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Trigonarca californica
Taxonomy
Trigonarca californica was named by Packard (1922). Its type specimen is UCMP 12313 and is a 3D body fossil. Its type locality is UCMP loc. 2141, Santa Ana Mountains, which is in a Turonian/Coniacian marine horizon in the Ladd Formation of California.
Sister species lacking formal opinion data
Cucullaea austriaca, Cucullaea crassitesta, Cucullaea szaboi, T. abrupta, T. brahminica, T. canensis, T. cliffwoodensis, T. cuneiformis, T. curvatodonta, T. depressa, T. elongata, T. falloti, T. ferlinii, T. galdrina, T. maconensis, T. meridionalis, T. moutoniana, T. multidentata, T. obliqua, T. obliquata, T. obsoleta, T. passyana, T. semisulcata, T. szaboi, T. thevestensis, T. triquetra
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.
†Trigonarca californica Packard 1922
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Packard 1922 | Shell trigonal in outline, inequilateral, the posterior end being greatly produced; separated by a wide dorsal area; anterior end short, rather bluntly rounded; posterior end pointed; base line nearly straight, oblique to the hinge line. Umbones small, beaks acutely pointed; umbonal ridge extends from the beak to the posterior extremity. Area between umbonal ridge and posterior margin of shell flattened, and strongly depressed. Dorsal area deeply excavated, marked by at least five deeply incised chevron lines. Surface of shell sculptured by irregular lines of growth. Dentition consists of ten short, straight, posterior teeth, placed obliquely upon the hinge plate, and a less number of short, heavy, anterior teeth. Length, 52 mm.; height, 35 mm.; convexity, 15 mm. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Mikkelsen and Bieler 2008, Aberhan et al. 2004 | |||||
Age range: Turonian or 93.90000 to 89.80000 Ma
Collections (25 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Turonian | USA (California) | Trigonarca californica (194023 220390 220932 220933 220937 220938 220940 220941 238628 238630 238637 238638 238639 239925) | |
| Turonian | Mexico (Baja California) | Trigonarca californica (220406) | |
| Turonian | USA (California) | Trigonarca californica (44202 80927 176026 194022 219050 220375 220934 220935 220936) | |
| Late/Upper Turonian - Coniacian | USA (California) | Trigonarca californica (type locality: 207818) |