Bembidion (Armatocillenus) sauteri ( Jedlička, 1954 )

Toledano, Luca, 2009, Notes on the Bembidiina of Taiwan with description of three new species (Coleoptera: Carabidae), Acta Entomologica Musei Nationalis Pragae 49 (2), pp. 577-598 : 580

Bembidion (Armatocillenus) sauteri ( Jedlička, 1954)

( Fig. 1 )

Armatocillenus sauteri Jedlička, 1954: 225 . Bembidion (Armatocillenus) sauteri: JEDLIČKA (1965) : 157. Cillenus (Armatocillenus) sauteri: MARGGI et al. (2003) : 272; LORENZ (1998): 200; LORENZ (2005): 216. Armatocillenus sauteri: TERADA et al. (2005) : 170; TERADA (2006): 11.

Type material examined. HOLOTYPE: ♀, ‘ Formosa, Sauter // Anping, 1909.X. // Typus [red] // Armatocillenus sauteri n.sp. [handwritten], det. ING. JEDLIČKA [pink]’ ( HNHM).

Diagnosis. A “ Cillenus -like” species, completely pale, with metatrochanter as long as two thirds of metafemur, pronotum with sides sinuate, thus differing from B. formosanum Dupuis, 1812 (type seen: Taiwan, NMPC).

Redescription. Body length 4.24 mm. Completely pale except for dark eyes and slightly infuscate apices of mandibles ( Fig. 1 ).

Head wide, almost as wide as pronotum. Frontal furrows rather deep, short, posteriorly ending at the level of middle of eyes and not extending to clypeus. Eyes rather convex. Antennae short (bl/al = 2.12). Penultimate article of maxillary palpi long, conical, truncated at apex; last article very small. Mandibles strongly developed.

Pronotum (pw/pl = 1.20; ew/pw = 1.23) slightly transverse, with anterior angles not protruding, sides gently rounded with long, slight sinuosity before the obtuse hind angles. Lateral channel sharp from anterior angle to posterior third, then progressively widening and deepening, adjacent to gently raised, triangular carina in posterior third. Anterior transverse impression and median line superficial. Posterior transverse impression very deep, ending at sides in two superficial basal foveae. Posterior margin rectilinear at middle, gently oblique at sides. Lateral pronotal seta in advanced position, at about the anterior fifth, hind pronotal seta at hind angle.

Elytra (el/ew = 1.98) very narrow, widest slightly posterior to humeri, then gently narrowing and pointed at apex. Humeri strongly rounded, raised elytral margin reaching the beginning of stria 5 and angulate at the beginning of stria 7. Striae 1 to 8 deeply sulcate, complete, reaching apex, elytral intervals rather convex. Scutellar and apical stria long, apical stria being continuation of stria 5 toward elytral apex. Two discal elytral pores in lateral third of interval 3, anterior one slightly before middle of elytra and posterior one at about posterior fifth (pore on left elytron placed slightly more anteriorly than that on right elytron in the holotype).

Metasternal process unbordered.

Metatrochanter as long as two thirds of metafemur.

Microsculpture. Rather distinct, largely glossy, flat, isodiametric cells on entire dorsal surface.

Male unknown.

Distribution. So far known only from the type locality in Taiwan.

Remarks. Bembidion sauteri is probably related to the other Taiwanese species of the subgenus Armatocillenus , B. formosanum , given the extreme similarity in the elytral shape and coloration. Bembidion sauteri differs from B. formosanum mainly by the pronotal shape, which is intermediate between that of a “typical” Armatocillenus (not sinuate) and that of Desarmatocillenus (sinuate). Since the pronotal shape is one of the main diagnostic characters used to separate Armatocillenus from Desarmatocillenus , an intermediate character in B. sauteri suggests that both subgenera should be synonymized, keeping as valid the older name of Armatocillenus, But I refrain from taking this decision here. The most closely related taxon to B. sauteri seems to be an undescribed Chinese species (L. Toledano, unpublished data).

Figures

Figs.1–5. Bembidion spp., habitus. 1 – B. (Armatocillenus) sauteri Jedlička, 1954, holotype; 2 – B. (Desarmatocillenus) foochowense Lindroth, 1980; 3 – B. (Odontium) fusiforme Netolitzky, 1914; 4 – B. (Plataphus) takasagonis Habu, 1973; 5 – B. (Blepharoplataphus) teradai sp. nov., holotype.