Protozoa - Spumellaria - Orbiculiformidae

Named by Dumitrica.

Original diagnosis: Test spongy, circular with a large central depression, a rounded sloping periphery and a thick spongy circular ridge between the two.

Original description: Test spongy, circular with a wide central depression bordered by a thick, high, spongy circular ring which is hemispherical in transverse section. Periphery of disc beyond the ring sloping resulting in a round-angled circular band without solid spines but having ine spinules. Meshwork of test with rounded polygonal meshes which are larger on the thick ring decreasing in size on the periphery.

Original remarks: This species is well distinguished from other species of the genus by its larger size and the presence of a thick circular ring between the central depression and sloping periphery.

Etymology: From the Latin medius in the middle and circus circle; noun.

Full reference: S. Gorican, E. S. Carter, P. Dumitrica, P. A. Whalen, R. S. Hori, P. De Wever, L. O'Dogherty, A. Matsuoka, and J. Guex. 2006. Catalogue and systematics of Pliensbachian, Toarcian and Aalenian radiolarian genera and species 446

Belongs to Orbiculiformella according to S. Gorican et al. 2006

Sister taxa: Orbiculiformella callosa, Orbiculiformella incognita, Orbiculiformella teres, Orbiculiformella trispina

Type specimen: 1662D-R09-05. Its type locality is Gümüslü, sample 1662D, which is in a Pliensbachian basinal (carbonate) limestone in the Sögütlü dere Formation of Türkiye.

Ecology: passively mobile planktonic omnivore

Distribution: found only at Gümüslü, sample 1662D

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Specimen images are retrieved through the ePANDDA API.