Both arthropods and annelids are segmented and members of the annelid class Polychaeta have a pair of appendages on each segment. The arthropods share many features with the phylum Annelida. Which phylum is most closely related to the arthropods? All animals are heterotrophic ingesting living or dead organic matter. The blastopore lips are indicated in red and fused blastopore lips are shown as dashed red lines a new anus is indicated by a yellow asterisk and a new mouth by a yellow circle. Animals require a source of food to grow and develop. Most animals are motile at least during certain life stages. Which of the following is a defining characteristic of animals?Īll animals are eukaryotic multicellular organisms and almost all animals have specialized tissues. Which of the successful and diverse animal phyla are the chordates most closely related to?Įchinoderms are the most closely related phylum to the phylum Chordata which includes many complex organisms such as humans. Annelids are a taxon of protostomes comprising more than 17,000 worldwide013 distributed species, which can be found in marine, limnic, and terrestrial habitats. Others consider them a sister group of vertebrates in the common taxon of craniata. Molecular analysis since 1992 has suggested that hagfish are most closely related to lampreys and so also are vertebrates in a monophyletic sense. Echinoderms are more advanced than annelids. Phylum annelid includes bilaterally symmetrical segmented worms while phylum Echinodermata includes radially symmetrical marine organisms. Which of the following animals is most closely related to the hagfish? What are the similarities and differences of echinoderms and annelids Both phyla include invertebrates that are non-chordates.
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