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Mastigactis
Taxonomy
Mastigactis was named by Spencer (1930) [Sepkoski's age data: O Ashg-m D u]. It is not extant. Its type is Eugasterella aranea. It was considered monophyletic by Dean Shackleton (2005).
It was assigned to Euzonosomatidae by Spencer (1930); to Oegophiurida by Sepkoski (2002); and to Encrinasteridae by Owen (1965), Spencer and Wright (1966) and Dean Shackleton (2005).
It was assigned to Euzonosomatidae by Spencer (1930); to Oegophiurida by Sepkoski (2002); and to Encrinasteridae by Owen (1965), Spencer and Wright (1966) and Dean Shackleton (2005).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1930 | Mastigactis Spencer |
| 1965 | Mastigactis Owen p. 553 |
| 1966 | Mastigactis Spencer and Wright p. U86 |
| 2002 | Mastigactis Sepkoski |
| 2005 | Mastigactis Dean Shackleton p. 81 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Dean Shackleton 2005 | Ambulacral boot and hell merge with gradual curve, not sharply offset. |