Oodes ( Oodes ) echigonus Habu & Baba, 1960

13. Oodes ( Oodes) echigonus Habu & Baba, 1960 View in CoL

( Figs 16 View FIGURE 16 A–G, Figs 17 View FIGURE 17 A–F, Table 4)

Oodes echigonus Habu & Baba, 1960 View in CoL ( type loc.: ‘ Katamachi , Niigata Pref. ’).

References.

Oodes echigonus: Kasahara 1994: 94 View in CoL (distribution in Japan); Bousquet 1996: 474 (relationships with Nearctic congeners, distribution in China: ‘Nanking, Kiangsu province’); Lorenz 1998: 305; Bousquet 2003: 445; Lorenz 2005: 325; Hasegawa et al. 2015: 22 ( Japan, Aichi Prefecture); Bousquet 2017: 636.

Type material. Not examined. Holotype preserved in the Insect Museum of the National Institute for Agro–Environmental Science, Tsukuba (https://www.naro.affrc.go.jp/org/niaes/type/dbcarabidae/o_echigonus.html).

Topotype material. JAPAN: N i i g a t a Prefecture: 2♂♂, 1♀, ‘ Niigata Pref., Jyôetsu-shi, Ookata-ku, Katamachi 3.IX.1976, Seiji Morita leg.’ ( NMNHS); 1♂, same data, but collected 25.V.1991 ( NMNHS); 1♀, same data, but collected 2.VI.1991 ( NMNHS).

Other material examined. CHINA: I m p re c i s e localities: 8♂♂, 8♀♀, China ( IZAS, NMNHS). J i a n g x i Province: 1♀, Jiangxi, Liantang, field margin, 1953.8. ( IZAS).

TME: 22 specimens. TGE: 3♂♂, 1♀.

Diagnosis. Members of this species are readily distinguished from those of other Palaearctic Oodes by their larger size, more than 12.5 mm, and very low PA/PW ( Table 4).

Description. Habitus. Specimens of large size (BL: 12.8–15.0 mm, BW: 5.3–6.2 mm), with subovate, moderately convex body ( Figs 16A, B, D, F View FIGURE 16 ). Ratios and measurements. See Table 4. Color and luster. Body including palpi and legs black; antennae piceous to rufopiceous. Integument dorsally and ventrally moderately shiny, without iridescence. Punctuation. Dorsal surface without punctuation; sides of prosternum and metasternum, meso- and metepisternum densely punctate; proepisternum finely rugose; abdominal ventrites finely rugose and punctured. Head. Half or less than half as wide as pronotum (PW/HW: 2.00–2.16). Mentum tooth with distinct paramedial border ( Fig. 16C View FIGURE 16 ). Thorax. Pronotum with sides rounded toward posterior angles (PW/PB: 1.02–1.06); maximum width in posterior third; laterobasal impressions indistinct; base moderately sinuate; anterior angles rounded, moderately projected anteriorly. Prosternum with median longitudinal sulcus shallow; prosternal process with apex rounded and border nearly complete, reduced at apex ( Fig. 16E View FIGURE 16 ). Metepisternum longer than wide (MA/MM: 0.87–1.00), with lateral margin convex and coadunation with epipleuron rather long, located anteriorly ( Fig. 16G View FIGURE 16 ). Elytra. Apical sinuation weak, but distinct. Basal margin distinct laterally, forming a minute denticle at shoulder, disappearing medially at level between striae 2 and 3. Granulation in marginal furrow continuous. Parascutellar striola and stria 1 shallower than other striae, striola punctate as well as striae 1–4 anteriorly; stria 7 as distinct as stria 6. Intervals 1–7 rather flat, interval 8 convex. Legs. Metacoxal basal sulcus extending to lateral fourth. Male mesotibia not modified. Protarsomeres 1–3 of male moderately dilated, with second segment longer than wide (W/Lp2: 0.82–0.88). Male genitalia. Median lobe ( Figs 17A, B, C, D View FIGURE 17 ) with basal bulb short and narrow; angle between basal bulb and shaft nearly straight; shaft long and swollen; apex short, tapered and curved ventrally; apical lamella widely rounded; ostium long, but shorter than in O. helopioides , not reaching basal bulb. Female genitalia. Basal gonocoxite with ten or so lateroapical setae. Apical gonocoxite without dorsolateral ensiform setae, with nematiform setae ( Fig. 17E View FIGURE 17 ). Spermatheca coiled apically ( Fig. 17F View FIGURE 17 ).

Habitat. See “Habitat” under Pseudoodes vicarius .

Distribution. Palaearctic Region: Japan (Honshu), China ( Jiangsu, Jiangxi).

Notes. Describing the male protarsomeres, Habu & Baba (1960) stated that “ segment 3 is almost as long as segment 2, slightly narrower than this, with apex oblique ” (ibid.: 32) and “ with lateral sides parallel ” (ibid.: 33). We measured the lengths of male protarsomeres 2 and 3 in four Chinese specimens and two topotypical specimens. It was established that protarsomere 3 is about 1.15–1.25 times longer than protarsomere 2, and thus, the above indication by Habu & Baba is not correct. It should be noted also that specimens from China have smaller body size ( 12.8–14.9 mm, original data), while those from Japan have body length 14.0– 15.2 mm (data from Habu & Baba 1960 and original data).