Sarsiella anommata Kornicker & Caraion 1978

Sarsiella anommata

HOLOTYPE.—USNM 141559, ovigerous female, on slides and in alcohol.

TYPE-LOCALITY.—Station X054.

ETYMOLOGY.—The specific name “anommata” is derived from the Greek “an” (= not, without, privative) + “omma” (= eye) and refers to the absence of lateral eyes on this species.

PARATYPE.—“Grigore Antipa” 299, A–1 female from same sample as holotype.

DISTRIBUTION.—Collected at only the type-locality.

DESCRIPTION OF ADULT FEMALE (Figures 15–17a–j; Plate 8).—Carapace oval in lateral view with elongate, backward pointing, caudal process and without incisur (Figures 15, 16a).

Ornamentation (Figure 15): Surface of each valve punctate with upper and lower rib meeting at posterodorsal corner; 3 faint radial riblets present along anterior margin; long bristles along anterior and ventral margin and sparsely distributed on valve surface (Plate 8a,b); surface of valve with fossae containing inward pointing spines (Plate 8b–f); surface between fossae with minute pits (Plate 8b,c) and papillae (Plate 8d–f).

Infold: Anterior infold with minute bristle near valve midheight (Figure 16b,d); infold of caudal process with 8–10 small bristles in addition to 1 or 2 bristles at inner margin (Figure 16b,c,e); posterior infold with 2 setose bristles dorsal to caudal process (Figure 16b,c,e).

Central Adductor Muscle Scars: Consisting of about 11 ovoid scars.

Selvage: Wide lamellar prolongation along anterior, ventral and posterior valve margins.

Size: USNM 141559, length excluding caudal process 1.22 mm, length with caudal process 1.40 mm, height 1.06 mm.

First Antenna (Figure 16f): 1st joint: bare. 2nd joint: few spines along dorsal margin and 1 spinous dorsal bristle. 3rd joint: fused to 4th, with 2 spinous bristles (1 ventral, 1 dorsal). 4th joint: 4 spinous bristles (1 dorsal, 3 ventral). 5th joint: sensory bristle with 3 minute filaments (1 proximal, 1 near-middle, 1 subterminal). 6th joint: small medial bristle near dorsal margin. 7th joint: a-bristle short spinous; b-bristle bare, slightly longer than a-bristle; c-bristle same length as sensory bristle of 5th joint, with 3 minute filaments (1 proximal, 1 near middle, 1 subterminal) and with small spine at tip. 8th joint: d- and e-bristles bare, slightly shorter than c-bristle; f-bristle same length as c-bristle, with 1 minute subterminal filament and small spine at tip; g-bristle same length as c-bristle, with 4 minute filaments (2 proximal, 1 near middle, 1 subterminal), and with small spine at tip.

Second Antenna: Protopodite bare. Endopodite 1-jointed with bare terminal protuberance and 2 anterior bristles with few marginal spines (Figure 16g). Exopodite: 1st joint with slender medial spine on distal margin; bristle of 2nd joint with few long hairs proximally on dorsal margin followed by slender spines on ventral margin and then natatory hairs on both margins; bristles of joints 2–8 with natatory hairs, some with few slender ventral spines; 9th joint with 3 bristles (1 short with short marginal spines, 2 long with natatory hairs).

Mandible (Figure 16h): Coxale endite consisting of minute spine; ventral margin of basale with long hairs. Basale: dorsal margin with 2 subterminal bristles; medial side near ventral margin with 3 bristles; ventral margin with 1 minute distal bristle; lateral side without bristles (absence probably aberrant; see description of A–1 female which follows). Endopodite: 1st joint with distal medial spines, row of terminal lateral spines, 1 minute terminal bristle on dorsal margin, and 1 minute medial bristle at base of bare ventral claw; 2nd joint with minute terminal bristle on dorsal margin and bare ventral claw; 3rd joint with 3 minute bristles at base of main claw (1 dorsal, 2 ventral). Exopodite represented by minute bifurcate process on lateral side a small distance from dorsal margin (Figure 16i).

