Notagonum Darlington, 1952

Larochelle & Larivière, Marie-Claude, 2021, Synopsis of the tribe Platynini in New Zealand (Coleoptera: Carabidae), Insecta Mundi 2021 (864), pp. 1-96 : 7-8

Genus Notagonum Darlington, 1952

Fig. 38–41 , 81–84 , 155–158

Notagonum Darlington, 1952: 127 .

Type species. Notagonum externum Darlington, 1952 , by original designation.

Description ( New Zealand). Body length 7.3–10.4 mm. Color mostly dark. Metallic luster present. Dorsal surface mostly glabrous. Forebody moderately wide in comparison to elytra. Head. Moderately wide. Mandibles moderately long. Labrum emarginate or subtruncate anteriorly. Eyes strongly convex, touching buccal fissures; two setiferous punctures on inner side of each eye. Tempora not inflated. Neck constriction shallow dorsolaterally. Mentum tooth entire, acute apically; two small circular foveae; two long setae. Submentum with four long setae. Palpi with terminal segment obtuse apically. Ligula with two setae. Paraglossae glabrous. Thorax. Pronotum transverse, cordate, subquadrate, or rectangular; two setiferous punctures (anterior and posterior) on each side. Prosternum glabrous apically, not compressed into a vertical ridge. Legs. Moderately long (very long in N. submetallicum ). Metacoxae with two posteroventral setae. Metafemora with two posteroventral setae. Protibiae with dorsal longitudinal groove; cleaning organ with two clip setae. Meso- and metatarsomeres 1–4 poorly developed, not carinate dorsally, shallowly bisulcate laterally. Metatarsomeres 4 moderately bilobed, symmetrical apically. Metatarsomeres 5 glabrous or setose ventrally. Elytra. Oblong (pear-shaped in N. chathamense ). Free along suture (hindwings fully developed) or fused (hindwings about half developed in N. chathamense ). Basal margin complete, reaching about scutellum. Shoulders broad (narrow in N. chathamense ), rounded. Sides widest behind middle. Scutellar setiferous pore visible. Scutellar striole very long. Striae complete, consisting of impressed lines. Interval 3 with three setiferous punctures. Umbilicate series with 15–19 setiferous punctures. Apices obtuse. Abdomen. Sterna IV–VI: both sexes with two long apical ambulatory setae. Sternum VII (last visible sternum): male with two long apical ambulatory setae; female with four long apical ambulatory setae. Aedeagus. Lateral view: moderately or strongly arcuate; basal lobe of basal bulb present; internal sac without scale-like sclerites. Dorsal view: narrow, symmetrical (ostium of membranous area dorsal); basal bulb close to membranous area.

References. Larochelle and Larivière 2001: 137–138 (catalogue), 2007: 81 (description, ecology, geographic distribution, references), 2016: 38 (list); Baehr 2016: 1–24 (revision, Notagonum-submetallicum -complex).

Remarks. The genus Notagonum is known from Indonesia, New Guinea, Fiji, Samoa, New Caledonia, Australia (including Tasmania), Norfolk Island, Lord Howe Island, and New Zealand where it is represented by four endemic species occurring on the North Island, South Island, Stewart Island, and two offshore islands (TH, CH). Notagonum Darlington seems to be a genus of convenience or a paraphyletic taxon ( Darlington 1952; Liebherr 2005). Notagonum marginellum (Erichson, 1842) was deleted from the New Zealand fauna by Larochelle and Larivière (2007: 81); this species occurs in Tasmania, southern mainland Australia, and on Lord Howe Island ( Baehr 2016: 1).

Figures

Figures 37–40. Dorsal habitus. 37) Platynus macropterus. 38) Notagonum chathamense. 39) N. lawsoni. 40) N. feredayi. Scale line = 1 mm.

Figures 41–44. Dorsal habitus. 41) Notagonum submetallicum. 42) Prosphodrus mangamuka new species. 43) P. waltoni. 44) P. sirvidi new species. Scale line = 1 mm.

Figures 80–86. Aedeagus, lateral. 80) Platynus macropterus. 81) Notagonum chathamense. 82) N. lawsoni. 83) N. feredayi. 84) N. submetallicum. 85) Prosphodrus mangamuka new species. 86) P. waltoni.

Figures 154–159. Species distribution maps. 154) Maoriplatynus marrisi new species. 155) Notagonum chathamense. 156) N. feredayi. 157) N. lawsoni. 158) N. submetallicum. 159) Platynus macropterus.