Bourne, 1905, p. 192

Type Species

Cyathotrochus herdmani Bourne, 1905, p. 193, pl. 1, fig. 2; Monotypy

Type Specimen: Holotype; ; Not Traced; Unknown

Type Locality: Recent: off Ceylon (Gulf of Manaar, west of Periya Paar), depth not given

Probably a junior synonym of C. pileus (Alcock, 1902c)(see Cairns, 1997), the latter species well described by Cairns (1989: 34).



Corallum cuneiform , with a rounded base and elliptical in cross section; GCD up to 25 mm; theca imperforate; costae independent, ridged and serrate; septa hexamerally arranged in 4-5 cycles; pali present before all but last septal cycle (P1-3, 4); columella papillose to sublamellar.


Differs from Tropidocyathus by having ridged serrate independent costae and lacking alata edge costae.


This genus and family was monographed by Cairns (1997), which included a phylogenetic analysis based on morphology. Four species: 2 Recent and two fossil (see Cairns, 1997). See Cairns (2004) for generic synonymy.


  • Polynesia; Miocene
  • East Asia; Pleistocene
  • Indian Ocean; Recent
  • Western Pacific; Recent
Recent: 123-522 m; Figures: Cairns 1997: fig. 1g, 4f

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

This version was contributed by Stephen D. Cairns on 18-Nov-2008 20:06.

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

Cyathotrochus pileus,edge view
Cyathotrochus pileus, side view
Cyathotrochus pileus, calicular view
Lateral view of corallum

See all illustrations