Associated conchs and opercula of Triplicatella disdoma (Hyolitha) from the early Cambrian of South Australia

作者：Skovsted Christian B^*; Topper Timothy P; Betts Marissa J; Brock Glenn A

来源：Alcheringa, 2014, 38(1): 148-153.

DOI：10.1080/03115518.2014.843381

• Hyolitha
• Orthothecida
• shell articulation
• early Cambrian

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fossils lack evidence of helens, and the operculum was smaller than the apertural diameter of the conch and could be withdrawn a short distance into the conch.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. ???????????2????Triplicatella disdoma ????????, ??????????T. disdoma?????????, ??????????????????????????????????, ????????????, ????????????Triplicatella???????????????

• 出版日期2014-1-2