Pelodiaetodes nunni, Sokolov, Igor M., 2015

Sokolov, Igor M., 2015, Review of the species of Pelodiaetodes Moore (Coleoptera: Carabidae: Bembidiini: Anillina) of New Zealand, Zootaxa 3963 (4), pp. 561-582 : 577-578

Pelodiaetodes nunni , sp. n.

Figs. 1 BD, 2BD, 3ACHL, 5F, 6F, 7P–S, 8E, 9CF, 10D, 11

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

PARATYPES (29 examples, 5 exx. dissected), 5 males and 23 females labeled same as holotype; 1 female labeled: \ New Zealand DN Glen Warren Res Oamaru 19 Jan 0 7 \ Washed soil sample\.

Specific epithet. The specific epithet is a Latinized eponym in the genitive case, and is based on the surname of John T. Nunn, the collector of this species.

Type locality. New Zealand, South Island, Dunedin, Oamaru, Glen Warren Reserve (=Roy Cooper Reserve, another name used for the same area).

Recognition. Adults of this species ( Fig. 5 F) are distinguished from the adults of other congeners in having only one discal pore (ed6), by the shape of pronotum, by structure of the median lobe, by the structural details of ovipositor and by almost spherical spermatheca.

Description. Size. Large-sized for genus (SBL range 1.61–1.84 mm, mean 1.73± 0.075 mm, n=20).

Habitus. Body form subdepressed, subparallel, moderately elongate (WE/SBL 0.34±0.010), head moderately narrow for genus compared to pronotum (WH/WPm 0.77±0.015), pronotum wide in comparison to elytra (WPm/ WE 0.83±0.015).

Color. Body color brunneorufous, appendages testaceous.

Prothorax. Pronotum ( Fig. 1 D, 6F) moderately long (LP/LE 0.43±0.021) and moderately elongate (WPm/LP 1.23±0.040), with lateral margins shallowly sinuate and moderately constricted posteriorly (WPm/WPp 1.37±0.023). Anterior angles prominent, posterior angles slightly obtuse (110–120°). Posterior margin wide, width between anterior angles moderately greater than between posterior angles (WPa/WPp 1.15±0.032).

Elytra ( Fig. 2 D). Moderately depressed along suture, comparatively short (LE/SBL 0.53±0.014) and narrow (WE/LE 0.64±0.021), without traces of striae. Humeri distinct, rounded, in outline forming obtuse angle with longitudinal axis of body. Lateral margins subparallel, slightly divergent at basal half, evenly rounded to apex in apical half.

Male genitalia. Median lobe ( Fig. 7 P) with long shaft, arcuate ventral margin and short, slightly enlarged ventrally, apex with tapering, narrowly rounded, tip. Sclerites of internal sac adjoin to each other, the dorsal sclerite stylet-like, with ventral enlargement, markedly longer than ventral sclerite. Left paramere with short and conical apical constriction ( Fig. 7 R). Ring sclerite with moderately long, almost symmetrical handle, narrowly rounded at tip ( Fig. 8 E).

Female internal genitalia. Gonocoxite 2 with medial basal ridge smooth, and ensiform setae short ( Fig. 9 C, F). Spermatheca smaller than in other congeners, almost spherical, only slightly elongate ( Fig. 10 D). Length of spermathecal gland much greater than length of spermatheca. Spermathecal duct slightly wavy and very long.

Geographical distribution. This species is known only from a single locality, Glen Warren Reserve (= Roy Cooper Reserve) in Oamaru, South Island ( Fig. 11 , white circle).

Way of life. This species has been collected in the broadleaf forest, by using a soil washing technique.

Relationships. This species resembles its congeners from the North Island based on presence of an auxiliary tubercle anterior to the posterior angles of pronotum and in the structure of the median lobe. The small and rounded spermatheca is similar to that of females of Pelodiaetus sulcatipennis Jeannel.

Figures

FIGURE 1. SEM illustrations of body parts of Pelodiaetodes species. Head, dorsal aspect: A P. prominens; B P. nunni. Pronotum, dorsal aspect: C P. prominens, D P. nunni. Legend: ass – anterior supraorbital seta; bs – basilateral pronotal seta; cl – clypeus; cs – clypeal seta; fs – frontal seta; l – labrum; ls – midlateral pronotal seta; mg – marginal pronotal gutter; mp 3 – maxillary palpomere 3; mp 4 – maxillary palpomere 4; pss – posterior supraorbital seta. Scale bars = 0.1 mm.

