Pelodiaetodes aldermensis, 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 : 573-574

Pelodiaetodes aldermensis , sp. n.

Figs. 3 BDFJ, 5C, 6E, 7M–O, 8C, 10C, 11

Type material. HOLOTYPE, male, in NZAC, point-mounted, dissected, labeled: \ Ruamahuati I. Aldermen Is. CL 12 Nov. 72 G.W. Ramsay \ Litter 72/202 \ Entomology Division D.S.I.R. New Zealand \ Pelodiaetodes prominens det.B.P. Moore\ N.Z. Arthropod Collection, NZAC Private Bag 92170 Auckland New Zealand \.

PARATYPES (5 examples, 4 exx. dissected), 3 males and 1 female labeled same as holotype; 1 female labeled: \ Hongiora I. Aldermen Is. CL 11 Nov. 72 D.Merton \ Litter 72/194 \ Entomology Division D.S.I.R. New Zealand \ Pelodiaetodes prominens det.B.P. Moore \ N.Z. Arthropod Collection, NZAC Private Bag 92170 Auckland New Zealand \.

Specific epithet. The specific epithet is a Latinized adjective in the masculine form based on the name of the Aldermen Islands, from which the new species is described.

Type locality. New Zealand, North Island, Coromandel, Aldermen Islands.

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

Description. Size. Medium- to large-sized for genus (SBL range 1.52–1.80 mm, mean 1.63± 0.103 mm, n=5).

Habitus. Body form subdepressed, subparallel, markedly elongate (WE/SBL 0.37±0.014), head large for genus compared to pronotum (WH/WPm 0.81±0.023), pronotum narrow in comparison to elytra (WPm/WE 0.76±0.033).

Color. Body color brunneorufous, appendages testaceous.

Prothorax. Pronotum ( Fig. 6 E) moderately long (LP/LE 0.44±0.012) and moderately elongate (WPm/LP 1.20±0.052), with lateral margins shallowly sinuate and markedly constricted posteriorly (WPm/WPp 1.51±0.070). Anterior angles prominent, posterior angles slightly obtuse (110–120°). Width between anterior angles much greater than between posterior angles (WPa/WPp 1.22±0.043).

Elytra. Moderately depressed along suture, comparatively short (LE/SBL 0.54±0.016) and moderately wide (WE/LE 0.69±0.025), 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 M) with long shaft, arcuate ventral margin and elongate apex with acute tip. Sclerites of internal sac remote from each other, the dorsal sclerite bifurcated apically, markedly longer than ventral sclerite. Left paramere with short and conical apical constriction ( Fig. 7 N). Ring sclerite with slightly long and slightly asymmetrical handle, narrowly rounded at tip ( Fig. 8 C).

Female internal genitalia. Goncoxite 2 with prominent medial basal ridge and long ensiform setae. Spermatheca weakly sclerotized, elongate, of pot shape with enlarged basal half ( Fig. 10 C). 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 the Aldermen group of islets, namely Ruamahuaiti and Hongiora islets, located off the coast of the Coromandel Peninsula in the North Island ( Fig. 11 , pink triangle).

Way of life. This species has been collected in litter, without precise indication of the type of vegetation.

Relationships. The acute tip of the median lobe of the aedeagus is similar to that of males of P. prominens .

Figures

FIGURE 3. SEM illustrations of structural features of legs of Pelodiaetodes species, various aspects. A – B protarsus: A left protarsus of P. nunni, ventral aspect; B right protarsus of P. aldermensis, ventral aspect. C – D protibia: C left protibia of P. nunni, ventral aspect; D left protibia of P. aldermensis, medial aspect. E – H mesotibia: E right mesotibia of P. prominens, dorsal aspect; F right mesotibia of P. aldermensis, dorsal aspect; G right mesotibia of P. moorei, dorsal aspect; H left mesotibia of P. nunni, dorsal aspect. I – L metatibia: I right metatibia of P. prominens, dorsal aspect; J left metatibia of P. aldermensis, dorsal aspect; K left metatibia of P. moorei, dorsal aspect; L left metatibia of P. nunni, dorsal aspect. Legend: ac – antenna cleaner; as – adhesive seta; asp – anterior spur; asr – anterior setal row; cls – clip seta; msb – mesotibial brush; msms – mesotibial modified seta; mss – mesotibial spur; mtb – metatibial brush; mtms – metatibial modified seta; mts – metatibial spur; psp – posterior spur; psr – posterior setal row; sb – setal band; ta 1 – ta 4 – tarsomeres 1 – 4. Scale bars = 0.02 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 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 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.