Rhiostoma jalorense Sykes, 1903
“I have been in some doubt as to whether this is not a local race of R. housei, but the differences are constant in the specimens examined and, I think, are of specific value. The porcellaneous appearance of the operculum, so often seen in this group, appears to be due to the wearing down of the outer layers.” (Sykes, 1903)
Sykes (1903) original descriptions on Rhiostoma jalorensis – “Nearly related to R. housei but larger, slightly more depressed, and with the whorls not so tightly coiled. The tube is long and large, reaching the body of the shell, and is bent slightly backwards at the junction. The disjoined position of the last whorl is much longer than is the case in R. housei, as will be seen from the figure, and is more descending. The colour resembles that of R. housei, and a dark band is usually present at the periphery. Operculum as usual.”
Rhiostoma jalorensis – “Diam. max. 29 millim.” (Sykes, 1903)
Type locality – “Biserat, Jalor” (Sykes, 1903)
Habitat – “Limestone Hills and Caves.” (Sykes, 1903)