WoRMS - World Register of Marine Species - Nemertopsis flavida ...
MarBEF Data System - ERMS - Nemertopsis Bürger, 1895
Ultrastructure and phylogenetic significance of spermatozoa
MarBEF Data System - ERMS - Emplectonematidae Bürger, 1904
Tetrastemma Ehrenberg, 1831 - World Register of Marine Species
Nemertopsis - taxref.mnhn.fr
WoRMS - World Register of Marine Species - Tetrastemma …
IRMNG - Emplectonematidae