Why are chitons called Polyplacophora?
The Polyplacophora’s common name is chitons, with the name of this group meaning “bearer of many plates”. A chiton’s shell consists of eight separate plates that overlap to form a shell like a coat of armour along the upper surface of its flat oval body.
What makes a Polyplacophora?
The main characteristics of Polyplacophora include (1) elongate or oval, dorsoventrally flattened, bilaterally symmetrical, marine; (2) with dorsal shell of eight plates embedded in a tough mantle; (3) mantle-edge stiffened (called the girdle); (4) large, muscular, ventral foot (girdle and foot can act as suction cup); …
Is Polyplacophora a Marine?
Marine Life Known as Chitons
The term Polyplacophora refers to a class of marine life that are part of the mollusk family. The tongue-twisting word is Latin for “many plates.” The animals in this class are commonly known as chitons and they have eight overlapping plates, or valves, on their flat, elongated shells.
Does Polyplacophora have a shell?
The Polyplacophora, or chitons, differ from all other mollusks in several anatomical particulars. The most striking is that the shell consists of eight somewhat overlapping calcareous plates or valves (Fig. 1) instead of a single shell or pair of shells, as in the gastropods and the bivalves.
What does the name Polyplacophora mean?
Definition of Polyplacophora
: an order of Amphineura comprising the chitons all of which have the foot occupying the whole ventral surface of the body and the shell composed of eight calcified dorsal plates.
What are some examples of Polyplacophora?
ChitonidaNeoloricataLeptochito…MopaliidaeOnithochitonChitonina
Chitons/Lower classifications
What are examples of Polyplacophora?
Which is the most common member of the class Polyplacophora?
So, the correct answer is ‘ Chiton.
Do Polyplacophora have mantles?
The mantle skirt extends around the whole periphery of the animal as a girdle (Polyplacophora-transverse sec.). The ventral surface is mainly occupied by the muscular foot, which is surrounded by the mantle cavity.
How many eyes do Polyplacophora have?
Their underlying layers seem to be hard and thick, so that any damage doesn’t penetrate fully. And chitons have up to 1,000 eyes and can grow more throughout their lifetimes, replacing any that are damaged.
How do you say Polyplacophora?
How to pronounce Polyplacophora – YouTube
Where are Polyplacophora found?
Most live in the rocky intertidal zone or shallow sublittoral (just below the low tide level), but some live in deep water to more than 7000 m. A few species are associated with algae and marine plants, and in the deep sea, waterlogged wood is a common habitat for one group.
How many species of Polyplacophora are there?
Polyplacophorans include about 600 extant species. Entirely marine, they inhabit hard bottoms and rocky coasts in all of the world’s oceans. Although commonly intertidal, living chitons have been dredged from waters as deep as 7000 m.
Why do chitons have 8 plates?
Some species have larger, direct-developing eggs that are brooded in the female’s mantle cavity, from which a juvenile chiton is formed. The shell gland develops with seven regions on the dorsum of the juvenile; the seventh band divides later to form an eighth. Thus, eight shell plates are formed.
How do you say Monoplacophora?
How To Say Monoplacophora – YouTube
How do you pronounce Scaphopoda?
How To Say Scaphopoda – YouTube
What is a Bidarki?
“Bidarki” is a common name for species of chiton that is common in suitable rocky intertidal habitat of Southcentral Alaska. This name reflects the history of the area: “bidarki” is the Russian word for the type of boat that that the animal resembles when it curls up into a defensive half-circle.
How do you pronounce Aplacophora?
How To Say Aplacophora – YouTube
How do you pronounce Pelecypoda?
How To Say Pelecypoda – YouTube
How many chitons exist?
Although known since the early Paleozoic, chitons do not show a marked increase in diversity until the Cretaceous. Chitons occur worldwide in intertidal habitats and at depths in excess of 7000 m. There are about 850 species and they live on a variety of firm substrates ranging from rocks to algae.
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.
What is the meaning of Pelecypoda?
noun. 1. any mollusk of the class Pelecypoda (Lamellibranchiata), characterized by a bivalve shell enclosing the headless body and lamellate gills, comprising the oysters, clams, mussels, and scallops. adjective.
What is an example of Aplacophora?
Among those there are the snails and slugs (Gastropoda), mussels and clams (Bivalvia), scaphopods (Scaphopoda) and squids, octopuses and cuttlefish (Cephalopoda). The bivalve shell only divided itself into two halves but later in evolution.
…
Shell-less Molluscs (“Aplacophora”)
| Class | Species No. |
|---|---|
| Molluscs (Mollusca) | 55.400 |
How do you pronounce Pelecypods?
Also pel·e·cyp·o·dous [pel-uh-sip-uh-duhs].
What are examples of Scaphopoda?
DentaliumDentaliidaDentaliidaeGadilidaGadilidaeFissidental…
Tusk shell/Lower classifications