Pseudoeucanthus uniseriatus Wilson C. B. 1913

Pseudoeucanthus uniseriatus Wilson

Pseudoeucanthus uniseriatus Wilson, 1913:203.

MATERIAL EXAMINED.—Holotype (USNM 43510) from the mouth of Caranx crysos (Mitchell) from Jamaica, 11 from gill washings of 38 Haemulon sciurus (Shaw) from Carrie Bow Cay, Belize, collected by the author 7 Mar 1980 and 9 Dec 1980, and 2 from 11 Chaetodon humeralis Günther (USNM 80878–80888) from Panama market, collected by the author 17 May 1983.

FEMALE.—Body form as in Figure 105. Total length 0.9 mm, greatest width 0.33 mm (measured at widest part of cephalon). Cephalon length 0.26 mm. Rostral hooks present. Thoracic segments bearing legs 2–4 distinct, segments bearing legs 3 and 4 longer than wide, segment bearing leg 5 indistinctly articulated with genital segment. Genital segment (Figure 106) wider than long separated from abdominal segment (124 × 71 μm). Abdomen 3-segmented (Figure 106), segments measure (length × width) 44 × 61 μm, 30 × 53 μm, and 24 × 42 μm, respectively; spinules present on ventral surface of all abdominal segments. Spinules on first 2 segments more closely spaced than those on last segment. Caudal rami (Figure 107) about twice as long as wide (41 × 20 μm), with a patch of spinules on ventrodistal surface; each ramus with a lateral seta, an outer subterminal seta, and 4 terminal setae (1 major seta much longer [59 μm] than others), all setae naked.

First antenna (Figure 108) 5-segmented, 15 weakly sclerotized plumose setae on anterior edge of first 2 segments, an aesthete on each of last 2 segments. Second antenna (Figure 109) third segment with irregular rows of stout hooklets; last segment with 4 terminal articulated spines and 2 inner setae. Labrum covered with scale-like spinules. Oral area (Figure 110) typically bomolochid except first maxilla with only 2 long, plumose setae (usually 3, sometimes 4, in other bomolochids). Second maxilla, second segment, with outer proximal corner produced. Maxilliped (Figure 111) claw somewhat recurved and without an accessory process.

Legs 1–4 biramose. First leg (Figure 112) basipod with 2 large patches of spinules; exopod 2-segmented, first segment with a small spine on outer distal corner, second segment with 6 plumose seta and 4 short spines; endopod 3-segmented, first segment with an inner plumose seta, second segment with an inner plumose seta and a row of spinules along outer half of distal margin, last segment with an inner plumose seta, Leg 2 (Figure 113) basipod with 2 patches of small spinules, a patch of stout spinules near origin of endopod, and a seta near outer distal corner, exopod first and second segments indistinctly separated and each with a large patch of spinules and a naked weak spine on outer distal corner, last segment with 2 patches of spinules, 3 naked weak spines on outer edge and 3 setae with short plumosities; endopod first segment with a row of spinules along distal margin and an inner plumose seta, second segment like first except with 2 inner setae. Leg 3 (Figure 114) basipod with a patch of small spinules, a patch of scale-like spinules, and a seta near outer distal corner; exopod as in leg 2; endopod first and second segments each with a patch of stout spinules and an inner seta, last segment with 2 short outer spines and 2 setae (all endopod setae with short plumosities). Leg 4 (Figure 115) exopod as in legs 2 and 3; endopod as in leg 3 except last segment with a short outer spine, a terminal seta and a short inner naked seta. Leg 5 (Figure 116) with patches of spinules as in the figure, a weak lateral subterminal seta and 3 terminal setae, middle seta longest. Leg 6 represented by 3 setae at area of egg sac (Figure 106).

MALE.—Unknown.