Eusarsiella janiceae (Kornicker 1976)

Sarsiella janiceae

HOLOTYPE.—USNM 151922, ovigerous female in alcohol, and on slides.

TYPE-LOCALITY.—Seaward side of Paiko Peninsula, leeward of reef, Maunalua Bay, Oahu Island, Hawaii.

ETYMOLOGY.—The species is named for Mrs. Janice Neill, one of the collectors.

PARATYPES.—Sample 1: USNM 152456, 1 adult female; USNM 152457, 1 ovigerous female. Sample 2: USNM 154195, 1 ovigerous female and 3 specimens including a very early instar.

DESCRIPTION OF ADULT FEMALE.—Carapace oval in lateral view with projecting caudal process and slight indentation in middle of anterior margin representing an incisur (Figures 1, 2a, 3a–c, 4 a).

Ornamentation (Figures 1, 2): Carapace with a horizontal rib above and below middle of valve connected together at ventral and posterior ends to form oval; anterior part of lower rib with a rib forming a loop; anterior end of loop intersecting lower rib at its anterior end; posterior end of loop intersecting lower rib at point posterior to valve middle; dorsal rib present parallel to dorsal margin of valve (Figure 1); surface of valve with shallow fossae containing short truncate processes (Figure 2c); area between fossae with cauliflower-like low processes (Figure 2c–e); bristles emerging from closed pores scattered over valve surface and along anterior and ventral valve margins (Figure 2d); some pores with bristles with raised peripheral rim (Figure 2f).

Infold: Anterior infold slightly below valve middle with minute bristle near inner margin (Figure 4a); posterior infold with 2 setose bristles dorsal to caudal process (Figure 4b); caudal process with 4–13 minute bristles forming row plus 2 or 3 minute bristles near inner margin (Figures 3b,c, Figure 4b,c).

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

Central Adductor Muscle Scars (Figure 3d–f): Consisting of about 10 individual scars.

Size: USNM 152456, length 1.11 mm, height 0.87 mm; USNM 152457, length 1.13 mm, height 0.89 mm; USNM 151922, length 1.12 mm, height 0.88 mm.

First Antenna (Figure 4d): 1st joint bare; 2nd joint with 1 spinous dorsal bristle and few spines on lateral surface; 3rd joint fused to 4th, with 2 bristles, 1 vental, 1 dorsal; 4th joint long with 2 bristles, 1 ventral, 1 dorsal; sensory bristle of 5th joint with 2 minute marginal filaments; 6th joint with small medial bristle near dorsal margin. Seventh joint: a-bristle about 3-times length of bristle of 6th joint; b-bristle bare, about twice length of a-bristle; c-bristle about same length as sensory bristle of 5th joint, with 3 minute marginal filaments. Eighth joint: d- and e-bristles bare, equal in length, slightly shorter than c-bristle; f- and g-bristles same length as c-bristle; f-bristle with 3 minute marginal filaments, g-bristle with 1. Right limb of USNM 152457 aberrant in having e-bristle branching from g-bristle near base (distance from base equal to length of bristle of 6th joint).

Second Antenna: Protopodite bare; endopodite 1-jointed with 2 short anterior bristles and small mound at middle of ventral margin (Figure 4e). Exopodite: terminal margin of 1st joint with small medial bristle; bristle of 2nd joint with few proximal hairs on dorsal margin, about 23 spines on ventral margin, and then natatory hairs on both margins; bristles of joints 3–8 with ventral spines followed by natatory hairs on both margins; 9th joint with 3 bristles, 2 long with spines followed by natatory hairs, and 1 short, bare.

Mandible (Figure 4f): Coxale endite consisting of sharp spine; ventral margin of coxale hirsute with base of hairs on lateral surface. Basale: medial surface with 4 bristles near ventral margin; dorsal margin with 1 midbristle and 1 subterminal bristle. Endopodite: medial surface of 1st joint with distal spines and 2 minute bristles near base of main claw; 2nd joint with minute subterminal bristle on dorsal margin and main claw on ventral margin; 3rd joint with small bristle near ventral and dorsal margins of base of main claw. Exopodite absent.

