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Etea angulata
Taxonomy
Meretrix angulata was named by Packard (1922). Its type specimen is UCMP 12307 and is a 3D body fossil. Its type locality is UCMP loc. 2136, Santa Ana Mountains, which is in a Turonian/Campanian marine horizon in the Ladd Formation of California.
It was recombined as Etea angulata by Popenoe (1937), Anderson (1958).
It was recombined as Etea angulata by Popenoe (1937), Anderson (1958).
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.
†Etea angulata Packard 1922
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Packard 1922 | Shell medium sized; inequilateral; posterior dorsal slope nearly straight; anterior end evenly rounded; posterior extremity truncated; base broadly rounded; Umbones tumid, with blunt beaks. Anterior dorsal margin slightly excavated underneath the beak; lunule ill-defined; a prominent ridge extends from the beak to the posterior ventral margin ; inner margin in smooth, hinge showing, imperfectly, three cardinals and two laterals. Length of type, 59 mm.; height, about 45 mm.; convexity , 15 mm. | |
| W. P. Popenoe 1937 | The following notes sup- plement the original description of this species: Dentition of the right valve con- sists of two cardinal teeth and two lateral sockets; right anterior cardinal thin, laminar, oblique, lying close up under the Iunular border; right posterior cardinal longer, more robust, weakly bifid, the anterior element of the bifid tooth being short and splintlike; tooth obliquely ventrally directed; anterior socket deep, short, close to the anterior cardinal; pos- terior socket deep, narrow, long, situated midway between the umbo and the pos- terior end of the shell; dentition of the left valve consists of two cardinal teeth and two lateral teeth; anterior cardinal stout, triangular, weakly bifid, situated directly beneath the beak; posterior car- dinal long, thin, laminar, close up under the nymph; anterior lateral close to the beaks, short, stout, prominent; posterior lateral long, thin, distant from the beaks; ligament rather short, narrow, external; pallial line simple. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Aberhan et al. 2004 | |||||
Age range: base of the Late/Upper Turonian to the top of the Early/Lower Campanian or 93.90000 to 72.20000 Ma
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Turonian | USA (California) | Etea angulata (215284) | |
| Late/Upper Turonian - Middle Campanian | USA (California) | Meretrix angulata (207816) | |
| Early/Lower Campanian | USA (California) | Etea angulata (185171 220929 238648) | |
| Late/Upper Campanian | USA (California) | Etea angulata (185168) | |
| Middle Campanian | USA (California) | Etea angulata (220910 220911 220913 220918 220919 220921 220926) |