Opisthobranchia


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Related to Opisthobranchia: Pulmonata
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Noun1.Opisthobranchia - gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
class Gasteropoda, class Gastropoda, Gasteropoda, Gastropoda - snails and slugs and their relatives
Nudibranchia, order Nudibranchia - comprising numerous marine gastropod mollusks lacking a shell in the adult state and usually having a body like a slug
class - (biology) a taxonomic group containing one or more orders
References in periodicals archive ?
N X S X Anthozoa Ptilosarcus gumeyi N X (Sea Pen) S X Metridium farcimen O X X (White Plume Anemone) Mollusca Gastropoda Subclass: N X Opisthobranchia S X X (nudibranch) O X Nassarius mendicus N X X (snail) S O Aplysia spp.
0 0 0 0 0 Conus semottorum 0 0 0 0 0 Hexaplex fulvescens 0 0 0 1 0 Hydatina vesicaria 1 0 0 0 0 Mitrella argus 0 0 0 0 0 Phalium granulatum 0 0 0 0 0 Polystira albida 2 0 0 0 0 Thais haemastoma 1 0 0 0 0 Tonna maculosa 3 0 1 0 0 Xenophora conchyliophora CEPHALOPODA 0 1 2 2 1 +Loligo pealeii 1 0 1 3 1 Loliguncula brevis 0 1 0 0 0 Octopus hummelincki OPISTHOBRANCHIA 1 0 0 0 0 Aplysia willcoxi POLYPLACOPHORA 0 0 0 0 0 Stenoplax floridana ECHINODERMATA ASTEROIDEA 1 1 1 0 1 +Astropecten sp.
Origins and relationships of primitive members of the Opisthobranchia.
Heterobranchia is one of the main clades of gastropods, containing the largest number of species, which includes Pulmonata, Opisthobranchia and the Lower Heterobranchia (Bouchet & Rocroi, 2005).
The Valvatoidea represent the earliest clade of the Heterobranchia (Allogastropoda, Opisthobranchia and Pulmonata).
Direct development in a nudibranch Cadlina laevis with a discussion on developmental processes in the Opisthobranchia.