Acoelomate, Annelida, Archaea, Arthropoda, bacillus, Cephalopoda, chordate, Cnid

Question

Acoelomate, Annelida, Archaea, Arthropoda, bacillus, Cephalopoda, chordate, Cnidaria, cnidoctye, coccus, coelomate, cranium, ecdysis, echinoderm, Eubacteria, extinction, exoenzymes, Hemichrodata, Mollusca, notochord, ostium, Platyhelminthes, pharyngeal gill slits, pseudocoelomate, speciation, spirillum ________ The class or phylum for organisms like the squid, octopus, cuttlefish and Nautilus. ______ The bilateral body plan where there is a solid body lacking a cavity between the digestive system and the ectoderm. Flatworms are an example of an organism with this type of body plan.

Explanation / Answer

51) Platyhelminthes - bilateral body lacking ectoderm and digestive system cavity. No true internal body cavity or coelom. Example flatworms, body not segmented and no specialized circulatory, respiratory or skeletal systems.

50) Mollusca - Example squid, octopus, or cuttle fish.

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