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Diagnostic Features
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- Type species based on disarticulated material. Test shape unknown; plating thin and imbricate.
- Apical disc unknown.
- Ambulacral structure unknown; ambulacral plates small; pore-pair slightly elongate.
- Each interambulacral plate with a central primary tubercle that is perforate and non-crenulate; no surrounding scrobicular circle or depressed areolar region. A few smaller secondary tubercles or granules present around edges of plate.
- Peristome and lantern unknown.
- Spines relatively long and needle-like; without cortex.
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Distribution
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Upper Devonian, USA. |
| Name gender |
feminine |
| Type |
Devonocidaris jacksoni Thomas, 1924, by original designation. |
| Species Included |
- Only the type species. Two other species have been assigned to this genus, but these are treated here as species of Deneechinus: D. primaevus Belanski, 1928; Upper Devonian, Iowa, USA; D. thomasi Stainsbrook, 1937; Devonian, Iowa, USA
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| Classification and/or Status |
Stem group Echinoidea; ?Archaeocidaridae.
Monotypic; type species based on fragmentary material andbasically indeterminate.
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| Remarks |
The type material cannot really be compared meaningfully with other taxa because it is based on isolated elements. The rather slender spines and presence of a primary perforate tubercle on interambulacral plates suggests affinities with Archaeocidaridae such as Deneechinus. The name is best treated as a nomen dubium and restricted to the type material.
Thomas, A. O. 1924. Echinoderms of the Iowa Devonian. Iowa Geological Survey Annual Reports 1919-1920, 29, 385-552.
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