{{Short description|Family of acorn worms}} {{Automatic taxobox |image = Fig 1 - Adult Schizocardium californicum.png |image_caption = Adult ''Schizocardium californicum''. (a) Female. (b) Male |taxon = Spengelidae |authority = |synonyms = Spengeliidae }}
'''Spengelidae''' is a family of worms belonging to the class Enteropneusta, order unknown.<ref name="GBIF">{{cite web |title=Spengelidae |url=https://www.gbif.org/species/1906 |website=www.gbif.org |access-date=10 June 2021 |language=en}}</ref> The larvae of one of its species, ''Schizocardium californicum'', are known for not expressing Hox genes.<ref>{{cite journal | vauthors = Hejnol A, Vellutini BC | title = Larval Evolution: I'll Tail You Later… | journal = Current Biology | volume = 27 | issue = 1 | pages = R21–R24 | date = January 2017 | pmid = 28073016 | doi = 10.1016/j.cub.2016.10.057 | doi-access = free | bibcode = 2017CBio...27..R21H }}</ref>
Genera:<ref name="GBIF" /> * ''Glandiceps'' <small>Spengel, 1891</small> * ''Mazoglossus'' <small>Bardack, 1997</small> * ''Schizocardium'' <small>Spengel, 1893</small> * ''Spengelia'' <small>Willey, 1898</small> * ''Willeyia'' <small>Punnett, 1903</small>
==References== {{Reflist}}
{{Taxonbar|from=Q3813791}} {{Hemichordate-stub}} Category:Acorn worms