Abstract
Internal moulds of complete shells, including conch and associated opercula, of the hyolith Triplicatella disdoma from Cambrian Series 2, Stages 3-4 of South Australia are described. The conch of T. disdoma is shown to be narrow and cone-shaped, and with a rounded triangular cross-section. The conch shows a gentle dorsal curvature in lateral view. The fossils lack evidence of helens, and the operculum was smaller than the apertural diameter of the conch and could be withdrawn a short distance into the conch. Triplicatella was probably closely related to orthothecid hyoliths.
Original language | English |
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Pages (from-to) | 148-153 |
Number of pages | 6 |
Journal | Alcheringa |
Volume | 38 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2014 |
Keywords
- Hyolitha
- Orthothecida
- early Cambrian
- shell articulation