, 1.5 km W park entrance 56 m, IIII-13-2010, D.S. Chandler, sift leaf litter along stream // Compared with type of Broun Euglyptus elegans 15 by Chandler [green label] (1 J genitalia dissected; DSC). Waitakere Ra Cascades 24 Jul 1979 // J.C.Watt and C.Gnanasunderam litter 79/85 ( 1 ♀; NZAC). Hunua Ranges Reg. Park, 7 km W Kaiaua Workman Track, 116m, III-27-2010 D.S. Chandler, sift leaf litter near stream ( 1 ♀; DSC). Goldie Bush Scenic Res., Mokoroa Falls Track, 6 km W Waitakere, III- 28-2010, 106m D.S. Chandler, rotten wood & branch debris ( 1 ♀ slide mounted; DSC). Murphys Bush, 39 m, 5 km NE Manukau, III-19-2010, D.S. Chan- dler & K.P. Puliafico (1 J; DSC). BP [ Bay of Plenty]: Collector 14-3-1920 A. E. Brookes // Okauia Kaimai R. Matamata // A.E.Brookes Collection (1 J genitalia dissected; NZAC). Orete Forest Te Puia Hut 13 Apr 1992 G. Hall // Litter 92/43 (2 JJ 1 ♀; NZAC). Lottin Pt Rd Waenga Bush 16 Sep 1992 R.C. Henderson // Sifted litter 92/51 // Duplicate specimens in alcohol ( 1 ♀; NZAC). Raukumara Ra Matu Rd, 600m 27 Feb 1979 B.M.May // Litter 79/35 ( 1 ♀; NZAC). Mt. Te Aroha, 2.5 km SE Te Aroha, 390 m Tui Road at Tui Creek Mt. Domain Track, II-15-2021, D.S. Chandler sift forest leaf litter (1 J; DSC). Mamaku Bush 11-1-31 // A.E.Brookes Collection (2 JJ, two cards mounted on one pin; NZAC). CL [Coromandel]: Gt Barrier I Mt Hobson Upper Kauri Dam 11Apr 1982 // Moss and Litter 82/51 (1 J genitalia dissected; NZAC). Tapu/Coroglen Rd smt, 21.11.95 // In forest litter (1 J; JTN). S. Coromandel Ra Headwaters of Grace Darling Stm 1 Dec 1988 // G.W. Ramsay Litter 88/1 // Duplicate specimens in alcohol (1 J slide mounted; NZAC). GB [ Gisborne]: East Cape Taikawakawa Bush 15 Apr 1992 G.Hall // Litter 92/45 ( 1 ♀; NZAC). HB [ Hawkes Bay]: Balls Clearing 24 Jan 1985 J.G. Charles Litter (1 J genitalia dissected, 1 J, 1 ♀; NZAC). ND [Northlnad]: Wairua Falls 8-5-21 // A.E.Brookes Collection (1 J; NZAC). Mataroa, main Trunk Line, N. IS. // Coll. J.Ford. 24-8-1917.// 2460 // Euglyptus elegans Broun. // A.E.Brookes Collection (1 J; NZAC). RI [Rangitikei]: Ruahine Ra Triplex 10 Feb 1980 C.F.Butcher // Litter 80/16 (1 J genitalia dissected; NZAC). Ruahine Range Shuteye 9 Feb 1980 C.Butcher // Litter and moss 80/10 ( 1 ♀; NZAC). TK [ Taranaki]: 1534 // Dawsons Falls 400m Egmont 2 Jan 90 (1 J genitalia dissected; JTN). TO [Taupo]: Kaimanawa SF 26 Mar 1978 S.B.&J.Peck Litter // S. & J. Peck Collection (1 J genitalia dissected; NZAC). Waikato-Waipakihi Junction, 32km S of Turangi, 915m 19 Feb 1979 // J.S. Dugdale mosses liverworts and litter 79/23 (1 J genitalia dissected, 1 ♀; NZAC). Waikato-Waipakihi Junction 3km S of Turangi 915m // 19 Feb 1979 L.A. Nound Litter 79/22 ( 1 ♀; NZAC). WN [ Wellington]: Tunnel Gulley The Plateau 28-Oct-96 // In forest litter near stream (1 J; JTN). Days Bay 26.6.88 (1 J; JTN). Pakuratahi Forks 1 Jun 1992 (1 J genitalia dissected; JTN). Johnson’s Hill Karori 21.7.88 (1 J genitalia dissected; JTN). 1152 1/1 1950 R.Hornabrook (1 J genitalia dissected, 4 ♀♀; NZAC). 1027 14/4 1949 R.Hornabrook (1 J genitalia dissected; NZAC). Orongorongo Res. Stn 700’ 21.v.69 J.S. Dugdale // Litter (1 J; NZAC). Pakuratahi Forks Kaitoke 27-Apr-97 // In forest leaf litter (1 J slide mounted; JTN).Akatarawa Saddle 11 XI 2015 // Forest floor litter,broadleaf forest.J Nunn (1 J slide mounted; JTN). WO [ Waikato]: mt. Pirongia King country. North Is. // Ex.Broun collection. // Euglyptus costifer Broun. // 2725 // T.Broun Colleion // A.E.Brookes Collection //Possible Broun SYNTYPE Euglyptus Costifer D S Chandler 2010 [green label] ( 2 ♀♀; NZAC). Mt. Pirongia Wharauroa, 854m 9 Jun 1977 B.M.May // Swept on grossy knob (1 J; NZAC). Wairangi, Waikato, Nichal, May - 31 [handwritten] ( 1 ♀; NZAC). South Island: BR [Buller]: Nelson Lks.NP, St.Arnaud Tr.,L.Rotoiti 610-650m 24-26. iii.80 Nothofagus spp. A .Newton,M.Thayer // flight intercept (window) trap (1 J genitalia dissected; FMNH). NN [ Nelson]: 26-3-24 E.S.Gourlay. // E. S. Gourlay Aco. 1970 Ent. Div. (1 J genitalia dissected; NZAC). Upper Maitai 3.5.50. E.S.Gourlay. (1 J genitalia dissected 1 ♀, three individuals on one pointing and middle species not Euglyptus ; NZAC). Upper Maitai.13.2.57 E.S.Gourlay ( 1 ♀; NZAC).Upper Maitai. 11.3.49 E.S.Gourlay. // E. S. Gourlay Aco. 1970 Ent. Div. ( 1 ♀; NZAC). Dun Track 701m NN 3 Feb 62 E.S. Gourlay (1 J genitalia dissected; NZAC). SD [ Marlborough Sounds]: Tennyson Inlet, east side Duncan Bay, 30m 15.xii.1984 - 5.i.1985 podo.- Nothofagus for. A.Newton/M.Thayer 709 // flight intercept (window) trap (1 J; FMNH). Totaranui Saddle 27.9.51. E.S.Gourlay.[handwritten, illegible] (1 J genitalia dissected; NZAC). SI [Stewart Island]: Codfish I 25 Nov 1981 B.A.Holloway // Under bark dead fallen Dacrydium cupressinum (1 J genitalia dissected; NZAC).

