Elongatoolithidae Zhao, 1975

Wang, Qiang, Zhao, Zikui, Wang, Xiaolin, Li, Ning & Zou, Songlin, 2013, A new form of Elongatoolithidae, Undulatoolithus pengi oogen. et oosp. nov. from Pingxiang, Jiangxi, China, Zootaxa 3746 (1), pp. 194-200 : 194-195

Elongatoolithidae Zhao, 1975

Diagnosis: Elongate, asymmetrical eggs; paired eggs arranged in a circular clutch; the polar axis length from 10.0 cm–21.0 cm, and equatorial diameter from 5 cm – 9 cm, prominent nodes or ridges ornamentation on the outer surface; eggshell composed of the cone layer and the columnar layer, eggshell thickness ranges from 0.30 mm –2.00 mm.

Type oogenus: Elongatoolithus , Macroolithus, Nanhsiungoolithus ( Zhao 1975) , Heishanoolithus ( Zhao & Zhao, 1999) , Paraelongatoolithus ( Wang et al. 2010) , Trachoolithus ( Mikhailov 1994, 1997), and Ellipsoolithus ( Mohabey 1998) .