Aplacophora - Wikipedia
Aplacophora / æ p l ə ˈ k ɒ f ər ə / is a presumably paraphyletic taxon. This is a class of small, deep-water, exclusively benthic, marine molluscs found in all oceans of the world. All known modern forms are shell-less: only some extinct primitive forms possessed valves.
ADW: Aplacophora: INFORMATION
Aplacophorans are small, cylindrical, worm-like, and usually less than 5 cm long, but can range from 1 mm to 30 cm. Like other mollusks, it has no outer shell, but the epidermis secretes calcareous spicules or scales which are embedded in dorsal mantle. These spicules give the aplacophorans a sheen.
Welcome to the Aplacophora Home Page - Woods Hole …
The Taxonomy of the Aplacophora (Chaetodermomorpha or Caudofoveata & Neomeniomorpha or Solenogastres), Sclerite-Bearing Deep-Sea Mollusks.
Aplacophora (Aplacophorans) - Encyclopedia.com
Aplacophorans, which are also called solenogasters, are worm-shaped mollusks covered with spicules or sharp needle-like projections. The body shape varies from almost spherical to elongated and slender.
Phylogenomics of Aplacophora (Mollusca, Aculifera) and a …
May 8, 2019 · Here, we present a phylogenetic framework for Aplacophora that differs dramatically from the current taxonomy of the group and describe a remarkable new solenogaster lacking most of the characters traditionally used to diagnose Mollusca, significantly expanding known morphological variation in Aplacophora.
Aplacophora | mollusk class | Britannica
Class Aplacophora Worm-shaped and without shells; marine, mostly in deep water. Possibly representive of the primitive molluscan condition or a secondary reduction from more advanced, shelled ancestors. About 300 species.
A Silurian armoured aplacophoran and implications for ... - Nature
Oct 3, 2012 · A fossil of an aplacophoran from the Silurian of Herefordshire, England, is shown to have armour plating, supporting recent studies that have allied the worm-like, shell-less Aplacophora with...
Chapter 14: Polyplacophora, Monoplacophora, and Aplacophora
14.2.1 Introduction. 14.2.2 Phylogeny and Classification. 14.2.2.1 Sister Group Relationships. 14.2.3 Morphology. 14.2.3.1 Shell and Girdle. 14.2.3.2 Head-Foot, Muscles, and Mantle. …
Aplacophorans: Aplacophora - Encyclopedia.com
Aplacophorans (ah-plak-oh-FOR-ans) are mollusks and are related to clams, mussels, octopuses, and squids. Their worm-shaped bodies range from long and slender to almost ball-shaped and measure between 0.039 and 3.9 inches (1 to 100 millimeters) or more in length. A thick sheet of skin, or mantle, covers their bodies.
Aplacophora - Simple English Wikipedia, the free encyclopedia
The Aplacophora is a class of small, deep-water, exclusively benthic, shell-less marine molluscs. They are found in all oceans of the world. They are a small group of molluscs which have deviated from the normal molluscan form. There …