100
R. K. DELL
countered, elements of the Antarctic molluscan fauna. Examples of
some of these bathymetric ranges are :
Silicula rouchi (166836 m)
PropeZeda longicaudata ( 6 P 1 080 m)
Yoldia (Aequiyoldia) eightsi (5-728 m)
Limopsis marionensis ( 1 4 6 9 14 m)
Philobrya subZaevis (8-860 m)
Adacnurca nitens (8-1 080 m)
Lissarca notorcadensis (1 8-720 m)
Adamussium colbecki ( P 1 335 m)
Cyamiocardium denticulatum (23-757 m)
Limatula hodgsoni (12-695 m)
Cyclocardia astartoides (15-836 m)
Thracia meridionalis (5-752 m)
Cadulus dalli antarctica (43-836 m)
Margarella refulgens (Smith) (1-720 m)
Lepeta coppingeri (18-860 m)
Trichoconcha mirabilis Smith (122-900 m)
Trophon longstafl Smith (15-720 m)
Toledonia hedleyi Powell (45-640 m)
7. Temperature tolerances of some Antarctic Mollusca
Some years ago the writer determined the ranges of bottom temperatures at which some Antarctic molluscs were obviously able t o live.
Based mainly upon collections from stations established by the Discovery Investigations, and using the associated hydrographic station
data. These ranges cannot be taken to be complete but they do span
the extremes of the known ranges in most cases. Only a few of these
figures have been published previously (Dell, 1968). As might be expected some of the species which, although they are widespread in
Antarctic waters, also extend widely into the Subantarctic, and in some
cases into the cold temperate of southern South America, show wide
temperature tolerances, e.g. :
Lepidopleurus kerguelensis ( -0.42-8.30"C) ;
Dentalium (Fissidentalium) majorinum ( -0-56-6.19°c) ;
Yoldia (Aequiyoldia) eightsi ( -O.5O-7.6O0C) ;
Limopsis marionensis ( -0~56-6~10"C) ;
Cyamiocardium denticulatum (- 1.90-8-1 8OC) ;
Cyamiomactra laminifera (Lamyj ( -0.24-5-14"C) ;
Thrucia meridionalis (- 1.90-5-34"C).
R. K. DELL
countered, elements of the Antarctic molluscan fauna. Examples of
some of these bathymetric ranges are :
Silicula rouchi (166836 m)
PropeZeda longicaudata ( 6 P 1 080 m)
Yoldia (Aequiyoldia) eightsi (5-728 m)
Limopsis marionensis ( 1 4 6 9 14 m)
Philobrya subZaevis (8-860 m)
Adacnurca nitens (8-1 080 m)
Lissarca notorcadensis (1 8-720 m)
Adamussium colbecki ( P 1 335 m)
Cyamiocardium denticulatum (23-757 m)
Limatula hodgsoni (12-695 m)
Cyclocardia astartoides (15-836 m)
Thracia meridionalis (5-752 m)
Cadulus dalli antarctica (43-836 m)
Margarella refulgens (Smith) (1-720 m)
Lepeta coppingeri (18-860 m)
Trichoconcha mirabilis Smith (122-900 m)
Trophon longstafl Smith (15-720 m)
Toledonia hedleyi Powell (45-640 m)
7. Temperature tolerances of some Antarctic Mollusca
Some years ago the writer determined the ranges of bottom temperatures at which some Antarctic molluscs were obviously able t o live.
Based mainly upon collections from stations established by the Discovery Investigations, and using the associated hydrographic station
data. These ranges cannot be taken to be complete but they do span
the extremes of the known ranges in most cases. Only a few of these
figures have been published previously (Dell, 1968). As might be expected some of the species which, although they are widespread in
Antarctic waters, also extend widely into the Subantarctic, and in some
cases into the cold temperate of southern South America, show wide
temperature tolerances, e.g. :
Lepidopleurus kerguelensis ( -0.42-8.30"C) ;
Dentalium (Fissidentalium) majorinum ( -0-56-6.19°c) ;
Yoldia (Aequiyoldia) eightsi ( -O.5O-7.6O0C) ;
Limopsis marionensis ( -0~56-6~10"C) ;
Cyamiocardium denticulatum (- 1.90-8-1 8OC) ;
Cyamiomactra laminifera (Lamyj ( -0.24-5-14"C) ;
Thrucia meridionalis (- 1.90-5-34"C).