The Isopods of Abyssal Depths in the Atlantic Ocean

Distribution: Also found at L.G.O. Biotrawl No.
14, one female fragment, cat. no. 1-202.
Affinities: This species closely resembles H. telus,
but has the pleon more quadrate than tapering or
pointed.
Haploniscus polaris, new species
Figure 12 A-B
Synonyms: None.
Diagnosis: Frontal border convex, with minute
medial projection. Pleon set in from peraeon.
Flagellum of first antenna with four articles. Posterolateral
angles of pleon projecting beyond medial
margin. Dorsum of pleon with a slight ridge forward
of each uropod. Uropods not extending to posterolateral
border of pleon. Antero-lateral border of
ABYSSAL ATLANTIC ISOPODS 105
fourth peraeonal somite not produced forward.
Measurements: Holotype female length 2.1 mm.,
width pleon 0.8 mm.
Type locality: South Atlantic, type only, L.G.O.
Biotrawl No. 52, cat. no. 1-32.
Distribution: Known only from type locality.
Affinities: This species is closely related to H.
antarcticus VanhdfFen, from which it differs in having
a relatively longer pleon and in having only four
articles, not five, to the flagellum of the first antenna.
Haploniscus telus, new species
Figure 12 C-E
Synonyms: None.
Diagnosis: Frontal border excised, entire. Pleon
Figure 12. A-B: Haploniscus polaris, n. sp. A: fenaale holotype dorsal view; B: first antennal
flagellum. C-E: Haploniscus telus, n. sp. C: female holotype dorsal view; D: anus and uropods;
E: first antenna. F-G: Haploniscus tricornoid.es, n. sp. F: female holotype dorsal view; G: first
antenna. H-I: Haploniscus tropicalis, n. sp. H: immature female holotype dorsal view; I: first
antenna.