Maxilla (Figure 17a): Precoxale and coxale with fringe of hairs along dorsal margin; coxale with short dorsal bristle. Endite I with about 5 bristles; endites II and III with total of about 9 bristles. Basale with 1 slender bristle near base of exopodite. Exopodite with 2 bristles, one of these about half length of other. Endopodite: 1st joint with pectinate α- and β-bristles; 2nd joint with 2 a-bristles, 1 c-bristle and usual 5 b- and d-bristles.

Fifth Limb (Figure 17b): Single endite with 1 short bristle. Exopodite: hirsute; 1st joint with 2 spinous bristles; joints 2–5 fused; 2nd joint with 3 spinous bristles separated from joints 3–5 by space; joints 3–5 with total of 4 spinous bristles.

Sixth Limb (Figure 17c,d): Single endite with 3 short bristles; end joint with 10–12 spinous bristles and 2 stout, hirsute, posterior bristles.

Seventh Limb (Figure 17e): Proximal group with 2 bristles (1 on each side); distal group with 6 bristles (3 on each side) each with 3–6 bells, proximal 3 bells on long distal bristles longer than remaining bells; tip of limb bare, without combs.

Furca (Figure 17f): Each lamella with 5 slender claws followed by 2–4 minute points and hairs; claw 1 fused to lamella, remaining claws separated by suture; claws with teeth along posterior margins and hairs along anterior margins; some teeth longer than others; few spines present along anterior margin of lamellae; long hairs present on inner side of lamellae near bases of claws.

Rod-shaped Organ (Figure 17g): 1-jointed with rounded tip.

Eyes: Lateral eyes absent; medial eye small, unpigmented (Figure 17g).

Upper Lip (Figure 17g): Helmet-shaped projecting anteriorly, hirsute.

Genitalia (Figure 17i,j): Consisting of 2 oval sclerotized rings, one of these cuplike.

Brushlike Organ (Figure 17h): Consisting of 6 minute, slender, ringed bristles.

Y-Sclerite (Figure 17i): Typical for family.

Eggs: USNM 141559 with 3 eggs in marsupium.

DESCRIPTION OF A–1 FEMALE (Figure 17k).—Carapace similar to that of adult female except posterior less truncate.

Ornamentation: With upper and lower rib meeting in posterodorsal corner as on adult female carapace.

Infold: Not examined.

Size: “Grigore Antipa” 299, length 1.21 mm, height 0.87 mm.

First Antenna: Similar to that of adult female. Second Antenna: Similar to that of adult female except 9th joint of exopodite with only 2 bristles (1 long, 1 short).

Mandible: Lateral side of basale with 2 small bristles; limb otherwise similar to that of adult female.

Fifth and 6th limbs: Not examined in detail but, in general, similar to limbs of adult female.

Seventh Limb: Proximal group with 2 bristles (1 on each side); distal group with 4 bristles (2 on each side); bristles strongly tapering and with 2 or 3 bells.

Furca: Left lamella with 6 slender claws, right lamella with 5; claw 1 fused to lamella, remaining claws separated from lamella by suture; claws with teeth along posterior margin.

Rod-shaped Organ: 1-jointed with rounded tip.

Eyes: Lateral eyes absent; medial eye small unpigmented.

Upper Lip: Similar to that of adult female.

COMPARISONS.—Ornamentation on the carapace of Sarsiella anommata resembles that on the carapace of S. murrayana Scott, 1894. Sarsiella anommata differs from S. murrayana in having a more elongate caudal process and in lacking lateral eyes. Sarsiella anommata differs from Parasarsiella globula (Brady, 1887) in being smaller and in having fewer claws on the furca. Sarsiella anommata differs from S. capsula Norman, 1869, in having a longer caudal process and in lacking lateral eyes.