Assertion: chordate | /r/HasProperty | et al.
Facets:
Source sentences:
text: Metaspriggina from the Middle Cambrian Burgess Shale (Simonetta and Insom, 1993) is erected to receive the only poorly-preserved specimen preserved with a series of anteriorly pointing V-like structures, that were interpreted as muscle blocks of a chordate (Briggs et al., 1994).