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Porcellia (Porcellia) yukonensis
Taxonomy
Porcellia (Porcellia) yukonensis was named by Frýda et al. (2008). Its type specimen is GSC 131995, a shell, and it is not a trace fossil. Its type locality is Royal Creek Sec. 1, at 192-197 meters above basee, which is in a Pragian shallow subtidal carbonate/shale in the Road River Formation of Canada.
Synonymy list
| Year | Name and author |
|---|---|
| 2008 | Porcellia (Porcellia) yukonensis Frýda et al. pp. 597 – 598 figs. 3.1-3.4 |
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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.
†Porcellia (Porcellia) yukonensis Frýda et al. 2008
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Frýda et al. 2008 | Species of Porcellia (Porcellia) with distinct reticular ornamentation and lacking characteristic nodes of the type Porcellia (Porcellia) puzo and other species of Porcellia (Porcellia); collabral ribs dense and regularly spaced and crossed by numerous spiral threads; distance between threads about half of that between the collabral ribs; width of selenizone about 5% of width of dorsum; initial whorl of teleoconch distinctly dextrally coiled; aperture in cross-section almost circular, but slightly wider than high.
Disc-shaped shell with about 6 whorls and having diameter about 3.5 cm; width of teleoconch about one fourth of its diameter; planispirally coiled teleoconch bears narrow selenizone situated in middle of its dorsum; selenizone slightly depressed; width of selenizone about 5% of width of dorsum (Fig. 3.4 ); aperture in cross-section almost circular, but slightly wider than high; about two first teleoconch whorls distinctly dextrally coiled (Fig. 3.1, 3.2 ); shell ornamented by numerous collabral ribs (about 100 ribs on last whorl) crossed by dense spiral threads (Fig. 3.1–3.4 ); distance between threads about half of that between collabral ribs; ornamentation having same character on umbilical, lateral and dorsal surfaces of whorls; |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Bambach et al. 2007 | |||||