3.12 Calanoides patagoniensis
Brady 1883
Calanoides patagoniensis Brady, 1883: p. 75,
pI. 23 figs. 1-10 - Arcos, 1974: p. 219, figs. 7,
8-10; 1975: p. 9, pI. 1 figs. 6-8.
Calanus patagoniensis Giesbrecht, 1892: p.
91, pI. 6 figs. 8, 10, 17, pI. 8 fig. 29.
Body length -
females: 2.08-2.37mm (10 specimens)
males: 2.02-2.41 mm (11 specimens)
F~male. Body slender and elongated. Long
bIfid rostrum. Postero-Iateral margins of last
thoracic somite somewhat elongated.
Proportional lengths of cephalothorax and
abdomen 76: 24; proportional lengths of
abdominal somites and furca 33: 16: 14: 16: 21
= 100. In lateral view, genital somite bears
wide, flap-like structure that almost completely coyers genital aperture. This plate
observed m an upright position or folded
over the genital pores. Often, mucous secretions visible in the gonopore area. P5 B1
lacks de.nt~culation along inner margin
charactenstic of Calanus species. Endopod of
P5 with 6 setae.
Male. Same body shape as female but with
more elongated and slender abdomen.
Proportional lengths of cephalothorax and
Family Calanidae
abdomen 72: 28; proportional lengths of
abdominal so mites and furca 15: 25 : 17: 14 :
14: 15 = 100. P5 asymmetrical, very long and
slender, extending beyond abdomen. B1 with
naked.inner border. Left P5longer than right
~~d wIth reduced, one-joint~d endopod; last
Jomt of exopod ornated with thick tufts
of hairs. Right P5 with longer 3-jointed
endopod. Exopods of left and right P5 ending
with long spine-like seta.
Distribution
This antiboreal species has also been reported
for the Arabian Sea by Sewell (1947). Farran
(1929) .recorded its occurrence in the tropical
AtlantIc Ocean, off Rio de Janeiro. It has
been frequently sampled off the west coast of
South America (Brady 1883) and inshore off
the Chilean coast in sub-Antarctic waters
(Fa~etti 1962; Bjornberg 1973; Arcos 1975;
Mann and Antezana 1985; Hirakawa 1989).
~rcos (1974) recorded it as frequent
In September-October in the Straits of
Magellan, whereas Mazzocchi and Ianora
(1991) reported low abundances for this
species in November when the species was
present mainly at the three most Pacific stations. Very little is known about the vertical
distribution of this species. In the present
study, C. patagoniensis was frequently
sampled in subsurface waters throughout the
Straits of Magellan.
Brady 1883
Calanoides patagoniensis Brady, 1883: p. 75,
pI. 23 figs. 1-10 - Arcos, 1974: p. 219, figs. 7,
8-10; 1975: p. 9, pI. 1 figs. 6-8.
Calanus patagoniensis Giesbrecht, 1892: p.
91, pI. 6 figs. 8, 10, 17, pI. 8 fig. 29.
Body length -
females: 2.08-2.37mm (10 specimens)
males: 2.02-2.41 mm (11 specimens)
F~male. Body slender and elongated. Long
bIfid rostrum. Postero-Iateral margins of last
thoracic somite somewhat elongated.
Proportional lengths of cephalothorax and
abdomen 76: 24; proportional lengths of
abdominal somites and furca 33: 16: 14: 16: 21
= 100. In lateral view, genital somite bears
wide, flap-like structure that almost completely coyers genital aperture. This plate
observed m an upright position or folded
over the genital pores. Often, mucous secretions visible in the gonopore area. P5 B1
lacks de.nt~culation along inner margin
charactenstic of Calanus species. Endopod of
P5 with 6 setae.
Male. Same body shape as female but with
more elongated and slender abdomen.
Proportional lengths of cephalothorax and
Family Calanidae
abdomen 72: 28; proportional lengths of
abdominal so mites and furca 15: 25 : 17: 14 :
14: 15 = 100. P5 asymmetrical, very long and
slender, extending beyond abdomen. B1 with
naked.inner border. Left P5longer than right
~~d wIth reduced, one-joint~d endopod; last
Jomt of exopod ornated with thick tufts
of hairs. Right P5 with longer 3-jointed
endopod. Exopods of left and right P5 ending
with long spine-like seta.
Distribution
This antiboreal species has also been reported
for the Arabian Sea by Sewell (1947). Farran
(1929) .recorded its occurrence in the tropical
AtlantIc Ocean, off Rio de Janeiro. It has
been frequently sampled off the west coast of
South America (Brady 1883) and inshore off
the Chilean coast in sub-Antarctic waters
(Fa~etti 1962; Bjornberg 1973; Arcos 1975;
Mann and Antezana 1985; Hirakawa 1989).
~rcos (1974) recorded it as frequent
In September-October in the Straits of
Magellan, whereas Mazzocchi and Ianora
(1991) reported low abundances for this
species in November when the species was
present mainly at the three most Pacific stations. Very little is known about the vertical
distribution of this species. In the present
study, C. patagoniensis was frequently
sampled in subsurface waters throughout the
Straits of Magellan.