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Taxonomy
Nucula decisa was named by Conrad (1855). Its type specimen is UCMP 31132 (neotype) and is a 3D body fossil.
It was recombined as Acila (Truncacila) decisa by Turner (1938), Moore (1983), Squires (1984), Squires (1987), Squires (1988) and Squires (1999).
It was recombined as Acila (Truncacila) decisa by Turner (1938), Moore (1983), Squires (1984), Squires (1987), Squires (1988) and Squires (1999).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
Year | Name and author |
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1855 | Nucula decisa Conrad pp. 11 - 12 figs. PI. 2, Fig. 19 |
1916 | Acila gabbiana Dickerson p. 481 figs. pl. 36, fig. 1 |
1922 | Nucula (Acila) stillwaterensis Weaver and Palmer p. 6 figs. pl. 8, fig. 8 |
1927 | Acila lajollaensis Hanna p. 270 figs. pl. 25, figs. 1, 3, 5, 7-8, 12, 15. |
1938 | Acila (Truncacila) decisa Turner p. 41 |
1983 | Acila (Truncacila) decisa Moore p. A10 figs. Plate 1, figure 14; plate 2, figures 1-3 |
1984 | Acila (Truncacila) decisa Squires p. 41 figs. Figure 10a |
1987 | Acila (Truncacila) decisa Squires p. 54 fig. 86 |
1988 | Acila (Truncacila) decisa Squires p. 17 fig. 44 |
1999 | Acila (Truncacila) decisa Squires p. 22 figs. Figure 49 |
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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.
†Acila (Truncacila) decisa Conrad 1855
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Invalid names: Acila gabbiana Dickerson 1916 [synonym], Acila lajollaensis Hanna 1927 [synonym], Nucula (Acila) stillwaterensis Weaver and Palmer 1922 [synonym]
Diagnosis
Reference | Diagnosis | |
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C. E. Weaver and K. Palmer 1922 (Nucula (Acila) stillwaterensis) | Shell small, rectangular in outline ; anterior dorsal margin
nearly straight, posterior ventral margin nearly straight, sloping to a broadly rounded anterior end which approaches the dorsal margin with greater convexity ; escutcheon impressed but not defined by an incised line ; central portion of the area of the escutcheon raised, protruding slightly beyond the posterior margin; surface ornamented with radiating ribs medium in strength; above the central portion of the shell the divarication is single, below the mid-area the series of divarication is comparatively wide, the duplication increasing ventrad forming five sets along the ventral margin ; the area of divarication occupying the middle third of the ventral portion of the shell ; lunule not defined ; surface with heavy, impressed growth lines forming wide undulations on the surface of the shell. |