Adalmus mangamukaensis, Byeon & Chandler & Leschen & Park, 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 : 23-24

Adalmus mangamukaensis

Byeon & Chandler, sp. nov.

( Figs 5 , 10 )

Type material. HOLOTYPE: J (genitalia dissected, NZAC): “NEW ZEALAND: ND, Mangamuka Gorge, Mangamuka, Gorge Walkway, 35°11′42″S, 173°27′09″E, 455 m, sifted leaf litter & rotten woods, 15.Nov.2018, J. Shen ” . PARATYPES: NORTH ISLAND: AK [Auckland]: Waitakere Ranges Reg. Pk., Upper Huia Reser. Track, I- 31-2010, 340m 4km SW Waiatarua D.S.Chandler, sift mixed leaf litter (1 J, genitalia dissected, 2 ♀♀ DSC). ND [Northland]: Waipoua SF, 199m Kauri Ricker TK 13 Apr 1980 J.C. Watt // Sifted litter 80/49 (1 J, genitalia dissected, NZAC); Waipoua SF, 290m Waikohatu Bridge 14 Apr 1980 J.C. Watt // Sifted litter 80/53 (1 ♀ NZAC); Waipoua SF Wairau smt, 390m 14 Apr 1980 // Sifted litter 80/51 (1 ♀ NZAC); Waipoua State Forest, Waikohatu Stream bridge 300m, 28.xi-6.xii.1984 kauri-hdwd.- -podocarp A.Newton/M.Thayer 690 // flight intercept (window) trap (1 J genitalia dissected, NZAC; 1 J, slide mounted, DSC; 2 JJ, genitalia dissected, 2 JJ FMNH); Waipoua State Forest, Wairau Summit, 400m 27.xi-6.xii.1984 hdwd.-podocarp forest A.Newton/M.Thayer 687 // berl, leaf & log litter, forest floor (3 JJ 1 ♀ FMNH); Trounson Kauri Park, 250m, 3-7.xii.1984 kauri-podocarp-hdwd. A.Newton/M.Thayer 698 // berl, leaf & log litter, forest floor (3 JJ 1 ♀ FMNH); Waipoua SF, ToronuiTr.c 150m 13.iv.1980 kauri-podocarp-broadlf.-nikau palm forest A.Newton,M.Thayer // berl, leaf & log litter, forest floor (2 JJ 2 ♀♀ 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 (1 J 1 ♀ FMNH); Waipoua SF, Waiko-hatu Br. 290m 11-14.iv.80 Agathis -podocarp-broadlf.A.Newton,M.Thayer // berl, leaf & log litter, forest floor (1 ♀ FMNH). Waipoua SF, Toatoa Tr. 270m 12-15.iv.80 toatoa-kauri-podocarp-broadlf. A.Newton,M.Thayer // berl, leaf & log litter, forest floor (1 J FMNH).

Diagnosis. Adult males of this species can be distinguished from other Adalmus species by the following characters: body size smaller than 2.0 mm ( Fig. 5A ); protrochanter with blunt curved spine ( Fig. 5B ; arrow), mesotrochanter unmodified ( Fig. 5C ), metatrochanter with weak blunt spine curved mesad ( Fig. 5D ; arrow); left paramere shorter than right paramere; right paramere weakly sclerotized, curving and spatulate; median lobe broad and longer than parameres ( Figs 5E–G ).

Description. BL 1.60–1.85 mm (FBL 1.13–1.30 mm, 8 specimens measured); body, antenna, and legs reddish- -brown, maxillary palpus and tarsi yellowish-brown; body pubescent.

Head slightly broader than long (HL: HW = 34: 40), widest across eyes, eyes convex, rostrum broad (HW: RW = 40: 22), impression between ridge of antennal tubercles shallow, ridge of antennal tubercles parallel; apex of rostrum weakly projecting, clypeus barely visible in dorsal view; antennal length approximately 0.75–0.78 mm, antennomere I approximately 2.2 times longer than II, antennomere II longer and broader than III–VIII, antennomeres III–VIII similar in lengths, antennomeres IX–XI forming indistinct club, XI approximately 1.7 times as long as broad.

Thorax. Prothorax slightly wider than head (HW: PW = 40: 45), subhexagonal (PL: PW = 42: 45), broadest at anterior 2/5, sharply narrowing at middle, narrowest at anterior margin.

Elytra broader than pronotum (EW: PW = 60: 45), slightly broader than long (EL: EW = 54: 60); with sutural striae; weak impression at basal elytral foveae; subhumeral foveae present, not visible in dorsal view.

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

Aedeagus asymmetric, 0.23 mm long, with diaphragm and basal stem; parameres asymmetric, left paramere shorter than right paramere, right paramere weakly sclerotized, curving and spatulate; median lobe broad and longer than parameres.

Sexual dimorphism. Females have the posterior margin of the pro- and metatrochanters smoothly curved.

Etymology. The specific epithet is an adjective derived from the type locality ʻMangamukaʼ.

Distribution. New Zealand (North Island: AK, ND; Fig. 10 ).

Figures

Fig. 5. Adalmus mangamukaensis 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.