Assiminea spiralis Brandt, 1974
Diagnosis – “A species of A. (Sculptassiminea) Thiele, which differs from the type species of the subgenus by its very delicate spiral sculpture which is interrupted by the delicate growth lines. The rhachis has only one pair of basal cusps on either side.” (Brandt, 1974)
Brandt (1974) original descriptions on Assiminea (Sculptassiminea) spiralis – “Shell of medium size for the genus, thin, corneous, transparent, conic, of silky lustre, with 6 convex whorls which are separated by a deep suture. The whorls increase regularly in size. The apex is pointed and smooth, the other whorls are sculptured with delicate spiral lines which are crossed by the growth lines. The umbilicus is open. There are neither spiral ridges nor spiral grooves. Aperture rounded, not extended, peristome not continuous, curved and somewhat thickened at the columella, sharp without. Operculum oval, paucispiral, thin, transparent, with subcentral nucleus.”
“Animal lead-grey with black pigmentation dusted over back, head and rostrum. Some dots of whitish pigmentation may be present near the eye-stalks. These are very short and broad at the basa. The eyes are placed in the bases, not on top. The tips of the eye-stalks carry a black pigment dot. The rostrum is short and broad and cleft in the middle. Verge of the male reproductive organs long and bent; it is slowly tapering to the pointed tip. Radula with trapezoidal rhachis which carries 2 or 3 basal cusps on either side and 11 small cusps on the cutting edge. The mesocone is large and was found cleft in the two examined specimens.” (Brandt, 1974)
Assiminea (Sculptassiminea) spiralis – “Size: A 2.3-2.7 mm; D 1.7-1.9 mm.” (Brandt, 1974)
Type locality – “Thailand: about 500 yards W of Ban Pa In.” (Brandt, 1974)
Other localities – “Thailand: Klong Dao Id, Thonburi” (Brandt, 1974)
Distribution – “Thailand: Thonburi, Ayuthia, Samut Prakan, Trang and Satun.” (Brandt, 1974)
Habitat – “Swamp with freshwater under tidal influence” (Brandt, 1974)