The next puzzles were two questions: Are the aplacophoran Solenogastres and Caudofoveata monophyletic or diphyletic?
Within Aplacophora, the separation of Caudofoveata from Solenogastres (which was the original name for both groups, e.g., Thiele, 1913c) and the membership of species in one or the other remains stable and unquestioned.
Here we present new codable morphological characters of two genera in the Solenogastres family Dondersiidae (see Table 2), both for body shape and isolated hard parts--sclerites, radulae, and copulatory spicules--and for internal anatomic characters, particularly those broadly applicable to Solenogastres.
(Mollusca, Aplacophora, Solenogastres) from deep-sea hydrothermal vents.
The digestive tract of Helicoradomenia (Solenogastres, Mollusca), aplacophoran molluscs from the hydrothermal vents of the East Pacific Rise.
Similar ganglionic features have also been described in the ventral and lateral nerve cords of other species in Caudofoveata and Solenogastres (Neomeniomorpha) (Salvini-Plawen, 1972, 1978).
To determine whether the precerebral ganglia of Solenogastres are homologous to those of Chaetoderma or Caudofoveata in general requires immunocytochemical studies in Solenogastres comparable to those presented here.
Solenogastres from the eastern coast of North America.
Studien uber das Integument der Solenogastren, nebst Bemerkungen uber die Verwandtschaft zwischen den Solenogastres und Placophoren.
Ventroplicida Boettger, 1956; Solenogastres Gegenbaur, 1878 [partim], Salvini-Plawen, 1967.
(Mollusca Solenogastres: Proneomeniidae), a new species from the South Shetland Islands (Antarctica).
(= 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.