202 Chapter 6 Ostracods
veloped antennule, antenna and mandible, and
an arcuate upper lip without any glandular field.
The last -named sample also carried severallarge
but empty globular egg cases of this species. The
stomach of the largest specimen contained decapod larvae and both calanoid and cyclopoid
copepods, mostly ingested whole. The single
specimen of Martens (1979) was an A4 juvenile.
Poulsen ( 1962) records the length of adults as
4.8-6.6 mm (males) and 4.6-6.4 mm (females).
We have found many more specimens in the latest samples from Magellan Straits.
~he ge~~s Macrocypridina is defined readily
by Its undlVlded upper lip which is semicircular,
evenly rounded and serrated by numerous glandular openings ventrally, with some small pastero-lateral processes; of these, the postero-ventral
process is divided into 3 short tubes. Poulsen
( 1962) records several minor differences between adults of this species and the type (and
only other described) species, M. castanea- well
des~ribed by Skogsberg (1920)- noting that the
mam character of difference is the smaller number of distal cleaning bristles on the 7th limb in
M. poulseni (9-13 dorso-distal and 12-14 ventro-distal bristles). However, in the new material
we have a male in which the 7th limb has 18 dorso-distal and 17 ventro-distal bristles.
Distribution
Poulsen (1962) gives the latitudinal range of this
taxon as extending from 37°05 'N to 46°58 'S, in
the Indian and Pacific Oceans, from near the east
coast of South Africa to the Bay of Panama. The
lone juvenile recorded by Martens (1979) carne
from off the coast of Chile at 37°10'5. Angel
( 1981) states that M. castanea is an upper mesopelagic species found in all oceans between 56°N
~nd 50°S; this range and distribution probably
mcludes some specimens of M. poulseni. Even
so, our record is the most southerly yet recorded
for the species, although Hartmann (1985) notes
that i.t occurs .in the Antarctic, but without giving
locahty detatls. According to Poulsen (1962),
who had access to the most abundant material,
the depth range of this species is from 50-4000
m. Martens' specimen was collected near the
surface; he considers that the species characterizes Antiboreal Bottom and Subtropical Water
(Martens 1979). Our six juveniles were collected
at mesopelagic-shallow depths in the western
part of the Straits (53°31 'S, 72°38 'W).
veloped antennule, antenna and mandible, and
an arcuate upper lip without any glandular field.
The last -named sample also carried severallarge
but empty globular egg cases of this species. The
stomach of the largest specimen contained decapod larvae and both calanoid and cyclopoid
copepods, mostly ingested whole. The single
specimen of Martens (1979) was an A4 juvenile.
Poulsen ( 1962) records the length of adults as
4.8-6.6 mm (males) and 4.6-6.4 mm (females).
We have found many more specimens in the latest samples from Magellan Straits.
~he ge~~s Macrocypridina is defined readily
by Its undlVlded upper lip which is semicircular,
evenly rounded and serrated by numerous glandular openings ventrally, with some small pastero-lateral processes; of these, the postero-ventral
process is divided into 3 short tubes. Poulsen
( 1962) records several minor differences between adults of this species and the type (and
only other described) species, M. castanea- well
des~ribed by Skogsberg (1920)- noting that the
mam character of difference is the smaller number of distal cleaning bristles on the 7th limb in
M. poulseni (9-13 dorso-distal and 12-14 ventro-distal bristles). However, in the new material
we have a male in which the 7th limb has 18 dorso-distal and 17 ventro-distal bristles.
Distribution
Poulsen (1962) gives the latitudinal range of this
taxon as extending from 37°05 'N to 46°58 'S, in
the Indian and Pacific Oceans, from near the east
coast of South Africa to the Bay of Panama. The
lone juvenile recorded by Martens (1979) carne
from off the coast of Chile at 37°10'5. Angel
( 1981) states that M. castanea is an upper mesopelagic species found in all oceans between 56°N
~nd 50°S; this range and distribution probably
mcludes some specimens of M. poulseni. Even
so, our record is the most southerly yet recorded
for the species, although Hartmann (1985) notes
that i.t occurs .in the Antarctic, but without giving
locahty detatls. According to Poulsen (1962),
who had access to the most abundant material,
the depth range of this species is from 50-4000
m. Martens' specimen was collected near the
surface; he considers that the species characterizes Antiboreal Bottom and Subtropical Water
(Martens 1979). Our six juveniles were collected
at mesopelagic-shallow depths in the western
part of the Straits (53°31 'S, 72°38 'W).