Nesamblyops karamea, 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 : 169-170

Nesamblyops karamea , sp. nov.

Figures. 9D , 12D , 14J–L , 17D , 19

Type material. HOLOTYPE, male, in NZAC, labeled: \ Karamea River Gorge. F.Alack 24.vi.67 \ litter 67/216 \ DSIR \ No \ NZ PB \. PARATYPES (9 specimens, dissected 2 exx.), 1 male and 2 females labeled same as holotype; 2 males labeled: \ Karamea Val. F.Alack 21.vi.67 \ litter 67/218 \ DSIR \ No \ NZ PB \; 1 male and 3 females labeled: \ 6m . up Little Wanganui R. West Nelson. \ F.Alack 24.vi.67 \ litter 67/211 \ DSIR \ No \ NZ PB \.

Etymology. The specific epithet is a noun in apposition in the nominative case and refers to the name of the river gorge from which the new species is described.

Type locality. New Zealand, South Island, West Coast, Kahurangi National Park, the Karamea River Gorge area .

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

Description. Of moderate size for genus (SBL range 1.67–1.91 mm, mean 1.79± 0.076 mm, n=9).

Habitus. Body form ( Fig. 9D ) markedly convex, elongate ovoid, general proportions wide (WE/SBL0.40±0.010), head narrow relative to pronotum (WH/WPm 0.68±0.015), proportions of pronotum in comparison to elytra average for genus (WPm/WE 0.75±0.013).

Color. Body color brunneorufous, appendages testaceous.

Prothorax. Pronotum ( Fig. 12D ) moderately long in comparison to elytra (LP/LE 0.42±0.010) and moderately transverse (WPm/LP 1.22±0.024), with lateral margins arcuately constricted posteriorly (WPm/WPp 1.31±0.049). Anterior angles indistinct, posterior angles obtuse (107–119°), rounded. Width between posterior angles greater than between anterior angles (WPa/WPp 0.89±0.027). Basal margin almost rectilinear, slightly convex at middle.

Elytra. Ovoid, narrowly depressed along suture, comparatively long (LE/SBL 0.59±0.007) and moderately wide (WE/LE 0.68±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. 14L ) moderately arcuate and moderately twisted. Shaft short, convex dorsally, tapering in apical half. Apex moderately curved dorsally with rounded tip. Apical orifice long, occupies almost half of the shaft length. Ventral margin of median lobe straight. Walls of shaft without poriferous canals. Dorsal copulatory sclerites with well-developed rC-sclerite and with moderately long V-contour ( Fig. 14L ). Additionally, internal sac possesses curved narrowly sclerotized fold apico-ventrally from rC-sclerite. Left paramere ( Fig. 14J ) comparatively narrow, with slightly tapering apex, bearing three long setae. Right paramere ( Fig. 14K ) of moderate length, bearing three long setae, which are slightly shorter than the length of paramere. Ring sclerite as in Fig. 17D .

Female internal genitalia. Not examined.

Geographical distribution. The range of the species occupies the northern part of the West Coast presumably between the Karamea and the Wanganui Rivers ( Fig. 19 , yellow circles).

Habitat. Specimens were collected from litter samples.

Relationships. The structure of the male genitalia of N. karamea suggests its relatedness to the other species with well-developed rC-sclerite and V-contour in the internal sac of the median lobe (cf. with the sclerites of N. carltoni , Fig. 5F, p . 190, Sokolov 2023). However, some details in the internal sac such as a presence of additional curved sclerotized fold apico-ventrally point out on isolated position of N. karamea within the genus. Taking in account the trisetose parameres and a shape of median lobe this species may have a remote relatedness to the group of species, which includes N. canaanensis , N. hobbit , and N. ovipennis .

Figures

FIGURE 5. Digital illustrations of structural features of pterothorax of Anillini, ventral aspect: A–D—subtribe Nesamblyopina; A—Nesamblyops oreobius (Broun); B—Nesamblyops subcaecus (Sharp); C—Nesamblyops brouni Sokolov; D—Nesamblyops viator n.sp.; E—Anillinus langdoni Sokolov and Carlton; F—Anillinus Cherokee Sokolov and Carlton; G—Geocharidius longinoi Sokolov and Kavanaugh; H—Geocharidius disjunctus Sokolov and Kavanaugh; I—Zapotecanillus longinoi Sokolov; J—Zeanillus pellucidus Sokolov; K—Zeanillus pallidus (Broun); L—Zeanillus nunni Sokolov; M—Pelodiaetodes insularis Sokolov; N—Pelodiaetodes nunni Sokolov; O—Pelodiaetodes moorei Sokolov; P—Pelodiaetus sulcatipennis Jeannel.Legend: mtes—metendosternite. Scales intentionally omitted.

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 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 19. Distributional records for the Nesamblyops species and images of male median lobe, obtained from specimens, collected in the line-connected with images localities. Green circles—N. canaanensis; black circles—N. hobbit; blue circles— N. ovipennis; yellow circles—N. karamea; red circles—N. kuscheli. Scale bar = 0.5 mm.