Nesamblyops disjunctus, Sokolov, 2023

Sokolov, Igor M., 2023, Fourteen new species of the genus Nesamblyops Jeannel (Coleoptera: Carabidae: Anillini) from the South Island of New Zealand with redescription of the genus and description of a new subtribe, Zootaxa 5375 (2), pp. 151-192 : 167-168

Nesamblyops disjunctus , sp. nov.

Figures. 9B , 12B , 14D–F , 17B , 22

Type material. HOLOTYPE, male, in NZAC, labeled: \ NEW ZEALAND BR Fletchers Creek 6km SW of Rotokohu Biological Res. \ 9 Nov 1971 J.S. Dugdale Litter 71/129 \ Beech Forest Utilization Project \ NZ PB \. PARATYPES (11 specimens, dissected 4 exx.), 2 males and 3 females labeled same as holotype; 3 females labeled: \ NEW ZEALAND BR 6km SW of Rotokohu 25 Jan 1972 J.S. Dugdale \ XPB4 Litter 72/99 \ NZ PB \; 1 female labeled: \ Inangahua Buller district litter 25.11.61 J.I. Townsend \ DSIR \ No \ NZ PB \; 1 male and 1 female labeled: \ Inangahua 25.11.61 litter J.I. Townsend \ DSIR \ No \ NZ PB \.

Additional material: 1 male and 1 female labeled: \ Reef Pt Antipodes I. 28 Feb 69 G. Kuschel \ 69/70 Litter \ moss \ NZ PB \.

Etymology. The specific epithet is a Latin adjective, disjunctus (meaning “separated, disjoined”), in the masculine form, and refers to the geographical distribution of this species, which is characterized by an amazing disjunction.

Type locality. New Zealand, South Island, West Coast, E slope of the Paparoa Range, Fletcher Creek area .

Recognition. Adults of this species ( Fig. 9B ) are practically indistinguishable from the adults of many Nesamblyops species based on external characters (e.g., Figs 9C , 10C , 11C ) and are distinguished from them by the structures of the male genitalia.

Description. Large for genus (SBL range 1.81–1.95 mm, mean 1.88± 0.042 mm, n=12).

Habitus. Body form ( Fig.9B )markedly convex, elongate ovoid, general proportions wide (WE/SBL0.41±0.006), head narrow relative to pronotum (WH/WPm 0.67±0.016), proportions of pronotum in comparison to elytra average for genus (WPm/WE 0.75±0.020).

Color. Body color brunneorufous, appendages testaceous.

Prothorax. Pronotum ( Fig. 12B ) moderately long in comparison to elytra (LP/LE 0.43±0.013) and moderately transverse (WPm/LP 1.24±0.029), with lateral margins arcuately constricted posteriorly (WPm/WPp 1.27±0.048). Anterior angles indistinct, posterior angles obtuse (105–114°), rounded. Width between posterior angles greater than between anterior angles (WPa/WPp 0.85±0.040). Basal margin almost rectilinear, slightly convex at middle.

Elytra. Ovoid, narrowly depressed along suture, comparatively long (LE/SBL 0.58±0.008) and moderately wide (WE/LE 0.70±0.014). 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. 14F ) slightly arcuate and moderately twisted. Shaft subparallel part of the length, tapering in apical third. Apex moderately curved dorsally with a small rounded tip. Apical orifice of moderate length, occupies less than half of the shaft length. Ventral margin of median lobe mostly straight, in apical third slightly dilated, next obliquely going up to apex. Walls of shaft with group poriferous canals near basal orifice. Dorsal copulatory sclerite composed of rC-sclerite with almost straight marginal sclerotization, moderately long V-contour, and curved lanceolate plate situated apico-ventrally from rC-sclerite ( Fig. 14F ). Left paramere ( Fig. 14D ) comparatively wide, with shortly attenuate apex, bearing three long setae. Right paramere ( Fig. 14E ) short, bearing three long setae, which are approximately equal the length of paramere. Ring sclerite as in Fig. 17B .

Female internal genitalia. Not examined.

Geographical distribution. The range of the species occupies two distant areas. First area includes the eastern slopes of the Paparoa Range between Inangahua and Rotokohu of the West Coast region, South Island. Second area is confined to Antipodes Island, lying 600 miles to the southeast of New Zealand ( Fig. 22 , red circles).

Habitat. Specimens from mainland were collected in litter without more detailed data, specimens from Antipodes Island were taken in a moss sample.

Relationships. The structure of the male genitalia of N. disjunctus suggests its close relatedness to N. victoriae , described below. Both species form a small and distinctive group.

