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Taxonomy
Flaventia zeta was named by Popenoe (1937). Its type specimen is CIT (IP) 3444 and is a 3D body fossil. Its type locality is CIT loc. 1068, Santa Ana Mountains, which is in a Turonian delta front siltstone/shale in the Ladd Formation of California.
It was recombined as Paraesa zeta by Saul (1993).
It was recombined as Paraesa zeta by Saul (1993).
Sister species lacking formal opinion data
Synonymy list
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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.
†Paraesa zeta Popenoe 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. P. Popenoe 1937 | Shell of medium size, strong, moderately inflated, elongate-oval in outline; beaks not very prominent, situated slightly anterior to the mid-length of the shell; anterior dorsal slope nearly straight from the beaks to the anterior end; ventral border smoothly curved between the anterior and posterior ends of the shell, forming nearly the arc of a circle; posterior dorsal border slightly arched, meeting the ventral border in a blunt angulation; ligament external, about one-half the length of the posterior dorsal border; lunule undefined; escutcheon spindle-shaped, long, narrow; ornamentation of growth-lines only, fine on the dorsal part of the shell, becoming coarse toward the ventral borders; pallial sinus short, broadly triangular, wide open at the base, ascending.
Hinge of three cardinal teeth and no laterals in each valve; right anterior and median cardinals short, slender, subparallel, diverging slightly distal to the beaks, directed obliquely forward from the beaks; right posterior cardinal strong, rather long, trigonal, very oblique, diverging at a small angle from the nymph, bifid, the anterior element being short and slender; left anterior and median cardinals short and thin, approximately equal in size, diverging from one another at a moderate angle directly ventral to the beaks; posterior left cardinal long, narrow, slightly curved, underlying and slightly divergent from the nymph; hinge plate of both valves shallowly ex- cavated in front of the anterior teeth. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Aberhan et al. 2004 | |||||
Age range: base of the Turonian to the top of the Early/Lower Campanian or 93.90000 to 72.20000 Ma
Collections (12 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Turonian | USA (California) | Flaventia zeta (215284 220390 220932 220933 238628) | |
| Turonian | USA (California) | Flaventia zeta (219050 220370 220375 220934 220935 220936) | |
| Early/Lower Campanian | USA (California) | Flaventia zeta (3885) |