In the echinoderm phylogeny below, circle the node that represents the most recent common ancestor of asteroids and holothuroids (sea cucumbers). Label it “A”.The sister group is the clade that shares a node with the clade of interest. Circle the sister group to Eleutherozoa. Label it “B”. The diagram is a phylogenetic tree illustrating the evolutionary relationships among different classes of echinoderms. It is divided into two main groups:1. **Pelmatozoa (Stalked echinoderms)** - This group includes: - **Crinoidea (sea lilies)** - **Blastoidea†** (indicated with a dagger to signify that it is extinct)2. **Eleutherozoa (Mobile echinoderms)** - This group includes: - **Ophiuroidea (brittle stars)** - **Asteroidea (sea stars)** - **Echinoidea (sea urchins)** - **Holothuroidea (sea cucumbers)**The diagram uses a branching structure to show the evolutionary divergence from common ancestors, with "Pelmatozoa" and "Eleutherozoa" highlighted in blue and orange. The terms "Stalked echinoderms" and "Mobile echinoderms" are in red, distinguishing the two groups based on their mobility and form.

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Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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In the echinoderm phylogeny below, circle the node that represents the most recent common ancestor of asteroids and holothuroids (sea cucumbers). Label it “A”. The sister group is the clade that shares a node with the clade of interest. Circle the sister group to Eleutherozoa. Label it “B”.