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Eotebenna pontifex

Helcionelloida - Helcionellida - Yochelcionellidae

Taxonomy
Eotebenna pontifex was named by Runnegar and Jell (1976). It is not extant. Its type locality is ANU Collection 10352, 16 km northeast of Mootwingee Aboriginal Site, which is in a Solvan carbonate limestone in the Coonigan Formation of Australia.

Synonymy list
YearName and author
1976Eotebenna pontifex Runnegar and Jell
2010Eotebenna pontifex Vendrasco et al. pp. 115 – 116 figs. txt. f. 3S; pl. 9 f. 1-9
2023Eotebenna pontifex Wagner p. 5422

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classHelcionelloidaPeel 1991
orderHelcionellida
superfamilyYochelcionelloidea
familyYochelcionellidae
genusEotebenna
speciespontifex

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.

†Eotebenna pontifex Runnegar and Jell 1976
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Diagnosis
ReferenceDiagnosis
M. J. Vendrasco et al. 2010Most of the internal moulds examined show clear traces of foliated calcite over most of the surface (Pl. 9, figs 2–3, 5–7, 9). The growing edges of folia are sub-parallel to the growth lines and aperture margin. The sawtooth pattern (see Text-fig. 4L), regular spacing between edges of laminae, and growth in one direction are all consistent with the interpretation of this shell microstructure as foliated calcite. In addition, measurements of the interfacial angles of the growing edge of the folia had an average value of 107.7 degrees (n = 15; standard deviation = 5.29 degrees), which is much closer to the expected value of 102 degrees for type 1 foliated calcite (Runnegar 1984) than the set of expected values of 64, 90, 116 or 122 degrees for nacre (Runnegar 1985). Our results are virtually identical to what Runnegar (1985) measured (mean = 107.8 degrees; n = 168) in inferred cases of foliated calcite in specimens of Pseudomyona queenslandica, Tuarangia paparua and E. pontifex. One image (Pl. 9, fig. 6) shows the possible replication of calcite laths that made up the laminae.