What are examples of Monoplacophora?
Monoplacophora
- Mollusca.
- Gastropoda.
- Bivalvia.
- Polyplacophora.
- Scaphopoda.
- Molluscs.
- Teuthida.
- Snails.
Is Monoplacophora extinct?
Extant representatives were not recognized as such until 1952; previously they were known only from the fossil record, and were thought to have become extinct 375 million years ago….Monoplacophora.
| Monoplacophora Temporal range: | |
|---|---|
| Phylum: | Mollusca |
| Subphylum: | Conchifera |
| Class: | Monoplacophora Odhner, 1940 |
What makes Monoplacophora unique?
Monoplacophorans are unusual because of the combination of primitive characteristics that they possess. In addition to the single, cap-shaped shell, they have paired multiple organs, reflecting at least partial segmentation (metamerism).
How do Monoplacophora feed?
Diet: They scrape up bits of minerals, plants, animals, and other organisms that settle on the sea bottom. Behavior and reproduction: Nothing is known about their behavior or reproduction.
What is the habitat of Monoplacophora?
Monoplacophorans are found on both soft bottoms and hard substrates on the continental shelf and seamounts, generally in the very deep sea. However, some Paleozoic taxa are associated with relatively shallow water faunas (greater than 100 m), indicating that their relegation to the deep sea is a more recent phenomenon.
What do Aplacophora eat?
All aplacophoran molluscs exclusively live in the sea, caudofoveatans living on the ocean floor feeding on micro-organisms and detritus, solenogasters living and feeding on corals and other cnidarians. Many solenogasters (Epimenia babai) live and feed on corals.
Do Aplacophora have a radula?
The internal anatomy provides evidence of the molluscan identity of aplacophorans. In both groups the anterior end of the alimentary system includes a radula and odontophore (the radula’s muscular support).
Does Caudofoveata have radula?
Despite this diversity, key characters of this group are an epithelial derived mantle that can secrete shell(s) or spicules, a foot that develops from body wall muscles, and a radula, a feeding structure that is not present in bivalves (Fig. 9.1). Figure 9.1. Mollusca phylum.
How many valves do Monoplacophora have?
(The other two layers are a very thin, inconspicuous organic layer covering the upper surface of the protein coat and a second calcareous layer that lies below the mineral layer.) Each of the eight valves is arched dorsally and, as in most chitons, overlaps the valve behind it. This overlap forms an articulating shell.
Do Aplacophora have a mantle?
Aplacophora is a relatively small group of molluscs that are characterized by their lack of shells and worm-like appearance. Instead of a shell, their mantle secretes tiny calcareous spicules which give them a beautiful shine.
Where are Monoplacophora found?
What is the meaning of Aplacophora?
Definition of Aplacophora : an order of Amphineura comprising wormlike mollusks in which the body is without calcareous plates but the mantle bears numerous calcified spicules over its entire surface.