Stromboidea
Original Description of Strombus subgracilior by Durham, 1950, p. 118:
- "Shell moderately large, stromboid, resembling S. gracilior Sowerby; spiral conical, not "stepped"; immature whorls of spire with about 11 small nodes; last 2¼ whorls smooth; suture appressed and immediately below shoulder of preceding whorl, so that side profile of spire is only slightly wavy; body whorl inflated, outer lip flaring; posterior siphonal notch large; no apparent ornamentation."
Locus typicus: Carmen Island, Baja California Sur, Mexico
Stratum typicum: Salada Formation, Pliocene
Strombus subgracilior Durham, 1950, pl. 27, fig. 7
Strombus subgracilior Durham, 1950; Salada Formation, Pliocene; Carmen Island, Baja California Sur, Mexico; Holotype; UCMP 30468; Coll. University of California Museum of Paleontology
Durham, 1950, p. 118:
- Dimensions of holotype: height 73.5 mm., greatest diameter (including outer lip) 56.4 mm.
- Holotype no. 30468 (loc. A 3533).
- OCCURRENCE: loc. A 3533, ? A 3562.
- RANGE: middle and upper Pliocene.
- REMARKS: This species may be distinguished from S. gracilior Sowerby (Pl. 27, fig. 5) by the straight-sided spire, the higher suture, and the lack of nodes on the body whorl.
References
- Durham, J. W. (1950) The 1940 E. W. SCRIPPS cruise to the Gulf of California: Part 2, Megascopic paleontology and marine stratigraphy, Geol. Soc. Am., Mem., p. 1–144, Fulltext
