Eusarsiella pilipollicis (Darby 1965)

Eusarsiella pilipollicis (Darby, 1965)

Sarsiella pilipollicis Darby, 1965:35, pl. 23: figs. 2–9.

HOLOTYPE.—UMMP 48806, female, length 1.37 mm.

TYPE-LOCALITY.—Offshore of Sapelo Island, Georgia, water depth 114 m.

MATERIAL.—See “Station Data with Specimens Examined.”

DISTRIBUTION.—Continental shelves off North Carolina, Georgia, Florida, Louisiana, and Texas (Figure 3). Known depth range 40–114 m (Table 1).

SUPPLEMENTARY DESCRIPTION OF ADULT FEMALE (Figures 60, 61, Plate 13).—Carapace oval in lateral view with elongate caudal process and no rostrum (Figure 60); surface with 2 horizontal midribs weakly connected at their posterior ends, and 1 short horizontal anteroventral rib; upper and lower midribs with 8 spinous processes in addition to long spinous terminal process at posterior end; anteroventral rib with 4 spinous processes; 2 spinous processes present between anterior ends of midribs; 21–22 spinous processes present near edge of valve; 1 small spinous process present near middle of caudal process.

Ornamentation (Figures 60, 61a; Plate 13): Surface with distinct fossae; margins of fossae and area between fossae with minute slender hairs; slightly longer hairs present on ribs and processes, in vicinity of valve margins, and on caudal process (these hairs taper to point, except some of the longer hairs on processes may have minute swellings at tip); long hairs with swelling near middle scattered over valve surface and along edges (Figure 61a); transparent substance between short bristles visible on horizontal ribs and along valve margin.

Infold: Anterior infold with minute bristle near valve middle (Figure 61a); infold of caudal process with 4 bristles forming proximal row; posterior with 2 setose bristles (Figure 61b).

Selvage: Wide lamellar prolongation present around anterior, ventral, and posterior margins (Figure 61b).

Size: USNM 152865, length including processes 1.44 mm, length excluding processes 1.39 mm, height including caudal process 1.44 mm; height excluding caudal process 1.16 mm. USNM 156785, length including processes 1.22 mm, length excluding processes 1.17 mm, height including caudal process 1.18 mm, height excluding caudal process 0.99 mm.

First Antenna (Figure 61c): First joint bare; second joint with 1 spinous dorsal bristle and few faint spines along dorsal margin; third and fourth joints fused; third joint short with 1 long spinous dorsal bristle and 1 short bare ventral bristle; fourth joint with 1 short spinous dorsal bristle and 2 long bare ventral bristles; sensory bristle of fifth joint with 2 minute filaments on middle part and 1 near tip; medial bristle of sixth joint short. Seventh joint: a-bristle about twice length of bristle of sixth joint, with marginal spines; b-bristle slender, bare, about 1 times the length of a-bristle; c-bristle about same length as sensory bristle of fifth joint, with 2 minute filaments on middle part and 1 near tip. Eighth joint: d- and e-bristles bare with blunt tips, slightly shorter than c-bristle; f- and g-bristles about same length as c-bristle, with 2 minute filaments on middle part and 1 near tip.

Second Antenna (Figure 61d): Protopodite bare; endopodite 1-jointed with 1 or 2 short anterior bristles. Exopodite: first joint with short terminal, medial spine; dorsal margin of bristle of second joint with natatory hairs; ventral margin with 1 natatory hair followed by 7–14 spines and then natatory hairs; bristles of joints 3–8 with natatory hairs; ninth joint with 2 bristles, 1 long with natatory hairs, 1 short bare; lateral terminal margin of joints 3–7 with short spines forming row.

Mandible (Figure 61e): Coxale endite consisting of sharp spine; ventral margin of coxale with long hairs. Basale: medial surface with proximal bristle near ventral margin and 1 minute distal bristle; ventral margin with 2 proximal bristles, 1 much longer than other; lateral surface with 2 small distal bristles near ventral margin; dorsal margin with 2 minute subterminal spines. Exopodite absent. Endopodite: first joint with medial surface with distal spines and 1 minute bristle near base of main claw; dorsal margin with terminal spines; second joint with short dorsal bristle and main ventral claw; third joint with short ventral bristle and minute dorsal bristle at base of main claw (tip of main claw on illustrated limb broken).

Maxilla (Figure 61f,g): Coxale with short anterior bristle and hirsute epipodial appendage. Endite I with 7 bristles; endite II with 4 bristles; endite III with 5 bristles. Basale with short bristle near exopodite. Exopodite with 2 bristles, inner bristle about length of outer bristle. Exopodite: first joint with alpha- and beta-bristles with proximal marginal teeth and distal marginal spines; second joint with 2 lateral a-bristles, 1 medial c-bristle, and 5 stout pectinate terminal bristles.

Fifth Limb (Figure 61h): Epipodial appendage with about 30 bristles; single endite present with 1 short bristle. Exopodite: first joint with 2 spinous bristles; second to fifth joints fused; second joint with 3 spinous bristles; third to fifth joints with total of 6 bristles; exopodite hirsute.

Sixth Limb (Figure 61i): Endite I with 3 short bristles; end joint with 12 or 13 slender bristles either bare or with short spines followed by 2 stout hirsute posterior bristles; posterior part of limb hirsute.

Seventh Limb (Figure 61j): Each limb with 8 bristles, 2 proximal, 1 on each side, and 6 terminal, 3 on each side; each bristle with 3–6 bells and no distal marginal spines; terminus with opposing combs, each with about 5 teeth.

Furca (Figure 61k): Each lamella with 5 or 6 claws followed by several small spines (USNM 152865 with 5 claws on right lamella and 6 on left); claw 1 continuous with lamella, others separated from lamella by suture; claw 1 with posterior marginal teeth forming 8 groups, each with 5–8 teeth increasing in length distally; claws 2–4 with long and short teeth along posterior margin; claw 4 with few teeth along anterior margin; claws 5 and 6 bare or with few teeth along posterior margin; anterior of lamella with slender spines and hairs; long medial hairs present at base of claws and following claws.

Bellonci Organ (Figure 61l): One-jointed, elongate with rounded tip.

Eyes (Figure 61l,m): Lateral eye small with 4 or 5 ommatidia; medial eye bare, larger than lateral eye.

Upper Lip: Not observed.

Anterior of Body: Triangular process present between medial eye and upper lip.

Genitalia: Oval sclerotized rim.

Y-Sclerite (Figure 61n): Normal for family.

Eggs: USNM 152865 with 7 eggs in marsupium and additional smaller unextruded eggs; USNM 156785 with 9 eggs in marsupium.