Ctenocystoidea
Ctenocystoidea is an extinct clade of echinoderms, which lived during the Cambrian and Ordovician periods. Unlike other echinoderms, ctenocystoids had bilateral symmetry, or were only very slightly asymmetrical. They are believed to be one of the earliest-diverging branches of echinoderms, with their bilateral symmetry a trait shared with other deuterostomes. Ctenocystoids were once classified in the taxon Homalozoa, also known as Carpoidea, alongside cinctans, solutes, and stylophorans. Homalozoa is now recognized as a polyphyletic group of echinoderms without radial symmetry. Ctenocystoids were geographically widespread during the Middle Cambrian, with one species surviving into the Late Ordovician.
Q123509
extinct
Concept
Q713623
clade
Concept
Q44631
echinoderm
Concept
Q79064
Cambrian
TIME
Q62100
Ordovician
LOC
Q598159
bilateral symmetry
Concept
Q150866
deuterostome
Concept
Q138052
Homalozoa
Concept
Q56317648
cinctans
MISC
Q56317646
solutes
MISC
Q3323202
stylophorans
Concept
Q1276038
Middle Cambrian
ORG
Q62100
Late Ordovician
LOC
Q5792856
Ctenocystoidea
Concept
parent taxon
follows