Haeckel
Diagnosis: Shell mantle twice as long as wide, its frontal perimeter an isosceles triangle, with triangular excision at base, its sagittal perimeter slenderly ovate. Nasal style twice as long as paired tergal styles, former with 10-12 (10-30, Reshetnjak, 1966), latter with 5-6 alternate-cruciate pairs of lateral branches. Terminal coronets (on free distal ends of styles) palmate, with 10-12 (4-12, Reshetnjak, 1966) spinulate, irregular, finger-shaped branches.
Length: 5.5 mm.