Periclimenes crinoidalis Chace, 1969

(Figs. 51–52, video 11)

Periclimenes crinoidalis Chace, 1969: 251 (Curaçao); Chace 1972: 35 (Curaçao).

Not Periclimenes crinoidalis — Horká et al. 2016: supplementary table 1 (Curaçao), is P. bowmani Chace, 1972 .

Material examined. Curaçao: RMNH. CRUS.D.28336: 1 male, pocl. 1.6 mm, R =6/1, 1 ovigerous female, pocl. 24.5 mm, R =1+8/4; Piscaderabaai, 8.v.1962, between arms of Nemaster grandis A.H. Clark, 1909, collected by I. Kristensen. Bonaire: RMNH. CRUS.D.57892: many specimens, pocl. 1.0– 2.4 mm; stn BON.26, Small Wall, 12°10.685′N 068°17.539′W, 3.xi.2019, depth 42 m, scuba diving, on N. grandis, collected by C.H.J.M. Fransen (video 11) .

Remarks. The morphological characters of the present specimens agree well with the original description by Chace (1969). Rostrum (Fig. 50A, B, D, E) straight, slightly directed downward, reaching distal margin of distal segment of antennular peduncle; dorsal lamina not developed, with 3–8 dorsal teeth (number increases with size) at equal distances, proximal tooth at level of orbit; ventral lamina slightly concave with 0–4 small teeth (number incrases with size) distally. Hepatic tooth (Fig. 50A) slightly below level of antennular tooth, directed forward. Third abdominal segment (Fig. 50C) posteriorly produced. Telson (Fig. 50F) with 2 pairs of small dorsal spines at about 0.6 and 0.8 of telson length; lateral distal pair of same size as dorsal spines; posterior margin of telson (Fig. 50G) with small triangular process; this process was not figured nor mentioned by Chace (1969). Basal segment of antennular peduncle (Fig. 50B) with distolateral tooth and additional 2–3 teeth on anterior margin. Maxilla with endite bilobed. Ischiomerus of third maxilliped without distomedial mobile spine. Second pereiopods (Fig. 51A, B) dissimilar and unequal; fingers of major chela (Fig. 51B, C) curved, with pair of low teeth in proximal part of cutting edge each (Fig. 51D, E); movable finger with distinct dorsal carina (Fig. 51B–E), fixed finger as broad as movable finger, ventral surface glabrous. Ambulatory pereiopods with propodus (Fig. 51F) straight, with one subdistal ventral distally serrate spine (Fig. 51G, H) and two distoventral distally serrate spines. Dactylus of third pereiopod (Fig. 51G, H) with almost straight entire flexor margin; accessory tooth small or absent; unguis slender, about half length of corpus.

Colour (video 11). Translucent with black and white markings, matching the colouration of the host.

Ecology. The species was found in association with the crinoid Nemaster grandis A.H. Clark, 1909 by Chace (1969), Criales (1984), and Vera-Caripe et al. (2019).

Distribution. Known from few localities in the tropical western Atlantic: Curaçao (Chace 1969, 1972), Santa Marta, Columbia (Criales 1984), Martinique (Poupin 2018), Venezuela (Vera-Caripe et al. 2019) in depths between 15 and 38 m. Previous records from Curaçao by Chace (1969, 1972). Herein recorded for the first time from Bonaire at a depth of 42 m.