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#cephalopods

2 public questions tagged with this topic.

Animal Classification

Foot is modified into tentacles in

In Mollusca ventral muscular foot displays remarkable adaptive radiation. Gastropods retain broad creeping sole for crawling, bivalves hatchet-like foot for burrowing, polyplacophorans broad adhesive disc for clinging. Cephalopoda, literally head-foot, shows most derived modification where embryonic foot migrates anteriorly around mouth, dividing into prehensile muscular arms and tentacles bearing suckers as muscular hydrostats, plus posterior funnel derived from foot for jet propulsion. This transformation supports active nektobenthic predation in squids, cuttlefish and octopuses, enabling ra

Ref: Campbell Biology, 12th ed., Chapter 33: Protostomes - Cephalopod foot modification; Brusca & Brusca

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Animal Classification

Cephalopods differ from other molluscs because they have

Cephalopods differ from other molluscs in circulatory physiology because they have closed circulatory system whereas most molluscs retain open sinuses with hemocoel pooling. Closed system with systemic heart and two branchial hearts generates high blood pressure channeling hemolymph through continuous vessels and capillary beds, enabling rapid oxygen delivery to large brain, sophisticated eyes and powerful mantle jet muscles for escape. Radula present, head well developed with arms derived from foot, gills present as ctenidia. Closed circulation correlates with active predatory lifestyle, elev

Ref: Campbell Biology, 12th ed., Chapter 33: Cephalopods; Brusca & Brusca, Invertebrates, 3rd ed.

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