FIGURE 2. SEM illustrations of structural features of Pelodiaetodes species. Basal part of left elytron, dorsal aspect: A P. prominens; B P. nunni. Elytra, dorsal aspect: C P. prominens, D P. nunni. Legend: axt – auxillar tubercle; bm – basal margin; ed 2 – scutellar seta; ed 3 – ed 6 – discal elytral setae; ed 8 – apical elytral seta; eo 1 – 9 – setae 1 – 9 from the umbilicate series; eg – elytral groove; lb – lateral pronotal bead; sct – scutellum. Scale bars = 0.2 mm.

FIGURE 5. Digital images of habitus of Pelodiaetodes species, dorsal aspect. A P. prominens (NZ, Northland, Waipoua Forest); B P. constricticollis (NZ, Northland, Radar Bush), paratype; C P. aldermensis (NZ, Waikato, Aldermen Islands), paratype; D P. moorei (NZ, Northland, Poor Knight Islands), paratype; E P. moorei (NZ, Northland, Puketi Forest); F P. nunni (NZ, Otago, Oamaru), paratype. Scale bar = 1 mm.

FIGURE 7. Line drawings of male aedeagus of Pelodiaetodes species. P. prominens (NZ, Northland, Omahuta Forest): A median lobe, right lateral aspect; B left paramere, left lateral aspect; C right paramere, right lateral aspect. P. constricticollis (NZ, Northland, Radar Bush): D median lobe, right lateral aspect; E left paramere, left lateral aspect; F right paramere, right lateral aspect. P. moorei (NZ, Northland, Poor Knight Islands): G median lobe, right lateral aspect; H left paramere, left lateral aspect; I right paramere, right lateral aspect. P. moorei (NZ, Northland, Puketi Forest): J median lobe, right lateral aspect; K left paramere, left lateral aspect; L right paramere, right lateral aspect. P. aldermensis (NZ, Waikato, Aldermen Islands): M median lobe, right lateral aspect; N left paramere, left lateral aspect; O right paramere, right lateral aspect. P. nunni (NZ, Otago, Oamaru): P median lobe, right lateral aspect; R left paramere, left lateral aspect; S right paramere, right lateral aspect. Legend: dp – dorsal plate; vp – ventral plate. Scale bar = 0.1 mm.

FIGURE 8. Line drawings of ring sclerite of Pelodiaetodes species, male genitalia, dorsal aspect. A P. prominens (NZ, Northland, Omahuta Forest). B P. constricticolllis (NZ, Northland, Radar Bush). C P. aldermensis (NZ, Waikato, Aldermen Islands). D P. moorei (NZ, Northland, Poor Knight Islands). E P. nunni (NZ, Otago, Oamaru). Legend: hd – handle of ring sclerite. Scale bar = 0.1 mm.

FIGURE 9. SEM illustrations of ovipositor sclerites of Pelodiaetodes species. A – B right ovipositor sclerite, lateral aspect; C – D right gonocoxite 2, ventral aspect. A, D P. prominens; B, E P. moorei; C, F P. nunni. Legend: mbr – medial basal ridge of gonocoxite 2, bla – blade of gonocoxite 2, les – lateral ensiform seta; gc 1 – gonocoxite 1; gc 2 – gonocoxite 2; lt – laterotergite; mes – medial ensiform seta; ns – nematiform seta. Scale bars: A – C = 0.05 mm; D – F = 0.02 mm.

FIGURE 10. Line drawings of spermatheca, spermathecal duct, and spermathecal gland of Pelodiaetodes species. A P. prominens (NZ, Northland, Waipoua Forest). B P. moorei (NZ, Northland, Poor Knight Islands). C P. aldermensis (NZ, Waikato, Aldermen Islands). D P. nunni (NZ, Otago, Oamaru). Legend: sd – spermathecal duct; sg – spermathecal gland; sp – spermatheca. Scale bar = 0.05 mm.

FIGURE 11. Map of New Zealand, showing positions of locality records for Pelodiaetodes species: P. prominens – red circles; P. constricticollis – yellow diamond; P. moorei – blue quadrangles; P. aldermensis – pink triangle; P. nunni – white circle.