Rhipidaster Sladen, 1889
publication ID |
https://doi.org/ 10.11646/zootaxa.4750.1.4 |
publication LSID |
lsid:zoobank.org:pub:CF37CEA8-E156-48A6-8A28-C94A294A75DF |
DOI |
https://doi.org/10.5281/zenodo.3706289 |
persistent identifier |
https://treatment.plazi.org/id/03DC87AB-FFD5-022F-17E8-1CCCFB12921C |
treatment provided by |
Plazi |
scientific name |
Rhipidaster Sladen, 1889 |
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Rhipidaster Sladen, 1889 View in CoL
Rhipidaster Sladen, 1889: 447 View in CoL .
Rhipidaster (Xenorias) Fisher, 1913: 222 .
Xenorias Fisher, 1919: 451 View in CoL .
Comments. It is argued herein that Xenorias Fisher, 1913 is a junior synonym of Rhipidaster Sladen, 1889 . Fisher (1913, 1919) differentiated Xenorias from Rhipidaster based on the position of the marginal plates, which he argued formed oblique rather than parallel chevrons (in Rhipidaster ) with one another, touching by the inter marginal ends along the side of the ray. Re-examination of these plates on dry specimens showed that the superomarginal and inferomarginal plates were in contact with articulated ends intermarginally permitting flexure. Thus, both parallel and oblique marginal plate arrangements are possible, in many cases on the same arm of a single individual.
Although Rhipidaster was not included in the most phylogenetic revision of the Valvatacea ( Mah & Foltz 2011), the possession of multiple arms suggests greatest affinity with Solaster or Crossaster ( Fig. 1 View FIGURE 1 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Rhipidaster Sladen, 1889
Mah, Christopher L. & Fujita, Toshihiko 2020 |
Xenorias
Fisher, W. K. 1919: 451 |
Rhipidaster (Xenorias)
Fisher, W. K. 1913: 222 |
Rhipidaster
Sladen, W. P. 1889: 447 |