Maxilla (Figure 4g): Coxale with 1 short anterior bristle; endite I with 6 bristles; endite II with about 3 bristles; endite III with about 6 bristles; basale with 1 bristle near base of exopodite; exopodite with 2 bristles, inner bristle shorter than outer bristle. Endopodite: 1st joint with alpha and beta bristles with slender marginal spines; 2nd joint with 2 posterior a-bristles, 1 anterior c-bristle, and 5 pectinate terminal bristles.

Fifth Limb (Figure 4h): Epipodial appendage with 36 bristles; single endite present with 1 short bristle. Exopodite: 1st joint with 2 bristles; 2nd to 5th joints fused; 2nd joint with 3 bristles; 3rd to 5th joints with total of 6 bristles.

Sixth Limb (Figure 4i): Single endite present with 3 bristles; end joint with 11 or 12 slender bristles, either with short marginal spines or bare, followed by 2 stout hirsute bristles; limb with long hairs on posterior half.

Seventh Limb (Figure 4j): Each limb with 8 bristles, 2 proximal, 1 on each side, and 6 terminal, 3 on each side; each bristle with 3–7 bells and no marginal spines; terminus with opposing combs, each with 4 or 5 opposing teeth.

Furca (Figure 4k): Each lamella with 5 claws; claw 1 continuous with lamella, others separated from lamella by suture; claws 1–4 with large and small teeth along posterior margins; left lamella with 2 spines following claw 5; medial hairs present near base of claw 1.

Eyes and Rod-shaped Organ (Figure 4l): Lateral eye small with 5 minute ommatidia; medial eye bare, pigmented, larger than lateral eye; rod-shaped organ elongate, 1-jointed with rounded tip.

Upper Lip: Helmet shaped without hairs or spines (Figure 4l).

Anterior of Body: Triangular process present between medial eye and upper lip (Figure 4l).

Genitalia: Cuplike spermatophore present on USNM 152457 (Figure 4m).

Y-shaped Sclerite: Normal for family (Figure 4m).

Eggs: USNM 152457 with 7 eggs in marsupium.

Food: USNM 152457 with almost whole empty skeleton of a copepod partway out anus posterior end first (Figure 4k).

Comparisons: The new species Sarsiella janiceae differs from previously described species in the genus in having a looplike rib extending ventrally from the lower horizontal midrib.

Ancohenia, new genus

TYPE-SPECIES.—Ancohenia hawaiiensis, new species, monotypy.

ETYMOLOGY.—The genus is named after the principal collector, Anne Cohen, Smithsonian Institution. Gender: feminine.

DIAGNOSIS OF GENUS.—Carapace of female without incisur and with minute caudal process; infold of caudal process with few bare bristles; surface without ridges or ribs.

First Antenna: f- and g-bristles of 8th joint of female short, clawlike; these bristles on adult male clawlike proximally, bristle-like distally. New genus based primarily on the clawlike f- and g-bristles of the female.

Second Antenna: Endopodite of adult male 3-jointed.

Mandible: Adult male limb with well-developed hirsute exopodite; endopodite with stout claw on each joint; claw on 2nd joint with blunt tip.

Seventh Limb: Fairly well developed on adult male but with only distal bristles, and terminus bare.

Lateral Eyes: Present.

Rod-shaped Organ: Elongate but short.

Furca: Main Claws 1, 2, 4 joined to lamella; secondary claws 3, 5, and sometimes 6 separated from lamella by suture.

Comparisons: The new genus Ancohenia differs from most previously described genera in the family in having clawlike f- and g-bristles on the 8th joint of the female 1st antenna. The distribution of claws on the furca resembles that of Chelicopia, Kornicker 1958, but that genus does not have claw-like f- and g-bristles. Anscottiella crispata (Scott, 1905) bears on the 1st antenna stout clawlike c-, f- and g-bristles and has only 4 furcal claws.