Diagnosis. Males of this species can be distinguished from other Euglyptus species by the following combination of characters: body 1.80–1.90 mm (forebody 1.30–1.40 mm), head and thorax densely punctate (distance between punctures approximately two punctures in diameter) ( Fig. 6A ); antennomere X wider than XI, widening to apex ( Fig. 1E ); pronotum gradually widening from anterior margin to middle, widest in middle, gradually narrowing from middle to posterior margin, with distinct median longitudinal sulcus and narrow transverse antebasal sulcus ( Figs 1A , 6A–B ); each elytron with discal stria remote from second inner fovea reaching posterior margin ( Figs 1H , 6A ); abdominal tergite V with distinct discal striae,

distance between discal striae narrow than discal striae of tergite IV ( Fig. 1J ); parameres dissimilar in length, left paramere curved toward middle in ventral view, in lateral view straight with apex abruptly directed ventrally, distinctly longer than right paramere; right paramere slender and sharply pointed, with short apophysis visible at base in lateral view; median lobe with apex fan-shaped, curved dorsally ( Figs 6C–H ).

Redescription. Body 1.80–1.90 mm (forebody 1.30–1.40 mm); head and thorax densely punctate (punctures separated as wide as diameter); head, thorax, and abdomen darkish-brown; elytra, leg, and antenna reddish-brown; tarsus and maxillary palpus yellowish-brown ( Figs 1A–B , 6A ).

Head wider than long, with large and distinct dorsal tentorial pits, strong impression around dorsal tentorial pits ( Fig. 1E ); temples gradually narrowing toward posterior margin of head capsule, with several setae; distance between antennal tubercles narrower than antennal tubercle diameter ( Fig. 1E ). Pedicel longer and wider than antennomeres III–VIII, antennomeres III–VIII as long as wide, subrectangular or subquadrate, IX slightly wider than long, subhexagonal, X wider than XI (11: 8), widening to apex ( Fig. 1E ).

Pronotum as long as head, slightly wider than long, narrowest at anterior margin, gradually widening from anterior margin to middle, widest in middle, slightly narrowing from middle to posterior margin, with distinct median longitudinal sulcus and narrow transverse antebasal sulcus ( Figs 1A , 6B ).

Elytron with discal stria remote from second inner fovea reaching posterior margin ( Figs 1A, H , 6A ).

Abdominal tergite V with distinct discal striae ( Fig. 1J ).

Male genitalia. Parameres dissimilar in length, left paramere broadly curved to middle, apex sharply angled ventrally in lateral view; right paramere in ventral view slender and sinuate, apex sharp, directed laterally, with short apophysis at base visible in lateral view; median lobe abruptly expanded and recurved at apex, complex and curved dorsally ( Figs 6C–H ).

Distribution. New Zealand (North Island: AK, BP, CL, GB, HB, ND, RI, TK, TO, WN, WO, South Island: NN, SD, SI; Fig. 16B ).

Comments to classification. Euglyptus costifer Broun, 1893b , syn. nov., is here placed as the junior synonym of

E. elegans Broun, 1893a , based on examination of the types by D. S. Chandler. Additionally, as a result of comparing the original descriptions of both species, the separation of the two species was primarily based on sexual dimorphism due to the small eyes of the female for this genus.

Figures

Fig. 6. Euglyptus elegans Broun, 1893. A – habitus dorsal view; B – pronotum, C, D – aedeagus ventral view; E, F – aedeagus lateral view; G, H – aedeagus dorsal view. Scale bars: A = 1 mm; B–H = 0.1 mm.

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

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.