Ochlesidae Stebbing, 1910

Ariyama, Hiroyuki, 2024, Curidia japonica sp. nov., the First Species of the Family Ochlesidae from the Northwest Pacific (Crustacea: Amphipoda), Species Diversity 29 (2), pp. 199-207 : 199-200

Family Ochlesidae Stebbing, 1910

[New Japanese name: Ōgi-yokoebi-ka]

Ochlesidae Stebbing, 1910: 581 ; J. L. Barnard 1969: 371; Coleman and J. L. Barnard 1991a: 259; Coleman and J. L. Barnard 1991b: 269; Berge et al. 1999: 242 (in part); Lowry and Stoddart 2003: 198; Coleman and Lowry 2006: 1 (Electronic Supplement 4); Coleman 2007: 126 (in part); Labay 2010: 35 (in part); Lowry and Myers 2017: 55.

Ochlesinae: J. L. Barnard and Karaman 1987: 856; J. L. Barnard and Karaman 1991: 401.

Type genus. Ochlesis Stebbing, 1910 .

Diagnosis. Body compressed laterally. Head short, tall, partially enveloped by pereonite 1; rostrum well developed. Pereonites raised into thin keels or formed into dorsal plaques. Urosomites free. Antennae poorly developed, short; accessory flagellum absent, both flagella reduced, with ≤ 5 articles. Mouthparts grouped conically. Upper lip narrow, tip not incised. Mandibles with lacinia mobilis in left, accessory blades absent, molar small; palp 3-articulated, article 1 elongate. Lower lip without inner lobes, outer lobes thin. Maxilla 1 with small inner plate; outer plate subconi-

© 2024 The Japanese Society of Systematic Zoology.

This is an open access article distributed under a Creative Commons Attribution 4.0 License (CC BY, https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and cal, with mostly-fused robust setae; palp tiny, 1-articulated. Maxilla 2 elongate. Maxilliped with very thin plates, palp absent or 1–2-articulated. Coxae 1–3 narrow, coxae 1 and 4 shorter than coxae 2–3. Gnathopods feeble, simple; gnathopod 1 ischium, carpus and propodus elongate, dactylus very short, usually with several feather setae; gnathopod 2 carpus and propodus elongate, merus and carpus produced posterodistally, dactylus very short, usually with robust seta. Pereopods 3–7 stout, bases of pereopods 5–7 expanded posteriorly or posterodistally. Uropod 1 biramous, outer ramus subequal to or slightly shorter than inner ramus; uropod 2 biramous, outer ramus shorter than inner ramus; uropod 3 biramous or uniramous, in biramous uropod 3, outer ramus usually shorter than inner ramus. Telson entire, tip acute or rounded.

Remarks. On the shape of the gnathopod 2, J. L. Barnard and Karaman (1991) stated “... simple, otherwise ... carpo- or merochelate.” However, it should be unified to “simple”, because the shape is quite different from the true “carpochelate” (ex. Grandidierella Coutière, 1904 ) and “merochelate” (ex. Aora KrØyer, 1845 and Aoroides Walker, 1898 ) (see Ariyama and Kohtsuka 2022).