Figures

FIGURE 9. Digital images of habitus of New Zealand Nesamblyops species, dorsal aspect.A—N. canaanensis (Canaan, Nelson, SO), B—N. disjunctus (Fletchers Creek, Buller, SO), C—N. hobbit (9mi. N Karamea, Nelson, SO), D—N. karamea (Karamea River Gorge, Nelson, SO), E—N. kuscheli (Flora Hut, MountArthur, Nelson, SO), F—N. magnificus (Allison Reserve,Akatore, Dunedin, SO). Scale bar = 1.0 mm.

FIGURE 10. Digital images of habitus of New Zealand Nesamblyops species, dorsal aspect. A—N. montanus (Lake Sylvester, Kahurangi National Park, Nelson, SO), B—N. moorei (Kangaroo Creek, Mawhera Forest, Buller, SO), C—N. ovipennis (Mount Arthur, Nelson, SO), D—N. rotundicollis (Onekaka, Nelson, SO), E—N. solitarius (Italian Creek, Capleston, Buller, SO), F—N. subcaecus (Sharp) (Greymouth, Buller, SO). Scale bar = 1.0 mm.

FIGURE 11. Digital images of habitus of New Zealand Nesamblyops species, dorsal aspect. A—N. subrufus (Dublin Terrace, Upper Buller Gorge, Nelson, SO), B—N. viator (Secretary Island, Grono Bay, Fiordland, SO), C—N. victoriae (Capleston, Victoria Range, Buller, SO). Scale bar = 1.0 mm.

FIGURE 12. Digital images of pronota of New Zealand Nesamblyops species, dorsal aspect. A—N. canaanensis (Canaan, Nelson, SO), B—N. disjunctus (Fletchers Creek, Buller, SO), C—N. hobbit (9mi. N Karamea, Nelson, SO), D—N. karamea (Karamea River Gorge, Nelson, SO), E—N. kuscheli (Flora Hut, Mount Arthur, Nelson, SO), F—N. magnificus (Allison Reserve, Akatore, Dunedin, SO), G—N. montanus (Lake Sylvester, Kahurangi National Park, Nelson, SO), H—N. moorei (Kangaroo Creek, Mawhera Forest, Buller, SO), I—N. ovipennis (Mount Arthur, Nelson, SO). Scale bar = 0.2 mm.

FIGURE 14. Line drawings of male genitalia of New Zealand Nesamblyops species. N. canaanensis (Canaan, Nelson, SO): A—left paramere, left lateral aspect, B—right paramere, right lateral aspect, C—median lobe, right lateral aspect. N. disjunctus (Fletchers Creek, Buller, SO): D—left paramere, left lateral aspect, E—right paramere, right lateral aspect, F—median lobe, right lateral aspect. N. hobbit (Mount Domett, Nelson, SO): G—left paramere, left lateral aspect, H—right paramere, right lateral aspect, I—median lobe, right lateral aspect. N. karamea (Karamea River Gorge, Nelson, SO): J—left paramere, left lateral aspect, K—right paramere, right lateral aspect, L—median lobe, right lateral aspect. N. kuscheli (Flora Hut, Mount Arthur, Nelson, SO): M—left paramere, left lateral aspect, N—right paramere, right lateral aspect, O—median lobe, right lateral aspect. N. magnificus (Allison Reserve, Akatore, Dunedin, SO): P—left paramere, left lateral aspect, Q—right paramere, right lateral aspect, R—median lobe, right lateral aspect. Legend: rCs—reversed C-contour; Vs—V-contour. Scale bar = 0.1 mm.

FIGURE 17. Line drawings of ring sclerite of New Zealand Nesamblyops species, male genitalia, dorsal aspect. A—N. canaanensis (Canaan, Nelson, SO), B—N. disjunctus (Fletchers Creek, Buller, SO), C—N. hobbit (Mount Domett, Nelson, SO), D—N. karamea (Karamea River Gorge, Nelson, SO), E—N. kuscheli (Flora Hut, Mount Arthur, Nelson, SO), F—N. montanus (Relax Shelter, Mount Robert Ridge, Nelson, SO), G—N. moorei (Kangaroo Creek, Mawhera Forest, Buller, SO), H—N. ovipennis (Mount Arthur, Nelson, SO), I—N. rotundicollis (Onekaka, Nelson, SO), J—N. subcaecus (Margarets Tarn Lake, Arthur’s Pass, Mid Canterbury, SO), K—N. viator (Secretary Island, Grono Bay, Fjordland, SO), L—N. victoriae (Capleston, Victoria Range, Buller, SO). Scale = 0.2 mm.

FIGURE 22. Distributional records for the Nesamblyops species and images of male median lobe, obtained from specimens, collected in the line-connected with images localities. Yellow circles—N. victoriae; black circles—N. moorei; red circles—N. disjunctus. Scale bar = 0.5 mm.