Nesamblyops carltoni, Sokolov, 2023

Sokolov, Igor M., 2023, Eight new species of the genus Nesamblyops Jeannel (Anillini: Carabidae: Coleoptera) from New Zealand with notes about dispersal of the genus to the North Island, Zootaxa 5230 (2), pp. 179-201 : 183-184

Nesamblyops carltoni , sp. nov.

Figs. 2B , 4B , 5D–F , 7B , 10

Type material. HOLOTYPE, male, in NZAC, labeled: \ Wooded Pk. East Summit Dun Mountain Nelson \ 14 Sept 71 G.W. Ramsay \ Litter 71/116 \ DSIR \ No \ NZ PB \. PARATYPES (146 specimens, in NZAC, dissected 9 exx.) , 81 males and females labeled same as holotype; 1 male and 3 females labeled: \ Wooded Pk. Dun Track Sdle Nelson 14 Sept. 71 \ G.Ramsay \ litter 71/109 \ DSIR \ No \ NZ PB \; 1 female labeled: \ Dun Mt. 2000’ 28.11.43 E.S. Gourlay \ E.S. Gourlay Acc. 1970 Ent. Div. \ NZ PB \; 2 males and 2 females labeled: \ Dun Mt. 2500’ 13.11.61 Nelson G.Kuschel \ 61/1 \ DSIR \ No \ NZ PB \; 1 female labeled: \ Leafmould \ Dun Mt. 2500’ 13.11.61 G.Kuschel \ NZ PB \; 1 male and 2 females labeled: \ Dun Track Nelson 14 Sept 71 \ G.Ramsay \ Litter 71/112 \ NZ PB \; 1 male labeled: \ Just beyond 3 rd. House Dun Mt. Nelson J.I. Townsend \ DSIR \ No \ NZ PB \; 1 female labeled: \ Pelorus Bridge 100’ 15.10. 65 L. P. Marchaut \ moss in bush 65/512 \ NZ PB \; 1 female labeled: \ Pelorus Val. 29-4-64 litter J.I. Townsend \ DSIR \ No \ NZ PB \; 4 males and 2 females labeled: \ Upper Maitai , 7-3-49 E.S. Gourlay \ E.S. Gourlay Acc. 1970 Ent. Div. \ NZ PB \; 1 female labeled: \ Upper Maitai ,(c.) 19-5-41 E.S. Gourlay \ E.S. Gourlay Acc. 1970 Ent. Div. \ Nesamblyops oreobius Broun E.B.Britton det. 1960 \ NZ PB \; 1female labeled: \ Upper Maitai , 13-2-57 E.S. Gourlay \ NZ PB \; 16 males and females labeled: \ Upper Maitai 3.5.50 E.S. Gourlay \ Carabidae \; 3 males and 3 females labeled: \ Maungatapu Sdle. 2400’ \ Nel. 15.11.67 J.I.Townsend \ moss sample 67/83 \ DSIR \ No \ NZ PB \; 1 female labeled: \ Maungatapu 3000’ 17.4.38 E.S. Gourlay \ E.S. Gourlay Acc. 1970 Ent. Div .\; 4 males and 2 females labeled: \ NEW ZEALAND NN Whangamoa Sdle 700m Slaters Rd 4 May 1997 J S Dugsdale N menziesii N truncata kamahi litter \ NZ PB \; 5 males and 2 females labeled: \ Nelson, N.Z. Whangamoa Saddle 14.9.74 J.I. Townsend leafmould \ Coll. J.I. Townsend \; 2 females labeled: \ Titirangi Marlborough 2 Oct 69 F. Alack \ Litter 69/174 \ NZ PB \; 1 male and 2 females labeled: \ Titirangi Marlb. 22.x. 69 F. A. Alack \ Litter 69/174 \ DSIR \ No \ NZ PB \.

Additional material: \ Wairoa Gorge Nelson 5-4-60 J.I. Townsend \ NZ PB\ (4 females) .

Etymology. The specific epithet is a Latinized eponym in the genitive case and is based on the surname of Christopher E. Carlton, Professor and former Director of Louisiana State Arthropod Museum, Baton Rouge, Louisiana, United States, who triggered my interests in research of the members of the tribe Anillini in the USA as well as in New Zealand.

Type locality. New Zealand, South Island, Nelson, Richmond Range, Dun Mountain .

Recognition. Adults of this species ( Fig. 2B ) are virtually similar to the adults of many Nesamblyops species (cf. with Figs. 2A , 3B ), however can be easily distinguished from them by the shape of posterior angle of pronotum, formed by tiny blunt denticle, and the structure of the male genitalia.

Description. Large for genus (SBL range 1.75–2.03 mm, mean 1.89± 0.078 mm, n=29).

Habitus. Body form ( Fig.2B ) markedly convex, elongate ovoid, general proportions wide (WE/SBL 0.40±0.010), head narrow relative to pronotum (WH/WPm 0.67±0.016), proportions of pronotum in comparison to elytra average for genus (WPm/WE 0.76±0.019).

Color. Body color brunneopiceous, appendages testaceous.

Prothorax. Pronotum ( Fig. 4B ) moderately long in comparison to elytra (LP/LE 0.43±0.011) and moderately transverse (WPm/LP 1.23±0.026), with lateral margins arcuately constricted posteriorly (WPm/WPp 1.26±0.022). Anterior angles indistinct, posterior angles obtuse (106–115°), in form of protruding blunt denticles with faint sinuation anteriorly. Width between posterior angles greater than between anterior angles (WPa/WPp 0.85±0.032). Basal margin almost rectilinear, slightly convex at middle.

