PBDB Taxon

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Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Elongatoolithus

Osteichthyes - Elongatoolithidae

Taxonomy

Elongatoolithus was named by Zhao (1975). It is considered to be a form taxon.

It was assigned to Oviraptoridae by Zelenitsky and Currie (2004); and to Elongatoolithidae by Zhao (1975), Zeng and Zhang (1979), Zhao (1979), Mikhailov (1991), Zhao et al. (1991), Mikhailov (1994), Mikhailov et al. (1994), Zhao (1994), Mikhailov (1997), Mikhailov (2000), Zelenitsky et al. (2000), Amo Sanjuán et al. (2000), Cousin (2002), Fang et al. (2003), Watabe (2004), Mohabey (2005), Liang et al. (2009), Wang et al. (2010), Zhao et al. (2013), Wang et al. (2013), Huh et al. (2014), Zhang et al. (2017), Simon et al. (2019), Jin et al. (2020), Tanaka et al. (2023), Wang and Wang (2024).

Species

E. andrewsi, E. chichengshanensis, E. chimeiensis, E. elongatus, E. excellens, E. frustrabilis, E. jianchangensis, E. laijiaensis, E. magnus, E. sigillarius, E. subtitectorius, E. taipinghuensis, E. yangjiagouensis

Synonymy list

Year	Name and author
1975	Elongatoolithus Zhao p. 108
1979	Elongatoolithus Zeng and Zhang p. 133
1979	Elongatoolithus Zhao p. 336
1991	Elongatoolithus Mikhailov p. 221
1991	Elongatoolithus Zhao et al. p. 5
1994	Elongatoolithus Mikhailov p. 111
1994	Elongatoolithus Mikhailov et al. p. 103
1994	Elongatoolithus Zhao p. 187
1997	Elongatoolithus Mikhailov p. 62
2000	Elongatoolithus Amo Sanjuán et al. p. 9
2000	Elongatoolithus Mikhailov p. 569
2000	Elongatoolithus Zelenitsky et al. p. 130
2002	Elongatoolithus Cousin p. 43
2003	Elongatoolithus Fang et al. p. 517
2004	Elongatoolithus Watabe p. 17
2004	Elongatoolithus Zelenitsky and Currie p. 134A
2005	Elongatoolithus Mohabey p. 473
2009	Elongatoolithus Liang et al. p. 1590
2010	Elongatoolithus Wang et al. p. 114
2013	Elongatoolithus Wang et al. p. 199
2013	Elongatoolithus Zhao et al. p. 4665
2014	Elongatoolithus Huh et al. p. 220
2017	Elongatoolithus Zhang et al. p. 191
2019	Elongatoolithus Simon et al. p. 7
2020	Elongatoolithus Jin et al. p. 9
2023	Elongatoolithus Tanaka et al. p. 202
2024	Elongatoolithus Wang and Wang p. 40

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
class	Osteichthyes
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida

Rank	Name	Author
class	Reptilia
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Saurischia	()
—	Theropoda	()
family	Elongatoolithidae
genus	Elongatoolithus

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Elongatoolithus Zhao 1975

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†Elongatoolithus andrewsi Zhao 1975

†Elongatoolithus chichengshanensis Fang et al. 2003

†Elongatoolithus chimeiensis Fang et al. 2007

†Elongatoolithus elongatus Young 1954

†Elongatoolithus excellens Mikhailov 1994

†Elongatoolithus frustrabilis Mikhailov 1994

†Elongatoolithus jianchangensis Fang et al. 2007

†Elongatoolithus laijiaensis Fang et al. 2003

†Elongatoolithus magnus Zeng and Zhang 1979

†Elongatoolithus sigillarius Mikhailov 1994

†Elongatoolithus subtitectorius Mikhailov 1994

†Elongatoolithus taipinghuensis Yu 1998

†Elongatoolithus yangjiagouensis Fang et al. 2007

Diagnosis

Reference	Diagnosis
K. E. Mikhailov 1994	Elongated-ellipsoidal eggs of medium size (up to 170 mm long) with "fine" ornamentation on surface (a = 8–11) and typically elongatoolithid microstructure of shell. Ratio of spongiose to mammilar layer ranging from 2:1 to 3:1.
K. E. Mikhailov 1997	Eggs of medium size (long diameter < 170 mm) with a fine linearituberculate ornamentation (8-1 1 lines of ridges per 10 mm range of egg short diameter). Elongation of egg = 2.0-2.2. Thickness ratio between continuous and mammillary layers varies from 2 : 1 to 3 : 1.