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Spondylus subnodosus
Taxonomy
Lima subnodosa was named by Packard (1922). Its type specimen is UCMP 12275 and is a 3D body fossil. Its type locality is UCMP loc. 2149, Santa Ana Mountains, which is in a Campanian marine horizon in the Williams Formation of California.
It was recombined as Spondylus subnodosus by Elder (1991).
It was recombined as Spondylus subnodosus by Elder (1991).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1922 | Lima subnodosa Packard p. 421 figs. Plate 28 |
| 1922 | Spondylus striatus Packard p. 422 figs. pl. 27, fig. 3 |
| 1924 | Spondylus fucatus Hanna p. 181 |
| 1990 | Spondylus striatus Squires and Demetrion p. 385 |
| 1991 | Spondylus subnodosus Elder p. E10 figs. Pl 2, figs 1-4; pl 3, figs 8,13 |
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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.
†Spondylus subnodosus Packard 1922
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Invalid names: Spondylus fucatus Hanna 1924 [synonym], Spondylus striatus Packard 1922 [replaced]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Packard 1922 (Spondylus striatus) | Shell very large, nearly oval in outline; inequivalve; beak of right valve small and pointed, that of the left valve apparently large and irregular. Anterior dorsal margin nearly straight but curving below the ear to meet the even curve of the base; posterior margin slightly concave near the beaks . Anterior ear of the right valve about 36 millimeters long. Shell of right valve about 10 millimeters thick, that of the left valve being somewhat thinner, due in part to a pitted condition of the surface apparently produced by a marine organism. Right valve ornamented by a large number of fine radiating ribs, which are ridged longitudinally and tend to become nodose toward the base of the shell. The lower (left) valve rugose, and apparently not so distinctly ribbed. Hinge and interior of the shell unknown . Length of type, 115 mm .; height, 145 mm.; diameter, 75 mm. | |
| E. L. Packard 1922 | Shell very large, nearly equivalve; anterior dorsal margin sloping in a straight line from the beaks to a point about midway from the beaks to the base. Anterior end evenly rounded; base arcuate; posterior dorsal margin apparently curves convexly from the small beak toward the posterior extremity, which appears to be broken. Anterior ear long, the dorsal margin sloping slightly; posterior ear broken. Surface of the valve ornamented by numerous fine ribs becoming obscured toward the base by radial rows of nodes on some of the stronger ribs. These nodes extend from 3 to 5 millimeters above the surface from which they rise. Length of type, 140 mm.; height, 150 mm.; convexity, 30 mm.
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Measurements
No measurements are available
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| Source: g = genus, f = family, o = order | |||||
| References: Aberhan et al. 2004, Kiessling 2004 | |||||
Age range: base of the Aptian to the top of the Early/Lower Maastrichtian or 125.00000 to 66.00000 Ma
Collections (12 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Aptian | United Kingdom (England) | Spondylus striatus (1780) | |
| Late/Upper Albian | United Kingdom (England) | Spondylus striatus (6280) | |
| Late/Upper Albian | Sweden (Halland) | Spondylus striatus (38722) | |
| Cenomanian | United Kingdom (England) | Spondylus striatus (81062) | |
| Early/Lower Cenomanian | France | Spondylus striatus (85020) | |
| Late/Upper Campanian | USA (California) | Spondylus striatus, Lima subnodosa (207822) Spondylus subnodosus (167696 167697 167698) | |
| Maastrichtian | Madagascar | Spondylus striatus (1322) | |
| Maastrichtian | Mexico | Spondylus striatus (1372) | |
| Early/Lower Maastrichtian | USA (California) | Spondylus striatus (224893) |