Caligus ocyurus Cressey 1991

Caligus ocyurus

MATERIAL EXAMINED.—Five females and 1 male were collected from 3 specimens of the yellowtail snapper (Ocyurus chrysurus Bloch) from Carrie Bow Cay, Belize (holotype female, USNM 24014; allotype male, USNM 240145; paratypes, USNM 240146).

FEMALE.—Body form as in Figure 127. Total length 2.70 mm, greatest width 0.95 mm. Lateral margins of cephalothorax nearly parallel and cephalothorax somewhat longer than wide (1.39 × 0.95 mm). Genital complex longer than wide (1.09 × 0.77 mm). Abdomen (Figure 128) longer than wide (0.21 × 0.16 mm) (length of genital complex about 1.3 times longer than abdomen). Caudal ramus (Figure 128) longer than wide (0.12 × 0.07 mm).

Lunules widely separated. Second antenna (Figure 129a claw bent nearly at right angle in distal third with prominent sclerotized spine near base of claw; basal segment bearing prominent pointed spiniform posterior process. Postantennal process (Figure 129b) somewhat recurved, tip not sharply pointed, and outer margin membranous. Process of first maxilla (Figure 129c) distal third margins membranous and tip not sharply pointed. Sternal furca (Figure 130) tines about as long as box, somewhat divergent and pointed.

Leg 1 (Figure 131) coxopod with a patch of fine spinules, a digitiform process (?), and medial, outer pinnate seta, as in figure; last exopod segment with 4 short, terminal setae, medial 2 with pinnules on outer margin and accessory process, 3 pinnate setae on medial margin; outer distal margins of setae more finely pinnate than basal and outer margins. Leg 2 (Figure 132) exopod first segment with sclerotized spine at outer distal corner bearing fringed membrane along outer edge; second segment with naked outer spine, about one-half length of spine on first segment; last segment with short, naked outer spine, and outer terminal fringed spine, terminal semipinnate seta, and 5 medial pinnate setae; all three segments of endopod with patches of setules as in figure, last segment with usual 6 pinnate setae. Leg 3 (Figure 133) exopod first segment with heavily sclerotized spine extending across three-fourths of second segment; last segment with 3 weak outer spines and 4 pinnate setae. Leg 4 (Figure 134) exopod 2-segmented; first segment with outer distal seta extending to base of seta at mid-margin of last segment; last segment with outer seta and three terminal setae, outermost about one-third length of terminalmost seta, mid-seta about two-thirds length of last seta; all three terminal setae with prominent pecten at bases.

MALE.—Body form as in Figure 135. Total length 3.50 mm, greatest width 2.14 mm. Genital complex longer than wide (63 × 58 mm). First abdominal segment much wider than long (0.11 × 0.28 mm); second segment slightly wider than long (0.26 × 0.28 mm). Caudal rami longer than wide (0.21 × 0.14 mm). Second antenna (Figure 136) claw bifid; corpus with adhesion pads as in figure.

ETYMOLOGY.—The specific epithet refers to the host Ocyurus chrysurus.