Although morphologically similar to the basin's other three surviving rocksnail species, the plicate rocksnail is genetically distinct.
22.
The shell contains seven columella is heavy, bituberculate at its base, and bounded by a radiately plicate cordon.
23.
These pseudobulbs carry on their top 6 to 7, narrowly ligulate-lanceolate, acute, plicate, leathery leaves.
24.
The eastern hilly region has a plicate structure and is composed of Lower Paleozoic sedimentary-metamorphic rock series and granite.
25.
The periphery contains a row of small nodules produced by the anal sinus, terminating short, low, flexuous plicate ribs.
26.
They may be concave, convex, or undulate, with their edges folded along sinuses, but never sinuous to plicate.
27.
It can grow to be up to over a meter in height and has alternate, plicate leaves the length of the stem.
28.
The suture is bimarginate, above by a minute threadlet, below by a broad and heavy cord which is obliquely irregularly plicated.
29.
The mouth is always provided with a jaw, which is striate, ribbed, sulcate or plicate, sometimes composed of several imbricating pieces.
30.
This species is separated from all others in this genus by the scalariform spires, strongly plicate upper surface, and the deep channel encircling the periphery.
