Stalicoolithidae Explained

Stalicoolithidae is an oofamily of fossil eggs.^[1]

History

Stalicoolithid eggs were first discovered in 1971, but they were described initially as Dendroolithids,^[2] 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.^{[3] [4]} Also, the enigmatic Parvoblongoolithus could potentially be a stalicoolithid.

Notes and References

1. Wang Q, Wang X L, Zhao Z K, and Jiang Y G. (2012). "A new oofamily of dinosaur egg from the Upper Cretaceous of Tiantai Basin, Zhejiang Province, and its mechanism of eggshell formation" Chinese Science Bulletin. 57: 3740-3747. doi: 10.1007/s11434-012-5353-2
2. Zhang, S., X. Jin, J.K. O'Conner, M. Wang, and J. Xie. (2015). "A new egg with avian egg shape from the Upper Cretaceous of Zhejiang Province, China." Historical Biology 27(5):595-602.
3. Moreno-Azanza, M., J.I. Canudo, and J.M. Gasca. (2014). "Spheroolithid eggshells in the Lower Cretaceous of Europe. Implications for eggshell evolution in ornithischian dinosaurs." Cretaceous Research 51:75-87.
4. He . Qing . Chen . Zhong-Liang . Zhang . Shu-Kang . Gui . Ze-Wen . Chen . Ya-Ting . 2022-08-25 . A new oospecies of Shixingoolithus (Shixingoolithus qianshanensis oosp. nov.) from the Qianshan Basin, Anhui Province, East China . Journal of Palaeogeography . 11 . 4 . 629–639 . en . 10.1016/j.jop.2022.08.001 . 2095-3836. free .