Sphaeriodiscus mirabilis A.M. Clark 1976
publication ID |
https://doi.org/ 10.11646/zootaxa.4539.1.1 |
publication LSID |
lsid:zoobank.org:pub:2C72727B-79C5-407F-BD92-B12F98196800 |
DOI |
https://doi.org/10.5281/zenodo.5990841 |
persistent identifier |
https://treatment.plazi.org/id/193787A0-FFB6-FFCB-F4CB-FC3747C4CD35 |
treatment provided by |
Plazi |
scientific name |
Sphaeriodiscus mirabilis A.M. Clark 1976 |
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Sphaeriodiscus mirabilis A.M. Clark 1976 View in CoL
Figure 33 View FIGURE 33 A–E
A.M. Clark 1976: 248; Mah 2011: 44
Diagnosis. A species of Sphaeriodiscus identified by the presence of ten superomarginals, of which the penultimate plates are enlarged and strongly convex. Secondary plates are present, variably. Four or five furrow spines.
Comments. Larger specimens of this species from Madagascar are approximately the same size (R=7.0, r=4.5) as the type described by A.M. Clark (1976), but differ in having ten superomarginal plates per interradius versus eight in the holotype and four to five furrow spines versus the five listed by A.M. Clark. Of the two specimens representing this species, the dry specimen (IE-2013-6606, R= 7.5 cm) displays a substantially higher number of secondary plates ( Fig. 33D View FIGURE 33 ) on the abactinal surface compared to IE-2007-3988 which shows relatively fewer, these limited to the proximal disk region (R= 6.4 cm). However the wet specimen (IE=2007-3988) has demonstrates much more strongly convex penultimate superomarginals than IE-2013-6606 that are more consistent in size and shape with the other smaller superomarginals.
Consistent with A.M. Clark’s (1976) observation and based on deck shots of the Madagascar specimen, this species is a rich red-orange color.
Occurrence. Vicinity of St. Paul and Amsterdam Islands, South Atlantic (Bouvetoya Island and Tristan de Cunha), Madagascar 195–585
Material Examined. Madagascar. GoogleMaps IE-2013-6606 . Madagascar GoogleMaps , 12°50’S, 48°9.1’ E, 580–585 m, Coll. A. Crosnier 14 Sept. 1972, 1 dry spec. R=7.5, r=5.3; IE-2007-3988 . Madagascar 26°08’S 45°40’E, 426 m, Coll GoogleMaps . ATIMO VATAE, N/O Nosy B e 11 DW 3554 . 1 wet spec. R=6.4 r=4.4
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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