WebThe interpretation of Kimberella is controversial , but the true stem molluscs probably did have a large, bilaterally symmetrical body with subapical mouth on a snout with a likely bipartite radula , a broad ventral foot, many dorsoventral muscle bundles, and a dorsal mantle covered with a resistant dorsal cuticle with mineralised spicules, which are all … WebADVERTISEMENTS: The following points highlight the six main classes of phylum mollusca. The classes are: 1. Monoplacophora 2. Amphineura 3. Gastropoda 4. Scaphopoda 5. …
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Web22 mrt. 2024 · mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body. Along … WebA. closed circulatory system B. Fluid-filled coelom C. Jointed appendages D. Segmented body E. Tubular gut C. Jointed appendages Four of the five answers listed below are … star wars ewok backpack
Mollusk Definition, Characteristics, Shell, …
WebThe molluscan body, which contains all the visceral elements (such as the digestive tract, gonads, and heart), is connected to the mantle by dorsoventral musculature. The head, when present, has tentacles called captacula in scaphopods, labial palps in bivalves, head tentacles in gastropods, and arms in cephalopods. 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 developed such a varied range of body structures, finding synapomorphies … Meer weergeven 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 … Meer weergeven 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 … Meer weergeven Feeding Most molluscs are herbivorous, grazing on algae or filter feeders. For those grazing, two feeding … Meer weergeven Fossil record Good evidence exists for the appearance of gastropods (e.g., Aldanella), cephalopods (e.g., Plectronoceras, Nectocaris) and bivalves Meer weergeven The words mollusc and mollusk are both derived from the French mollusque, which originated from the Latin molluscus, from mollis, soft. Molluscus was itself an adaptation of Aristotle's τὰ μαλάκια ta malákia (the soft ones; < μαλακός malakós "soft"), … Meer weergeven 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 … Meer weergeven 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 … Meer weergeven WebThe molluscan body, which contains all the visceral elements (such as the digestive tract, gonads, and heart), is connected to the mantle by dorsoventral musculature. The head, … star wars ewok dog sweater with knit hoodie