Myxinikela siroka my·xi·ni·kelasiroka uncommon noun 1. fossil hagfish of the Pennsylvanian period (c. 300 million years ago) that resembled modern hagfishes SynonymsMyxinikela siroka Related words Broader terms hagfish Parts Myxinikela WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.