Ophiurida
| Ophiurida | ||||||||||||
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Ophiura ophiura |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Ophiurida | ||||||||||||
| Müller & Troschel , 1840 |
The Ophiurida make up most of the living today brittle stars (Ophiuroidea). Your arms are always clearly separated from the body and can usually only be moved to the side, as the joint only allows a limited amount of upward and downward bending. The Ophiurida are divided into numerous families , which are differentiated on the jaw apparatus, protrusions in the mouth area (oral papillae) and the skeleton of the arms.
features
The arms are always unbranched. The muscle openings on the specific structures of the lateral arm plates where the spines are attached (spine articulation) are generally surrounded by ridges and / or rounded elevations and separated from the nerve openings by vertical ridges. The side arm plates are usually ornamented with external tubercles, grooves or projections. In Ophiurida there is strong pedomorphosis .
Way of life
Most species eat organic debris , feces, and algae .
Systematics
Ophiurida is according to O'Hara et al. divided into two subordinates. Most species of the suborder Ophiurida incertae sedis fit morphologically to the family Ophiopyrgidae , in view of the influence of pedomorphosis and the lack of genetic data, O'Hara et al. on including this subordination in the systematics of the Ophiurida .:
- Ophiomusina O'Hara et al. , 2017
- Ophiurina Müller & Troschel , 1840 sensu O'Hara et al. 2017
literature
- Svein A. Fossa / Alf Jacob Nilsen: Coral reef aquarium Volume 6 , Schmettkamp Verlag, 1998, ISBN 3-928819-18-6
Individual evidence
- ↑ a b Timothy D. O'Hara, Sabine Stöhr, Andrew F. Hugall, Ben Thuy, Alexander Martynov: Morphological diagnoses of higher taxa in Ophiuroidea (Echinodermata) in support of a new classification. In: European Journal of Taxonomy 416, 2018, pp. 1–35. ( Online )
