Pelodiaetodes prominens Moore

Sokolov, Igor M., 2015, Review of the species of Pelodiaetodes Moore (Coleoptera: Carabidae: Bembidiini: Anillina) of New Zealand, Zootaxa 3963 (4), pp. 561-582 : 576-577

Pelodiaetodes prominens Moore

Figs. 1 AC, 2AC, 3EI, 4, 5A, 6A, 7A–C, 8A, 9AD, 10A, 11

Examined material. Northland (19 examples, 6 exx. dissected): Waipoua S. F.; Omahuta SF; Mangamuka Summit.

Recognition. Externally adults of this species ( Fig. 5 A) are indistinguishable from the adults of other congeners. Males of P. prominens may be distinguished from males of other congeners by the structure of the median lobe.

Description. Size. Medium- to large-sized for genus (SBL range 1.47–1.72 mm, mean 1.59± 0.085 mm, n=7).

Habitus. Body form subdepressed, subparallel, markedly elongate (WE/SBL 0.38±0.009), head large for genus compared to pronotum (WH/WPm 0.79±0.013), pronotum narrow in comparison to elytra (WPm/WE 0.75±0.020).

Color. Body color brunneorufous, appendages testaceous.

Prothorax. Pronotum ( Fig. 1 C, 6A) moderately long (LP/LE 0.46±0.022) and moderately elongate (WPm/LP 1.17±0.031), with lateral margins shallowly sinuate and markedly constricted posteriorly (WPm/WPp 1.52±0.037). Anterior angles prominent, posterior angles slightly obtuse (110–120°). Width between anterior angles much greater than between posterior angles (WPa/WPp 1.24±0.034).

Elytra ( Fig. 2 C). Moderately depressed along suture, comparatively short (LE/SBL 0.53±0.020) and moderately wide (WE/LE 0.72±0.036), 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 A) with long shaft, arcuate ventral margin and elongate apex with acuminated tip. Sclerites of internal sac remote from each other, the dorsal sclerite bifurcated apically, similar in size to ventral sclerite. Left paramere with short and conical apical constriction ( Fig. 7 B). Ring sclerite with short, slightly asymmetrical handle, moderately rounded at tip ( Fig. 8 A).

Female internal genitalia. Gonocoxite 2 with prominent medial basal ridge and long ensiform setae ( Fig. 9 A, D). Spermatheca weakly sclerotized, elongate, of barrel shape, with slightly enlarged basal half ( Fig. 10 A). Length of spermathecal gland much greater than length of spermatheca. Spermathecal duct slightly wavy and very long.

Geographical distribution. As far as known this species inhabits areas, surrounding the Hokianga Harbour, in the western part of Northland ( Fig. 11 , red circles).

Way of life. This species has been collected by sifting forest litter and mosses from tree bases and ground.

Relationships. Males of this new species resemble males of P. aldermensis , described above, based on the tapering apex of the median lobe, but differ in the shape of the apical tip and larger size of the dorsal sclerite of the internal sac of the median lobe.

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.