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 Oxynoe olivacea, a Mediterranean sacoglossan in the family Oxynoidae
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Boselliidae |
Sacoglossa, commonly known as the sacoglossans, are a taxonomic order of small bubble snails, sea snails and sea slugs, marine opisthobranch gastropod mollusks in the superorder Heterobranchia. Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 The class Gastropoda or the gastropods, also previously known as gasteropods, or univalves, and more commonly known as Snails Orthogastropoda is one of two major Taxonomic groupings of snails and slugs an extremely large Subclass within the huge class Gastropoda. Heterobranchia, the heterobranchs, (meaning "different-gilled snails" is a Taxonomic Superorder of sea Snails marine An opisthobranch (ō-pĭsʹthə-brăngk is any member of the very large and diverse group of rather specialized highly evolved marine slugs and snails ( marine Gastropod Family denotes a group of People affiliated by consanguinity affinity or co-residence Elysiidae is a family of Gastropod sea slugs resembling Nudibranchs They are members of the Suborder Sacoglossa in the order Stiligeridae is a Taxonomic family of small to minute Sacoglossan sea Slugs These are marine Opisthobranch Gastropod Stiligeridae is a Taxonomic family of small to minute Sacoglossan sea Slugs These are marine Opisthobranch Gastropod Taxonomy is the practice and science of classification The word comes from the Greek, taxis (meaning 'order' 'arrangement' and, nomos This article is about the taxonomic rank for the sequence of species in a taxonomic list see Taxonomic order In scientific classification used The word snail is a Common name that can be used for almost all members of the Molluscan class Gastropoda which have coiled shells in the The word snail is a Common name that can be used for almost all members of the Molluscan class Gastropoda which have coiled shells in the Slug is a common non-scientific word which is often applied to any Gastropod mollusk whatsoever that has a very reduced shell a small internal shell Marine is an Umbrella term. As an adjective it is usually applicable to things relating to the Sea or Ocean, such as Marine biology, Marine An opisthobranch (ō-pĭsʹthə-brăngk is any member of the very large and diverse group of rather specialized highly evolved marine slugs and snails ( marine Gastropod The class Gastropoda or the gastropods, also previously known as gasteropods, or univalves, and more commonly known as Snails Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 Heterobranchia, the heterobranchs, (meaning "different-gilled snails" is a Taxonomic Superorder of sea Snails marine
In the taxonomy of Bouchet & Rocroi (2005), the clade Sacoglossa is arranged as follows:
- Subclade Oxynoacea
- Superfamily Oxynooidea : family Oxynoidae, family Juliidae, family Volvatellidae
- Subclade Placobranchacea
- Superfamily Placobranchoidea : family Placobranchidae : family Boselliidae, family Platyhedylidae,
- Superfamily Limapontioidea : family Limapontiidae, family Caliphyllidae, family Hermaeidae
In this new taxonomy the family Elysiidae Forbes & Hanley, 1851 is considered a synonym of the family Placobranchidae Gray, 1840 and the families Oleidae O'Donoghue, 1926 and Stiligeridae Iredale & O'Donoghue, 1923 synonyms of the family Limapontiidae Gray, 1847
The sacoglossan families Volvatellidae and Oxynoidae are shelled, and the shells somewhat resemble those of the small bubble snails of the order Cephalaspidea. The new Gastropod Taxonomy of Bouchet & Rocroi (2005 (in collaboration with J A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor The suborder Cephalaspidea, also known as the headshield slugs and bubble shells, is a Suborder of sea slugs and bubble snails marine
The sacoglossan family Juliidae are extraordinary in that they are shelled, bivalved, gastropods. They have a shell in two pieces which superficially resemble the valves of a minute clam. The living members of this family had never been noticed until recent years, and had previously only been known to science as fossil shells. The fossil shells were thought to be remains of a somewhat unusual bivalve mollusk, not a gastropod at all.
All the sacoglossans other than the Volvatellidae, Oxynoidae and Juliidae are shell-less, and as a result are called sea slugs. Even though some of them are highly colored and attractive, such as some species within the family Elysiidae, these are not nudibranchs, which belong to a different order. A nudibranch (pronounced (BrE or (AmE is a member of one Suborder of soft-bodied shell-less marine Opisthobranch Gastropod Mollusks
Many sacoglossans are green in color, and this is because they sequester, and utilize within their own tissues, living chloroplasts from the algae they eat, a very unusual phenomenon known as kleptoplasty. Chloroplasts are Organelles found in Plant cells and eukaryotic Algae that conduct Photosynthesis. Kleptoplasty is a phenomenon whereby Plastids from Algae are sequestered by a host organism This earns them the title of the "solar-powered sea slugs", and makes them unique among animals.
References
- Bouchet, P. & Rocroi, J. -P. (2005). "Classification and Nomenclator of Gastropod Families". Malacologia 47 (1-2): 1-397.
External links
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