Fossil Fusulinid - Yabeina globosa

Fusulinids are protists from the phylum granuloreticulosa, and the class foraminifera, also called foraminiferida. What does this mean? Granuloretuculosa means that they are cells that fuse to form networks of cells. Foraminifera means it has a "test", or internal skeleton with pores on the outside, through which it feeds with reticulopodia, which are much like the pseudopods of amoebas but are smaller and more hair-like. These protists are common throughout the geological record and are often used as a reference for dating rocks. The fusilinid that I have is a beautiful example of a foraminiferid, or foram for short. Below are several fusulinids in cross-section that have been polished to show their details.

About this specimen

This is a specimen of several Yabeina globosa from the Upper Permian, Kinsho-zan, Akasaka, Gifu, Japan. Kinsho-zan means Mountain Kinsho, or just Mount Kinsho. Akasaka is the town near where it was found, and Gifu is the district.

My fossil fusulinid

(above) Polished section of rock with the fusulinids and a close-up of a fusilinid cross-section. (below) An un-polished section with the fusulinid on the right still partially rounded.

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