The Isopods of Abyssal Depths in the Atlantic Ocean

ABYSSAL ATLANTIC ISOPODS
Figure 27. A-C: Macrostylis truncatex, n. sp. A: dorsal view holotype; B: first antenna;
C: first male pleopod. D-E: Macrostylis abyssicola Hansen. D: dorsal view female (3.9 mm.);
E: first and second antenna. F-H: Macrostylis setifer, n. sp. F: dorsal view male holotype;
G: first male pleopod; H: first antenna.
Macrostylis abyssicola Hansen
Figure 27 D-E
Synonyms: Macrostylis abyssicola Hansen, 1916, pp.
77-79, PI. VII.
Diagnosis: Cephalon quadrate. Peraeonal somite
4 slightly narrower than 3 but not narrower than 5;
lateral borders rounded slightly. First and second
peraeonal somites subequal in length. Uropoda as
long as pleon; peduncle produced at apex and five
times as long as second article. Dorsum of pleon
with pits above uropods; plumose setae absent,
apex produced, convex. Apex male first pleopods
simple. First antenna with only three articles
(female).
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Measurements: Female without marsupium 3.1 mm.,
male 2.4 mm. (Hansen, op. cit.).
Type locality: North Atlantic, Davis Strait, Ingolf
Station 37, latitude 60° 17' N., longitude 54° 05' W.,
3229 meters, temperature 1.4° C, three specimens.
Distribution: Also collected south of Davis Strait,
Ingolf Station 38, latitude 59° 12' N., longitude 51°
05' W., 3521 meters, temperature 1.3° C, about ten
specimens, and south of Davis Strait at Ingolf Station
22, latitude 58° 10' N., longitude 48° 25' W., 3474
meters, temperature 1.4° C, six specimens, and from
the South Atlantic from L.G.O. Biotrawl No. 23, two
females, cat. no. 1-120.
Affinities: The quadrate shape of the cephalon
distinguishes this species.