Rissoina striata: Shell: length up to 19.6 mm, elongately conical; last whorl weakly to moderately contracted near the base. Protoconch : broken or covered by calcareous deposition in all specimens available. Teleoconch : of about 9, weakly convex whorls; sutures weakly impressed. Spire whorls with weak, distantly spaced, narrow, axial ribs, with wider interspaces; axial ribs gradually weaker and more closely spaced on penultimate whorl and on adapical part of last whorl, but absent on abapical part of last whorl; spire whorls and last whorl with spiral ribs, the latter more prominent on adapical spire whorls and gradually less prominent, more numerous and more densely and more irregularly spaced on subsequent spire whorls and on last whorl; spiral ribs intersecting axial ribs, forming weak, rounded nodules on intersection points. Aperture : moderately large, D-shaped; inner lip thin, weakly thickened near transition to anterior channel; the latter narrow, shallow; posterior channel very short, rounded posteriorly, parallel-sided; outer lip thin, moderately opisthocline in profile, with weak, narrow external varix, bearing the same sculpture as remaining part of last whorl; spiral sculpture on outer lip giving the latter a weakly crenulated appearance. Colour : white throughout. Operculum typical of genus with opercular peg open over all of its length.

Shell : length up to 19.6 mm, elongately conical; last whorl weakly to moderately con¬tracted near the base. Protoconch : broken or covered by calcareous deposition in all specimens available. Teleoconch : of about 9, weakly convex whorls; sutures weakly impressed.
Spire whorls with weak, distantly spaced, narrow, axial ribs, with wider interspaces; axial ribs gradually weaker and more closely spaced on penultimate whorl and on adapical part of last whorl, but absent on abapical part of last whorl; spire whorls and last whorl with spiral ribs, the latter more prominent on adapical spire whorls and gradually less prominent, more numerous and more densely and more irregularly spaced on subsequent spire whorls and on last whorl; spiral ribs intersecting axial ribs, forming weak, rounded nodules on intersection points. Aperture : moderately large, D-shaped; inner lip thin, weakly thickened near transition to anterior channel; the latter narrow, shallow; posterior channel very short, rounded posteriorly, parallel-sided; outer lip thin, moderately opisthocline in profile, with weak, narrow external varix, bearing the same sculpture as remaining part of last whorl; spiral sculpture on outer lip giving the latter a weakly crenulated appearance. Colour; white throughout.
Operculum: typical of genus with opercular peg open over all of its length

Rissoina striata: The spiral sculpture on the last whorl is rather variable, ranging from moderately prominent spiral ribs to weak spiral ribs with very fine, densely spaced, spiral threads between. The shell of Rissoina (Moerchiella) striata most closely resembles R. (M.) gigantea and is contrasted under that species.

Rissoina grandis PHILIPPI may be conspecific with R. (M.) striata, but the original description, which is not accompanied by any illustration, could be applied to both R. (M.) striata and R. (M.) gigantea; the whereabouts of the type material of PHILIPPI’S species are unknown. SOWERBY (1830) provides an illustration of Rissoa reticulata without giving any further description or shell dimensions and without mentioning the type locality. The illustration strongly resembles the type material of Rissoa striata, but since the lack of any further information about this species and since the type material appears to be lost, Rissoina reticulata is only tentatively included in the synonymy of R. (M.) striata. Very probably the disjunct distribution (no records between Madagascar and Singapore) is the result of poor collecting in the intervening areas; there is no reason to doubt about the exact locality of the specimen reported from Madagascar.
TRYON (1887) includes Rissoina elegantula and Rissoina mohrensterni in the synonymy of Rissoa striata; examination of the type material of those species, however, reveals that they both belong to Rissoina s.s.

Rissoina striata: Indian Ocean and tropical western Pacific as far east as Vanuatu

Indian Ocean and tropical western Pacific as far east as Vanuatu