Adalmus bullerensis Byeon & Chandler, 2024

Byeon, Ui-Joung, Chandler, Donald S., Leschen, Richard A. B. & Park, Jong-Seok, 2024, Revision of the New Zealand genus Adalmus with description of six new species (Coleoptera: Staphylinidae: Pselaphinae), Acta Entomologica Musei Nationalis Pragae 64 (1), pp. 17-32 : 20-21

Adalmus bullerensis Byeon & Chandler , sp. nov.

( Figs 2 , 10 )

Type material. HOLOTYPE: J (genitalia dissected, NZAC): “NEW ZEALAND:BR, Lewis Pass Nat.Res., 0.6km s Lewis Pass, 870m 17.xii. 1984 – 21.i.1985 Nothofagus spp. forest A.Newton / M.Thayer 714 // flight intercept (window) trap” . PARATYPES: SOUTH ISLAND: BR [Buller]: same data as holotype (2 JJ, genitalia dissected, 5 JJ 1 ♀ FMNH); Nelson Lks.N.P., n slope Mt.Robert, Pinchgut Track 950m, 14.xii.84–6.i.85 Nothofagus spp. forest A.Newton/M.Thayer 707 // flight intercept (window) trap (1J FMNH); Nelson Lks.N.P., Lake Rotoiti, St.Arnaud Track, 670m 14.xii.1984 – 6.i.1985 Nothofagus spp. forest A.Newton/M.Thayer 706 // flight intercept (window) trap (2 JJ FMNH); Nelson Lakes NP, N slope Mt. Robert 860m 23–26.iii.80 Nothofagus spp. A .Newton,M.Thayer //

berl., leaf & log litter, forestfloor (1 J FMNH). Nelson Lakes NP, N slope Mt. Robert 860m 23–26.iii.80 Nothofagus spp.A .Newton,M.Thayer (1♀ FMNH). NN [Nelson]: Slaters Road, 0.7 km 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, 1J FMNH). WD [Westland]: 1.8km n Punakaiki, 80m 19.xii.1984 - 20.i.1985 hdwd. for. with nikau A.Newton/M.Thayer 718 // flight intercept (window) trap (1 J, genitalia dissected, FMNH).

Diagnosis. Males of this species can be distinguished from other Adalmus species by the following characters: antennomere I approximately twice as long as II ( Fig. 2A ); pro- and metatrochanters unmodified ( Figs 2B, D ), mesotrochanter with distinct spine ( Fig. 2C ; arrow); right paramere longer than left paramere, slightly curved at middle, left paramere dichotomous and short spine curved ventrally; median lobe with small foramen at apex, with dorsal curved spine ( Figs 2E–G ).

Description. BL 1.98–2.20 mm (FBL 1.49–1.68 mm, 10 specimens measured); body, antenna, and legs reddish- -brown, maxillary palpus and tarsi yellowish-brown; body pubescent.

Head slightly broader than long (HL: HW = 38: 43), widest at eyes, rostrum broad (HW: RW = 43: 24), impressions between ridges of antennal tubercles weak, ridges of antennal tubercles parallel; apex of rostrum strongly projecting, clypeus not visible in dorsal view; antennal length approximately 0.84–0.88 mm, antennomere I slightly broader than II, approximately twice as long as II, antennomere II longer and wider than III–VIII, antennomeres III–VIII similar in length, antennomeres IX–XI forming indistinct club.

Thorax. Prothorax wider than head (HW: PW = 43: 49), subhexagonal (PL: PW = 49: 49), broadest at anterior 2/5, gently narrowing at middle, narrowest at anterior margin.

Elytra broader than pronotum (EW: PW = 75: 49), slightly broader than long (EL: EW = 67: 75); with sutural striae; weak impression at elytral foveae; subhumeral foveae present, not visible in dorsal view.

Legs. Pro- and metatrochanters with smooth posterior margin; profemur rugose on ventral side; mesotrochanter with distinct spine; tibiae and femora of similar length, moderately long.

Aedeagus asymmetric, 0.49 mm long, with diaphragm and basal stem; parameres asymmetric, right paramere longer than left paremere, right paramere slightly curved at middle, left paramere dichotomous and short spine curved ventrally; median lobe with small foramen at apex, with dorsal curved spine.

Sexual dimorphism. Females have comparatively larger bodies, and the mesotrochanter is simple, with a smooth posterior margin.

Etymology. The specific epithet is an adjective derived from the Crosby code of the type locality ʻBullerʼ.

Distribution. New Zealand (South Island: BR, NN, WD; Fig. 10 ).

Figures

Fig. 2. Adalmus bullerensis sp. nov. A – male dorsal habitus; B – front leg; C – middle leg; D – hind leg; E–G – aedeagus in ventral (E), lateral (F) and dorsal (G) view.

Fig. 10. Collection localities in New Zealand.