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Euthyrhachis indianense
Taxonomy
Platyceras indianense was named by Miller and Gurley (1897). It is a 3D body fossil.
It was corrected as Platyceras indianensis by Kindle (1900); it was recombined as Platyceras (Euthyrhachis) indianense by Tyler (1965) and Blodgett and Frýda (1999); it was recombined as Euthyrhachis indianense by Bandel and Frýda (1999) and Wagner (2023).
It was corrected as Platyceras indianensis by Kindle (1900); it was recombined as Platyceras (Euthyrhachis) indianense by Tyler (1965) and Blodgett and Frýda (1999); it was recombined as Euthyrhachis indianense by Bandel and Frýda (1999) and Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1897 | Platyceras indianense Miller and Gurley pp. 48 – 49 figs. pl. 4, f. 7-10 |
| 1900 | Platyceras indianensis Kindle pp. 727 - 728 figs. PI. 19. figs 9,9a. |
| 1965 | Platyceras (Euthyrhachis) indianense Tyler p. 345 figs. pl. 47 f. 16-18 |
| 1999 | Euthyrhachis indianense Bandel and Frýda p. 222 |
| 1999 | Platyceras (Euthyrhachis) indianense Blodgett and Frýda p. 304 |
| 2023 | Euthyrhachis indianense Wagner p. S611 |
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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.
†Euthyrhachis indianense Miller and Gurley 1897
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. H. Tyler 1965 | Shells with features typical of subgenus; nodes absent from earliest part of carina but typically present on late apical part and becoming increasingly larger and well defined adaperturally, tending to be closer and slightly more regularly spaced in earlier half of mature part of shell; nodes in adult, perhaps gerontic, part of some shells gradually becoming tubular spines with thick walls and elliptical cross-sections with an observed maximum maximum and minimum diameter of 0.8 mm. and 0.5 mm.; spine bases inclined adaperturally at roughly 45 degrees from carina; collabral growth lines indicating that during ontogeny portion of shell along carina grew increasingly more slowly as compared with flank portions of shell creating an increasingly deeper sinus in later growth stages, indicating that development of spines rather than nodes was concomitant effect of enclosure of protruding anal(?) siphon by newly secreted shell; carina in earlier growth stages, contrariwise, indicating no lagging behind in growth, as nodes rather than spines formed as siphon position kept pace with shell secretion along carina; holotype and several paratypes showing mottling of medium brown spots and irregular blotches on dark gray shell. |