However, Sigwart and Sutton (2007) conducted a cladistic morphological analysis including polyplacophoran fossils and, for the first time, resolved a monophyletic Aculifera as Aplacophora plus Polyplacophora.
Within Aplacophora, the separation of Caudofoveata from Solenogastres (which was the original name for both groups, e.
Use of birefringence to characterize Aplacophora sclerites.
a Pacific hydrothermal vent Aplacophora (Mollusca: Neomeniomorpha).
The cuticle of the Aplacophora
and its evolutionary significance in the Mollusca.
The Mollusca, Part 1: Aplacophora
, Polyplacophora, Scaphopoda, Bivalvia and Cephalopoda, P.
To address homologies between the ganglia of Aplacophora
and other molluscan groups, more comprehensive ontogenetic and comparative studies are needed, since adult caudofoveates entirely lack a pedal sole and it is uncertain whether the posterior part of the head region of chaetoderms may correspond to the pedal region of other molluscan groups.
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).
, Monoplacophora, Polyplacophora, Bivalvia, and Scaphopoda are exclusively benthic and opaque.
Ten species in five genera and three families from continental shelf and deep-sea collections of neomenioid Aplacophora
(Mollusca) are described, emphasizing external anatomy and hard parts--body shape, radula, epidermal spicules, and copulatory spicules--as well as the reproductive system.
This has only once been reported in Patelloidea (Azevedo, 1981), but it also occurs among Aplacophora
and Polyplacophora (Buckland-Nicks, 1995), as well as some Caenogastropoda (Giusti and Mazzini, 1973).