Copyright © 2013 McGrawHill Education. All rights reserved. No reproduction or d

Question

Copyright © 2013 McGrawHill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Chordata (animals with notochord at some stage in lile cycle) Craniata (eucordates with a crarum) Vertebrata Gnathostomata (Craniata with jaws) Teleostomi (bony ishes setrapoda) Tetrapoda (lour-limbed vertebrates Reptilia bony fishes) (ray-finned fishes) birds) Swoopery mphitiaMammiOlizardk. snakes ourtes) Crocodina Chondrichthyes (sharks, rays Hair marmenary hagfishes Skull with upper and Beta-keratin in epidermis Egg with amnion Suckerdike oral disc, long larval stage, 7 pairs Paired Imbs used for terrestrial locomotion ot gis Heterocarcal caudal fin, Glime ganas accessony heurts Unique supportive elemerts in skeleton or gindies of appendages cartiagnous Lung or swieblaoter derved trom gut, bony endoskeleson Jaws, 3 pairs semcircular canas paired appendages Distinct head and bripartibe brain, paired specialized sense organs, 1pai Neural cest Notochord, dorsal hollow nerve cord, pharyngeal sits postanal tail, endoshyle Agnathans are traditionally thought of as jawless fish: lampreys and hagfish. According to figure 23.2 is Agnatha" a monophyletic group? O Yes O No

Explanation / Answer

Agnathans are traditionally thought of as jawless fish: lampreys and hagfish. according to figure 23.2, is agnatha a monophyletic group:

Yes

A monophyletic group is a group of organisms that forms a clade, which consists of all the descendants of a common ancestor. Monophyletic groups are characterised by shared derived characteristics, and it distinguishes organisms in the clade from other organisms.

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