A review of the genus Pelodiaetus Jeannel (Coleoptera, Carabidae, Anillini) of New Zealand, with re-description of the genus, description of a new species, and notes on the evolutionary history Author Sokolov, Igor M. text ZooKeys 2019 879 33 56 http://dx.doi.org/10.3897/zookeys.879.37684 journal article http://dx.doi.org/10.3897/zookeys.879.37684 1313-2970-879-33 668885D2C2184402B4308672EC98E81E 19C55ED885CC5DD797A08E86976CB190 Pelodiaetus nunni sp. nov. Figs 1B, D , 2B, D , 4B , 6B , 7A-D , 8 Type material. HOLOTYPE, male, in NZAC, labeled: / New Zealand MC Ahuriri SR Port Hills 31 May 08 / Washed soil sample, broad-leaf forest / NZMS 260 M36: 797303 455m /. PARATYPES (7 specimens, in NZAC, JTN), 4 males and 2 females labeled same as holotype; 1 female labeled: / New Zealand MC Ahuriri SR Port Hills 7 Apr 07 / Washed soil sample, broad-leaf forest /. 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, Canterbury, Port Hills Range. Recognition. Adults of this species ( Fig. 6B ) are practically indistinguishable from the adults of P. sulcatipennis ( Fig. 6A ) and are distinguished from the latter by the structure of male and female genitalia. Figure 6. Digital images of habitus of Pelodiaetus species, dorsal aspect. A P. sulcatipennis (NZ, Otago, Outram) B P. nunni (NZ, Canterbury, Ahuriri Scenic Reserve). Scale bar: 1.0 mm. Description. With character states of the genus as summarized above. Size. Small to medium for genus (SBL range 1.25-1.32 mm, mean 1.30 +/- 0.028 mm, n = 6). Habitus. Body form subdepressed, subparallel, moderately elongate (WE/SBL 0.33 +/- 0.012), head comparatively wide for genus (WH/WPm 0.84 +/- 0.011), pronotum of moderate width in comparison to elytra (WPm/WE 0.83 +/- 0.045). Color. Body color rufo-testaceous, appendages testaceous. Prothorax. Pronotum moderately long (LP/LE 0.41 +/- 0.011) and comparatively elongate (WPm/LP 1.19 +/- 0.049), with lateral margins arcuately constricted posteriorly (WPm/WPp 1.48 +/- 0.059). Width between anterior angles slightly greater than between posterior angles (WPa/WPp 1.21 +/- 0.080). Elytra. Slightly depressed along suture, comparatively long (LE/SBL 0.57 +/- 0.004) and moderately narrow (WE/LE 0.58 +/- 0.019). Lateral margins slightly divergent at basal third, subparallel at middle and evenly rounded to apex in apical third. Male genitalia. Median lobe ( Fig. 7A ) with almost straight ventral margin and short apex with tapering tip. Sclerites of internal sac flagelliform, long, almost equal the length between apical and basal orifices, weakly sclerotized except basal enlargement. Figure 7. Line drawings of male genitalia and female spermathecae of Pelodiaetus species. P. nunni (NZ, Canterbury, Ahuriri Scenic Preserve): A median lobe, right lateral aspect B left paramere, left lateral aspect C right paramere, right lateral aspect D spermatheca. P. sulcatipennis (NZ, Otago, Outram): E median lobe, right lateral aspect F left paramere, left lateral aspect G right paramere, right lateral aspect H spermatheca. Abbreviations: ds - dorsal sclerites; sd - spermathecal duct; sg - spermathecal gland; sp - spermatheca. Scale bars: 0.1 mm ( A, B, C, E, F, G ); 0.05 mm ( D, H ). Female internal genitalia. Spermatheca weakly sclerotized, moderately elongate ( Fig. 7D ). Spermathecal duct long without coils. Attachments of spermathecal duct and gland to spermatheca close together. Geographic distribution. This species is known from the coastal Mid Canterbury area of Crosby et al. (1998) , where its distribution is limited by Port Hills Range ( Fig. 8 , white circles). Habitat. Specimens were collected from soil in a broadleaf forest. Relationships. Based on the structure of male genitalia and spermatheca P. nunni is postulated to be the sister, more derived taxon of P. sulcatipennis .