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This study examines morphological and biochemical changes that occur as glochidia larvae of the freshwater mussel Utterbackia imbecillis (Say, 1829) metamorphose into juveniles. Metamorphosis encompasses two distinct stages. The first occurs during the first 3-4 days, and involves degeneration of...
Egg masses of two populations of the ascoglossan Costasiella with different developmental modes were examined. Costasiella ocellifera is an encapsulated developer; Costasiella sp. has an obligate plankto-trophic larval stage. Adults of the two populations were also separable by habitat, but could...
Microstructural characterization of Achatina fulica Bowdich, 1822 epiphragms and mucus secretions was performed to address two questions: what are the structure and composition of the reinforcing inorganic phase in the epiphragms, and what enables a durable epiphragm to form quickly in comparison...