Eusarsiella rudescui (Kornicker & Caraion 1978)

Sarsiella rudescui

HOLOTYPE.—USNM 141558, ovigerous female on slides and in alcohol.

TYPE-LOCALITY.—Station X054.

ETYMOLOGY.—The species is named for Professor Doctor Ludwig Rudescu, Director of Section, Institute of Biology, Bucharest, Romania, member of Academy of Sciences of Romania.

PARATYPE.—“Grigore Antipa” 300, ovigerous female in alcohol from same sample as holotype.

DESCRIPTION OF ADULT FEMALE (Figures 38–41; Plates 25, 26).—Carapace oval in lateral view with elongate caudal process and without incisur; carapace swollen in posterodorsal part.

Ornamentation (Figure 39; Plates 25, 26c): Carapace with low lateral horizontal rib above valve middle meeting in posterior part of valve a convex rib that continues anteriorly below central muscle scar area (Figure 39; Plate 25a,c,d); anterior ends of linear dorsal rib and convex ventral rib almost reaching anterior margin of valve; 3 weak riblets extending from ventral rib towards anteroventral margin of valve; ribs and riblets formed by short spines; long bristles with broad base abundant along anterior and ventral margins of valve and sparsely distributed over lateral surface (Plate 25a,b); shallow fossae abundant; area outside fossae with numerous short papillate spines (Plates 25a,f, 26c); gelatinous substance filling in space between spines (Plate 25c,f).

Infold (Figure 40a,b; Plate 26): Minute bristle present on anterior infold near inner margin (Figure 40b); infold of caudal process with 4 bristles forming row anterior to single bristle (Figure 40a; Plate 26a,b); 2 setose bristles present on posterior infold dorsal to caudal process (Figure 40a); 4 minute bristles present along inner margin of posteroventral infold.

Selvage: Wide lamellar prolongation with smooth outer margin present along anterior, ventral, and posterior margins.

Central Adductor Muscle Scars (Plate 26d): Consisting of about 12 individual scars.

Size (Figure 10): USNM 141558, length 1.38 mm, height including caudal process 1.33 mm, height excluding caudal process 1.13 mm; “Grigore Antipa” 300, length 1.32 mm, height including caudal process 1.22 mm, height excluding caudal process 1.17 mm.

First Antenna (Figure 40c): 1st joint: bare. 2nd joint: 1 spinous dorsal bristle and few faint spines on dorsal margin. 3rd joint: short, fused to 4th, with 2 spinous bristles (1 ventral, 1 dorsal). 4th joint with few faint spines on ventral margin, with 3 bristles (2 ventral, 1 dorsal). 5th joint: sensory bristle with 1 minute proximal filament. 6th joint: short medial bristle on terminal margin. 7th joint: a-bristle short, spinous, about length of 5th joint; b-bristle bare, slightly longer than a-bristle; c-bristle about same length as sensory bristle of 5th joint, with 1 minute proximal filament. 8th joint: d- and e-bristles bare, slightly shorter than c-bristles; f-bristle bare, about same length as c-bristle; g-bristle about same length as c-bristle, with 1 minute proximal filament; minute spine at tip of sensory, c-, f-, and g-bristles.

Second Antenna: Protopodite bare. Endopodite with 2 short anterior bristles and 1 longer terminal bristle, the latter with base on small protuberance (Figure 40d). Exopodite: 1st joint with short medial spine on distal margin: 2nd joint almost 3 times length of 3rd joint; bristle of 2nd joint with long proximal ventral spines and distal hairs; bristles of joints 2–8 with natatory hairs; 9th joint wih 3 bristles (2 long with natatory hairs, 1 short with short marginal spines); joints 2–9 with lateral spines forming row along distal margin, no basal spines present.

Mandible (Figure 40e): Coxale: endite consisting of stout spine; ventral margin with long hairs. Basale: 6 bristles present on or near ventral margin (2 with bases on lateral side, 1 with base on medial side, 3 with base on ventral margin); dorsal margin of basale with 1 short bristle distal to middle and 1 subterminal bristle. Exopodite absent. Endopodite: 1st joint with spines on medial surface and terminally on dorsal margin; 1 minute, faint bristle present medially near base of main claw; 2nd joint with dorsal subterminal bristle and main ventral claw; 3rd joint with 3 bristles at base of main claw (1 dorsal, 2 ventral).

