Comprehensive Description

provided by Smithsonian Contributions to Zoology
Pallenopsis (Bathypallenopsis) longiseta Turpaeva

Pallenopsis mollissima.—Schimkewitsch, 1893:41–43, pl. II: fig. 24 (necHoek, 1881).

Pallenopsis longiseta Turpaeva, 1957:359–361, fig. 2.

Pallenopsis (Bathypallenopsis) longiseta.—Stock, 1975:1042–1043, fig. 36.

MATERIAL EXAMINED.—CALIFORNIA: Cr Pulse III, sta 312M (2); Pulse VIII, sta 803M (1); Pulse IX, sta 910M 1). Farallons sta F-1 (5, 6); Farallons sta F-3 (1, 2); Monterey sta M-1 (1 without legs); Monterey sta M-6 (1).

DISTRIBUTION.—This species was described from the Sea of Okhotsk and the Bering Sea in 1228 and 3820 m respectively. These specimens from mid-California in 2820–3200 m and the San Clemente Basin off southern California in 4100 m greatly extend the known distribution of the species and slightly extend its depth range.

Schimkewitsch (1893) deposited his American specimens with the National Museum of Natural History and Stock (1975) reexamined the Gulf of Panama specimen which Schimkewitsch had called Pallenopsis mollissima, and discovered it to be a male of Turpaeva's P. longiseta. Schimkewitsch's specimen is from 3058 m. The species then, is known from the Russian Arctic, the Bering Sea, middle and southern California, and from the Gulf of Panama, certainly a scattered distribution which probably reflects the lack of extensive collections from deep-water localities rather than any rarity of the species. It and other species in this report are possibly quite common in the deep slopes and basins of the Pacific Ocean.

DIAGNOSIS.—A species of the mollissima-group (Stock, 1975). Species with mixed setae/spines on oviger terminal segment which differentiates this species from P. (B.) mollissima. Trunk segmentation lines with distinctive middorsal point directed anteriorly and not raised above curved surface of dorsum. Second scape segments not as long as first and leg tibiae bear long lateral setae as with P. (B.) comosa. This species with notably fewer sole spines than P. (B.) comosa, but it bears two long heel spines. Lateral processes with several short dorsal spines which are inconspicuous.
bibliographic citation
Child, C. Allan. 1994. "Deep-sea Pycnogonida from the temperate west coast of the United States." Smithsonian Contributions to Zoology. 1-23. https://doi.org/10.5479/si.00810282.556