Didazoonidae
Template:Short description Template:Automatic taxobox
Didazoonidae is a vetulicolian family within the order Vetulicolata. It is characterized by a relatively thin-walled, non-biomineralized body and a large, round anterior opening surrounded by an oral disc.[1][2] It may be paraphyletic,[3] even if the phylum Vetulicolia is monophyletic.[4]
Description
Didazoonids have an ovoid to subquadrate anterior section divided into six subdivisions marked by five circumventing lines perpendicular to the body axis. Cowl-shaped lateral pouches appear along each side of the anterior section, coincident with the five dividing lines. The anterior opening is large, round, and surrounded by a circumventing oral disc. The posterior section has seven segments, which in some species each carry up to six annulations.[2]
Taxonomy
Didazoonidae was erected to group Didazoon. Xidazoon. and Pomatrum, although Xidazoon has since been shown to be a junior synonym of Pomatrum.[1] Yuyuanozoon was moved to the Didazoonidae after additional specimens illuminated more details of the anterior opening and posterior segment annulations.[5]
Nesonektris has also been assigned to Didazoonidae by some workers,[6] but this has not been widely accepted.[7][8]
A 2024 study has found the Didazoonidae (without Nesonektris) to be a paraphyletic grade of the vetulicolians closest to crownward chordates as shown in this simplified cladogram:[3]
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An earlier study in 2014 placed vetulicolians as the sister-group to tunicates, but was unable to resolve any relationships among vetulicolians as a group:[4]
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References
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Works cited
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