Haecker
Diagnosis: Spherical skeleton. Galea with triangular oral and aboral surfaces. Aboral surface bridged to inner valve. Rhinocanna near oral margin, bound to galea by two frenula. Two primary lateral tubes and aboral tube each branched 5 to 7 times. Primary tubes with 3 branches at first branching, other branches dichotomous, distal branches typically with very small, irregular teeth.
Diameter: 2.2-2.8 mm.