Collar membranelles

Collar membranelles

Taxonomic markers

ciliate

Definition

The collar membranelles form a closed zone on the peristomial rim and constitute the anterior portion of the oral primordium in early dividers. They have larger polykinetids and longer cilia than the buccal membranelles. Some collar membranelles are elongated into the eccentric buccal cavity (praeorale Membranellen, Foissner and Wilbert 1979; Buccalmembranellen, Blatterer and Foissner 1990; somatic
adoral membranelles, Foissner and O’Donoghue 1990). Although there are several other names for these
membranelles (adorale Pectinellen, Entz 1909b; Membranulae, Entz 1929; Peristomal-Pektinellen, Entz
1937; adoral membranelles, Foissner and Wilbert 1979, Foissner and O’Donoghue 1990, Petz and Foissner
1993; external membranelles, Petz et al. 1995), the term “collar membranelles” is chosen, as it clearly explains the position of the membranelles and can also be used for the large membranelles in the Halteriida and Oligotrichida. Agatha and Riedel-Lorjé (2006).