Home > Northwest Shells & Marine Life > PNW Shells & Marine Life Photos > Gastropods >  Gastropods - Pyramidellidae

< Previous     Next >

Click on photo to enlarge.  Scale line in photo equals 1cm unless otherwise specified.
* Species which are commonly encountered on the beach.





The Odostome snails can be difficult to identify and are under study to sort out the species.  Ours were identified by Pyramidellidae authority Patrick LaFollette of the Natural History Museum, Los Angeles County.
 































Turbonilla aurantia
Turbonilla aurantia (Carpenter, 1864)
Golden Turbonille
intertidal to 37m          size to 7mm
California to BC
This is rarely found intertidally.  The shell is golden-yellow to reddish-brown.  There are 20-22 axial ribs per whorl.  They do not extend to the base of the last whorl.  The shell also has very fine spiral lines. 


 Pyramidellidae
Aartsenia satura
Aartsenia satura (Carpenter, 1864)
intertidal to shallow subtidal          size to 6mm
southern California to BC
This is rarely found intertidally in our area.  The shell is yellowish.
(previous name - Odostomia satura)










Evalea tenuisculpta Evalea tenuisculpta
                                                                                                 photographed intertidally on a Mopalia kennerleyi





Evalea tenuisculpta Evalea tenuisculpta
photographed intertidally on a Tresus capax siphon           photographed subtidally on
species tentatively identified as E. tenuisculpta                 Zirfaea pilsbryi, feeding                                                                                                     structures visible


Evalea tenuisculpta (Carpenter, 1864)
intertidal to 55m          size to 6mm
northern Mexico to Alaska
This is occasionally found intertidally.  It is a parasite and has been found on various species of mollusks.  The shell is white to yellow with microscopic spiral striations.  It has a rounded base and an oval aperture.
 It was recently found on Tresus capax which hadn't been observed before.  See article here.  It was subsequently found in another location on T. capax.
(previous name - Odostomia tenuisculpta)



The Turbonillas are a little understood group in the Pacific Northwest which need further study.   We do not attempt to identify them to species level at this time, except for T. aurantia.  Our numbering system does not correlate to any other reference, but is simply our own way to keep track of the types we have found.  We are not sure exactly how many valid species exist in our area.










Home  About Us  Meetings&Events  Articles  Northwest Shells  Links  Contact Us  Site Map


Turbonilla sp. 4 Turbonilla sp. 4
Turbonilla sp. 4



This page last revised: 2-17-2013





Turbonilla sp. 3
Turbonilla sp. 3

Turbonilla sp. 2
Turbonilla sp. 2

Turbonilla sp. 1
Turbonilla sp. 1

Gastropods 

Family Pyramidellidae












Brachystomia angularis
Brachystomia angularis (Dall & Bartsch, 1907)
intertidal to 64m          size to 6mm
southern California to southeast Alaska
This is rarely found intertidally in our area.  The shell is white.  The last whorl exhibits an angled lower portion.
(previous  name - Odostomia angularis)