Maxilla (Figure 40f): Endite I with 5 spinous and pectinate bristles; endite II with about 6 bristles; endite III with about 4 bristles. Protopodite with cluster of long hairs near anterior margin. Basale with bristle near base of exopodite. Exopodite with 1 short and 1 long bristle. Endopodite: 1st joint with pectinate and spinous α- and β-bristles; β-bristle with proximal tooth on anterior margin; 2nd joint with 2 a-bristles, 1 c-bristle, and usual 5 pectinate terminal bristles.

Fifth Limb (Figure 40g): Epipodial appendage with 33–34 bristles. Single endite with short bare bristle. Exopodite: 1st joint with 2 spinous bristles; joints 2–5 hirsute, fused; 2nd joint with 3 spinous bristles; joints 3–5 with total of 5 spinous bristles.

Sixth Limb (Figure 41a): Single endite with 3 bristles; end joint with 12 bristles with short marginal spines and 2 stout, hirsute posterior bristles; limb hirsute.

Seventh Limb (Figure 41b,c): Each limb with 2 bristles in proximal group (1 on each side) and 6 in terminal group (3 on each side) each bristle with 3–6 bells; terminus with opposing combs with 5 to 7 teeth.

Furca (Figure 40h): Each lamella with 5 claws followed by 4 spines; claw 1 united to lamella, others separated from lamella by suture; claws 1–4 with teeth along posterior margins, some teeth longer and stouter than others.

Rod-shaped organ: Elongate, 1-jointed with rounded tip (Figure 41d); minute protuberance visible on tip when viewed under oil immersion (X 100 objective).

Eyes: Lateral eyes absent; medial eye bare, unpigmented (Figure 41d).

Upper Lip (Figure 41d): Helmet shaped.

Genitalia (Figure 41e): Oval sclerotized ring.

Y-Sclerite (Figure 41e): Typical for family.

Eggs: USNM 141558 with 5 eggs in marsupium and smaller unextruded eggs within body. “Grigore Antipa” 300 with 4 eggs in marsupium.

COMPARISONS.—In addition to the differences in shell ornamentation, the new species Sarsiella rudescui differs from some specimens of S. africana in that the 3rd bell (counted from the proximal end) of long bristles on the 7th limb is about three-fourths the length of the 2nd bell; the 3rd bell is about one-half the length of the 2nd bell on many specimens of S. africana. The carapace of S. murrayana does not have the abundant short spines present on S. rudescui. The carapace of S. rudescui does not have the 2 posterodorsal processes present on S. neapolis.

Sarsiella species indeterminate

MATERIAL.—From station X046: USNM 156646, 1 juvenile female; USNM 156647, 1 juvenile; USNM 166523, 1 juvenile male and female. USNM 157118, 1 juvenile from station X023. USNM 157119, 1 juvenile from station X005. USNM 157120, 1 juvenile from station X057. USNM 157121, 1 juvenile from station X052. USNM 157122, 1 juvenile from station X055.

Junctichela, new genus

Anscottiella Kornicker, 1975a:607 [in part].

Junctichela Kornicker and McKenzie, 1976 [deliberate nomen nudum].

TYPE-SPECIES.—Junctichela margalefi, new species.

ETYMOLOGY.—Derived from the Latin “junctus” (= unite) and “chela” (= claw). The name refers to the furca of this genus, which bears 3 claws fused to each lamella in addition to claws separated from the lamella by a suture. Gender: feminine.

Two species, Sarsiella similis Scott, 1905, and Sarsiella gracilis Scott, 1905, both from Sri Lanka, have 3 strong claws followed by 3 weak claws. It is not known whether the strong claws are fused to the lamella. However, it is expedient to assume they are and to include them in the new genus as Junctichela similis and Junctichela gracilis.

DISTRIBUTION.—Mauritania, Sri Lanka.

DIAGNOSIS.—Carapace with shallow fossae and abundant short bristles with rounded tips; anterior with minute incisur in female and well developed incisur in male.

First Antenna: 7th and 8th joints with full accompaniment of bristles.

Second Antenna: Endopodite 1-jointed or with minute terminal mound which could represent a 2nd joint. Endopodite of male of type-species not developed as 3-jointed clasper.

Mandible: Without exopodite on male or female.

Maxilla: Exopodite with 2 bristles.

Sixth Limb: With single endite.

Furca: Each lamella with 3 stout claws joined to lamella followed by 2–3 short claws separated from lamella by suture.

COMPARISONS.—The new genus Junctichela differs from other genera in the family Sarsiellidae in having a furca with claws 1–3 joined to the lamella.