Pumiliopsis sardinellae (Bennet 1964)

Pumiliopsis emarginatus

MATERIAL EXAMINED.—One collection containing 10 females and 4 males (holotype USNM 143622, allotype male USNM 143623, paratypes 9 females, 3 males USNM 143624) from the eyes of 18 Sardinella perforata (USNM 190241) from Manila, Philippines (Albatross collection).

FEMALE.—Body form as in Figure 39. Total length 3.24 mm and greatest width 1.18 mm (measured at widest part of cephalon). Cephalon more or less rounded. Rostrum (Figure 40) conical with small ventral sensilla on each side of bifurcate tip and 2 dorsal hooks near base. Length of rostrum 236μ, width at base 224μ. Genital segment (Figure 41) almost twice as wide as long (324μ × 531μ), length measured from anterior edge to end of posterolateral sclerotization. Abdomen apparently 2-segmented; first segment relatively long (401μ) without ornamentation, tapering gradually; second segment short (65μ) with 4–5 uneven longitudinal rows of scalelike spinules and row of fine spinules around posterolateral edge. Caudal rami (Figure 42) longer than wide (77μ × 59μ); each ramus with 2–3 uneven longitudinal rows of scalelike spinules and 6 setae (longest seta 159μ).

First antenna (Figure 43) 5-segmented, second segment incompletely divided. Basal 2 segments measure 325μ, remaining 3 measure 74μ, 33μ, and 71μ long respectively; no aesthetes visible. Second antenna (Figure 44) with several rows of small, closely placed spinules on third segment, 4 hooked spines and 2 setae distally. Labrum with 2 patches of scalelike spines as in Figure 45. Mandible, paragnath, first and second maxilla as in Figure 45. First maxilla with 3 setae, innermost sparsely plumose, outer 2 naked, middle seta very long (325μ). Labium represented by a single row of short spines posterior to mouth. Maxilliped (Figure 46) hook strong, nearly straight without acessory process.

Legs 1–4 biramous, rami 2-segmented except endopod of leg 4. Leg 1 (Figure 47) coxopod with broad inner seta, and outer plumose seta visible under exopod; basipod with 2 patches of scalelike spinules; exopod first segment with outer spine, second segment with 3 outer spines and 6 plumose setae; endopod first segment with outer patch of scalelike spinules and inner seta, second segment with 6 setae. Leg 2 (Figure 48) basipod with 2–3 rows of scalelike spinules ventrally and short dorsal seta; exopod first segment with 2 distinct patches of scalelike spinules on outer edge, one spine on outer distal corner and patch of stout spinules at distal margin, second segment with 3 naked outer spines, terminal spine armed with stout spinules and 3 terminal setae, outer edge of segment armed with 3 patches of stout spinules; endopod first segment with short inner seta, second segment with 5 inner to terminal setae and 2 short outer setae, outer margin of segment fringed with 2 patches of short hairs. Leg 3 (Figure 49) basipod with short dorsal seta, exopod and first segment of endopod as in leg 2; endopod second segment with short inner seta and 4 terminal setae (outermost 2 short). Leg 4 (Figure 50) basipod, exopod and first segment of endopod as in leg 3; endopod second segment with inner seta, third segment with 3 terminal setae (middle one longest). Leg 5 (Figure 51) basal segment with one dorsal seta, last segment without surface ornamentation, truncate distally and bearing 4 setae (one outer and 3 terminal). Leg 6 represented by 3 short, stout setae on lateral margin of genital segment (see Figure 41).

Egg sacs flattened and containing approximately 250 eggs.

MALE.—Body form as in Figure 52. Total length 0.97 mm, greatest width 0.38 mm measured at widest part of cephalon. Cephalon slightly wider than long with slightly protruding, rounded rostrum (not produced as in female). Genital segment slightly longer than wide (218μ × 207μ), outer distal corners produced. Abdomen (Figure 53) 2-segmented: first segment (57μ long) with transverse patch of fine spinules; second segment (59μ long) with one transverse and 2 nearly longitudinal rows of scalelike spinules (spinules in transverse row elongate). Caudal rami (Figure 53) longer than wide (41μ × 30μ), each ramus with patch of scalelike spinules and 6 setae (longest seta 590μ, more than half total body length).

First antenna (Figure 54) 5-segmented, with most setae finely plumose and aesthetes on fourth and fifth segments; segments measure 59μ, 100μ, 35μ, 23μ, and 38μ long respectively. Second antenna (Figure 55) with spinelike process on second segment, third segment with several rows of spinules, 4 hooked spines and 2 setae, and long pectinate spine. Mouthparts as in Figure 56. Labrum with scalelike spinules similar to female. Maxilliped (Figure 57) base with one seta; second segment stout with outer row of long hairs, proximal triangular process, 2–3 rows of strong, teethlike spines and 2 setae on inner edge; third segment in form of 2-segmented claw, second segment with one seta and finely toothed at tip.

Legs 1–4 biramous, each ramus 3-segmented except leg 4 endopod. Leg 1 (Figure 59) coxopod with inner plumose seta and row of long spinules on outer distal corner; basipod with 2 patches of broad scalelike spinules, blunt spine on inner edge, and dorsal seta near outer distal corner; exopod first segment with fine spinules on outer edge, outer pectinate spine and 2–3 heavy spinules on outer distal corner, second segment with inner plumose seta, outer spine and slender spinules on outer edge, third segment with 3 outer spines and 4 terminal to inner setae, outer edge with slender spinules; endopod first and second segments each with transverse row of elongate scalelike spinules and inner seta, third segment with 5 setae. Leg 2 (Figure 59) coxopod with short spinules on outer distal corner; basipod with row of slender spinules on inner distal edge and row of spatulate, scalelike spinules on outer distal edge between insertion of endopod and exopod; exopod first segment with outer row of scalelike spinules, one outer spine and few stout spinules on outer distal corner, second segment with inner plumose seta, outer spine and small spinules on outer edge, third segment with 3 outer spines (last 2 with teethlike outer spinules), 5 terminal to inner setae, outer edge of segment with 2 patches of spinules; endopod first segment with row of slender spinules and inner seta, second segment with row of spinules and 2 inner setae, third segment with 2 short terminal spines and 2 inner setae. Leg 3 (Figure 60) basipod with uneven row of blunt spinules on inner distal corner, exopod and endopod similar to leg 2 except outer edge of exopod second segment without ornamentation. Leg 4 (Figure 61) basipod as in leg 3; exopod similar to leg 3 except last segment with 4 plumose setae; endopod 2-segmented, first segment with row of scalelike spinules and inner plumose seta, second segment elongate with 3 terminal setae (middle longest) and distal row of slender spinules. Leg 5 (Figure 62) basal segment with long, finely plumose dorsal seta, last segment with row of fine spinules on inner distal edge, inner distal bipectinate spine and outer distal plumose seta.

ETYMOLOGY.—The specific name emarginatus is Latin for “notched at the apex,” referring to the shape of the rostrum in the female.