The phylum is typically divided into 7 or 8 [6] taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates —and either the giant squid or the colossal squid is the largest known invertebrate … See more Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks . Around 85,000 extant species of molluscs are recognized. The number of fossil … See more The most universal features of the body structure of molluscs are a mantle with a significant cavity used for breathing and excretion, and the organization of the nervous system. Many have a calcareous shell. Molluscs have … See more Because of the great range of anatomical diversity among molluscs, many textbooks start the subject of molluscan anatomy by describing what is called an archi-mollusc, hypothetical generalized mollusc, or hypothetical ancestral mollusc (HAM) to illustrate the most … See more Opinions vary about the number of classes of molluscs; for example, the table below shows seven living classes, and two extinct ones. Although they are unlikely to form a clade, some older works combine the Caudofoveata and Solenogasters into one class, the See more The words mollusc and mollusk are both derived from the French mollusque, which originated from the Latin molluscus, from mollis, … See more Estimates of accepted described living species of molluscs vary from 50,000 to a maximum of 120,000 species. The total number of described species is difficult to estimate because of unresolved synonymy. In 1969 David Nicol estimated the probable total … See more Feeding Most molluscs are herbivorous, grazing on algae or filter feeders. For those grazing, two feeding … See more WebThere are four major groups within the phylum Mollusca: Class Polyplacophora consists of chitons, snail-like molluscs with eight-part overlapping scale shells (Fig. 3.51 A).; Class Bivalvia are molluscs with hinged two-part shells (Fig. 3.51 C). Examples include clams, oysters, mussels, and scallops. Class Cephalopoda are molluscs with large heads, large …
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WebNov 14, 2024 · There are many types of mollusk organisms in these classes. The three main groups of mollusks that are most important to consider are gastropods and cephalopods. Pin. Gastropods. The largest class of mollusks is Gastropoda. It includes over 70,000 species. Gastropods can be found on land, in freshwater, and in marine areas. WebApr 6, 2024 · Even in the egg-laying monotremes, the duck-billed platypus seems to play. In fact, data strongly suggest that some animals from many other groups, including reptiles, fishes, insects, mollusks, and spiders can and do play. Since this may seem a rather bold, if not unsettling, claim, here are a few examples. little beach boathouse
Mollusks and Annelids – Introductory Biology: …
WebNov 14, 2024 · There are four main classes of mollusks: Gastropoda (Gastropoda), Bivalvia, Cephalopoda, and Polyplacophora. There are many types of mollusk organisms in these … WebThere are only 6 species of the Nautilus family still alive today, although the fossil record tells us that there were once many. Nautilus family members are similar to other … Web6 Main Classes of Phylum Mollusca Zoology Class # 1. Monoplacophora: Class # 2. Amphineura: Class # 3. Gastropoda: Class # 4. Scaphopoda: Class # 5. Pelecypoda or Bivalvia or Lamellibranchiata: Class # 6. Cephalopoda: What are the 5 … little beach boat house