मरीन मोलस्क की छोटी कक्षा जिसमें चिटन शामिल हैं; कभी-कभी सबक्लास अम्फिनुरा का एक आदेश माना जाता है

polyplacophora's Usage Examples:

In Polyplacophora there are eight on each side (8.I.8); in Scaphopoda two on each side (2.I.2); in almost all Cephalopoda three on each side (3.I.3); in Gastropoda the number varies very much in different subdivisions.

C. Haddon, "Report on the Polyplacophora," Challenger Reports.

On this view then the Aplacophora are more primitive than the Polyplacophora in the relations of coelom, gonad and coelomoducts; and the genital ducts of the Chitons have arisen either by metameric repetition within the group, or by the gradual loss of an original connexion between the generative sac and the renal tube, as in Lamellibranchs and Gastropods, the generative sac acquiring a separate duct and opening to the exterior on each side.

According to Paul Pelseneer the Polyplacophora are the most archaic, the Aplacophora being specialized in (1) the great reduction of the foot, (2) the disappearance of the shell (Cryptoplax among the Polyplacophora showing both reductions in progress), (3) the disappearance of the radula.

The chief points in which the Aplacophora differ from the Polyplacophora are: (1) they are worm-like in shape; (2) there is no distinct foot, and the mantle bears no shell-valves, but only numerous calcareous spicules; (3) the digestive tube is straight.

- Ventral aspect of three species of Polyplacophora showing position of gills.

- Polyplacophora Each of the eight valves of the shell is made up of two distinct calcareous layers: (a) an outer or upper called the tegmentum, which is visible externally; (b) a deeper layer called articula FIG.

The Amphineura are divided into two orders: (1) the Polyplacophora, or Chitons; (2) the Aplacophora, or forms without shells, Neomenia, Chaetoderma and their allies.

In the Chitons or Polyplacophora, on the other hand, the two cavities are separate, and there are independent genital ducts.

Orders: Polyplacophora, Aplacophora.

polyplacophora's Meaning':

small class of marine mollusks comprising the chitons; sometimes considered an order of the subclass Amphineura

Synonyms:

class Polyplacophora, genus Chiton, phylum Mollusca, class, Mollusca,

Antonyms:

inelegance,