Zeanillus pellucidus, Sokolov, Igor M., 2016

Sokolov, Igor M., 2016, A taxonomic review of the anilline genus Zeanillus Jeannel (Coleoptera: Carabidae: Bembidiini) of New Zealand, with descriptions of seven new species, re-classification of the species, and notes on their biogeography and evolution, Zootaxa 4196 (1), pp. 1-37 : 17-19

Zeanillus pellucidus , sp.n.

Figs. 1 D, 2C, 3E–F, 4D, 5D, 6D, 7E, 8C, 9C, 10CHN, 11E, 12Q–T, 14E, 15E, 16D, 18A

Type material. HOLOTYPE, male, in NZAC, board-mounted, undissected, labeled: / New Zealand DN Roy Cooper Res Oamaru 2 Aug 0 7 / Washed soil sample broadleaf forest /.

PARATYPES (21 specimens, 5 dissected), 8 males and 11 females labeled same as holotype; 1 female labeled: / New Zealand DN Glen Warren Res Oamaru 19 Jan 0 7 / Washed soil sample / ; 1 male labeled: / New Zealand: DN, Glen Warren Reserve , Oamaru, 150m, washed soil sample, dry coastal broadleaf forest, H45/864483 J.Nunn 12 Jan 2008 /.

Specific epithet. The specific epithet is a Latinized adjective in the masculine form and is derived from the Latin adjective pellūcidus meaning "transparent". The epithet refers to the translucent elytra of the new species.

Type locality. New Zealand, South Island, Otago, Oamaru , Glen Warren Reserve.

Recognition. Adults of this species ( Fig. 11 E) are distinguished from other congeners by the characters listed in the subgeneric diagnosis.

Description. Size. Small for genus (SBL range 1.41–1.64 mm, mean 1.54± 0.058 mm, n=20).

Habitus. Body form subdepressed, ovoid, moderately elongate (WE/SBL 0.35±0.007), head of moderate width for genus compared to pronotum (WH/WPm 0.75±0.019), pronotum of moderate width in comparison to elytra (WPm/WE 0.74±0.022).

Color. Body color testaceous, appendages testaceous.

Prothorax. Pronotum slightly long (LP/LE 0.41±0.017) and slightly transverse (WPm/LP 1.34±0.039), with slightly sinuated and markedly constricted posteriorly lateral margins (WPm/WPp 1.84±0.090). Width between anterior angles much greater than between posterior angles (WPa/WPp 1.44±0.057).

Elytra. Moderately depressed, comparatively short (LE/SBL 0.47±0.023) and moderately wide (WE/LE 0.75±0.031). Lateral margins slightly divergent at basal half, subparallel at middle and evenly rounded to apex in apical third.

Male genitalia. Median lobe ( Fig. 12 Q) with slightly concave ventral margin and semicircular short apex. Apical orifice area with a pair of short ostial fields. Sclerites of internal sac very short, united basally, with unequally sclerotized branches. Left paramere without apical constriction ( Fig. 12 S). Ring sclerite with short and moderately transverse handle ( Fig. 14 E).

Female internal genitalia. Goncoxite 2 with long ensiform setae ( Fig. 15 E). Spermatheca sclerotized, slightly elongate, with two compartments ( Fig. 16 E). Spermathecal duct short with few coils. Attachments of spermathecal duct and gland to spermatheca close together.

Geographical distribution. This species inhabits coastal plain of North Otago, where it is known from one locality only (18A, blue diamond).

Way of life. Specimens were collected from soil in a dry broadleaf coastal forest.

Relationships. Zeanillus pellucidus is a morphologically isolated species within the genus. The presence of postorbital seta, shared with the members of Zeanillus s.str., putatively, suggests the latter as the closest relatives. However, striking differences between two taxa in the structure of male genitalia and spermatheca suggests that they are not very close. It is likely that Z. pellucidus is a highly derived taxon of ancient origin and its relationship to the representatives of other subgenera is equidistantly remote.

Figures

FIGURE 1. SEM illustrations of head, dorsal aspect, of Zeanillus species. A— Z. phyllobius; B— Z. punctigerus; C— Z. pallidus; D— Z. pellucidus; E— Z. lescheni; F— Z. nanus. Legend: cl—clypeus; cs—clypeal seta; fcc—fronto-clypeal carina; fs—frontal seta; lb—labrum; mp 3 — maxillary palpomere 3; mp 4 — maxillary palpomere 4; pos—postorbital seta; ssa—anterior supraorbital seta; ssp—posterior supraorbital seta. Scale bars = 0.1 mm.

