Stromboidea

• Aporrhaidae
  • Anchura
    • Anchura angulata (Gabb, 1864)

Original Description of Aporrhais angulata by Gabb, 1864, p. 128:

• "Shell elongated; spire high; whorls numerous, number unknown; upper whorls convex, widest a little below the middle; last whorl sharply and acutely angulated, sloping and gently concave above and below the angle; suture impressed. Surface ornamented by fine, thread-like, revolving lines, and by sinuous lines of growth. Canal long, narrow, straight. Outer lip curved, unicarinate, exact form unknown."

Locus typicus: Bull’s Head Point, near Martinez, Contra Costa County, California, USA.

Stratum typicum: Eocene (Dickerson, 1914)

Types: lectotype ANSP IPC no. 4270(?) (Stewart, 1927)

Aporrhais angulata Gabb, 1864, pl. XX, fig. 84

History and Synonymy

1914

Dickerson, 1914, p. 143:

• Alaria sp.
• "Shell elongated; spire high; nine or ten whorls; upper whorls spinous, convex, widest a little below the middle; last whorl sharply and acutely angulated, sloping and gently concave above and below the angle; suture impressed. Surface ornamented by fine, thread-like, revolving lines, and by sinuous lines of growth. Canal long, narrow, straight. Outer lip unicarinate, slightly curved."
• "Dimensions. Width of body whorl, 11 mm.; approximate height of spire, 12 mm."
• "Occurrence. University of California Locality 692."
• "This species resembles Anchura angulata Gabb closely and it may be identical with it, as Gabb's description was based upon a single poorly preserved specimen found at Bull's Head Point. This form may later be found to belong to the genus Spinigera."

Alaria sp. Dickerson, 1914, pl. 14, fig. 3

1927

Anchura (?) angulata in Stewart, 1927, pl. XXII, figs, 4, 5

Stewart, 1927. p. 361:

• "The larger specimen is the lectotype, no. 4270 (fig. 4). The smaller specimen, no 4071 (fig. 5), shows the ornamentation of the spire. Height of lectotype (incomplete) 49 mm.; width of body whorl and expanded lip, 33.5 mm.; length of 4071, 14 mm. Horizon, Cretaceous; locality, "Bull's Head Pt. near Martinez." A specimen labelled "Huling Creek" is fragmentary, but apparently belongs to this species. THis species seems to be at least subgenerically removed from A. falciformis. Its fine sculpturing suggests Drepanochilus but it evidently had a longer anterior canal."

References

• Anderson (1938)
• Anderson (1958)
• Dickerson, 1914
• W.P. Elder and L.R. Saul (1996)
• Gabb, W. M. (1864). Description of the Cretaceous fossils. In: Meek, F. B. and Gabb, W. M. Geological Survey of California, Palaeontology of California. 1: 55-243, pls. 9-32, Fulltext
• Gabb (1869)
• F. B. Meek and W. M. Gabb, 1864
• Roy, (1994)
• Stewart, R.B. (1927) Gabb's California fossil type gastropods. Proceedings of the Academy of Natural Sciences of Philadelphia, 78, 287–447, pls. 20–32.
• Stewart, 1930
• Sohl (1967)
• Webster (1983)