Metambasia Stephensen, 1923: 76.― Dahl, 1959: 217.―J.L. Barnard, 1969: 304, 306, 309, 311, 315 (keys), 350.― Barnard & Karaman, 1991: 503.
Type species. Metambasia faeroensis Stephensen, 1923, by monotypy.
Included species. Metambasia includes one species: M. faeroensis Stephensen, 1923.
Diagnostic description. Antenna 1 flagellum article 1 lacking robust seta on distal margin; accessory flagellum forming cap. Antenna 2 flagellum articles 3–5 slender in female, article 3 enlarged in male; articles 4–5 without brush setae on the anterior margin. Mandibular incisor slightly curved; molar with reduced column and convex triturating surface (button); palp attached midway. Maxilla 1 ST-7 serrate along the entire curved medial margin; ST-D slender, apically cuspidate. Maxilliped outer plate with apical robust setae. Gnathopod 1 parachelate; coxa vestigial; carpus longer than propodus; propodus palm minute, acute. Pereopod 4 coxa with well developed posteroventral lobe. Uropod 2 inner ramus constricted. Uropod 3 rami plumose setae present in male, absent in female. Telson moderately cleft.
Remarks. See remarks under Glorieusella.
Distribution. North Atlantic Ocean.