3.31 Paraeuchaeta antarctica Giesbrecht
1902
Euchaeta antarctica Giesbrecht, 1902: p. 21,
pI. 3 figs. 1-8 - Wolfenden, 1908: p. 18, pI. 4
figs. 5, 6-Bradford, 1971b: p. 21, figs. 64-67
- Ramirez and Dinofrio, 1976: p. 7, pI. 2a fig.
3 - Park, 1978: p. 220, figs. 77, 78 - Ferrari
and Dojiri, 1987: p. 458, figs. 1-7 - Fontaine,
1988: p. 32, figs. 3-8.
Pareuchaeta antarctica Farran, 1929: p. 238.
Paraeuchaeta antarctica Bradford, 1981: p.
391, figs. lA, 5 - Bradford et aI., 1983: p. 25,
fig. 10.
Body length -
females: 6.51-7.53 mm (20 specimens)
males: 5.14-5.53mm (20 specimens)
Fem~e. Large copepod, easily recognized
by Its very characteristic genital somite
in lateral view. Proportional lengths of
cephalothorax and abdomen 72 : 28 with
cephalothorax 2.7 times longer than wide.
Postero-Iateral corners of last thoracic somite
rounded and extending posteriorly, bearing
tuft of long hairs. Proportional lengths of
abdominal somites and furca 40: 26 : 25 : 9 =
10 senes of medIan folds (see Fontaine 1988 for
detailed description). 2nd and 3rd abdominal
somites covered with short bristles forming
characteristic checkerboard pattern on dorsal
and lateral surfaces, with long hairs on
ventral surface. Posterior margins of
abdominal somites 2-3 bordered by row of
triangular flaps.
Family Euchaetidae·
Male. Same body shape as female with
proportional lengths of cephalothorax and
abdomen 71: 29. Postero-Iateral corners of
last thoracic somite elongated and extending
about 112 length of first abdominal somite.
Proportional lengths of abdominal somite
and furca 14: 32: 25: 21: 8 ~- 100. Abdominal
somite naked with posterior margins bordered
by fringe of "shark-like" teeth. Caudal rami
v~ry reduced. P5 with asymmetrical basipods,
nght one much shorter and stouter than left.
Endopod of right leg bearing lobe-like proc~ss on external margin at 2/3 length. Re2 of
nght leg shorter than ReI and with enlarged
flat end. Left P5 3-jointed; serrated lamella
on. distal part of Re2 scoop-shaped, with
umform small teeth along entire internal
margin and minute teeth along distal part of
external margin. Digitiform process of Re2
short, ear-shaped. Re3 longer than serrated
lamella, with long spinules on distal end·
conical process at base of Re3 with long hair~
at base and tapering into sharp point.
Remarks
Some ~axonomists consider the family
Euchaetldae to be monogeneric (Vervoort
1957; Park 1978; Fontaine 1988) while
others include both genera Eucha~ta and
Paraeuchaeta (Heptner 1971; Bradford 1974;
Bradford et al. 1983; Razouls 1993). The
separation of the two genera Euchaeta and
Paraeuchaeta was first proposed by Scott
(1909) on the basis of the structure of the
apical setae of the maxillae of the females
and of the left exopod in the male P5.
1902
Euchaeta antarctica Giesbrecht, 1902: p. 21,
pI. 3 figs. 1-8 - Wolfenden, 1908: p. 18, pI. 4
figs. 5, 6-Bradford, 1971b: p. 21, figs. 64-67
- Ramirez and Dinofrio, 1976: p. 7, pI. 2a fig.
3 - Park, 1978: p. 220, figs. 77, 78 - Ferrari
and Dojiri, 1987: p. 458, figs. 1-7 - Fontaine,
1988: p. 32, figs. 3-8.
Pareuchaeta antarctica Farran, 1929: p. 238.
Paraeuchaeta antarctica Bradford, 1981: p.
391, figs. lA, 5 - Bradford et aI., 1983: p. 25,
fig. 10.
Body length -
females: 6.51-7.53 mm (20 specimens)
males: 5.14-5.53mm (20 specimens)
Fem~e. Large copepod, easily recognized
by Its very characteristic genital somite
in lateral view. Proportional lengths of
cephalothorax and abdomen 72 : 28 with
cephalothorax 2.7 times longer than wide.
Postero-Iateral corners of last thoracic somite
rounded and extending posteriorly, bearing
tuft of long hairs. Proportional lengths of
abdominal somites and furca 40: 26 : 25 : 9 =
10 senes of medIan folds (see Fontaine 1988 for
detailed description). 2nd and 3rd abdominal
somites covered with short bristles forming
characteristic checkerboard pattern on dorsal
and lateral surfaces, with long hairs on
ventral surface. Posterior margins of
abdominal somites 2-3 bordered by row of
triangular flaps.
Family Euchaetidae·
Male. Same body shape as female with
proportional lengths of cephalothorax and
abdomen 71: 29. Postero-Iateral corners of
last thoracic somite elongated and extending
about 112 length of first abdominal somite.
Proportional lengths of abdominal somite
and furca 14: 32: 25: 21: 8 ~- 100. Abdominal
somite naked with posterior margins bordered
by fringe of "shark-like" teeth. Caudal rami
v~ry reduced. P5 with asymmetrical basipods,
nght one much shorter and stouter than left.
Endopod of right leg bearing lobe-like proc~ss on external margin at 2/3 length. Re2 of
nght leg shorter than ReI and with enlarged
flat end. Left P5 3-jointed; serrated lamella
on. distal part of Re2 scoop-shaped, with
umform small teeth along entire internal
margin and minute teeth along distal part of
external margin. Digitiform process of Re2
short, ear-shaped. Re3 longer than serrated
lamella, with long spinules on distal end·
conical process at base of Re3 with long hair~
at base and tapering into sharp point.
Remarks
Some ~axonomists consider the family
Euchaetldae to be monogeneric (Vervoort
1957; Park 1978; Fontaine 1988) while
others include both genera Eucha~ta and
Paraeuchaeta (Heptner 1971; Bradford 1974;
Bradford et al. 1983; Razouls 1993). The
separation of the two genera Euchaeta and
Paraeuchaeta was first proposed by Scott
(1909) on the basis of the structure of the
apical setae of the maxillae of the females
and of the left exopod in the male P5.