Bathyvargula walfordi Poulsen 1962

Bathyvargula walfordi Poulsen

Bathyvargula walfordi Poulsen, 1962:222, fig. 105.—Eagar, 1971:60.

HOLOTYPE.—1 ♂ in last larval stage, unique specimen, Universitets Zoologiske Museum, Copenhagen, Denmark.

TYPE-LOCALITY.—Galathea station 626, lat. 42°10′S, long. 170°10′E, Tasman Sea, 610 m.

MATERIAL EXAMINED.—None. DIAGNOSIS.—Surface of carapace finely striate. Length of N–1 instar 2.8 mm.

First antenna: Sensory bristle of 1st joint with 7 proximal fairly broad filaments. Lateral eyes: Absent.

Upper lip: Posterior tusks short and followed by small teeth.

DISTRIBUTION.—The species is known only from the type-locality (Figure 34).

Cypridinodes Brady, 1902

TYPE-SPECIES.—Cypridinodes favus Brady, 1902.

Three species in this genus are represented in the study area: C. wyvillethomsoni (Brady, 1880), C. reticulata Poulsen, 1962, and C. asymmetrica (Miiller, 1906a). The type-locality of C. favus is unknown, and, conceivably, it could be in the study area.

DIAGNOSIS OF GENUS.—Carapace ovoid in lateral view with overhanging rostrum, fairly broad deep incisur, and caudal process; surface smooth, punctate, or with lateral projections and longitudinal ribs; some species with lunate process below incisur of right valve.

First antenna: Adult male with sucking discs on b- and c-bristles.

Second antenna: Endopodite similar in male and female, 3-jointed: 1st joint with 4 or 5 bristles, 2nd joint bare or with small distal bristles, 3rd joint with long terminal filament.

Maxilla: Exopodite small, 1st joint of endopodite long, narrow.

Sixth limb: End joint elongate, strongly tapering posteriorly, with 2 broad plumose bristles at tip.

Seventh limb: Terminus with large movable jaw opposite comb.

Furca: Each lamella with 6 to 8 claws; claw 2 either separated from lamella by suture or fused to lamella, remaining claws with basal suture.

Lateral eyes, medial eye, and rod-shaped organ: Well-developed lateral eyes except in C. reticulata; medial eye large, cylindrical, pigmented; rod-shaped organ short.

Upper lip: Lip consisting of anterior lobe and 2 posterior tusks, each with posterior margin of broad proximal part toothed or serrate.

DISTRIBUTION.—The three species of Cypridinodes represented in the study area are from the Tasman Sea between Australia and New Zealand (Figure 35).

This genus is found in the Indo-West-Pacific region as defined by Ekman (1953:11). The range extends eastward into the Pacific as far as the Samoa Islands and westward into the Indian Ocean in the vicinity of Madagascar and into the Red Sea. The northernmost extent of its range is the South China Sea (Pescadoro Islands). The southernmost extent is in the Tasman Sea between Australia and New Zealand. The southernmost latitude at which a member of the genus has been collected is 42°10′S in the Tasman Sea.

Cypridinodes wyvillethomsoni was collected in only one locality, at a depth of 610 m; C. asymmetrica is represented by only 1 juvenile collected at a depth of 70–100 m. Species of the genus have been collected in shallow coastal waters (8 m) as well as at depths of 610 m., but most species live in shelf waters shallower than 100 m. Males and juveniles are occasionally collected in coastal surface waters. It is probably significant that the only species without lateral eyes is C. reticulata, collected at a depth of 610 m. Species in the genus collected at depths of less than 100 m. have well-developed lateral eyes.