Catalog of species-group names of Recent and fossil Scaphopoda
A major enigma regarding the comparative structure of the apical sensory organ among gastropod larvae relates to the distinctive long ciliary tuft that is a characteristic component of this larval structure in many other spiralians, including at least some members of the molluscan classes: Scaphopoda
, Polyplacophora, Aplacophora, and Bivalvia (see reviews by Raven, 1966; Verdonk and van den Biggelaar, 1983).
The Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, and Scaphopoda
are exclusively benthic and opaque.
The molecular aspects of trochoblast-specific gene expression in molluscs have been conserved in the Polyplacophora, Scaphopoda
, and Gastropoda.
The Solenogastres (= Neomeniomorpha), Caudofoveata (= Chaetodermomorpha), and Polyplacophora were grouped in the subphylum Aculifera, and the Monoplacophora, Bivalvia, Gastropoda, Scaphopoda
, and Cephalopoda were placed in the subphylum Conchifera.
Systematics of Mollusca in Japan - Bivalvia and Scaphopoda
, Archaeogastropoda and Paragastropoda (Mollusca).