Orientoecetes Just, 1983

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 : 331-332

Orientoecetes Just, 1983 , stat. nov.

Siphonoecetes (Orientoecetes) Just, 1983: 124 .

Type species. Siphonoecetes orientalis Walker, 1904 .

Diagnosis. Bubocorophiina with rostrum. Flagellum of antenna 2 article 1 and 2 with several robust setae ventrally ( Fig. 3 Eb), article 3 with 2 distal robust setae. Pereopods 5–6 carpus with 1 long and 1 short robust setae ( Fig. 3 B 1 ). Uropod 1, peduncle in male with normal ventroapical corona margin. Inner ramus of uropods l and single ramus of uropod 2 with single large apical robust seta in hollowed apex. Uropod 3 peduncle with a few short setae on medial projection ( Fig. 4 G 2 ).

Component species. Orientoecetes arabicus ( Barnard & Thomas, 1984) comb. nov.; O. erythraeus ( Ruffo, 1959) ; O. orientalis (Walker, 1904) ; O. spinipalpus Just, 2004 .

Figures

FIGURE 1. A. The relationship among the proposed tribes in the subfamily Ischyrocerinae based on clades identified by Lowry & Berents (1996). B. Subtribes in tribe Siphonoecetini as established here. (Illustrated: A, Cephaloecetes schioettei Just, 2017, in abode; B, Rhinoecetes coclearis Just, 2012 a, abode aggregation).

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.)

FIGURE 3. A, coxal plate 2 (and 3); B, distal parts of pereopod 5 (and 6); C 1, Siphonoecetina urosome, C 2 and C 3, Bubocorophina urosomes, C 4, Caribboecetina urosome; D, sternal papillae on pereonite 7. E, antenna 2 flagellum, 1 – 3 articles 1 – 3; F, uropod 1, vv ventral view, lv lateral view, (refers to keys below).

FIGURE 4. A, lateral and dorsal views of heads of Rhinoecetes spp.; B, lateral view of head with pseudorostrum; C, complexly lobate lower lip; D, simple lower lip; E, pereopod 7; F, rami of uropod 1 of Rhinoecetes spp., G, uropod 3 with rounded ramus; H, natatory antenna 2 of Australoecetes sellicki.