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Taxonomy
Cardium coronaensis was named by Packard (1922). Its type specimen is UCMP 12281 and is a 3D body fossil. Its type locality is UCMP loc. 2130, Santa Ana Mountains, which is in a Turonian/Campanian marine horizon in the Ladd Formation of California.
It was recombined as Pachycardium coronaensis by Popenoe (1937); it was recombined as Pachycardium coronaense by Popenoe (1942).
It was recombined as Pachycardium coronaensis by Popenoe (1937); it was recombined as Pachycardium coronaense by Popenoe (1942).
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.
†Pachycardium coronaensis Packard 1922
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Packard 1922 | Shell small, nearly equilateral, as broad as high, subquadrate, ventricose; anterior dorsal margin slightly convex, curving gently to the anterior extremity; posterior dorsal margin nearly straight to a point beyond the hinge line, then slopes very abruptly to the base of the shell; base arcuate. Umbones prominent, tumid; beaks sharply pointed, adjacent; anterior dorsal area ill-defined. A ridge extending from the beak to the anterior margin suggests that this species belongs to the subgenus Protocardia. Inner margin entire. Surface poorly preserved, but apparently devoid of sculpture. Length of type, 32 mm.; height, 32 mm .; convexity, 24 mm . | |
| W. P. Popenoe 1937 | Shell small to medium in size, moderately inflated, shell substance rather thick; beaks high, narrow, prominent, prosogyrous, approximate; an- terior dorsal margin broadly rounded, merging with a smooth curve into the arcuate ventral margin; posterior margin nearly vertically truncate, meeting the posterior ventral margin with an angle of slightly less than 90°; posterior dorsal border very short; ligament short and depressed; Iunule restricted by a delicate incised line; hinge plate heavy; hinge angle approximately 55°.
Sculpture of the anterior and central slopes of the shell consists of delicateincised evenly and closely spaced concentric lines that are most evident on the umbonal region and become progressively fainter ventrally; concentric sculpture usually nearly or quite invisible on the ventral regions of well preserved shells but generally well-shown on eroded specimens; sculpture of the pos- terior slope consists of about twenty very low delicate close-set rounded radial ribs that are most strongly developed next to the sharp humeral angle of the shell and become progressively fainter posteriorly; shell margin faintly denticulate where these ribs terminate. Dentition consists of two cardinal teeth in each valve and strong anterior and posterior laterals; right anterior cardinal small, weak, anteriorly directed; right posterior cardinal strong, peglike, situated directly beneath the umbo; left anterior cardinal short, strong; left pos- terior cardinal thin and weak, directed obliquely backward; lateral teeth of both valves strong, distant from the beaks. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Todd 2001, Aberhan et al. 2004 | |||||
Age range: base of the Turonian to the top of the Middle Campanian or 93.90000 to 72.20000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Turonian | USA (California) | Pachycardium coronaense (220930 220941 239925) Pachycardium coronaensis (215284 220313) | |
| Turonian | USA (California) | Pachycardium coronaense (219050) | |
| Turonian - Early/Lower Campanian | USA (California) | Cardium coronaensis (207640) | |
| Middle Campanian | USA (California) | Pachycardium coronaense (176363) |