Holcotrochus
Dennant, 1902, p. 1
Type Species
H. scriptus Dennant, 1902, p. 1, pl. 1, fig. 1; Monotypy
Type Specimen: Holotype; NMV P27086; Verified; Dry Preserved
Type Locality: Middle Miocene: Muddy Creek, Victoria
Type species best described by Cairns and Parker (1992: 32)
Classification
Diagnosis
Corallum solitary, small (up to 3.5 mm in GCD), unattached; theca imperforate; costae that correspond to septa quite wide, additional narrow intercostae also present; septa hexamerally arranged in two cycles, the second incomplete,resulting in 10 septa; pali and paliform lobes absent; columella rudimentary.
Comparisons
Differs from Conocyathus by having an imperforate theca and lacking pali.
Remarks
This genus (and family) was monographed by Cairns (1997), which included a phylogenetic analysis based on morphology; Recent specimens were later reported by Cairns (2004). Only two species are recognized in the genus.
Distribution
- Australasia; Oligocene - Miocene
- Western Pacific; Recent
Recent, South Australia, Victoria, Queensland, 9-414 m. Cairns and Parker, 1992: fig. 9 d, gThis page has been in preparation since 02-Jun-2007 12:36
This version was contributed by Stephen D. Cairns on 18-Nov-2008 20:35.
Page authors are: Stephen D. Cairns Ann Budd. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Stephen D. Cairns
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