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

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Pelodiaetodes aldermensis

sp. n.

Pelodiaetodes aldermensis  , sp. n.

Figs. 3View FIGURE 3 BDFJ, 5 C, 6 E, 7 M –O, 8 C, 10 C, 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. 5View FIGURE 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. 6View FIGURE 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. 7View FIGURE 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. 7View FIGURE 7 N). Ring sclerite with slightly long and slightly asymmetrical handle, narrowly rounded at tip ( Fig. 8View FIGURE 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. 10View FIGURE 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. 11View FIGURE 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  .


New Zealand Arthropod Collection