| Septemchitonidae | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Polyplacophora |
| Order: | † Paleoloricata |
| Suborder: | † Septemchitonina |
| Family: | † Septemchitonidae Bergenhayn, 1955 |
| Genera | |
| |
Septemchitonidae is an extinct family of chitons (Polyplacophora) known from Europe and North America. [1] Morphologically, the clade is defined by rectangular plates, [2] and the upside-down V-shape of species' valves when viewed in cross-section. [3]
Chitons are marine molluscs of varying size in the class Polyplacophora, formerly known as Amphineura. About 940 extant and 430 fossil species are recognized.
Monoplacophora, meaning "bearing one plate", is a polyphyletic superclass of molluscs with a cap-like shell inhabiting deep sea environments. Extant representatives were not recognized as such until 1952; previously they were known only from the fossil record, and were thought to have become extinct 375 million years ago.
Lepidopleurus is an extant genus of chitons in the family Leptochitonidae.
Ischnochiton luteoroseus is a minute species of chiton in the family Ischnochitonidae.
Sypharochiton pelliserpentis is a species of chiton in the family Chitonidae. As the species name suggests, the surface of the girdle in this chiton has a pattern of overlaying scales resembling snakeskin, and it is commonly referred to as the snakeskin chiton. The Māori name for the species is papatua.
Onithochiton neglectus neglectus is a subspecies of chiton in the family Chitonidae.
Tonicella is a genus of chitons known as the lined chitons.
Chiton magnificus, the liquorice sea cradle, is a Southeast Pacific species of edible chiton, a marine polyplacophoran mollusk in the family Chitonidae, the typical chitons.
Acanthopleura granulata, common name the West Indian fuzzy chiton, is a medium-sized tropical species of chiton. This type of chiton's activity does not depend on spring-neap oscillations leading to lower locomotion loss. Its morphology is different from usual chitons as it has a fifth valve, which is split into halves.
Chitonida is an order of chitons. The order was erected to class chitons with elaborate hull outgrowths on their eggs.
Acanthochitonidae is a family of marine mollusks belonging to the class Polyplacophora, commonly known as chitons. Species are widely distributed throughout the world's oceans, but are most commonly found in the shallow waters of the Pacific Ocean, from Alaska to Chile.
Craspedochiton elegans is a chiton species in the genus Craspedochiton.
The Paleoloricata are valved polyplacophora without sutural laminae or insertion plates. The "order" probably represents a paraphyletic grouping.
Chitonina is a suborder of polyplacophoran mollusc belonging to the order Chitonida.
Hanleya is a genus of polyplacophoran molluscs known from Oligocene and Miocene fossils; it is represented today by a number of species including H. sinica Xu 1990 (China), H. brachyplax (Brazil) and H. hanleyi Bean in Thorpe, 1844 (Chile), which feeds on sponges.
Acutichiton is among the most primitive genera of Neoloricate chitons. Acutichiton became extinct during the Carboniferous period. Articulated specimens are known.
Placiphorella, the veiled chiton, is a genus of polyplacophoran molluscs with precephalic tentacles, which are used in feeding.
Lepidochitona is a genus of chitons. It has been included in the families Tonicellidae, Ischnochitonidae, and Lepidochitonidae.
Tectibranchia Cuvier, 1814, also spelled as Tectibranchiata, was previously used as a taxonomic order, or suborder, of gastropods in which the gills are usually situated on one side of the back, and protected by a fold of the mantle. When there is a shell, it is usually thin and delicate and often rudimentary.
Acanthopleura echinata is a Southeast Pacific species of edible chiton, a marine polyplacophoran mollusc in the family Chitonidae, the typical chitons.