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Phygraea stewarti

Bivalvia - Ostreida - Gryphaeidae

Taxonomy
Ostrea stewarti was named by Hanna (1927) [DISTRIBUTION: Eocene; Eastern Pacific.]. Its type specimen is UCMP 30921–22, a shell, and it is a 3D body fossil. Its type locality is UCR loc. 4922, which is in a Lutetian deep subtidal shelf shale in the Ardath Formation of California.

It was recombined as Pycnodonte (Crenostrea) stewarti by Moore (1987); it was recombined as Phygraea stewarti by Squires (2018) and Hendy (2020).

Sister species lacking formal opinion data
Pycnodonte aucella, Pycnodonte gambaensis, Pycnodonte navaniaensis

Synonymy list
YearName and author
1927Ostrea stewarti Hanna p. 276 figs. pl. 1, fig. 29
1987Pycnodonte (Crenostrea) stewarti Moore p. 22
1987Ostrea stewarti Squires p. 58 fig. 98
2018Phygraea stewarti Squires p. 18 figs. Figures 150 – 173
2020Phygraea stewarti Hendy

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classBivalvia
—Eubivalvia
subclassAutobranchia(Groblen 1894)
infraclassPteriomorphia(Beurlen 1944)
RankNameAuthor
—OstreomorphiFerussac 1822
—OstreioniFerussac 1822
—OstreataFerussac 1822
superorderOstreiformiiFerussac 1822
orderOstreida(Fërussac 1822)
suborderOstreidina(Ferussac 1822)
superfamilyOstreoidea(Rafinesque 1815)
familyGryphaeidaeVialov 1936
subfamilyPycnodonteinaeStenzel 1959
genusPhygraea(Fischer von Waldheim 1835)
speciesstewarti()

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.

†Phygraea stewarti Hanna 1927
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Diagnosis
No diagnoses are available