Siphonariid development: Quintessential euthyneuran larva with a mantle fold innovation (Gastropoda; Panpulmonata)

Journal of Morphology
Louise R PageStephen C Kempf

Abstract

Recent phylogenetic revisions of euthyneuran gastropods ("opisthobranchs" and "pulmonates") suggest that clades with a planktotrophic larva, the ancestral life history for euthyneurans, are more widely distributed along the trunk of the euthyneuran tree than previously realized. There is some indication that the planktotrophic larva of euthyneurans has distinctive features, but information to date has come mainly from traditional "opisthobranch" groups. Much less is known about planktotrophic "pulmonate" larvae. If planktotrophic larvae of "pulmonates" share unique traits with those of "opisthobranchs," then a distinctive euthyneuran larval-type has been the developmental starting template for a spectacular amount of evolved morphological and ecological disparity among adult euthyneurans. We studied development of a siphonariid by preparing sections of larval and postmetamorphic stages for histological and ultrastructural analysis, together with 3D reconstructions and data from immunolabeling of the larval apical sensory organ. We also sought a developmental explanation for the unusual arrangement of shell-attached, dorso-ventral muscles relative to the mantle cavity of adult siphonariids. Adult siphonariids ("false limpets") h...Continue Reading

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Citations

Sep 4, 2019·Cell and Tissue Research·Alexandre Lobo-da-Cunha

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