Caribboecetina, Just, Jean, 2017

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 : 328

Caribboecetina subtribe nov.

Type genus. Caribboecetes Just, 1983

Diagnosis. Siphonoecetini with or without rostrum; antenna 2 flagellum with 2 robust setae on article 3, 1 distal robust seta on article 2, none on article 1 ( Fig. 3 Ea); gnathopod 2 propodus oval to nearly simple with row of robust setae along posterior margin ( Fig. 2 C 4 c 1 ) (modified subchelate in Concholestes ); coxal plates 3 and 4 with short, pectinate setae in indentations along anterior and distal margins ( Fig. 3 A 2 ); pereopods 5–6 carpus apex and lateral surface with a few to many equal siZed peg-like robust setae ( Fig. 3 B 2 ); unguis of pereopods 5–7 without accessory claw (except Polynesoecetes ) ( Fig. 3 B 2 ); uropod 1 inner ramus less than ½ length of outer ramus, flat (except elongate, cylindrical in Concholestes ) ( Fig. 3 C 4 ); uropod 2 absent; uropod 3 without ramus (except small, single ramus in Africoecetes armatus ); telson rounded triangular, fused with dorsally visible urosomite 3 ( Fig. 3 C 4 ).

Component genera. Africoecetes Just, 1983 ; Ambicholestes Just, 1998 ; Australolestes Just, 1998 stat. nov.; Caribboecetes Just, 1983 ; Concholestes Giles, 1888 ; Polynesoecetes Myers, 1989 .

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.