Bembidion (Zemetallina) stewartense Lindroth, 1976

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 : 38

Bembidion (Zemetallina) stewartense Lindroth, 1976

Fig. 27 , 60 , 97

Bembidion (Zemetallina) anchonoderum stewartense Lindroth, 1976: 187 . Type locality: Stewart Island. Bembidion stewartense: Emberson, 1993: 13 .

Description. Body length 3.4–3.8 mm; stout (slender in other Zemetallina species). Black; elytra black with rufous epipleura; antennae (segment 1 pale rufous, only slightly infuscated above); legs rufous. Microsculpture very strong, isodiametric. Shiny, with strong metallic lustre (bronzy, greenish, rarely bluish). Forebody very wide in comparison to elytra. Head. Antennae submoniliform, rather short (reaching about elytral base). Thorax. Pronotum moderately convex, very wide; sides moderately rounded anteriorly, moderately sinuate posteriorly; posterolateral angles subrectangular, somewhat obtuse at tip; laterobasal foveae moderately deep, linear, moderately long, not reaching basal margin. Epipleura (in dorsal view) not exposed in front of posterolateral angles. Elytra. Moderately convex, ovate, very wide, widest about middle. Shoulders moderately rounded. Sides strongly rounded. Scutellar striole consisting of a row of punctures. Striae 2–6 complete, deep (even apically), strongly punctate; stria 7 strong, incomplete, coarsely punctate. Intervals slightly convex. Apical striole deep, connected to stria 5 or 7; preapical setiferous puncture not isolated. Abdomen. Last visible sternum (sternum VII) of female with four long ambulatory setae only. Aedeagus. Lateral view ( Fig. 60 ): strongly arcuate; base almost straight dorsally; middle rather strongly convex dorsally, very slightly concave ventrally; apex narrow, almost straight dorsally and ventrally, with extreme tip narrow and short.

Material examined. 9 specimens ( NZAC).

Geographic distribution ( Fig. 97 ). Stewart Island: Mason Bay.

Ecology. Lowland. Epigean. Bare stream banks. Gregarious. Diurnal; active on mat plants.

Biology. Seasonality: February. Tenerals: February. One specimen infested with fungi (Laboulbeniales).

Dispersal power. Macropterous, probably capable of flight. Moderate runner. Vagility likely favoured by flight capacity.

Reference. Larochelle and Larivière 2001: 82 (catalogue; biology, dispersal power, ecology, geographic distribution, references).

Figures

Figures 25–28. Dorsal habitus. 25) Bembidion tekapoense. 26) B. anchonoderus. 27) B. stewartense. 28) B. parviceps. Scale line = 1 mm.

Figures 53–60. Aedeagi, lateral. 53) Bembidion musae. 54) B. orbiferum. 55) B. giachinoi. 56) B. callipeplum. 57) B. nesophilum. 58) B. tekapoense. 59) B. anchonoderus. 60) B. stewartense.

Figures 95–100. Species distribution maps. 95) Bembidion rotundicolle. 96) B. solitarium. 97) B. stewartense. 98) B. tairuense. 99) B. tekapoense. 100) B. tepaki new species.