Mayorella marianaensis is a species of amoebozoan protist discovered in 2023 in Mariana Trench sediments. It belongs to the order Dermamoebida, a group of naked amoebae with a thick glycocalyx.
Cells of Mayorella marianaensis were isolated and cultivated from deep-sea sediments at a depth of 3,144 meters in the vicinity of the Mariana Trench, in the Pacific Ocean. The culture was characterized as a new Mayorella species through morphological and phylogenetic analyses using SSU rRNA genes. The results were published by Xiaoli Lei, Xiaojuan Chen, Jianming Chen and Chen Liang in the journal Protist in June 2023.
Mayorella marianaensis locomotive cells have an average width of 74 üm and length of 28 üm. In addition there are three floating forms identified. The most common floating form is an irregular sphere of 25âÂÂ47 üm in diameter. The second floating form has between 18 and 25 very small pseudopodia (around 9âÂÂ30 üm in length), while the third has about 6 to 9 thin and radiating pseudopodia (around 25âÂÂ125 üm in length). The cell coat (or cuticle) outside of the plasma membrane is around 190 to 290 nm thick and consists of two layers: an outer layer, loosely arranged, with its surface covered with hairs called glycostyles; and an inner layer, closely arranged in stripes.