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Tropidaster pectinatus
Taxonomy
Tropidaster pectinatus was named by Forbes (1850). It is not extant. Its type specimen is Syntype BNHM E 1861, E 13570, OR 75690-2. Its type locality is Mickleton Tunnel, near Chipping Campden, which is in a Davoei transition zone/lower shoreface shale in the Charmouth Mudstone Formation of the United Kingdom. It is the type species of Tropidaster.
Synonymy list
| Year | Name and author |
|---|---|
| 1850 | Tropidaster pectinatus Forbes figs. pl. 3 |
| 1966 | Tropidaster pectinatus Spencer and Wright p. U67 figs. fig. 61.1 |
| 1967 | Tropidaster pectinatus Wright p. 163 |
| 1993 | Tropidaster pectinatus Lewis pp. 66-67 |
| 1996 | Tropidaster pectinatus Blake pp. 182-187 figs. pl. 1 figs. 1-2, 4-7, pl. 2 figs. 2-8 |
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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.
†Tropidaster pectinatus Forbes 1850
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. B. Blake 1996 | A Velatida in which the ossicles are stout in comparison with most members of the order. A distinct groove on the dorsal interbrachial axis is plated, lined by partially differentiated paxilla. The ossicles about the anus are enlarged and block-like. On the ambulacral ossicles, the adradial ambulacral body is prolonged and strongly overlapping and a ventral medial articular flange linking subsequent ambulacrals is developed. Ambulacral ossicles are large, occupying the entire ventral surface of the arms beyond the ambulacra; they are like those of the Solasteridae except that the ambulacral articular structures are restricted to the adradial end of the adambulacral; actinal ossicles are lacking, and the adambulacrals abut across the ventral interbrachial surface. |