Bembidion (Desarmatocillenus) yakushimanum, Sasakawa, 2007

Sasakawa, Kôji, 2007, Taxonomic studies on the Bembidion (‘ Cillenus’) complex (Coleoptera: Carabidae): A revision of the subgeneric taxonomy and description of a new species from Japan, Zootaxa 1575 (1), pp. 35-45 : 42

Bembidion (Desarmatocillenus) yakushimanum sp. nov.

( Figs. 4, 6, 8 , 10 , 19, 24 )

Armatocillenus (Corallicillenus) tsutsuii (part): Nakane 1956: 103. Nakane 1963: 26.

Bembidion (Corallicillenus) tsutsuii (part): Lindroth 1980: 188.

Armatocillenus tsutsuii (part): Morita 1985: 92. Morita 1993: 17.

Cillenus (Corallicillenus) tsutsuii (part): Marggi et al. 2003.

Diagnosis. Similar to B. tsutsuii ( Figs. 5 , 11 , 20 ), but distinguished by blackish elytra ( Fig. 4 ) and a narrower aedeagal apex ( Fig. 10 ).

Description. Body length (measured from mandible apices to elytral end): ♂, 4.12–4.27 mm (mean ± SD: 4.19 ± 0.074 mm) n=4; ♀, 4.14 mm, n=1. Dorsal surface of head, pronotum, elytral lateral margins and interval 1 reddish brown, remaining elytra blackish brown. Appendages light brown except for blackish brown to black inner margin of mandible apex.

Head ( Fig. 4 ) longer than wide, with length from mandible apex to neck base 1.28–1.35 times longer than width between eyes; left mandible slightly convex at subapical inner margin; eyes moderate and almost flat, with the posterior edges in front of the posterior supraorbital setae.

Pronotum ( Fig. 4 ) 1.33–1.39 times wider than long; maximum width 1.19 times wider than anterior margin; 1.40–1.43 times wider than posterior margin; anterior angles notably produced, with apices narrowly rounded; hind angles right to somewhat acute.

Elytra ( Fig. 4 ) almost parallel-sided, 1.56–1.63 times longer than wide, with lateral margins weakly arcuate throughout; shoulders distinct; anterior discal setigerous puncture on basal 2/5, posterior one on apical 1/4; outermost intervals truncate and denticulate at subapical angle ( Fig. 6 ). Hind trochanter ( Fig. 8 ) short, about 1/ 3 as long as hind femur; apex rounded. Hind wings reduced.

Aedeagus ( Fig. 10 ) with apex relatively narrow. Parameres each with 2 setae at apex. Endophallus ( Fig. 19 ) with 3 lobes; ventromedian lobe small; dorsomedian lobe large, with apex narrowly rounded; gonoporal lobe small.

Sclerotized part of spermathecal apex ( Fig. 24 ) two times longer than wide.

Type materials. Holotype, ♂, ‘ Anbo , Yaku Is. Kagoshima Pref. 22. VII. 1984 M. Tao leg. ’; Paratypes, 3♂♂ 1♀, same data as holotype. Deposited in the collection of NSMT .

Etymology. Named after the type locality, Yakushima Island, Kagoshima Prefecture, Japan.

Figures

FIGURES 1–9. Habitus (1–5), elytral outermost intervals (6–7), and hind trochanter (8-9) of representative Bembidion species. 1. B. sinicum, male; 2. B. yokohamae, male (Heguri-gawa Riv); 3, 9. B. aestuarii, male (Rv. Obitsugawa). 4, 8. B. yakushimanum, holotype male; 5. B. tsutsuii, male; 6. B. yakushimanum, paratype female. 7. B. aestuarii, female (Riv. Tama). Arrows indicate posterior end of elytral outermost-intervals. Scales: 2.0 mm for 1, 1.0 mm for 2–5, 0.5 mm for 6– 9.

FIGURES 10–11. Aedeagus of Bembidion yakushimanum (10, left lateral view) and B. tsutsuii (11, left lateral view of apical part). Scale: 0.25 mm.

FIGURES 12–24. Endophalli (left anterolateral view, right lateral view) of Bembidion spp. (12–21) and an outgroup species, Blemus discus (22), and spermathecae of Bembidion spp. (23–24). 12, 23. B. sinicum; 13. B. kasaharai; 14. B. seticorne; 15. B. yokohamae; 16. B. aestuarii; 17. B. sumaoi; 18. B. tokunoshimanum; 19, 24. B. yakushimanum; 20. B. tsutsuii; 21. B. umi. Note that the endophallus of B. yokohamae (15) is not fully inflated because of damage during dissection. Numbers indicate character-number and character-state in Table 1. Scales: 0.25 mm.