Type locality – “Sadong, West Sarawak” (Pilsbry, 1900)
Other localities – “Mount Sekadau and Mount Dadap, West Borneo” (E.A. Smith, 1895); Kpg. Tapu and Sadong, Sarawak.
Laidlaw & Solem (1961) descriptions on Amphidromus similis – “Shell dextral, whorls 6 1/8 to 6 5/8, yellow ground color, the broad white subsutural zone, the few subsutural brown spots and the purplish-brown parietal callus are distinctive. There is no varix, the umbilicus is closed and the peristome is white. The general color pattern is nearly identical with that of A. atricallosus, but the absence of a varix and the shape suggest that this is a parallel color development and has led to our grouping A. similis with the martensi complex.”
“Mr. A. Everett collected two dextral specimens at Sadong, West Sarawak, one of which Mr. E. A. Smith has figured; neither of them have black varices, and the parietal wall is dark, as in atricallosus. Schepman reports similar specimens from Mt. Sekedau and Mt. Dadap, coll. by Moret, but he mentions that they have brown spots on the white zone near the suture. This form is probably a modification parallel to, rather than genetically connected with A. atricallosus of the mainland, and may be called form similis.” (Pilsbry, 1900)
Amphidromus similis – “High 44-49 mm.” (Laidlaw & Solem, 1961)
“The two dextral specimens belong to the variety named Bulimus atricallosus by Gould, which has founded upon specimens collected in Tavoy, Burmah. B. aques, Pfeiffer, also belongs to this variety. The types appear to have been bleached, either naturally or artificially. Neither of the Sadong examples exhibit any periodic oblique black stripes.” (E. A. Smith, 1895)
“The specimens agree better with Smith's figure than with Reeve's fig. 188. They have brown spots on the white zone near the suture, which are not mentioned in the descriptions at my disposal.” (Schepman, 1896)
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