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Tropidocyathus

Milne Edwards and Haime, 1848, p. 326

Type Species

Flabellum lessonii Michelin, 1842, p. 119, no fig.; Monotypy

Type Specimen: Holotype; MNHN ; Verified; Dry Preserved

Type Locality: Never given

Holotype rediscovered at MNHN in 1999; type species well described by Alcock (1902c) and Cairns (1989).

Classification

Diagnosis

Corallum cuneiform, with a rounded base and prominent granular, alate edge crests; GCD up to 16 mm; theca imperforate; costae granular, higher cycle costae originating by trifurcation; septa hexamerally arranged in 4 cycles; P1-3 prominent in 3 crowns; columella papillose.

Comparisons

Differs from Cyathotrochus in having granular, trifurcating costae and alate edge costae.

Remarks

This genus and family was monographed by Cairns (1997), which included a phylogenetic analysis based on morphology. Four species are placed in this genus (Cairns, 1997; Cairns and Zibrowius, 1997), the two late Cretaceous species (Filkorn, 1994) being tentative.

Distribution

  • Antarctica; Late Cretaceous
  • East Asia; Pleistocene
  • Indian Ocean; Recent
  • Western Pacific; Recent
Recent: 50-536 m; Figures: Cairns, 1997: figs. 1e, 4e

This page has been in preparation since 08-Oct-2008 15:21

This version was contributed by Stephen D. Cairns on 18-Nov-2008 20:19.

Page authors are: Stephen D. Cairns. Please contact the editor if you would like to contribute to the diagnosis of this taxon.

The editor is: Stephen D. Cairns


view of costal granulation
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Calicular view of corallum
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Lateral view of corallum
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