19. Do echinoderms have a complete gut? A skeleton? How do they move? Are they s

Question

19. Do echinoderms have a complete gut? A skeleton? How do they move? Are they segmented? 20. Do any echinoderms have trochophore larvae? 21. Know the classes Echinoidea, Asteroidea, Holothuroidea 22. What kind of symmetry do echinoderm larvae have? 23. Know the following vocab that is specific for and Ophiuroidea. What characters define each class. Adults? echinoderms: tube feet, ossicle, pentaradial water vascular system, madreporite symmetry 24. Be able to compare and contrast sea urchins and sea stars in terms of their feeding apparatus, movement, and skeletal system. 25. What are the 4 traits shared by all chordates? Be able to list them, describe them completely (explaining all terms) and label them on a drawing of a generic chordate (like a cephalochordate). 26. Compare and contrast embryos/larvae and adults in the Urochordata, Cephalochordata, and Vertebrata in terms of the 4 chordate traits. E.g. Urochordata, Cephalochordata, and Vertebrata have all the 4 traits... but do they have them as embryos/larvae and as adults? In which stage is each trait found? 27. Explain how urochordates and cephalochordates feed. Previous Next

Explanation / Answer

19.yes echinoderms has complete guts because it's digestive system has four parts including anus.

yes all echinoderms has specific skeleton with spines and skin,it varies.

echinoderms move by their tube feet and muscle fibres.

echinoderms segmented but their segmentation is not through the longitudinal body as they have radial symmetrical body.

20.no they do not have trochophore larvae,marine annelids and most groups of mollusks,Rotifers have this larvae

21.echinoids are generally pentaradially symmetrical and, consists of a water-vascular system.they have bullet gif Spines which are primarily used for locomotion and defense against predators.

asteroideae have flat, pentagonal or star shaped body with Oral and aboral surfaces , the oral surface is directed toward down and the aboral surface up.They have five to fifty long or short rays or arms radiating symmetrically from central disc.

holothuroidae have Lack arms,Bilaterally symmetrical Body ,wall soft rather than calcareous.Dioecious with a single gonad.Sedimentary feeders.Body surrounded by tube feet,Interior madreporite, Branched tentacles surrounding mouth that are lined with modified water vascular system.

ophiuroidae is crawling across the sea floor using their flexible arms for their locomotion. They generally have five long, slender, whip-like arms which may reach up to 60 cm (24 in) in length on the largest specimens.its related to starfish

22.echinoderm larvae is generally bilaterally symmetrical and adults are radially symmetrical.

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