Ischyrocerini Krøyer, 1838

Just, Jean, 2017, A fresh look at the higher classification of the Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 12: with a key to all taxa, Zootaxa 4320 (2), pp. 321-338 : 325

Ischyrocerini Krøyer, 1838 (by Myers & Lowry, 2003) *

Type genus. Ischyrocerus Krøyer, 1838

Diagnosis (modified from Myers & Lowry, 2003: 472). Antennae slender, antenna 1 with accessory flagellum (occasionally vestigial). Mandible palp with 3 articles, ( Fig. 2 A2 ). Gnathopods with propodus longer than carpus, longer in gnathopod 2 than 1, propodus oval to weakly subchelate, except gnathopod 2 propodus in adult male strongly enlarged, of varying shape. Coxae 1–4 generally as long as broad (plate 2 occasionally of different shape), margins entire. Pereopods 5–7 slender, of similar form, carpus elongate, increasing in length backwards, dactyli forward curved. Urosomites 1–3 free. Uropods 1 and 2 peduncle without distoventral corona, with 2 subequal rami. Uropod 3 peduncle long, broad proximally, narrow distally, biramous. Telson entire, with a few simple or robust setae dorsally.

Component genera. Altajassa Conlan, 2007; Bathyphotis Stephensen, 1944 ; Coxischyrocerus Just, 2009 ; Isaeopsis K.H. Barnard, 1916 ; Ischyrocerus Krøyer 1838 ; Jassa Leach, 1814 ; Microjassa Stebbing, 1899 ; Myersius SouZa-Filho & Serejo, 2014 ; Neoischyrocerus Conlan, 1995 ; Paradryope Stebbing, 1888 ; Parajassa Stebbing, 1899 ; Pseudischyrocerus Schellenberg, 1931 ; Ruffojassa Vader & Myers, 1996 ; Scutischyrocerus Myers, 1995 ; Tropicischyrocerus Just, 2009; Ventrojassa J.L. Barnard, 1970; Veronajassa Vader & Myers, 1996 .

* Not considered further.

Figures

FIGURE 2. A, Ericthonini; B, Cerapodini; C, Siphonoecetini. 1, antennae; 2, mandibles; 3, gnathopod 1; 4, gnathopod 2 (c 1 simple and c 2 subchelate forms); 5 a, pereopods 5 – 7; 5 b, pereonite 5 with coxa; 6, telson with uropod 3. (A 2 from Lowry & Berents 1996; A 6 from Lowry & Berents 2005; B 2 from Krapp-Schickel 2013.)