Elytra. Ovoid, narrowly depressed along suture, comparatively long (LE/SBL 0.58±0.007) and moderately wide (WE/LE 0.69±0.020). Humeri completely rounded. Lateral margins slightly divergent at basal half, subparallel at middle and evenly rounded to apex in apical third.

Male genitalia. Median lobe of aedeagus ( Fig. 5F ) moderately arcuate and moderately twisted. Shaft subparallel, tapering in apical third. Apex slightly curved dorsally with narrowly rounded tip. Apical orifice of moderate length, reaches one third of the shaft length. Ventral margin of median lobe straight. Walls of shaft with numerous poriferous canals. Dorsal copulatory sclerites in form of characteristic “bird’s head” plate, with apically attenuated dorsal part. Scaled membraneous fields lacking. Spines of internal sac absent. Left paramere ( Fig. 5D ) comparatively narrow, with shortly attenuate apex, bearing three long setae. Right paramere ( Fig. 5E ) elongated, bearing three long setae, which are slightly shorter the length of paramere. Ring sclerite as in Fig. 7B .

Female internal genitalia. Not examined.

Geographical distribution. The range of this species stretches along the eastern coast of Tasman Bay from the Wairoa George in the south to Titirangi Bay of the Marlborough Sound region ( Crosby et al. 1998) to the north ( Fig. 10 , black circles).

Habitat. Specimens were collected from leaf litter, leaf mold, moss in bush and Nothofagus forests (labels mention kamahi shrub Weinmannia racemosa , silver N. menziesii , and hard N. truncata beeches).

Relationships. Based on the structure of the male genitalia N. carltoni occupies an isolated position among examined species of the genus.

Figures

FIGURE 2. Digital images of habitus of New Zealand Nesamblyops species, dorsal aspect. A—N. brouni (Lewis Pass, North Canterbury, SO), B—N. carltoni (Dun Mountain, Nelson, SO), C—N. confusus (Mount Stokes, Marlborough Sounds, SO), D—N. distinctus (Fabians Valley, Marlborough, SO), E—N. lescheni (D’Urville Island, Cook Strait, Marlborough Sounds, SO), F—N. oreobius (Mount Pirongia, Waikato, NO). Scale bar 1.0mm.

FIGURE 3. Digital images of habitus of New Zealand Nesamblyops species, dorsal aspect. A—N. parvulus (Mount Stokes, Marlborough Sounds, SO), B—N. tararua (Judd Ridge, Tararua Range, Wellington, NO), C—N. townsendi (Tennyson Inlet, Marlborough Sounds, SO). Scale bar 1.0mm.

FIGURE 4. Digital images of pronota of New Zealand Nesamblyops species, dorsal aspect. A—N. brouni (Lewis Pass, North Canterbury, SO), B—N. carltoni (Dun Mountain, Nelson, SO), C—N. confusus (Mount Stokes, Marlborough Sounds, SO), D—N. distinctus (Fabians Valley, Marlborough, SO), E—N. lescheni (D’Urville Island, Cook Strait, Marlborough Sounds, SO), F—N. oreobius (Mount Pirongia, Waikato, NO), G—N. parvulus (Mount Stokes, Marlborough Sounds, SO), H—N. tararua (Judd Ridge, Tararua Range, Wellington, NO), I—N. townsendi (Tennyson Inlet, Marlborough Sounds, SO). Scale bar 0.2mm.

FIGURE 5. Line drawings of male genitalia of New Zealand Nesamblyops species. N. brouni (Lewis Pass, North Canterbury, SO): A—left paramere, left lateral aspect, B—right paramere, right lateral aspect, C—median lobe, right lateral aspect. N. carltoni (Dun Mountain, Nelson, SO): D—left paramere, left lateral aspect, E—right paramere, right lateral aspect, F—median lobe, right lateral aspect. N. confusus (Mount Stokes, Marlborough Sounds, SO): G—left paramere, left lateral aspect, H—right paramere, right lateral aspect, I—median lobe, right lateral aspect. N. distinctus (Fabians Valley, Marlborough, SO): J—left paramere, left lateral aspect, K—right paramere, right lateral aspect, L—median lobe, right lateral aspect. N. lescheni (D’Urville Island, Cook Strait, Marlborough Sounds, SO): M—left paramere, left lateral aspect, N—right paramere, right lateral aspect, O—median lobe, right lateral aspect. N. oreobius (Mount Pirongia, Waikato, NO): P—left paramere, left lateral aspect, Q—right paramere, right lateral aspect, R—median lobe, right lateral aspect. Scale bar 0.1mm.

FIGURE 7. Line drawings of ring sclerite of New Zealand Nesamblyops species, male genitalia, dorsal aspect. A—N. brouni (Lewis Pass, North Canterbury, SO), B—N. carltoni (Dun Mountain, Nelson, SO), C—N. distinctus (Fabians Valley, Marlborough, SO), D—N. oreobius (Mount Pirongia, Waikato, NO), E—N. lescheni (D’Urville Island, Cook Strait, Marlborough Sounds, SO), F—N. parvulus (Mount Stokes, Marlborough Sounds, SO), G—N. tararua (Judd Ridge, Tararua Range, Wellington, NO), H—N. townsendi (Tennyson Inlet, Marlborough Sounds, SO). Scale = 0.4mm.

FIGURE 10. Distributional records for the Nesamblyops species and images of male median lobe, obtained from specimens, collected in the line-connected with images localities. Black circles—N. carltoni; yellow circles—N. parvulus; red circles—N. lescheni; green circles—N. confusus. Scale bar= 0.5mm.