Question

7) Please create a phylogenetic tree (cladogram) of these major deuterostome groups of animals. At each branch node, indicate the trait (or traits; or presence/absence) that you used to divide the groups. I know space is tight, but please write as legibly as you can! (11 pts; 1 pt each for node description—7 total, 0.5 pts each for group on the end of a branch—4 total):

A) Reptilia B) Agnathans (Lampreys & Hagfish) C) Echinodermata D) Amphibia E) Osteichthyes F) Aves (Birds) G) Chondrichthyes H) Mammalia

Answer 1

Radial symmeby water vascular systems Той я раздел а: loss of pharyngeal gill the Echinoderms " outgroups of chordata - Acorn worms Loss of 4 Xenoturbella pharyngeal gill slits -Lancelets gill salyngeal CHORDATA Tunicates CHORDATA Dorsal hollow nerve Notochord Muscular, Post- anal tail VERTEBRATA Hag Fish [ TO Agnathans Agnathans Vertebrae, 4 Cranium Lampreys chondrichthyes GNATHOS TOMATA Ishack, rays, skates) Osteichthyes Jaws 4 [Ray Finned fishes •Coelacanths SARCOPTERYGII Lungs, Internal bone [Endoskeleton) tobed Fins 4 -lung Fish impurple frogs, toads TETRA PODA I salamander Lactation, for -Mammalia AMNIOTA Limbs 4 Ammotic Reptilia izards, snakes Ege 4 - Turtles Scales with hard keratin Alligators, Crocodiles L Birds (Aves)