In simple terms (I am sure there are more exacting methods):

Tibia (Tibia) insulaechorab insulaechorab - mostly solid brown shell with a
long posterior canal that extends past the penultimate suture.

Tibia (Tibia) insulaechorab curta - brown shell with dark subsutural bands
and a shorter posterior canal

Tibia (Tibia) insulaechorab luteostoma - yellow stained aperture

Whether these are subspecies or forms I leave to the stromb experts.

Tom Eichhorst, winding down 2009 in New Mexico, USA


-----Original Message-----
From: Conchologists List [mailto:[log in to unmask]]On Behalf Of
Eddy WILMET
Sent: Sunday, December 27, 2009 8:20 AM
To: [log in to unmask]
Subject: [CONCH-L] TIbia


HI,
how can I see the difference
between:
Tibia (Tibia) insulaechorab curta
Tibia (Tibia) insulaechorab insulaechorab
Tibia (Tibia) insulaechorab luteostoma
Regards,

Eddy.

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