FIGURE 11. Digital images of habitus of Zeanillus species, dorsal aspect. A— Z. phyllobius (NZ, Canterbury, Coopers Knob); B— Z. punctigerus (NZ, Canterbury, Sharplin Falls); C— Z. nunni (NZ, Otago, Highway 87 at Rocklands Road); D— Z. pallidus (NZ, Otago, Taieri Mouth); E— Z. pellucidus (NZ, Otago, Oamaru, Glen Warren Reserve); F— Z. brouni (NZ, Otago, Oamaru, Glen Warren Reserve); G— Z. carltoni (NZ, Otago, Mount Watkin); H— Z. lescheni (NZ, Otago, Waikaia Forest); I— Z. montivagus (NZ, Otago, North Rough Ridge): J— Z. nanus (NZ, Otago, Pisa Range). Scale bar = 1.0 mm.

FIGURE 12. Line drawings of aedeagus of Zeanillus species. Z. punctigerus (NZ, Canterbury, Sharplin Falls): A—median lobe, right lateral aspect, B—apical part of median lobe, dorsal aspect, C—left paramere, left lateral aspect, D—right paramere, right lateral aspect; Z. nunni (NZ, Otago, Evansdale): E—median lobe, right lateral aspect, F—apical part of median lobe, dorsal aspect, G—left paramere, left lateral aspect, H—right paramere, right lateral aspect; Z. phyllobius (NZ, Canterbury, Ahuriri Scenic Reserve): I—median lobe, right lateral aspect, J—apical part of median lobe, dorsal aspect, K—left paramere, left lateral aspect, L—right paramere, right lateral aspect; Z. pallidus (NZ, Otago, Taieri Mouth): M—median lobe, right lateral aspect, N—apical part of median lobe, dorsal aspect, O—left paramere, left lateral aspect, P—right paramere, right lateral aspect; Z. pellucidus (NZ, Otago, Oamaru, Glen Warren Reserve): Q—median lobe, right lateral aspect, R—apical part of median lobe, dorsal aspect, S—left paramere, left lateral aspect, T—right paramere, right lateral aspect. Legend: ao—apical orifice; bo—basal orifice; ds—dorsal sclerites, of—ostial field. Scale bar = 0.1 mm.

FIGURE 14. Line drawings of ring sclerite of Zeanillus species, male genitalia, dorsal aspect. A— Z. phyllobius (NZ, Canterbury, Ahuriri Scenic Reserve); B— Z. punctigerus (NZ, Canterbury, Orari Gorge); C— Z. nunni (NZ, Otago, Highway 87 at Rocklands Rd); D— Z. pallidus (NZ, Southland, Thomsons Bush); E— Z. pellucidus (NZ, Otago, Oamaru, Glen Warren Reserve); F— Z. nanus (NZ, Otago, Pisa Range); G— Z. montivagus (NZ, Otago, North Rough Ridge); H— Z. brouni (NZ, Otago, Oamaru, Glen Warren Reserve); I— Z. lescheni (NZ, Otago, Waikaia Forest); J— Z. carltoni (NZ, Otago, Mount Watkin). Legend: hd—handle of ring sclerite. Scale bar = 0.1 mm.

FIGURE 15. Line drawings of right ovipositor sclerite, lateral aspect, of Zeanillus species. A— Z. phyllobius (NZ, Canterbury, Ahuriri Scenic Reserve); B— Z. punctigerus (NZ, Canterbury, Sharplin Falls); C— Z. nunni (NZ, Otago, Woodside Glen); D— Z. pallidus (NZ, Otago, Taieri Mouth); E— Z. pellucidus (NZ, Otago, Oamaru, Glen Warren Reserve); F— Z. brouni (NZ, Otago, Oamaru, Glen Warren Reserve); G— Z. carltoni (NZ, Otago, Mount Watkin); H— Z. lescheni (NZ, Otago, Waikaia Forest); I— Z. montivagus (NZ, Otago, North Rough Ridge); J— Z. nanus (NZ, Otago, Balclutha). Legend: es—ensiform seta; gc 1 — gonocoxite 1; gc 2 — gonocoxite 2; lt—laterotergite; ns—nematiform seta. Scale bar = 0.05 mm.

FIGURE 16. Line drawings of spermatheca, spermathecal duct, and spermathecal gland of Zeanillus species. A— Z. phyllobius (NZ, Canterbury, Ahuriri Scenic Reserve); B— Z. punctigerus (NZ, Canterbury, Sharplin Falls); C— Z. nunni (NZ, Otago, Woodside Glen); D— Z. pellucidus (NZ, Otago, Oamaru, Glen Warren Reserve); E— Z. pallidus (NZ, Otago, Taieri Mouth); F— Z. brouni (NZ, Otago, Oamaru, Glen Warren Reserve); G— Z. montivagus (NZ, Otago, North Rough Ridge); H— Z. nanus (NZ, Otago, Balclutha). Legend: sd—spermathecal duct; sg—spermathecal gland; sp—spermatheca. Scale bar = 0.05 mm.