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Astartella concentrica
Taxonomy
Nuculites concentrica was named by Conrad (1842). It is not a trace fossil.
It was recombined as Astartella concentrica by Girty (1915), Morningstar (1922), Girty (1927), Elias (1957), Hoare (1961), Gordon and Pojeta (1975), Hoare et al. (1979), Hoare et al. (1989), Kues (1991) and Kues et al. (2002).
It was recombined as Astartella concentrica by Girty (1915), Morningstar (1922), Girty (1927), Elias (1957), Hoare (1961), Gordon and Pojeta (1975), Hoare et al. (1979), Hoare et al. (1989), Kues (1991) and Kues et al. (2002).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1842 | Nuculites concentrica Conrad p. 248 figs. pl. 15 f. 19 |
| 1859 | Edmondia concentrica McChesney p. 55 |
| 1865 | Edmondia concentrica McChesney figs. pl. 2 f. 21a-b |
| 1867 | Astartella concentrica McChesney p. 43 figs. pl. 2 f. 21a-b |
| 1915 | Astartella concentrica Girty p. 142 figs. pl. 18 f. 2-9 |
| 1922 | Astartella concentrica Morningstar p. 214 figs. pl. 13 f. 11-13 |
| 1927 | Astartella concentrica Girty p. 418 figs. txt. f. 1-11 |
| 1957 | Astartella concentrica Elias p. 783 figs. pl. 96 f. 6 |
| 1961 | Astartella concentrica Hoare pp. 126-127 figs. pl. 15 f. 6 |
| 1975 | Astartella concentrica Gordon and Pojeta p. E18 figs. pl. 4 f. 4-7 |
| 1979 | Astartella concentrica Hoare et al. p. 54 figs. pl. 14 f. 18-23 |
| 1989 | Astartella concentrica Hoare et al. p. 594 fig. 5.26–5.28 |
| 1991 | Astartella concentrica Kues p. 238 fig. 3.3 |
| 2002 | Astartella concentrica Kues et al. p. 129 figs. 4S-U |
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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.
†Astartella concentrica Conrad 1842
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Invalid names: Edmondia concentrica McChesney 1859 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. S. Kues et al. 2002 | The valves have a suboval to subrectangular shape with low beaks situated about one-fourth to one-third of the distance from the anterior to posterior margins. The characteristic deep circular lunule below the beaks, and deep fusiform escutcheon along the posterodorsal margin are preserved on a few of the specimens. The length/height ratio of the valves averages approximately 1.35, and they attain a maximum length of approximately 30 mm. Ornamentation consists of high, sharp, widely spaced comarginal ribs, approximately 6–7/5 mm near the center of the valve. These ribs are evenly spaced except near the ventral valve margin, where they become irregular. Fine growth lines are present between the ribs. |