Adalmus puberilumbus 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 : 24-25

Adalmus puberilumbus Byeon & Chandler , sp. nov.

( Figs 6 , 10 )

Type material. HOLOTYPE: J (genitalia dissected, NZAC): “NEW ZEALAND: BR Nelson Lakes N.P., Mt. Robert Road , 660m 26.xii.84–6.i.85; Lepto-spermum-Nothof.scrub A.Newton / M.Thayer 722 // flight intercept (window) trap” . PARATYPES: SOUTH ISLAND: 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, 3 ♀♀ DSC; 4 JJ 2 ♀♀ FMNH); 0.6km e Gowan-

bridge, 330m, 18.xii.84–7.i.85 Nothofagus spp. forestA.Newton/M.Thayer 717 // flight intercept (window) trap (1 ♀ FMNH). BR [Buller]: 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 (1 ♀ NZAC; 1 ♀ DSC; 1 J FMNH); 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 (1 J FMNH); Lakes N.P.,Mt. Robert Road, 660m 26.xii.84–6.i.85; Lepto-spermum-Nothof. scrubA.Newton/M. Thayer 722 // flight intercept (window) trap (1♀ FMNH); Maruia Springs 20 Nov 2010 // Washed soil sample. red beach forest [ JTN] (1 ♀ JTN). 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); Tennyson Inlet, west side Te Mako Bay, 125m 15.xii.1984 – 5.i.1985 Nothofagus -podo-hdwd. A.Newton/M. Thayer 710 // flight intercept (window) trap (1 J FMNH); same locality label, but: berl, leaf & log litter, forest floor (1 ♀ FMNH).

Diagnosis. Males of this species can be distinguished from other Adalmus species by the following characters: apex of rostrum strongly projecting, clypeus not visible in dorsal view, antennomere I approximately 2.3 times as long as II ( Fig. 6A ); protrochanter unmodified ( Fig. 6B ), mesotrochanter with weak spine ( Fig. 6C ; arrow), metatrochanter with distinct spine ( Fig. 6D ; arrow); parameres fused and with blunt apex; median lobe with spine at middle, apex curved and setose ( Figs 6E–G ).

Description. BL 2.02–2.05 mm (FBL 1.52–1.55 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 = 35: 40), widest across eyes, rostrum broad (HW: RW = 35: 24), impression between ridges of antennal tubercles deep, ridges of antennal tubercles parallel; apex of rostrum strongly projecting, clypeus not visible in dorsal view; antennal length approximately 0.91–0.93 mm, antennomere I slightly broader than II, approximately 2.3 times as long as II, antennomere II longer and wider than III–VIII, antennomere V longest among III–VIII, antennomeres IX–XI forming indistinct club.

Thorax. Prothorax wider than head (HW: PW = 40: 49), subhexagonal (PL: PW = 48: 49), broadest at anterior 2/5, sharply narrowing at middle, narrowest at anterior margin.

Elytra broader than pronotum (EW: PW = 64: 49); slightly broader than long (EL: EW = 57: 64), with sutural striae, weak impression at elytral foveae, subhumeral foveae present, not visible in dorsal view.

Legs. Protrochanter with smooth posterior margin; profemur rugose on ventral side; mesotrochanter with weak spine, metatrochanter with distinct spine; tibiae and femora of similar lengths, moderately long.

Aedeagus asymmetric, 0.33 mm long, with diaphragm and basal stem, basal stem curved, parameres fused and with blunt apex; median lobe with spine at middle, apex curved and setose.

Sexual dimorphism. Females have a simple metatrochanter with the posterior margin smoothly curved.

Etymology. The specific epithet is a noun in the nominative case, a combination of Latin words puberi (ʻdownyʼ, masculine) and lumbus (ʻgenitaliaʼ, masculine) and refers to the setose apex of median lobe.

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

Figures

Fig. 6. Adalmus puberilumbus 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.