UBC Theses and Dissertations
A study of vitamin B₁₂ in some marine invertebrates Maxwell, Brian Edward
Quantitative estimation of the amounts of vitamin B₁₂-active substances in some marine invertebrates was made using a microbiological assay technique. In general, species from phylum Mollusca were found to be richer in content of vitamin B₁₂-active substances than are species from phyla Echinodermata and Annelida and class Crustacea. No definite relationship was found to exist between the content of vitamin B₁₂-active substances in an animal and its phylogeny. Evidence contradictory to classical theory is adduced concerning the phylogenetic relationships among echinoderms. Data are presented which furnish support to existing belief that parapodia of Aphrodite aid in gas exchange or respiration. The substances in some marine invertebrates are discussed. Discussed also are various suggested roles of vitamin B₁₂ in the metabolism of marine invertebrates.
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