Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 32.1, Problem 2R
Summary Introduction
To review:
The evidence in support of the monophyly of deuterostomes.
Introduction:
The echinoderms, chordates, and hemichordates are classified under one common group known as deuterostomes. The taxonomists consider the organisms under these classes to have been derived from a common ancestor, which denotes their monophyly.
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What are three shared derived characters of deuterostomes?
Molecular sequence data indicate that Xenoturbella is a deuteros-tome. Are there corresponding morphological characters?
Match the following groups under Phylum annelida to the following characters:
Match each item to a choice:
Branchiobdellida
Hirudenea
Acanthobdellida
Oligochaeta
Polychaeta
Choices:
: Loss of remaining setae; 34 metameres
: Anterior body sucker; 15 metameres
: Presence of clitellum; but without superficial annuli
E Posterior body sucker; 30 metameres
: Parapodia; complex head
Chapter 32 Solutions
Life: The Science of Biology
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- Cyclostomes are often thought as of as “primitive” because they lack jaws. In what ways could the heads of cyclostomes be considered to be derived in their own way?arrow_forwardWhat is the sister group to Innovatiocaris maotianshanensis? The phylogeny shows that some named groups are not monophyletic. For each of the following groups, state whether it is monophyletic: Hurdia - YES OR NO Hurdidae- YES OR NO Lyrarapax- YES OR NO Amplectobelua- YES OR NO Amplectobeluidae- YES OR NO Anomalocaris- YES OR NOarrow_forwardWhat characters unite rotifers and acanthocephalans as members of clade Syndermata?arrow_forward
- Which characters differentiate living cyclostomes and living chondreityans?arrow_forwardWhat developmental characters are used to diagnose protostome and deuterostome groups (clades)?arrow_forwardGive synapomorphic characters that would group Phylum Kinorhyncha and Priapulida as a sister taxonarrow_forward
- Differentiate between Phylum Porifera and Clade Eumetazoa. A)Poriferans are only haploid during their life cycle, whereas eumetazoans are diploid with haploid sex cells at various stages of their life cycle. B)Poriferans have mobile gametes while eumetazoans do not. C)Poriferans invert during their development whereas eumetazoans do not invert at any time during their life cycle. D)The various cells types of Poriferans do not form permanent associations into true tissues during their life cycle, whereas Eumetazoa possess true, stable tissues. E)Poriferans have only one kind of cell during their life cycle whereas Eumetazoa have many kinds of cells throughout their life cycle.arrow_forwardWhy is it difficult to determine the phylogeneticplacement of Nanoarchaeota and Korarchaeota?arrow_forward2) Identify the synapomorphies that unite the non-bilaterian phyla, as well as the protostome phyla, and the deuterostome phyla 3) Characterize each phylum of non-bilaterian and protostome phyla with their synapomorphies and differencesarrow_forward
- What are the synapomorphies of Euphasmastodea?arrow_forwardCompare and contrast the 5 major extant groups of actinopterygii: 1.polypteriformes 2.chondrostei 3. lepisosteida 4.amiidae 5. teleosteiarrow_forwardMake a phylogenetic tree just including the following= phylum nematoda (enoplea and chromadorea) phylum nematomorpha Phylum Priapulida Phylum Kinorhyncha Phylum Loricifera Phylum Tardigrada Phylum Onychophora Phylum arthropoda -include subphylums and classesarrow_forward
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