Key:  Family Neptuneidae

Phylum Mollusca
 Class Gastropoda
  Subclass Prosobranchia
   Order Neogastropoda
    Suborder Rachiglossa

Taken primarily from  Kozloff, 1987, 1996   p. 225 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)
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1a  Height about 3 times the diameter; siphonal canal about half the total length of the aperture Exilioidea rectirostris
1b Height less than 3 times the diameter; siphonal canal usually less than half the total height of the aperture 2
2a Height of aperture about four-fifths the height of the shell Volutharpa ampullacea
2b Height of aperture not more than two-thirds the height of the shell 3
3a Outer lip of aperture curving convexly until it reaches the tip of the siphonal canal (it may, however, be slightly sinuous, especially in species that have spiral ridges on the body whorl) 4
3b Outer lip of aperture generally with an obvious indentation just above the siphonal prolongation 5
4a Height of aperture, including the siphonal canal, about half the height of the shell; spiral ridges pronounced, convex, some of them not much wider than the furrows between them; periostracum largely limited to the furrows between the ridges; with or without axial ribs
B. undatus Dall, 1919, which has axial ribs, is here considered to be a synonym
Beringius crebricostatus
4b Height of aperture slightly more than half the height of the shell; spiral ridges, if prominent, not markedly convex and much wider than the furrows between them (in some specimens, spiral ridges are evident only on the body whorl); without axial ribs (periostracum fibrous, abundant, and usually continuous) Beringius eyerdami
5a Shell smooth or with closely spaced, contiguous spiral ridges, all ridges on a particular whorl being of about the same size (axial ribs may also be present); whorls without angular shoulders 6
5b Shell either with widely spaced spiral ridges (these may be restricted to the upper whorls) or with spiral ridges of decidedly different sizes; whorls usually with angular shoulders 10
6a Without axial ribs, with or without closely spaced spiral ridges (includes one fairly common subtidal species, Colus halli 7
6b With rather prominent axial ribs, as well as with closely spaced spiral ridges (rare subtidal species) 9
9a With about 23-28 axial ribs on each whorl; height up to 3 cm Plicifusus griseus
(Now = Colus griseus in family Buccinidae)
9b With 12-15 axial ribs on each whorl; height up to 1.8 cm Mohnia frielei

Taxonomic Levels Represented in This Key:

  Plicifusus griseus = Colus griseus

Page created by Dave Cowles, 2005
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