Synasterope setisparsa (Kornicker 1958) Poulsen 1965

Synasterope setisparsa (Kornicker, 1958)

Asteropina setisparsa Kornicker, 1958:239, figs. 46, 9A–B, 62A–D, 63A–D, 64A–E, 86L–P.

Synasterope setisparsa.—Poulsen, 1965:396, 401, 402, 421, 431, 469 (map).

HOLOTYPE.—Ovigerous female, lost.

LECTOTYPE.—USNM 122901 (Kornicker, 1958:241, specimen number 127G), ovigerous female from Bimini area. Designated herein.

TYPE-LOCALITY.—Bimini area, Great Bahama Bank.

MATERIAL.—Lectotype. San Salvador, Bahamas: USNM 158336, 1 adult female; USNM 158384A, 158384B, 2 juvenile females; USNM 158384C, 1 juvenile; USNM 158402, 5 juveniles.

DISTRIBUTION.—Bimini and San Salvador, Bahamas, at depths of 1–5 m.

DIAGNOSIS.—Carapace: Posterior infold of left valve with straight list having posterior spines forming row.

First Antenna: Adult female without lateral bristle on 2nd joint. Sensory bristile of adult female with long stem and 6 terminal filaments.

Second Antenna: Protopodite without distal medial bristle.

Mandible: Coxale endite with small bristle near base of ventral branch; basale without midbristle on dorsal margin, and with longer of 2 terminal dorsal bristles reaching b- or c-bristle on dorsal margin of 2nd endopodial joint; lateral bristle between b- and c-bristles absent on adult female; medial bristle near base of d-bristle of 2nd endopodial joint fairly short.

Maxilla: Dorsal margin of basale with short distal bristle. Endite I with 2 long and 1 short bristles.

Fifth Limb: Lateral side of comb with 2 slender bristles just ventral to base of long, spinous, exopodial bristle.

Sixth Limb: Ventral and posteroventral margin of skirt with very few bristles (not more than 2 or 3). Anterior tip of skirt with 1 very long stout bristle and 1 or 2 small bristles.

Seventh Limb: With total of 12 bristles (6 proximal, 6 distal).

Lateral Eyes: Well developed and pigmented black.

Posterior of Body: With thumb-like dorsal process.

SUPPLEMENTARY DESCRIPTION OF ADULT FEMALE (Figures 29–31).—Carapace elongate with subparallel, slightly convex, dorsal and ventral margins in lateral view (Figures 29a, 31a). Black lateral eyes visible through valve (Figure 31a); deep narrow incisur present on anteroventral margin; posterior of valves evenly rounded.

Infold (Figure 31b–d): Rostral infold with numerous small bristles forming row parallel to anterodorsal margin of rostrum and many smaller bristles posterior to the outer row; additional small bristles present on anteroventral infold ventral to incisur. Wide posteroventral list with 20–25 faint flap-like bristles and few minute spines; posterior edge of posterior list linear, well defined on both valves, but with abundant spines only on left valve (Figure 31 c,d).

Size: USNM 122901, 1 lectotype, length of dry specimen 1.48 mm, height 0.77 mm [Kornicker, 1958:241, gave length of this specimen as 1.5 mm, and height as 0.78 mm]. USNM 158336, length 1.47 mm, height 0.74 mm. Kornicker (1958:241) gave dimensions of lost holotype as length 1.54 mm, height 0.75 mm, and an ovigerous female (Number 122D-3) as length 1.52 mm, height 0.77 mm.

First Antenna (Figures 29b, 30e): 1st joint with faint lateral spines forming rows, and longer medial spines. 2nd joint with lateral and medial spines and 1 spinous dorsal bristle; no lateral bristle present. 3rd and 4th joints quadrate; 3rd joint with minute ventral bristle and 6 spinous dorsal bristles; 4th joint with 1 spinous dorsal bristle, 2 slender ventral bristles, and concave distal margin. Sensory bristle of long 5th joint slender with 6 terminal filaments. Medial bristle of 6th joint long, spinous. 7th joint: a-claw stout, about combined length of joints 5–8; b-bristle stout, with 3 dorsal filaments near middle; c-bristle reaching past tip of sensory bristle of 5th joint, with 5 short marginal filaments. 8th joint: d-bristle absent; e-bristle bare with blunt tip not reaching tip of sensory bristle; f-bristle bent dorsally, with 3 spinous filaments near middle and bifurcate tip; g-bristle about same length as c-bristle, with 5 short filaments near middle of dorsal margin.

Second Antenna (Figures 29c,d, 31f): Protopodite with medial spines on dorsal half but without distomedial bristle. Endopodite 3-jointed; 3rd joint with long terminal bristle. Exopodite: bristle of 2nd joint reaching just past 9th joint, with ventral spines; bristles of joints 3–8 with ventral spines and natatory hairs; 9th joint with 3 bristles (1 long bristle with ventral spines and natatory hairs, 2 shorter bristles with short marginal hairs); joints 3–8 with basal spines becoming larger on distal joints; 9th joint with long lateral spine; joints 2–8 with short slender spines forming lateral row along distal margin.

