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Trematotrochus

Tenison-Woods, 1879, p. 59

Type Species

Conocyathus fenestratus Tenison-Woods, 1878, p. 188, no fig.; Monotypy

Type Specimen: Syntype; MAMU F420, F1698; Verified; Dry Preserved

Type Locality: Middle Miocene (Balcombian): Muddy Creek, Victoria

Classification

Synonyms

Diagnosis

Corallum ceratoid, with a pointed base and circular in cross section; GCD less than 4.5 mm; theca perforate; costae granular, originating by trifurcation; septa hexamerally arranged in 3-4 cycles; one crown of 6 small P2; columella rudimentary/papillose.

Comparisons

Unique in having a truly perforated theca.

Remarks

This genus and family was monographed by Cairns (1997), which included a phylogenetic analysis based on morphology. Seven species, only two Recent, listed by Cairns (1997).

Distribution

  • Australasia; Eocene
  • Australasia; Miocene
  • Western Pacific; Recent
  • Western Atlantic; Recent
Recent: 150-576 m; FIGURES: Cairns 1997: figs. 3h, 6g, 10a (pores)

This page has been in preparation since 18-Jul-2008 18:32

This version was contributed by Stephen D. Cairns on 19-Nov-2008 20:39.

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 longitudinal fracture through theca revealing three broken intercostal lamellae
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View of porous theca
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View of porous theca
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Calicular view of corallum
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