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Reptilia - Prismatoolithidae
Diagnosis. Small-sized, asymmetric ovoid eggs measuring about 7 4 cm, with a smooth eggshell averaging 0.27 mm in thickness, a prismatic eggshell structure with no marked distinction between the mammillary and pali- sade layers, a peculiar prism pattern with a jagged central zone, an incipient squamatic structure and a rather low number of pore openings of variable diameters averaging 15 lm. Eggs sub-vertically oriented in probably two or more layered clutches.
Remarks. Sankofa pyrenaica oogen. nov. oosp. nov. differs from Troodon (Prismatoolithus levis Zelenitsky and Hills 1996) eggs and eggshells by having a less elongated, more asymmetric egg shape, thinner eggshells and a different ultrastructural pattern.
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.