Pachylopus ripae Lewis, 1885: 469 [Enoshima and Hakodate, in Japan].
Eopachylopus ripae: Reichardt, 1926b: 14.
Eopachylopus ripae ab. tsherskii Reichardt, 1914: 328.
Neopachylopus ripae f. rufofasciatus Ôsawa, 1952: 4.
Eopachylopus ripae: Ohara, 1994, 264.; ESK & KSAE, 1994, 136 [Korea].
Japanese name: Tsuya-hamabe-emma-mushi.
Redescription. (Ohara, 1994)
Body length, PPL, 2.09 - 3.34 mm (2.61 ± 0.06, n=20), PEL, 1.96 - 2.91 mm (2.40 ± 0.05, n=20). Width, 1.64 - 2.49 mm (1.98 ± 0.04, n=20). Biometric data are given in Table 53. Body oval and strongly convex. Cuticles shining and black wholly or with a red spot on each elytron, rest of body black; antennae dark rufopiceous with club rufotestaceous; legs dark reddish brown.
Frontal stria of head (Fig. 154C) lightly carinate anteriorly and absent laterally. Disk smooth, sparsely clothed with microscopic punctures. Epistoma smooth.
Pronotal sides (Fig. 154A) nearly straight and weakly convergent on basal five-sixths, thence strongly arcuate and convergent to apices. Apical angles round. Marginal stria complete and feebly carinate basally. Disk smooth and impunctate.
Marginal epipleural stria weakly carinate and complete. Marginal elytral stria strongly carinate and complete, its apical end extending across elytral apex and united with apical end of sutural stria. Surface of epipleura between marginal epipleural and elytral striae smooth and shining on basal half; on apical half sparsely with shallow and transverse impressions. Subhumeral stria absent. Oblique humeral stria sharply impressed on basal half. First, 2nd and 3rd dorsal striae well impressed, beginning from basal sixth; 1st shortly present, ending at basal two-sixths; 2nd ending at basal half; 3rd ending at basal four-sixths. Fourth dorsal stria confined to basal region, usually represented by an arch. Sutural stria deeply impressed, nearly complete, beginning at basal fifth and its apical end united with end of marginal elytral stria. Surface of elytra smooth, sparsely with microscopic punctures.
Propygidium sparsely covered with fine punctures, which are coarser and denser laterally. Interspace among punctures with lightly impressed, fine and irregularly transverse alutaceous microsculpture, which are heavily impressed on basal half. Pygidium sparsely clothed with microscopic punctures, and shining. Interspace among punctures with more lightly impressed, irregularly transverse microsculptures than on propygidium.
Anterior margin of median portion of prosternum (Fig. 154E) obtuse-angulate. Preapical fovea weakly impressed on lateral side of keel at apical sixth. Keel strongly compressed, without even disk except on basal third. Carinal striae of keel distinctly and shortly impressed between precoxae, convergent anteriorly and united with each other at apex. Descending lateral striae shortly present and convergent apically, their apical ends attaining at middle of keel.
Anterior margin of mesosternum strongly emarginate medially, its marginal stria well impressed, complete and carinate. Disk smooth, sparsely with microscopic punctures. Meso-metasternal suture sparsely and coarsely crenate. Intercoxal disk of metasternum smooth, sparsely clothed with microscopic punctures; feebly depressed on anteromedian area, and strongly depressed on nearly apical half along longitudinal suture. Lateral metasternal stria well impressed and carinate, extending obliquely and posteriorly, reaching near hind coxae. Lateral disk densely covered with large, shallow and setiferous punctures. Interspace among punctures with fine, irregular and transverse alutaceous microsculptures. Posterior mesocoxal stria well impressed, carinate, and extending along posterior margin of mesocoxal cavity. Disk of metepisternum densely covered with large punctures.
Intercoxal disk of 1st abdominal sternum broadly depressed mediobasally and sparsely covered with moderate punctures before posterior corner. Lateral stria of the disk complete, well impressed and carinate.
Protibia (Fig. 155A, B, C) with 10 spines on outer margin, two spines on apical corner and another spine behind the two being clavate. Ventral sides of meso- and metatibiae with many stout spines.
Male genitalia as shown in Fig. 156.
Table 53. Biometeric data of Eopachylopus ripae (Lewis).
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APW 0.72-1.11 (0.88±0.02) 20
PPW 1.50-1.99 (1.81±0.03) 20
PL 0.72-1.05 (0.85±0.02) 20
EL 1.18-1.83 (1.52±0.04) 20
EW 1.64-2.49 (1.98±0.04) 20
ProW 0.95-1.47 (1.14±0.03) 20
ProL 0.20-0.39 (0.25±0.01) 20
PyL 0.86-1.48 (1.17±0.04) 20
PTL 0.59-0.92 (0.75±0.02) 20
MSTL 0.52-0.92 (0.72±0.02) 20
MTTL 0.65-1.08 (0.85±0.02) 20
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Eopachylopus ripae is easily recognized by the the characters given in the key and description; it is hardly confused with any other species of the tribe.
The speceis occurs under dacaing bodies of fish on sandy beach.
Specimens examined. (Ohara, 1994)
[Hokkaidô] 2 exs., Muroran, 25/vi/1960, T. Yamashita leg.
[Honshû] <Fukushima-ken> 1 ex., Fujima-kaigan, Iwaki, 25/vi/1988, K. Tazoe leg. <Chiba-ken> 7 exs., Ôami, 19/vi/1984, 1/v/1990, M. Ôhara leg. <Aichi-ken> 1 ex., Miya, Mikawa, 1-2/ix/1947, S. Ôsawa leg. (NA). <Mie-ken> 5 exs., Akogi-ga-ura, Mie Coast, 30/vi/1957, M. Gotô leg. (NA and NSMT).; 1 ex., Tsu-kaigan, 30/v/1957, Z. Naruse leg. (NSMT). <Wakayama-ken> 32 exs., Nachi, southern Kii, 26/iv/1947, S. Ôsawa leg. (NA); 2 exs., Ditto, 19/vii/1946, S. Ôsawa leg. (NA); 14 exs., Ditto, 29/iv/1947, S. Ôsawa leg. (NA). <Ishikawa-ken> 7 exs., Uchinada-sakyû, 31/viii/1968, H. Ebihara leg.
[Kyûshû] <Fukuoka-ken> 1 ex., Satsuki-matsubara, 8/v/1983, S. Nakao leg. (NA); 1 ex., Ainoshima, 22/v/1983, S. Nakao leg. (NA).
[Nansei Isles.] <Tane-ga-shima Is.> 2 exs., Hamada, 31/vii/1984, Y. Harada leg.
[Honshu] Chiba-ken: Oami (4 exs., 23/v/1994), M. Ohara; Ichinomiya sea side, Ichinomiya-machi (4 exs., 28/v/1973, CBM-Z-53967-70), H. Yamazaki; River mouth of Kuriyama river (2 exs., 16/vi/1974, CBM-Z-53973, 4), H. Yamazaki; Kidohama, Hikari machi (3 exs., 21/ix/1986, CBM-Z-61422-4), T. Itoh. Kanagawa-ken: Shichiri-ga-hama, Kamakura (1 ex., 24/viii/1989), K. Kawada. Aichi-ken: Hosoya, Omotehama, Toyohashi (2 exs., 21/v; 2 exs., 11/vi; 2 exs., 24/vi/1990), M. Hasegawa (Hasegawa & Kanie, 1992). Ishikawa-ken: Kanaiwa, Kanazawa (2 exs., 27/vii/1991), K. Nakata.
