Oofamily of fossil eggs
Stalicoolithidae is an oofamily of fossil eggs.
History.
Stalicoolithid eggs were first discovered in 1971, but they were described initially as Dendroolithids, or as Spheroolithids, in the case of ""Paraspheroolithus" shizuiwanensis" and "Shixingoolithus".
Description.
Stalicoolithids are distinguished from other oofamilies by several characteristics. Most significantly, they have secondary eggshell units in the outer zone, and three distinct subzones of the columnar layer. They have a unique mix of developmental characteristics, giving insight into the evolution of the amniotic eggshell.
Parataxonomy.
Stalicoolithidae contains at least three oogenera: "Coralloidoolithus", "Stalicoolithus", and "Shixingoolithus". "Shixingoolithus" contains two oospecies: "S. erbeni" and "S. qianshanensis". Also, the enigmatic "Parvoblongoolithus" could potentially be a stalicoolithid.
References.
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