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).
Published as part of 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, pp. 194-200 in Zootaxa 3746 (1) on pages 194-195, DOI: 10.11646/zootaxa.3746.1.9, http://zenodo.org/record/5271550
{"references":["Zhao, Z. K. (1975) The microstructure of dinosaurian eggshells of Nanhsiung Basin, Guangdong Province (I): On the classification of dinosaur eggs. Vertebrata PalAsiatica, 13 (2), 105 - 117. [in Chinese]","Zhao, H. & Zhao, Z. K. (1999) A new form of elongatoolithid dinosaur eggs from the Lower Cretaceous Shahai Formation of Heishan? Liaoning Province. Vertebrata PalAsiatica, 37 (4), 278 - 285. [in Chinese with English summary]","Wang, Q., Wang, X. L., Zhao, Z. K. & Jiang, Y. G. (2010) A new oogenus of Elongatoolithidae from the Upper Cretaceous Chichengshan Formation of Tiantai Basin, Zhejiang Province. Vertebrata PalAsiatica, 48 (2), 111 - 118. [in Chinese with English summary]","Mikhailov, K. E. (1994) Theropod and protoceratopsian dinosaur eggs from the Cretaceous of Mongolia and Kazakhstan. Paleontological Journal, 28 (2), 101 - 120.","Mikhailov, K. E. (1997) Fossil and recent eggshell in amniotic vertebrates: fine structure, comparative morphology and classification. Palaeontology, 56, 1 - 80. http: // dx. doi. org / 10.1017 / s 0016756898591509","Mohabey, D. M. (1998) Systematics of Indian Upper Cretaceous dinosaur and chelonian eggshells. Journal of Vertebrate Paleontology, 18 (2), 348 - 362. http: // dx. doi. org / 10.1080 / 02724634.1998.10011063"]}