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(Haeckel, 1887)

Two equatorial spicules largest, cylindrical or slightly swollen in the middle - spindle-shaped, sometimes slightly compressed, 4-sided in cross section; distal part tapering, tips blunt, rounded. Other 2 equatorial spicules shorter but wider, may bear 2 longitudinal keels in the distal part, in which case they are pyramidal, or may be sword-shaped. Sixteen secondary spicules shorter than equatorial, tapering distally, compressed, two-edged, tips sharp; may be all alike, or 8 polar may be slightly shorter and thinner than 8 tropical. Leaf-star very large, occupying almost entire central capsule. Length of larger equatorial spicules: 0.1 mm, smaller: 0.08 mm; secondary spicules: 0.06 mm; breadth of leaf-cross: 0.06 by 0.04 mm.

Lonchostaurus rhombicus