Data from: Anchors and snorkels: heterochrony, development and form in functionally-constrained fossil crassatellid bivalves

Katie S. Collins, James S. Crampton, Helen L. Neil, Euan G. C. Smith, Michael F. Gazley & Michael Hannah
New growth-rate estimates for nine species from three genera of New Zealand Crassatellidae (Mollusca; Bivalvia), combined with existing morphometric ontogenetic descriptions, allow identification of heterochronic processes in the evolution of these genera. Both paedomorphosis (progenesis and neoteny) and peramorphosis (hypermorphosis and acceleration) have occurred within the clade. Overall, morphological variability and response to environmental pressure in this non-siphonate group is restricted by the interplay of anatomical and life-habit constraints. Stability in the substrate, predator avoidance,...
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