Specimen image via iDigBio · CC0
Holasteroida
Sign in to saveHolasteroida is an order of irregular sea urchins.
Species
ブンブクモドキ目
ORDER
- KingdomAnimalia
- PhylumEchinodermata
- ClassEchinoidea
- OrderHolasteroida
via GBIF
Museum specimens
- Specimen records
- 9
- With media
- 14
- Collections
- KU, CAS, USNM
- Recorded in
- United Kingdom, United States, Germany, Denmark
~2 min read
Encyclopedic overview
3 sectionsContents
- Characteristics
- List of families
- References
Holasteroida is an order of irregular sea urchins.
== Characteristics == thumb|upright=1.1|Ceratophysa ceratopyga by A. Agassiz (1881) These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary abyssal groups such as Pourtalesiidae, some species are even bottle-shaped. The mouth (peristome) does not contain an Aristotle's lantern. The anus (periproct) has migrated towards the periphery of the test. The plastron is never amphisternous.
Excerpted from Wikipedia’s “Holasteroida” article, available under the CC BY-SA 4.0 licence.