Ctenognathus garnerae Larochelle and Larivière, 2021

Larochelle & Larivière, Marie-Claude, 2021, Synopsis of the tribe Platynini in New Zealand (Coleoptera: Carabidae), Insecta Mundi 2021 (864), pp. 1-96 : 35-36

Ctenognathus garnerae Larochelle and Larivière , new species

Fig. 57 , 100 , 132

Ctenognathus garnerae Larochelle and Larivière , new species. Holotype: male (NZAC) labeled “[ NEW ZEALAND TH] Three Kings Is Great I. Nov. 70 NZ. Ent. Div. Exp. (typed) / Castaway Camp (typed) / G. Kuschel (typed) / ex. crevices in coastal cliffs. (hand-written) / HOLOTYPE [male symbol] Ctenognathus garnerae Larochelle & Larivière, 2021 (red label; typed).” Paratypes: one female (NZAC) and one male (MONZ) from the same locality as the holotype, bearing blue paratype labels.

Description. Body length 11.4–12.8 mm. Head, pronotum, and elytra black; abdomen rufopiceous; antennal segments 1–4 rufopiceous, 5–11 reddish; palpi reddish; femora and tibiae rufopiceous; tarsi reddish. Microsculpture very transverse (with microlines) on head and pronotum, isodiametric on elytra. Iridescence present on pronotum. Very shiny on head and pronotum, moderately shiny on elytra. Forebody moderately wide in comparison to elytra. Head. Moderately wide. Mandibles very long, slightly curved anteriorly. Labrum strongly transverse, moderately emarginate anteriorly. Eyes moderately convex; two setiferous punctures on inner side of each eye. Tempora not inflated. Neck constriction shallow dorsolaterally. Mentum: medial tooth entire, rounded apically; two setae. Submentum with four setae. Palpi with terminal segment obtuse apically. Thorax. Pronotum slightly convex, impunctate, obsoletely wrinkled on disc and across apex, wide, moderately cordate, widest before middle; apex strongly emarginate; anterolateral angles well developed, broadly rounded; anterior bead incomplete, obsolete medially; sides strongly rounded, moderately sinuate posteriorly; lateral beads incomplete, obsolete anteriorly; lateral depressions narrow, slightly widened from apex to base; a single setiferous puncture on each side (anteriorly); posterolateral angles obtuse; laterobasal foveae moderately deep and wide, prolonged forward; posterior bead obsolete; base emarginate. Legs. Moderately long. Metafemora with two posteroventral setae. Meso- and metatarsomeres 1–4 poorly developed, not carinate dorsally, deeply bisulcate laterally. Metatarsomeres 4 moderately bilobed and asymmetrical apically. Metatarsomeres 5 glabrous ventrally. Elytra. Slightly convex, not sloping down toward apex, oblong, widest about middle. Shoulders slightly rounded. Sides moderately rounded. Scutellar setiferous pore invisible. Scutellar striole short, impunctate. Striae deep, impunctate. Intervals moderately convex; interval 3 with a single very deep, large (foveate) subapical setiferous puncture. Umbilicate series with 21 setiferous punctures. Subapical sinuations moderately strong. Apices obtusely rounded. 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 ten long apical ambulatory setae. Aedeagus. Lateral view ( Fig. 100 ): strongly arcuate, moderately wide; base strongly convex dorsally, with basal lobe moderately wide; middle moderately convex, slightly concave in apical half dorsally, strongly concave ventrally, with dorsal membranous area moderately wide and moderately long; apex strongly convex dorsally, slightly concave ventrally, with extreme tip moderately wide and long. Dorsal view: narrow, asymmetrical (ostium of membranous area deflected to the left); basal bulb moderately distant from membranous area.

Material examined. 19 specimens ( MONZ, NZAC).

Geographic distribution ( Fig. 132 ). Offshore Islands: TH–Great Island, Castaway Camp.

Ecology. Coastal lowland. Epigean, fossorial. Sea cliffs and adjacent forests. Open or shaded ground; dry soil. Nocturnal; hides during the day in rock crevices. Gregarious.

Biology. Seasonality: November. Tenerals: September. Predacious (based on mouthpart morphology).

Dispersal power. Subapterous (incapable of flight). Moderate runner.

Collecting techniques. Examining rock crevices; pan trapping (yellow pan traps).

Remarks. This species is named after our friend and colleague Beulah Garner (The Natural History Museum, London (BMNH)) for facilitating our study of the type material of Carabidae , especially the Broun Collection. Ctenognathus garnerae is morphologically close to C. tepaki . In addition to diagnostic characters of the male genitalia, C. garnerae has the following distinguishing features: antennal segments 1–4 rufopiceous, 5–11 reddish; mandibles very long, slightly curved anteriorly; pronotum with lateral depressions narrow and slightly widened from apex to base, posterolateral angles obtuse; metatarsomeres 5 glabrous ventrally. The two species are allopatric: C. garnerae is restricted to the Three Kings Islands (TH), while C. tepaki occurs in northernmost areas of the North Island (ND, top of Aupouri Peninsula).

Figures

Figures 57–60. Dorsal habitus. 57) Ctenognathus garnerae new species. 58) C. tepaki new species. 59) C. urewera new species. 60) C. cardiophorus. Scale line = 1 mm.

Figures 94–100. Aedeagus, lateral. 94) Kupeplatynus crenatus. 95) K. lucifugus. 96) Tuiplatynus sophronitis. 97) T. libitus. 98) Ctenognathus novaezelandiae. 99) C. elevatus. 100) C. garnerae new species.

Figures 130–135. Species distribution maps. 130) Ctenognathus edwardsii. 131) C. elevatus. 132) C. garnerae new species. 133) C. helmsi. 134) C. hoarei new species. 135) C. intermedius.