Notagonum lawsoni ( Bates, 1874 )

Larochelle & Larivière, Marie-Claude, 2021, Synopsis of the tribe Platynini in New Zealand (Coleoptera: Carabidae), Insecta Mundi 2021 (864), pp. 1-96 : 9-10

Notagonum lawsoni ( Bates, 1874)

Fig. 39 , 82 , 157

Anchomenus Lawsoni Bates, 1874: 240 (redescribed in 1875: 304). Holotype: male (MNHN) labeled “[AK] Auckland (hand-written) / Anchom. Lawsoni Bates (hand-written).”

Agonum (Europhilus) lawsoni: Csiki 1931: 870 .

Notagonum lawsoni: Watt 1982: 297 .

Description. Body length 7.8–8.6 mm. Head, pronotum, and elytra mostly dark rufous; lateral margins of pronotum widely reddish, of elytra narrowly reddish; abdomen dark rufous; antennae dark rufous; palpi dark rufous (terminal segment reddish in apical third); legs dark rufous. Microsculpture isodiametric on head, very transverse (with microlines) on pronotum, and moderately transverse on elytra. Iridescence present on pronotum. Very shiny; metallic luster (bronze) feeble on head, moderate on pronotum and elytra. Head. Mandibles moderately curved anteriorly. Labrum moderately transverse, slightly emarginate anteriorly. Thorax. Pronotum moderately convex, impunctate, feebly wrinkled on disc, moderately cordate, widest before middle; apex moderately emarginate; anterolateral angles well developed, rounded; anterior bead complete; sides strongly rounded and subangulate anteriorly, slightly sinuate posteriorly; lateral beads complete; lateral depressions moderately wide; posterolateral angles obtuse; laterobasal foveae very deep, moderately wide, not prolonged forward; posterior bead incomplete, obsolete medially; base subtruncate. Legs. Moderately long. Metatarsomeres 5 glabrous ventrally. Elytra. Subdepressed, sloping down toward apex, oblong. Free along suture (hindwings fully developed). Shoulders broad, strongly rounded. Sides slightly rounded. Scutellar setiferous pore visible. Scutellar striole impunctate. Striae deep, impunctate. Intervals slightly convex; interval 3 with three shallow, minute setiferous punctures. Umbilicate series with 15–18 setiferous punctures. Subapical sinuations feeble. Aedeagus. Lateral view ( Fig. 82 ): strongly arcuate; base strongly convex dorsally, with basal lobe moderately wide; middle gradually widened from base to apex, slightly convex dorsally, moderately concave ventrally, with dorsal membranous area visible in basal half; apex subtriangular, straight dorsally and ventrally, with extreme tip very wide and moderately long.

Material examined. 1151 specimens ( AMNZ, CMNH, JNNZ, LUNZ, MNHN, MONZ, NZAC).

Geographic distribution ( Fig. 157 ). North Island: AK, BP, CL, GB, HB, ND, RI, TK, TO, WA, WI, WN, WO.

Ecology. Lowland, montane. Epigean, fossorial, arboreal, planticolous. Eutrophic marshes and ponds ( Typha , Juncus , Cyperaceae ); swamp forests (broadleaf, podocarp) crossed by streams; edges of streams, ponds, and lakes. Open or shaded ground; wet soil. Nocturnal; hides during the day at the base of plants, in leaf litter, under fallen branches, logs, and stones. Gregarious.

Biology. Seasonality: Throughout the year. Tenerals: November, January–February, April. Predacious (based on mouthpart morphology). Occasionally infested with fungi (Laboulbeniales).

Dispersal power. Macropterous. Occasional flier to artificial lights at night. Moderate runner. Occasional climber (on trees, shrubs, herbaceous plants).

Collecting techniques. Pitfall trapping; pan trapping (yellow pan traps); treading plants into water; sifting leaf litter; examining the bases of plants; turning fallen branches, logs, and stones.

References. Larochelle and Larivière 2001: 137 (catalogue; biology, dispersal power, ecology, geographic distribution, references), 2007: 114 (list), 2016: 38 (list).

Figures

Figures 37–40. Dorsal habitus. 37) Platynus macropterus. 38) Notagonum chathamense. 39) N. lawsoni. 40) N. feredayi. 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.