INVESTIGADORES
DIAZ DE ASTARLOA Juan Martin
artículos
Título:
Chondrichthyan egg cases from the southwest Atlantic
Autor/es:
MABRAGAÑA E.; FIGUEROA, D E; SCENNA, L. B.; DÍAZ DE ASTARLOA, J. M.; COLONELLO, J. H.; DELPIANI, G.
Revista:
JOURNAL OF FISH BIOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2011 vol. 79 p. 1261 - 1290
ISSN:
0022-1112
Resumen:
Egg cases of 21 oviparous chondrichthyan species from the south-west Atlantic Ocean are described
and compared. The catshark Schroederichthys bivius has a cigar-shaped egg case with curled tendrils
only at the posterior end. Egg cases of the elephant fish Callorhinchus callorynchus are spindleshaped
with anterior and posterior tubular extensions and lateral flanges. The skate Amblyraja
doellojuradoi presents medium-sized egg cases (71 mm in length) with a lateral keel extending
to the first portion of the horns. The endemic skate species of the genus Atlantoraja have
medium to large egg cases (69104 mm in length) and present relatively large posterior horns.
Egg cases of the genus Bathyraja have a medium size, 7598 mm in length, and are characterized
by a very similar morphology, a relatively smooth to rough surface case and posterior
horns strongly curved inwards. Egg cases of the genera Dipturus and Zearaja are very large,
115230 mm in length, and have a well-developed posterior apron. Despite the problematical
identification of skates at species level, the egg capsules of the endemic genus Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Schroederichthys bivius has a cigar-shaped egg case with curled tendrils
only at the posterior end. Egg cases of the elephant fish Callorhinchus callorynchus are spindleshaped
with anterior and posterior tubular extensions and lateral flanges. The skate Amblyraja
doellojuradoi presents medium-sized egg cases (71 mm in length) with a lateral keel extending
to the first portion of the horns. The endemic skate species of the genus Atlantoraja have
medium to large egg cases (69104 mm in length) and present relatively large posterior horns.
Egg cases of the genus Bathyraja have a medium size, 7598 mm in length, and are characterized
by a very similar morphology, a relatively smooth to rough surface case and posterior
horns strongly curved inwards. Egg cases of the genera Dipturus and Zearaja are very large,
115230 mm in length, and have a well-developed posterior apron. Despite the problematical
identification of skates at species level, the egg capsules of the endemic genus Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Callorhinchus callorynchus are spindleshaped
with anterior and posterior tubular extensions and lateral flanges. The skate Amblyraja
doellojuradoi presents medium-sized egg cases (71 mm in length) with a lateral keel extending
to the first portion of the horns. The endemic skate species of the genus Atlantoraja have
medium to large egg cases (69104 mm in length) and present relatively large posterior horns.
Egg cases of the genus Bathyraja have a medium size, 7598 mm in length, and are characterized
by a very similar morphology, a relatively smooth to rough surface case and posterior
horns strongly curved inwards. Egg cases of the genera Dipturus and Zearaja are very large,
115230 mm in length, and have a well-developed posterior apron. Despite the problematical
identification of skates at species level, the egg capsules of the endemic genus Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Amblyraja
doellojuradoi presents medium-sized egg cases (71 mm in length) with a lateral keel extending
to the first portion of the horns. The endemic skate species of the genus Atlantoraja have
medium to large egg cases (69104 mm in length) and present relatively large posterior horns.
Egg cases of the genus Bathyraja have a medium size, 7598 mm in length, and are characterized
by a very similar morphology, a relatively smooth to rough surface case and posterior
horns strongly curved inwards. Egg cases of the genera Dipturus and Zearaja are very large,
115230 mm in length, and have a well-developed posterior apron. Despite the problematical
identification of skates at species level, the egg capsules of the endemic genus Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.presents medium-sized egg cases (71 mm in length) with a lateral keel extending
to the first portion of the horns. The endemic skate species of the genus Atlantoraja have
medium to large egg cases (69104 mm in length) and present relatively large posterior horns.
Egg cases of the genus Bathyraja have a medium size, 7598 mm in length, and are characterized
by a very similar morphology, a relatively smooth to rough surface case and posterior
horns strongly curved inwards. Egg cases of the genera Dipturus and Zearaja are very large,
115230 mm in length, and have a well-developed posterior apron. Despite the problematical
identification of skates at species level, the egg capsules of the endemic genus Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Atlantoraja have
medium to large egg cases (69104 mm in length) and present relatively large posterior horns.
Egg cases of the genus Bathyraja have a medium size, 7598 mm in length, and are characterized
by a very similar morphology, a relatively smooth to rough surface case and posterior
horns strongly curved inwards. Egg cases of the genera Dipturus and Zearaja are very large,
115230 mm in length, and have a well-developed posterior apron. Despite the problematical
identification of skates at species level, the egg capsules of the endemic genus Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Bathyraja have a medium size, 7598 mm in length, and are characterized
by a very similar morphology, a relatively smooth to rough surface case and posterior
horns strongly curved inwards. Egg cases of the genera Dipturus and Zearaja are very large,
115230 mm in length, and have a well-developed posterior apron. Despite the problematical
identification of skates at species level, the egg capsules of the endemic genus Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Dipturus and Zearaja are very large,
115230 mm in length, and have a well-developed posterior apron. Despite the problematical
identification of skates at species level, the egg capsules of the endemic genus Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Psammobatis are
easily diagnosed; the capsules are small (2553 mm in length), those of Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Psammobatis rutrum being
the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Rioraja agassizi have a medium size,
6168 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed
in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.Sympterygia are small to medium sized,
5186 mm in length, and display the thickest lateral keel and the longest posterior horns among
the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying
areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is
presented.