The Echinoid Directory

Family Laganidae Desor, 1858, p. 217

Diagnosis	Laganiformes with: internal buttressing of circumferential partitions and branched radial bars; periproct adoral, opening bounded by first and second post-basicoronal paired interambulacral plates - the first plates being elongate; interambulacral zones terminating adapically in a single plate; basicoronal circlet pentagonal to pentastellate with ambulacral plates projecting (points of pentagon perradial); food grooves present; unbranched and perradial; apical disc pentagonal, with points of pentagon interradial.
Range	Eocene to Recent; worldwide.

Diagnosis

Laganiformes with:

internal buttressing of circumferential partitions and branched radial bars;
periproct adoral, opening bounded by first and second post-basicoronal paired interambulacral plates - the first plates being elongate;
interambulacral zones terminating adapically in a single plate;
basicoronal circlet pentagonal to pentastellate with ambulacral plates projecting (points of pentagon perradial);
food grooves present; unbranched and perradial;
apical disc pentagonal, with points of pentagon interradial.

Range

Eocene to Recent; worldwide.