The Isopods of Abyssal Depths in the Atlantic Ocean

ABYSSAL ATLANTIC ISOPODS 125
Figure 24. A-C: Stylomesus granulosus, n. sp. A: dorsal view male holotype; B: first male
pleopod, C: first male paraeopod. D-G: Stylomesus spinulosus, n. sp. D: dorsal view fragment
female holotype; E: second pleopod male paratype; F: uropod male; G: first
pleopod male. H-K: Stylomesus elegans, n. sp. H: dorsal view male holotype; I: first pleopod
male; J: first male paraeopod; K: male uropod.
Diagnosis: Stylomesus without lateral spines on
peraeon or pleon. Body strongly granulate. Pleon
with lateral swellings indicating only one coalesced
somite. First article of uropoda extending beyond
apex of pleon by one-half its length. Apex of male
first pleopods with short truncated lateral processes
and each with four apical setae.
Measurements: Male holotype length 8.9 mm.,
width pleon 1.1 mm., female allotype length 7.2 mm.,
width pleon 0.8 mm.
Type locality: South Atlantic, L.G.O. Biotrawl No.
51, types plus one male and four fragmentary para-
types, cat. no. 1-101
Distribution: Known only from type locality.
Affinities: This species is allied with S. elegans, from
which it differs in lacking a central transverse depression
from the dorsum of the pleon
Stylomesus spinulosus, new species
Figure 24 D-G
Synonyms: None.