Coleoidea
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Coleoidea or Dibranchiata is one of the two subclasses of cephalopod molluscs containing all the various taxa popularly thought of as "soft-bodied" or "shell-less" (i.e. octopus, squid and cuttlefish). Unlike its sister groups, the shelled Ammonoidea and Nautiloidea, the coleoids have at most an internal shell called cuttlebone or gladius that is used for buoyancy or as muscle attachment. Some species, notably the incirrate octopuses (including commonly known varieties living in the shallows), have lost their internal shell altogether, while in some it has been replaced by a chitinous support
OverviewAI-generated
Coleoidea is a subclass within the class Cephalopoda of the phylum Mollusca. The taxon was described by Bather in 1888 and is currently accepted. It is also referred to by the common name coleoids or Tintenfische.
The group inhabits marine environments. One record associated with this taxon is held by the institution CMN and is linked to Papua New Guinea.
Synthesized by Vinony from 20 facts across 4 sources: Wikidata, WoRMS, iDigBio, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.
Species
coleoids
Subclass
- PhylumMollusca
- ClassCephalopoda
蛸亞綱（學名：Coleoidea）是頭足綱下的一類軟體動物。它們不像鸚鵡螺亞綱般有硬殼，最多只有用來控制浮沉的內骨。一些物種甚至完全沒有骨頭，一些則以軟骨來支撐。 蛸亞綱的分類是以觸手的數量及結構來定界的。已滅絕及最原始的箭石下綱相信是有10隻觸手。較現代的物種其中一對觸手可能已經進化或退化了。十腕總目的第四對手臂進化成為有吸盤的長觸手。八腕總目的第二對手臂有不同的改變：幽靈蛸目演化成感應絲狀物；八腕目則完全退化。
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Encyclopedic overview
7 sectionsContents
- Etymology
- Evolution
- Classification
- Reproduction
- Paralarva
- References
- External links
Coleoidea or Dibranchiata is one of the two subclasses of cephalopod molluscs containing all the various taxa popularly thought of as "soft-bodied" or "shell-less" (i.e. octopus, squid and cuttlefish). Unlike its sister groups, the shelled Ammonoidea and Nautiloidea, the coleoids have at most an internal shell called cuttlebone or gladius that is used for buoyancy or as muscle attachment. Some species, notably the incirrate octopuses (including commonly known varieties living in the shallows), have lost their internal shell altogether, while in some it has been replaced by a chitinous support structure.
==Etymology== Coleoidea comes from the greek word koleos. The term Dibranchiata comes from the Greek words “di,” meaning “two,” and “branchion,” which comes from “branchia,” meaning “gill.”
Excerpted from Wikipedia’s “Coleoidea” article, available under the CC BY-SA 4.0 licence.