Stromboidea

• Aporrhaidae
  • Anchura
    • Anchura nanaimoensis (Whiteaves, 1879)

Original Description of Potamides tenuis var. nanaimoensis Whiteaves, 1879, p. 121:

• "Shell turreted, very long and slender; whorls nine, increasing very gradually in size. The first five are convex, but somewhat compressed at the sides; the sixth, seventh and eighth are also gently convex, but more or less angular or subcarinated a little below the middle. The body whorl is moderately inflated and faintly and spirally subcarinated considerately above the middle, and there is sometimes a second and smaller keel or ridge below the first. tho aperture appears to have been obliquely subovate when perfect, and to have contracted suddenly below into a short, nearly straight, and channeled beak. The surface is transversely ribbed and striated, and the lower whorls are also encircled by narrow, linear, revolving ridges. A large portion of the test on the body whorl happens to have been broken off in the few specimens yet collected, but on the last whorl but one the transverse ribs are distant, narrow and flexuous. On this whorl, too, and on that which precedes it, there are three rather widely separated revolving ridges above the angle, and four much more closely disposed ones below it. The summit of the angle also bears a single spiral ridge, which gives the shell a lightly carinated aspect, but the ridge on the angle is not larger nor more prominent than either of those above it. All the revolving ridges are marked by tubercles where the ribs cross them, but the tubercles are largest on the angles of the whorls."

Potamides tenuis var. nanaimoensis Whiteaves, 1879, pl. 15, fig. 9, 9a

History and Synonymy

1996

Elder & Saul, 1996, p. 381:

• "Other previously described Campanian and Maastrichtian age species are A. callosa Whiteaves, 1903, probably from the Cedar District Formation (Ward, 1978) on Vancouver Island, British Columbia, A. gibbera Webster, 1983, from the Rosario Formation near Santa Catarina Landing, Baja California, Mexico, and "Potamides tenuis" namaimoensis Whiteaves, 1879, which is undoubtly an Anchura, but is based upon immature specimens."

Elder & Saul, 1996, p. 383:

• "'Potamides tenuis' nanimoensis Whiteaves (1879) is an Anchura very similar to A. falciformis and A. phaba, but the type specimens are too immature either to separate A. nanaimoensis with certainty from these species or to combine it with one of them."

References

• Elder & Saul, 1996
• Whiteaves, J. F. (1879). Mesozoic fossils: On the fossils of the Cretaceous rocks of Vancouver and adjacent islands in the Strait of Georgia. Canada Geological Survey. 1(2): 93-190