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Corystos thorntoniensis

Corystos thorntoniensis was named by Vendrasco et al. (2010). Its type specimen is CPC 39742, a shell, and it is a 3D body fossil. Its type locality is Section 417, Georgina Basin, Thorntonia Area, which is in a Floran sand shoal lime mudstone in the Gowers Formation of Australia.

Synonymy list
YearName and author
2010Corystos thorntoniensis Vendrasco et al. pp. 130 – 131 figs. txt. f. 3F-G; pl. 5

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EubilateriaAx 1987

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

M. J. Vendrasco et al. 2010Low, cap-shaped shell; broad apex lies flat over short vertical section of shell at anterior or posterior margin (depending on whether animal was exogastric or endogastric); surface of internal moulds rough with pits and faint longitudinal striations.

Shell patelliform, 0.6–0.8 mm long, low (length ⁄ height >2.0), oval aperture, length ⁄ width c. 1.35; apex large, rounded, parallel to aperture; long, narrow internal ridge between apex and sub-apical surface; sub-apical surface vertical; texture on internal mould of round pits, square-shaped depressions and imprints of lamellae. Apex and sub-apical shelf typically have smoother surface than remaining shell surface. In some internal moulds, the imprint of the sub-apical shelf stands out relative to the imprint of the adjacent portions of shell margin.