3.17 Paracalanus parvus Claus 1863
Calanus parvus Claus, 1863: p. 173, pI. 26
figs. 10-14, pI. 27 figs. 1-4.
Paracalanus parvus Giesbrecht, 1892: p. 48,
165, pI. 1 fig. 5, pI. 6 figs. 28-30, pI. 9 figs. 5,
9, 11, 17, 23, 25, 27, 31-34 - Sars, 1903: p.
17, pIs. 8, 9 - Brodskii, 1948: p. 41, pI. 7 figs.
9, 10, pI. 8 figs. 1-6; 1950: p. 108, fig. 33 -
Farran and Vervoort, 1951a: p. 3, fig. 1 -
Marques, 1959: p. 208, pI. 1 fig. d - Vervoort,
1962: p. 394, figs. 1,2 - Ramirez, 1966: p. 9,
pI. 4 figs. 13-19 - Vidal, 1968: p. 22, pI. 5
figs. 10-14 - Bowman, 1971: p. 28, fig. 23bP - Arcos, 1975: p. 12, pI. 3 figs. 17-21.
Body length -
females: 1.02-1.18mm (10 specimens)
males: 1.08mm (2 specimens)
Female. Body stout with wide, smoothly
rounded head.' Cephalothorax 2.6 times
longer than wide. Rostrum with two short
til.aments. Al not reaching caudal rami, with
shghtly thickened base. Proportional lengths
of cephalothorax and abdomen 73 : 27;
proportional lengths of abdominal somites
and furca 27: 17: 14:24: 18 = 100. P2-P4 Bl
wi~h very variable ornamentation (spines,
spmules and hairs). P2-P4 Ri2 with numerous
spines. P2, P3 Re2 with a clutch of 2-3
spines. These spines are absent in P4. P2-P4
Re3 with serrated external margin but
smooth outer distal edge. P5 small, symmetrical, uniramous and 2-jointed. Terminal
joint long with two spines, inner one almost 3
times longer than other and with marked
serrated margin.
Family Paracalanidae
Male. Body shape similar to female.
Cephalothorax 2.4 times longer than wide.
Al with very thick base. Proportional lengths
of cephalothorax and abdomen 68: 32;
proportional lengths of abdominal somites
and furca 9:25:19:17:16:14 = 100. P5
~srmmetrical and uniramous. Right leg 2Jomted and left 5-jointed. Both terminal
joints of left and right P5 with 2 short spines·
in right joint one spine much shorter tha~
other, in left joint one spine about half the
length of the other. This latter joint bears a
longitudinal row of fine hairs.
Remarks
Some authors have observed a very small
spine on the margin of the long spine of the
terminal joint of the female P5 (Giesbrecht
1892; Sars 1903). This spine was absent in our
females, as also reported by other authors
(Brodskii 1950; Farran and Vervoort 1951a·
Vervoort 1962; Bowman 1971).
'
Distribution
P: parv.us i.s a ~eritic species with a remarkably
~lde dlstnbutlOn. Though plentiful inshore,
It can also occur in surface oceanic waters.
Rose (1933) and Wilson (1932) describe its
wide occurrence, extending to all three major
oceans, the Mediterranean and Black Seas
and including warm as well as temperate
waters under greatly varying ecological conditions. Most authors report that it does not
occur at very high latitudes either in the
Northern or Southern hemispheres; but it has
been recorded as plentiful inshore for the
Chilean coast by Arcos (1975), Marin and
Antezana (1985) and Peterson et ai. (1988),
Calanus parvus Claus, 1863: p. 173, pI. 26
figs. 10-14, pI. 27 figs. 1-4.
Paracalanus parvus Giesbrecht, 1892: p. 48,
165, pI. 1 fig. 5, pI. 6 figs. 28-30, pI. 9 figs. 5,
9, 11, 17, 23, 25, 27, 31-34 - Sars, 1903: p.
17, pIs. 8, 9 - Brodskii, 1948: p. 41, pI. 7 figs.
9, 10, pI. 8 figs. 1-6; 1950: p. 108, fig. 33 -
Farran and Vervoort, 1951a: p. 3, fig. 1 -
Marques, 1959: p. 208, pI. 1 fig. d - Vervoort,
1962: p. 394, figs. 1,2 - Ramirez, 1966: p. 9,
pI. 4 figs. 13-19 - Vidal, 1968: p. 22, pI. 5
figs. 10-14 - Bowman, 1971: p. 28, fig. 23bP - Arcos, 1975: p. 12, pI. 3 figs. 17-21.
Body length -
females: 1.02-1.18mm (10 specimens)
males: 1.08mm (2 specimens)
Female. Body stout with wide, smoothly
rounded head.' Cephalothorax 2.6 times
longer than wide. Rostrum with two short
til.aments. Al not reaching caudal rami, with
shghtly thickened base. Proportional lengths
of cephalothorax and abdomen 73 : 27;
proportional lengths of abdominal somites
and furca 27: 17: 14:24: 18 = 100. P2-P4 Bl
wi~h very variable ornamentation (spines,
spmules and hairs). P2-P4 Ri2 with numerous
spines. P2, P3 Re2 with a clutch of 2-3
spines. These spines are absent in P4. P2-P4
Re3 with serrated external margin but
smooth outer distal edge. P5 small, symmetrical, uniramous and 2-jointed. Terminal
joint long with two spines, inner one almost 3
times longer than other and with marked
serrated margin.
Family Paracalanidae
Male. Body shape similar to female.
Cephalothorax 2.4 times longer than wide.
Al with very thick base. Proportional lengths
of cephalothorax and abdomen 68: 32;
proportional lengths of abdominal somites
and furca 9:25:19:17:16:14 = 100. P5
~srmmetrical and uniramous. Right leg 2Jomted and left 5-jointed. Both terminal
joints of left and right P5 with 2 short spines·
in right joint one spine much shorter tha~
other, in left joint one spine about half the
length of the other. This latter joint bears a
longitudinal row of fine hairs.
Remarks
Some authors have observed a very small
spine on the margin of the long spine of the
terminal joint of the female P5 (Giesbrecht
1892; Sars 1903). This spine was absent in our
females, as also reported by other authors
(Brodskii 1950; Farran and Vervoort 1951a·
Vervoort 1962; Bowman 1971).
'
Distribution
P: parv.us i.s a ~eritic species with a remarkably
~lde dlstnbutlOn. Though plentiful inshore,
It can also occur in surface oceanic waters.
Rose (1933) and Wilson (1932) describe its
wide occurrence, extending to all three major
oceans, the Mediterranean and Black Seas
and including warm as well as temperate
waters under greatly varying ecological conditions. Most authors report that it does not
occur at very high latitudes either in the
Northern or Southern hemispheres; but it has
been recorded as plentiful inshore for the
Chilean coast by Arcos (1975), Marin and
Antezana (1985) and Peterson et ai. (1988),