Bembidion (Zeactedium) giachinoi Toledano, 2005

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 : 32-33

Bembidion (Zeactedium) giachinoi Toledano, 2005 new status

Fig. 22 , 55 , 83

Bembidium orbiferum giachinoi Toledano, 2005: 123 . Type locality: “ New Zealand, North Island, Wanganui [=Whanganui] N.P., Wanganui [=Whanganui] River, Jerusalem”, RI.

Description. Body length 5.5–6.2 mm. Black; elytra bicolored, with wide yellowish lateral margins; antennae and legs yellowish. Microsculpture feeble, slightly transverse on head and pronotum; more strongly transverse on elytra in male; isodiametric on elytra in female. Moderately shiny, with metallic lustre (greenish). Head. Antennae very long (reaching about basal third of elytra). Thorax. Pronotum strongly convex; sides strongly rounded anteriorly, moderately sinuate posteriorly; basal constriction very short; posterolateral angles rectangular, sharp at tip; laterobasal foveae very deep, linear, short, not reaching basal margin. Elytra. Strongly convex. Sides parallel about middle. Striae deep, becoming shallower apically, coarsely punctate; stria 7 strong, coarsely punctate. Apical striole deep, connected to stria 7. Aedeagus. Lateral view ( Fig. 55 ): slightly arcuate, almost subparallel; base strongly convex dorsally with a slight concavity medially; middle slightly convex with dorsal membranous area wide and very long; apex subtriangular, straight dorsally and ventrally, with extreme tip rather narrow and short.

Material examined. 34 specimens ( JNNZ, LUNZ, NZAC).

Geographic distribution ( Fig. 83 ). North Island: GB–Mangatuna. RI–Komako, Pohangina River. Whanganui National Park (Arapoto Stream; Whanganui River, Jerusalem). RI/WI–Pohangina Valley, Makiekie Stream [= Creek] (near Utuwai, Makoura Road).

Ecology. Lowland, montane. Fossorial. River banks, at a certain distance (3–5 m) from water. Open ground; moist, soft, sandy (yellow), bare or sparsely vegetated soil. Nocturnal; hides during the day in the sand and under well embedded logs. Gregarious.

Biology. Seasonality: December–March. Tenerals: January–February. One specimen infested with fungi (Laboulbeniales). Defence mechanism: when alarmed, the adult escapes by running.

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

Collecting techniques. Pouring water over the ground; treading the soil with the feet; turning logs.

Reference. Toledano 2005: 123–125 (as Bembidion (Zeactedium) orbiferum giachinoi ; description, geographic distribution).

Remarks. Toledano (2005: 125) described a population of Bembidion from Jerusalem, RI (lower North Island) as B. orbiferum giachinoi stating that the male genitalia ( Fig. 39 in Toledano) are identical to those of the nominotypical form ( Bembidion orbiferum orbiferum ) from the South Island. A close examination of the male genitalia of both forms unequivocally demonstrates them as distinct species. In addition to diagnostic characters of the male genitalia, B. giachinoi has the following features that clearly separate it from B. orbiferum : smaller, body length 5.5–6.2 mm; microsculpture slightly transverse on head; antennae entirely yellowish; pronotum with sides moderately sinuate posteriorly and posterolateral angles rectangular; elytra parallel about middle, black with wide yellowish lateral margins. The geographic distribution of these two allopatric species may also assist their identification.

Figures

Figures 21–24. Dorsal habitus. 21) Bembidion orbiferum. 22) B. giachinoi. 23) B. callipeplum. 24) B. nesophilum. 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 83–88. Species distribution maps. 83) Bembidion giachinoi. 84) B. granuliferum. 85) B. hokitikense. 86) B. karikari new species. 87) B. mangamuka new species. 88) B. maorinum levatum.

Figures 37–44. Aedeagi, lateral. 37) Bembidion karikari new species. 38) B. albescens. 39) B. alacre. 40) B. tepaki new species. 41) B. waimarama new species. 42) B. puponga new species. 43) B. tillyardi. 44) B. chalmeri.