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Holothuroidea - Apodida - Synaptitidae
It was replaced with Synaptellus by Deflandre-Rigaud (1962).
It was assigned to Holothuroidea by Deflandre and Deflandre-Rigaud (1948); to Synaptidae by Deflandre-Rigaud (1949) and Deflandre-Rigaud (1952); to Synaptitidae by Frizzell and Exline (1966) and Henderson et al. (1992); and to Apodida by Sepkoski (2002).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.