Mandible (Figure 30a–c): Coxale endite (Figure 30c): Small medial bristle present near base of ventral branch of endite; ventral branch with spines forming 5 oblique rows, and pointed tip with about 5 minute spines; ventral margin of dorsal branch with stout double tooth followed by 3 smaller teeth and main spine; hirsute dorsal bristle present with base set back from tip of branch. Basale endite with 4 end bristles, 2 or 3 triaenid bristles with few (3 or 4 pairs) marginal teeth, and 1 dwarf bristle. Basale: ventral margin near base of endite with 1 triaenid bristle with 3 or 4 pairs of distal teeth excluding terminal pair, and U-shaped depression; dorsal margin with 2 subterminal bristles (longer of these reaching base of b- or c-bristle of 2nd endopodial joint; length of shorter bristle slightly less than half that of dorsal bristle); lateral surface with few spines forming rows near dorsal margin. Exopodite reaching slightly past middle of dorsal margin of 1st endopodial joint, hirsute distally, with 2 short subterminal bristles. 1st endopodial joint with 3 long, spinous, ventral bristles. 2nd endopodial joint: dorsal margin with 1 small proximal bristle and long, stout, spinous a-, b-, c-, and d-bristle; lateral surface with 1 long bristle between c- and d-bristles, but none between b- and c-bristles; medial surface with 1 short cleaning bristle between the b- and c-bristles, 4 cleaning bristles forming oblique row between c- and d-bristles, and 1 short spinous bristle near base of d-bristle; ventral margin with 3 long, spinous, terminal bristles; medial surface with spines forming rows. End joint with straight stout dorsal claw and 5 bristles (1 of these small and medial).

Maxilla (Figures 29e, 31g): Epipodite with long, slender, hirsute tip reaching to about middle of dorsal margin of basale. Endite I with 3 bristles (2 long, 1 short); endite II with 3 long bristles. Basale: ventral margin with 1 short, backward-pointing, proximal bristle, 1 minute distal bristle, and 1 long, spinous, terminal bristle; dorsal margin with 1 proximal bristle with base on medial side, and 1 short bristle just distal to middle; lateral surface with 1 short proximal bristle. Endopodite: 1st joint with 1 short anterior bristle near middle and 1 long beta-bristle; end joint with terminal bristle reaching well past beta-bristle.

Fifth Limb: (Figure 31h): Exopodial bristles on comb consisting of stout spinous bristle reaching past tip of comb. 2 slender bristles just ventral to base of stout bristle, and 2 pairs of bristles near ventral margin of comb; dorsal margin of comb with hairs near tip; ventral margin of comb with few distal bristles about longer than proximal bristles.

Sixth Limb (Figures 29f,g, 31i): Small medial spine present in anterodorsal corner. Anterior margin with upper and lower bristle; anterior corner of skirt with 1 very long bristle and 1 or 2 small bristles (long bristle about 5 times length of small bristle); 1 or no bristle present in middle of ventral margin and on posteroventral corner; posterior end of skirt not unusually broad; lateral flap at anterior end of skirt hirsute but without bristles.

Seventh Limb (Figure 29h): Each limb with 12 bristles, 6 proximal (3 on each side) and 6 distal (3 on each side); each bristle with 2–4 bells. Terminus consisting of opposing combs, each with about 12 spinous teeth.

Furca (Figure 31j): Each lamella with 7 or 8 claws decreasing in size posteriorly; posterior claws not oriented backwards.

Bellonci Organ (Figure 31l): Elongate, broadening near middle, with rounded tip.

Eyes (Figure 31l): Medial eye with black pigment, hirsute dorsally. Lateral eyes well developed, about same size as medial eye, with black pigment and numerous ommatidia (difficult to count because of black pigment).

Upper Lip (Figure 31l): Consisting of 2 hirsute lobes without spines. Hirsute lateral flap present on each side of mouth.

Posterior of Body (Figures 29i, 31j): With long, thumb-like, dorsal process hirsute distally.

Y-Sclerite (Figure 31j): Typical for subfamily (see Kornicker, 1975:686).

Eggs: USNM 122901 with 7 eggs in marsupium.

DESCRIPTION OF JUVENILE FEMALE (A-2? instar) (Figure 32).—Carapace and infold similar in shape and morphology to that of adult female (Figure 32a).

Size: USNM 158384A, length 0.96 mm, height 0.50 mm.

First Antenna (Figure 32b): Dorsal margin of 3rd joint with 4 spinous bristles; d-bristle represented by minute pointed spine with pore near base; limb otherwise similar to that of adult female.

Second Antenna (Figure 32c): Similar to that of adult female.

Mandible (Figure 32d): Dorsal branch of coxale endite broken off both limbs of specimen examined. Long subterminal bristle of basale reaching end of 2nd endopodial joint. Endopodite: 2nd joint without bristle proximal to a-bristle on dorsal margin, and only 2 cleaning bristles present between c- and d-bristles. Limb otherwise similar to that of adult female.

Maxilla (Figure 32e): Basale: proximal lateral bristle and small, distal, ventral bristle not observed. Limb otherwise similar to that of adult female.

Fifth Limb (Figure 32f): Similar to that of adult female.

Sixth Limb (Figure 32g): Long bristle at anterior tip of skirt about 7 times length of short bristle. Limb otherwise similar to that of adult female.

Seventh Limb (Figure 32h): Bristles tapering distally, and only 4 bristles in distal group (2 on each side): 6 bristles in proximal group (3 on each side); each bristle with 1 or 2 bells. Terminus with opposing combs, each with 8 or 9 spinous teeth.

Furca: Each lamella with 7 claws decreasing in length and width posteriorly along lamella; posterior claws not oriented backwards; posterior margins of claws with short teeth separating longer teeth; claws 1 and 2 with few distal hairs along anterior margin; claw 1 of right lamella anterior to claw 1 of left lamella.

Bellonci Organ (Figure 32i,j): Similar to that of adult female.

Eyes: Medial eye with black and brown pigment, hirsute dorsally (Figure 32i,j). Lateral eye about same size as medial eye, with many ommatida (difficult to count because of black pigment) (Figure 32i).

Upper Lip (Figure 32k), Posterior of Body, Y-Sclerite: Similar to those of adult female.

Gill-like Structures: Well developed, 7 on each side of posterodorsal part of body.