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Nuculana cowlitzensis
Taxonomy
Leda cowlitzensis was named by Weaver and Palmer (1922). Its type specimen is UW (unknown number), a shell, and it is a 3D body fossil. Its type locality is UW 329, which is in a Bartonian marine horizon in the Cowlitz Formation of Washington.
It was recombined as Nuculana cowlitzensis by Turner (1938).
It was recombined as Nuculana cowlitzensis by Turner (1938).
Sister species lacking formal opinion data
N. alferovi, N. amuriensis, N. bathurstensis, N. borsonii, N. calkinsi, N. camelorum, N. castor, N. coelata, N. coloradoensis, N. complanata, N. corbetensis, N. corpulentoides, N. demissa, N. deshayesiana, N. dodona, N. dodsoni, N. duplicarina, N. equilateralis, N. evansi, N. fiski, N. inornata, N. kenyana, N. kittensis, N. minmiensis, N. mutuata, N. saffordana, N. securiformis, N. smirna, N. sulcellata, N. travisana, N. turgeo, N. tyrolensis, N. yunnanensis, N. pennula, N. compalana, N. slodkewitschi, N. parleacllli, N. taioma, N. vadosa, N. carinata, N. elliptica, N. grandensis, N. perdita, N. perlonga, N. yatsushiroensis, N. meriani, N. duplicarina, N. fragilis, N. gnonom, N. nagaoi, N. wajampolkana
Synonymy list
| Year | Name and author |
|---|---|
| 1922 | Leda cowlitzensis Weaver and Palmer p. 6 figs. pl. 10, fig. 4 |
| 1938 | Nuculana cowlitzensis Turner p. 42 |
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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.
†Nuculana cowlitzensis Weaver and Palmer 1922
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. E. Weaver and K. Palmer 1922 | Shell small and thin, sub-oval in outline ; posterior end rostrate
and pointed ; anterior end regularly and broadly rounded, ventral margin curved, posterior end sloping at an angle of 30 to the ventral line terminating at the dorsal margin in a beak; posterior dorsal margin directed downward and concave; lunule narrow and elongate, only slightly impressed and limited by a fine line ; escutcheon narrow and impressed ; surface ornamented with concentric ribbing which continues from the anterior margin, regularly to the rostrum, the ribs are numerous with only slight interspaces, they are prominent and have the appearance of slightly overlapping each other from the ventral region toward the ambones ; a faint groove extends from the beaks to the posterior point of the ventral margin, just back of which the concentric sculpture is somewhat obliterated except for faint lines of growth. |
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 Danian to the top of the Priabonian or 66.00000 to 33.90000 Ma
Collections (12 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Danian - Thanetian | Russian Federation | Nuculana cowlitzensis (49981) | |
| Lutetian - Bartonian | USA (Washington) | Nuculana cowlitzensis (43346) | |
| Bartonian | USA (Oregon) | Nuculana cowlitzensis (200858 200859 200860 200868 201047) | |
| Bartonian | USA (Washington) | Leda cowlitzensis (201124 201131) Nuculana cowlitzensis (203164) | |
| Bartonian - Priabonian | Russian Federation | Nuculana cowlitzensis (50139) | |
| Priabonian | USA (Washington) | Nuculana cowlitzensis (202067) |