Discussion of Phylogenetic Relationships
- Teudopseina †
The monophyly of both suborders is well established. Young and Vecchione (1996) found two apomorphic character states that defined the monophyly of the Incirrata:
- Presence of a cornea.
- Hectocotylization of one of the third arms.
Another character can probably be added to the list of apomorphies although it hasn't been included in a cladistic study:
- Chorion of egg drawn out into a stalk (Young, et al., 1999).
Young and Vecchione (1996) found three character states that defined the monophyly of the Cirrata:
- Spermatophores as sperm packets without ejaculatory apparatus.
- Presence of horizontal arm septa.
- Buccal position of posterior salivary glands.
Voight (1997) also found morphological, cladistic support for the Cirrata and Incirrata but her study is controversial. Carlini (1998) found molecular analyses supported the monophyly of both groups.
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