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The family Calyptraeidae is widely distributed around the world and shows several types of development all with physical care. Adults and broods of Trochita pileus from sub-Antarctic waters were collected during two cruises off Tierra del Fuego and Burdwood Bank at depths between 39 and 298 m. A total of 43 brooding females and 314 egg capsules of T. pileus were collected. Shell diameter of brooding...
Isometra vivipara Mortensen, 1917, which was described one hundred years ago, represents a particular case within the feather stars of the southwestern Atlantic Ocean. This is a dioecious species in which the oocytes are fertilized in the ovary and not externally as in other species. Some authors have pointed out that I. vivipara stores spermatozoa in the genital pinnules of the female, although there...
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