OBO_REL:part_of (UNDECLARED) parhypural Haemal spine of last hemal arch that is pierced by the haemal canal through which the caudal vessels pass or haemal arch of preural centrum 1. Its distal part commonly supports lepidotrichia. The parhypural is an unpaired median haemal spine. TAO:0000438 TAO:0000562 The parhypural is frequently confused with the arch plus spine of preural centrum 1. hemal spine of preural centrum 1 parahypural parhypural (French) parhypural hypaxonal (French) parhyural phy prohypural (French) teleost_anatomy preural 1 vertebra hemal spine