Genus Rectogordiopsis gen. nov.

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Type species

Rectogordiopsis kamuranaeformis gen. et sp. nov.

Etymology

From the Latin ‘ rectus ’ (= ‘straight’) because of the many planispiral coils and the Latin ‘ gordiopsis ’ because of the similarity to the genus Hemigordiopsis Reichel, 1945.

Description

Test free, very large and globular. Proloculus spherical followed by a tubular undivided chamber. First whorls numerous tightly streptospiral and following whorls planispiral involute. Flosculinisation well developed. Thick porcelaneous wall often neosparitized with perforations (comb teeth-shaped). Aperture simple terminal.

Comparison

Rectogordiopsis gen. nov. differs from the other genera of the Neodiscidae by the type of coiling (initially glomospiral and finally planispiral) involute test, the well-developed flosculinisation, the long streptospiral initial stage and devoid of buttresses. It differs from the morpholocically closest genus Kamurana by a larger and more globular test with planispiral involute coiling without any oscillation in the last whorls. It is also similar to Globidiscus but differs by the last whorls not tapering. Hemigordiopsis can be easily differentiated from the new genus Rectogordiopsis by the varying test shape (globular to discoidal), the very dark or even black porcelaneous wall, the absence of a comb teeth-shaped structure on the wall and a very low and broad lumen.

Included species

Rectogordiopsis kamuranaeformis gen. et sp. nov., R. ovaliformis gen. et sp. nov.

Range and distribution

Middle Permian (late Capitanian) of the Elmadağ Olistostrome, Ankara City, Central Türkiye.