Bembidion (Zeplataphus) dehiscens Broun, 1893

Larochelle, André, Zeperyphodes, Broun & Larivière, Marie-Claude, 2015, Synopsis of the genus Bembidion Latreille in New Zealand (Coleoptera: Carabidae: Bembidiini), Insecta Mundi 2015 (415), pp. 1-78 : 28

Bembidion (Zeplataphus) dehiscens Broun, 1893

Fig. 18 , 51 , 81

Bembidium dehiscens Broun, 1893: 1009 . Type locality: Pakuratahi Stream [=River], Rimutaka Range,

WN ( Broun 1893: 1009); Rimutaka Range, WN ( Lindroth 1976: 173), lectotype designated). Other synonymy as in Larochelle and Larivière (2001: 84).

Description. Body length 6.2–9.0 mm. Black; antennae and legs piceous to rufous (antennal segment 1, when rufous, infuscated above). Microsculpture of elytra moderately strong, irregularly isodiametric. Moderately shiny, with moderately strong metallic lustre (aeneous). Thorax. Pronotum moderately convex; thin raised lateral bead incomplete, obsolete near posterolateral angles; sides slightly rounded anteriorly, slightly sinuate posteriorly; posterolateral angles subrectangular, moderately projected laterally, somewhat sharp at tip; laterobasal foveae very deep, oblong, short, not reaching basal margin. Elytra. Subdepressed, elongate. Scutellar striole consisting of a row of punctures. Striae 2–6 incomplete (evanescent apically), shallow, finely punctate; stria 7 strong, incomplete, finely punctate. Intervals depressed; interval 3 with four or five setiferous punctures. Apical striole deep, connected to stria 5. Sutural apices rounded. Abdomen. Last visible sternum (sternum VII) of female with four long ambulatory setae only. Aedeagus. Lateral view ( Fig. 51 ): moderately arcuate; base moderately concave dorsally; middle mostly narrow and subparallel; apex triangular, with extreme tip moderately narrow and long.

Material examined. 711 specimens ( CMNH, JNNZ, LUNZ, MONZ, NZAC).

Geographic distribution ( Fig. 81 ). North Island: BP, GB, HB, RI, TO, WA, WI, WN. South Island: BR, FD, KA, MB, MC, NC, NN, OL, SD, WD.

Ecology. Lowland, montane, subalpine. Epigean. Banks of big rivers, close to the water. Open ground; wet, gravelly or gravelly-stony, bare soil. Nocturnal; hides during the day deep among gravel and under stones. Gregarious.

Biology. Seasonality: September–April, June. Tenerals: November–March. Often infested with fungi (Laboulbeniales). Defence mechanism: when alarmed, the adult escapes by running or flying short distances.

Dispersal power. Macropterous, capable of flight. Occasional flier. Fast runner. Vagility favoured by flight capacity.

Collecting techniques. Raking the soil; turning stones.

Reference. Larochelle and Larivière 2001: 84 (catalogue; biology, dispersal power, ecology, geographic distribution, reference).

Figures

Figures 17–20. Dorsal habitus. 17) Bembidion charile. 18) B. dehiscens. 19) B. actuarium. 20) B. musae. Scale line = 1 mm.

Figures 45–52. Aedeagi, lateral. 45) Bembidion brullei. 46) B. rotundicolle. 47) B. tairuense. 48) B. granuliferum. 49) B. maorinum maorinum. 50) B. charile. 51) B. dehiscens. 52) B. actuarium.

Figures 77–82. Species distribution maps. 77) Bembidion callipeplum. 78) B. chalceipes. 79) B. chalmeri. 80) B. charile. 81) B. dehiscens. 82) B. embersoni.