Pelodiaetodes constricticollis, 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 : 574-575

Pelodiaetodes constricticollis , sp. n.

Figs. 5 B, 6B, 7D–F, 8B, 11

Type material. HOLOTYPE, male, in NZAC, point-mounted, dissected, labeled: \ New Zealand ND Radar Bush Te Paki 4.12.95 \ in soil and litter, kauri forest \.

PARATYPES (1 example, dissected), 1 male labeled same as holotype.

Specific epithet. The specific epithet is a Latinized adjective in the masculine form and is derived from the Latin adjective constrictus meaning "contracted, compressed" and the Latin noun collum meaning “neck, stem”. The epithet refers to the shape of strongly constricted pronotum of the new species.

Type locality. New Zealand, North Island, Northland, Te Paki, Radar Bush.

Recognition. Adults of this species ( Fig. 5 B) are practically indistinguishable from the adults of P. prominens and P. aldermensis , described above, and males of P. constricticollis are distinguished from the males of the latter and other congeners by the structure of the median lobe.

Description. Size. Large-sized for genus (SBL range 1.67–1.76 mm, mean 1.72± 0.064 mm, n=2).

Habitus. Body form subdepressed, subparallel, markedly elongate (WE/SBL 0.35±0.016), head large for genus compared to pronotum (WH/WPm 0.81±0.016), pronotum of moderate width in comparison to elytra (WPm/WE 0.78±0.006).

Color. Body color brunneorufous, appendages testaceous.

Prothorax. Pronotum ( Fig. 6 B) moderately long (LP/LE 0.46±0.024) and markedly elongate (WPm/LP 1.13±0.008), with lateral margins shallowly sinuate and markedly constricted posteriorly (WPm/WPp 1.50±0.046). Anterior angles prominent, posterior angles nearly rectangular (100–110°). Width between anterior angles much greater than between posterior angles (WPa/WPp 1.23±0.035).

Elytra. Moderately depressed along suture, comparatively short (LE/SBL 0.52±0.011) and narrow (WE/LE 0.67±0.045), 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 D) with long shaft, almost straight ventral margin and markedly elongate apex with rounded tip. Sclerites of internal sac close to each other, the dorsal sclerite of stylet-like shape, slightly curved ventrally. Left paramere with long and subparallel apical constriction ( Fig. 7 E). Ring sclerite with moderately long, slightly asymmetrical handle, narrowly rounded at tip ( Fig. 8 B).

Female unknown.

Geographical distribution. This species is known only from Radar Bush (Te Paki Ecological District, Northland, North Island) ( Fig. 11 , yellow diamond).

Way of life. This species has been found in soil and litter of kauri ( Agathis australis (D. Don) Loudon ) forest.

Relationships. The rounded tip of the median lobe of males resembles that of P. m o ore i, described below. Pelodiaetodes constricticollis differs from that species in being larger and darker in color.

Figures

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 6. Digital images of pronota of Pelodiaetodes species. A P. prominens (NZ, Northland, Waipoua Forest); B P. constricticollis (NZ, Northland, Radar Bush), paratype; C P. moorei (NZ, Northland, Poor Knight Islands), paratype; D P. moorei (NZ, Northland, Puketi Forest); E P. aldermensis (NZ, Waikato, Aldermen Islands), paratype; F P. nunni (NZ, Otago, Oamaru), paratype. Scale bars = 0.5 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 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.