NO. 3656 COPEPODS—LEWIS 31 
Family CALIGIDAE 
Pseudanuretes pomacanthi, new species 
Fiaures 14, 15 
Mareriau.—1 female (holotype, USNM 120749) from the gill 
cavity of Pomacanthus imperator (Bloch). 
MEASUREMENTS (in mm).—1 female: 
Total length, excluding caudal setae 0.97 
Length of cephalothorax 0.74 
Width of cephalothorax 0.61 
Length of fused genital segment and abdomen 0.23 
Width of genital segment 0.31 
Length of egg strings (strings broken) 
Description.—Cephalothorax (fig. 14a) consisting of cephalon and 
first 4 thoracic segments, anterior end bluntly pointed. Frontal 
region narrow, forming approximately one-sixteenth the length of 
cephalothorax, partially covered by adjacent portion of cephalothorax; 
with narrow membrane projecting from anterior ventral surface. 
Lateral surfaces of cephalothorax flatly convex, with fine, ventrally 
projecting membrane. Posterior lateral regions forming narrow, 
slightly projecting lobe, posterior sinus minute, without membrane. 
Posterior median cephalothoracic region broad, forming 90 percent 
of posterior surface, covering indistinct free fourth pedigerous segment 
and anterior end of genital segment. Major dorsal cephalothoracic 
grooves extending anteriorly from junction of posterior lateral and 
posterior median cephalothoracic regions, terminating on lateral 
surface in anterior third of cephalothorax; transverse groove absent. 
Ocular region distinct, situated well anterior to termination of dorsal 
grooves. 
Free fourth pedigerous segment appearing as narrow annulus, 
indistinctly separable from cephalothorax but distinct from genital 
segment. Genital segment (fig. 146) broad, lateral surfaces convex, 
posterior surface knobby, depressed medially. Fifth legs (fig. 15f) 
situated on posterior lateral surface, consisting of 4 plumose setules, 
1 slightly anterior to other 3. Abdomen fused with genital segment, 
situated in posterior depression of segment. Anal opening distinct, 
between small caudal rami. Caudal rami (fig. 14c) short, bearing 4 
plumose terminal setae. 
Antennule (fig. 14d) 2-segmented, attached to cephalothorax im- 
mediately lateral to frontal region; segments flaccid, poorly sclerotized. 
First segment approximately one and one-half times the length of 
second, margins irregular, anterior ventral surface bearing approxi- 
mately 13 naked or lightly plumose setae, distal ventral surface bearing 
