3.5 Rhachotropis schellenbergi
Andres, 1982
Rhachotropis sp. Schellenberg, 1931: p. 173.
Rhachotropis schellenbergi Andres, 1982: p. 174,
figs. 12-15a.
Body length -
males: 9.6-10.0 mm (8 specimens)
females: 7-9 mm (6 specimens)
Male. Mesosome smooth; 1st to 3rd segments of
metasome tricarinate. Median keel of 3rd metasomal segment rounded posteriorly. 1st epimeral plate lacking teeth. 3rd epimeral plate rounded
and serrated. lst coxal plate protruding forward.
1 st segment of flagellum on antennulae bearing
numerous aesthetascs. 2nd antennae with last
two articles of peduncle bearing calceoli. 1st and
2nd pereopods similar to gnathopods. 3rd and
4th pereopods slender and equal in length; 5th
and 6th pereopods very thin. Length and width
of the hasis increasing from 5th to 7th pereopods. Outer rami of 1st and 2nd uropods shorter
than inner rami. Rami of 3rd uropod almost of
the same length. Margins of uropodal rami with
small spines. Telson long and cleft up to almost
1/2 its length; both lobes notched terminally and
bearing one seta each. Plumose seta inserted
proximally on both sides.
Female. General shape as in male, except for the
shorter antennae and the scarcity of 1st antennae
aesthetascs.
Remarks
According to Andres (1982), the rounded lst epimeral plate and the absence of teeth on the 1st
urosomal segment allow the easy identification
of the species from the congeneric species R. antarctica.
Distribution
An dres ( 1982) reports the locus typicus of the
species as the Antarctic Ocean ( 61 °29'S, 56°
20'W) at a depth of 325 m. In the Straits of Magellan, it was present only in the area ofPaso Ancho with a vertical depth range from 50-200 m
(St. 19).
Andres, 1982
Rhachotropis sp. Schellenberg, 1931: p. 173.
Rhachotropis schellenbergi Andres, 1982: p. 174,
figs. 12-15a.
Body length -
males: 9.6-10.0 mm (8 specimens)
females: 7-9 mm (6 specimens)
Male. Mesosome smooth; 1st to 3rd segments of
metasome tricarinate. Median keel of 3rd metasomal segment rounded posteriorly. 1st epimeral plate lacking teeth. 3rd epimeral plate rounded
and serrated. lst coxal plate protruding forward.
1 st segment of flagellum on antennulae bearing
numerous aesthetascs. 2nd antennae with last
two articles of peduncle bearing calceoli. 1st and
2nd pereopods similar to gnathopods. 3rd and
4th pereopods slender and equal in length; 5th
and 6th pereopods very thin. Length and width
of the hasis increasing from 5th to 7th pereopods. Outer rami of 1st and 2nd uropods shorter
than inner rami. Rami of 3rd uropod almost of
the same length. Margins of uropodal rami with
small spines. Telson long and cleft up to almost
1/2 its length; both lobes notched terminally and
bearing one seta each. Plumose seta inserted
proximally on both sides.
Female. General shape as in male, except for the
shorter antennae and the scarcity of 1st antennae
aesthetascs.
Remarks
According to Andres (1982), the rounded lst epimeral plate and the absence of teeth on the 1st
urosomal segment allow the easy identification
of the species from the congeneric species R. antarctica.
Distribution
An dres ( 1982) reports the locus typicus of the
species as the Antarctic Ocean ( 61 °29'S, 56°
20'W) at a depth of 325 m. In the Straits of Magellan, it was present only in the area ofPaso Ancho with a vertical depth range from 50-200 m
(St. 19).