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The eggs of many different fish taxa have contributed to this record, including lobe-finned fish, placoderms, and sharks. Occasionally eggs are preserved still within the mother's body, or associated with fossil embryos. Some fossil eggs possibly laid by fish cannot be confidently distinguished from those laid by amphibians. [5]
Subtiliolithus is an oogenus of fossil egg from the Nemegt Formation of Mongolia and the Ohyamashimo Formation of Japan. The eggs are notable for a very thin eggshell. It contains three oospecies: S. hyogoensis, S. kachchhensis and S. microtuberculatus.
Similifaveoloolithus gongzhulingensis is known from nine specimens, including five complete fossil eggs; S. shuangtangensis is known from two complete fossil eggs of the Aptian Quantou Formation. The eggs are spherical and the pores are very numerous and irregular, with a honeycomb-like appearance. They are 11–12 cm in diameter.
Antarcticoolithus is an oogenus of large fossil eggs from the Maastrichtian part of the Lopez de Bertodano Formation of Seymour Island, Antarctica. The genus contains the type species A. bradyi, described by Legendre et al. in 2020. [1] The fossil egg, the first found in Antarctica, was discovered in 2011 by a Chilean team of researchers.
Pair of E. elongatus eggs, Paleozoological Museum of China. Several oospecies of Elongatoolithus are known. They can be broadly divided into two classes based on ornamentation: most oospecies have linear ridges parallel to the long axis of the egg, but some (notably E. sigillarius and E. excellens) a rippled pattern of reoriented ridges transverse to the egg's long axis. [1]
A pair of Macroolithus eggs. Macroolithus eggs are characterized by large size, measuring 16 to 21 cm (6.3 to 8.3 in) long, and by their particularly coarse ornamentation. [1] [2] Their microstructure is not well defined in the literature, [1] but generally follows the typical elongatoolithid pattern: [2] The eggshell is arranged into two structural layers (the mammillary layer and the ...
The eggshell has a smooth surface, and at 25–36 mm thick is thinner than most other eggs of the ratite morphotype. [1] [2] Erosion and recrystallization heavily affect most Ageroolithus specimens, but a few fragments are well enough preserved to observe the microstructure. It has two structural layers with a sharp dividing line between them. [1]
The type specimen of Styloolithus is a fossil clutch of at least four eggs and associated adult remains (probably representing the parent). Several other fossil eggs are also known. The egg clutches are tightly packed together, like Prismatoolithus and Troodontid eggs, in contrast to the loosely scattered nests of enantiornithine birds.