endothyra endothyra endothyra is an extinct genus of fusulinid belonging to the family endothyridae. specimens of the genus have been found in carboniferous beds in north america and many other locations in the world. it was a common and widespread rock-forming fusulinid. endothyratemporal range: devonian-triassic~ scientific classification domain: eukaryota clade: diaphoretickes clade: sar phylum: retaria infraphylum: foraminifera class: †fusulinata family: †endothyridae subfamily: †endothyrinae genus: †endothyraphillips 1846 species see text species e. baileyi e. bowmani phillips 1846