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Democrinus
Taxonomy
Democrinus was named by Perrier (1883) [Sepkoski's age data: K Maes-l R Sepkoski's reference number: 864]. It is extant. Its type is Democrinus parfaiti.
It was assigned to Bathycrinidae by Rasmussen (1961) and Donovan (1994); to Bourgueticrinida by Sepkoski (2002); and to Bourgueticrinidae by Ciampaglio et al. (2007) and Hess and Messing (2011).
It was assigned to Bathycrinidae by Rasmussen (1961) and Donovan (1994); to Bourgueticrinida by Sepkoski (2002); and to Bourgueticrinidae by Ciampaglio et al. (2007) and Hess and Messing (2011).
Species
D. braueri, D. brevis, D. chuni, D. dubius, D. gisleni, D. maximus, D. parfaiti (type species), D. simmsi
Synonymy list
| Year | Name and author |
|---|---|
| 1883 | Democrinus Perrier |
| 1961 | Democrinus Rasmussen p. 204 |
| 1994 | Democrinus Donovan p. 196 |
| 2002 | Democrinus Sepkoski |
| 2007 | Democrinus Ciampaglio et al. p. 245 |
| 2011 | Democrinus Hess and Messing p. 149 |
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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.
G. Democrinus Perrier 1883
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†Democrinus braueri Doderlein 1912
†Democrinus brevis Clark 1909
†Democrinus chuni Doderlein 1907
†Democrinus dubius Nielsen 1913
†Democrinus gisleni Rasmussen 1961
†Democrinus maximus Nielsen 1915
†Democrinus parfaiti Perrier 1883
†Democrinus simmsi Ciampaglio et al. 2007
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. N. Ciampaglio et al. 2007 | After Rasmussen (1978: T844): “Cup variably slender conical, cylindrical, or fusiform, composed of 5 very high, slender basals forming greater part of cup and super- posed by 5 short radials surrounding narrow central canal. Su- tures distinct. Radial articular facets large. Articulation of basal circlet with top of stem smooth and circular, with diame- ter corresponding to base of cup. Growth of cup mainly affects basal circlet, height increasing more than width, mature speci- mens attaining slender, more cylindrical form. Interradial nerve canal extends from basals in sutures between radials be- fore dividing. Arms 5, undivided. Every second brachial articu- lation is synostosial, synarthrial, or trifascial. Synostosial artic- ulations may be modified, a short median ridge from axial canal to dorsal edge of proximal articular facet fitting into a furrow in distal face of preceding brachial. Few (generally less than 6) low proximal columnals have synostosial articulations. More distal columnals resemble those of other Bathy- crinidae.”. |