Shell shell length up to 10.5 mm; strongly elongate, subcylindrical. Protoconch: of planktotrophic larval type, of 2 smooth whorls; first whorl relatively wide; transition to teleoconch abrupt, with a deep sinusigera notch and with slightly thickened margin. Teleoconch : of about 8 weakly convex to almost flat-sided whorls; adapical spire whorls weakly angulate below periphery; sutures deeply impressed. 6-7 adapical spire whorls with rounded axial ribs; the latter more prominent and less densely spaced on adapical whorls and gradually less prominent, more numerous and more crowded on subsequent spire whorls and eventually very weak to absent on penultimate and last whorls; axial ribs nearly orthocline on abapical spire whorls. Spiral sculpture absent on 3-4 adapical spire whorls; very weak spiral threads in interspaces between axial ribs on subsequent spire whorls; penultimate and last whorl with numerous, crowded, prominent spiral threads, the latter more prominent on abapical half of last whorl. Last whorl with weak, rounded, spiral cord around the base. Aperture: large, D-shaped; columellar side almost straight; inner lip thin; anterior channel very shallow; outer lip thin, slightly expanded, with weakly thickened, narrow, external varix; outer lip weakly opisthocline in profile. Colour: white. Operculum, radula and internal anatomy : unknown.

Moerchiella striolata: Shell: length up to 10.5 mm; strongly elongate, subcylindrical. Protoconch : of planktotrophic larval type, of 2 smooth whorls; first whorl relatively wide; transition to teleoconch abrupt, with a deep sinusigera notch and with slightly thickened margin. Teleoconch : of about 8 weakly convex to almost flat-sided whorls; adapical spire whorls weakly angulate below periphery; sutures deeply impressed. 6-7 adapical spire whorls with rounded axial ribs; the latter more prominent and less densely spaced on adapical whorls and gradually less prominent, more numerous and more crowded on subsequent spire whorls and eventually very weak to absent on penultimate and last whorls; axial ribs nearly orthocline on abapical spire whorls. Spiral sculpture absent on 3-4 adapical spire whorls; very weak spiral threads in interspaces between axial ribs on subsequent spire whorls; penultimate and last whorl with numerous, crowded, prominent spiral threads, the latter more prominent on abapical half of last whorl. Last whorl with weak, rounded, spiral cord around the base. Aperture: large, D-shaped; columellar side almost straight; inner lip thin; anterior channel very shallow; outer lip thin, slightly expanded, with weakly thickened, narrow, external varix; outer lip weakly opisthocline in profile. Colour: white. There appears to be very little or no variation among the small series of specimens of this species available.

There appears to be very little or no variation among the small series of specimens of this species available.
The shell of Rissoina (Moerchiella) striolata very strongly resembles R. (M.) dorbignyi but differs in lacking the nodose axial ribs on the adapical spire whorls and in the whorls being non-angulated; furthermore, R. (M.) striolata has a multispiral protoconch, while the latter is paucispiral in R. (M.) dorbignyi. R. (M.) striolata strongly resembles R. (M.) artensis in shell characters and is contrasted under that species.

Moerchiella striolata: The shell of Rissoina (Moerchiella) striolata very strongly resembles R. (M.) dorbignyi but differs in lacking the nodose axial ribs on the adapical spire whorls and in the whorls being non-angulated; furthermore, R. (M.) striolata has a multispiral protoconch, while the latter is paucispiral in R. (M) dorbignyi. R. (M.) striolata strongly resembles R. (M.) artensis in shell characters and is contrasted under that species.

Type location: Baclayon Island, Philippines. Rissoina (Moerchiella) striolata is only known from the Philippines and from S.E. Papua New Guinea.

Moerchiella striolata: TYPE LOCALITY
Rissoina striolata : Baclayon Island, Philippines.
Rissoina (Moerchiella) striolata is only known from the Philippines and from S.E. Papua New Guinea.