The triangles show the inferred origins of "warm-blood" in billfishes and tunas. Knowing that the most recent common ancestor of all the fish in the tree was cold-blooded and that all the fishes in the tree except tunas and billfishes are cold-blooded, what can be said?

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Chapter1: The Human Body: An Orientation
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Most fish species are considered cold-blooded because they can't generate body heat like birds and mammals. Billfishes and Tunas are notable exceptions. These fish can generate significant amount of body heat and are thus considered warm-blooded. The tree below shows the relationship among several species of fish including billfishes and tunas. The triangles show the inferred origins of "warm-blood" in billfishes and tunas. Knowing that the most recent common ancestor of all the fish in the tree was cold-blooded and that all the fishes in the tree except tunas and billfishes are cold-blooded, what can be said?

 

 

Istiophorus platypterus
Makaira nigricans
Tetrapturus albidus
Tetrapturus audax
billfishes
Tetrapturus angustirostris
Tetrapturus belone
Makaira indica
Xiphias gladius
Thunnus alalunga
Thunnus albacares
Thunnus maccoyli
Thunnus thynnus
Thunnus obesus
tunas
Katsuwonus pelamis
Euthynnus affinis
Euthynnus alletteratus
Auxis thazard
Sarda chiliensis
bonitos
Sarda sarda
Gasterochisma melampus
Scomber japonicus
Scomber scombrus
Gempylus serpens
Lepidocyblum flavobrunneum
mackerels
Ruvettus pretiosus
Scomberomorus cavalla
Scomberomorus maculata
Trichiurus lepturus
Sphyraena sphyraena
Coryphaena equiselis
outgroups
Serranidae
Transcribed Image Text:Istiophorus platypterus Makaira nigricans Tetrapturus albidus Tetrapturus audax billfishes Tetrapturus angustirostris Tetrapturus belone Makaira indica Xiphias gladius Thunnus alalunga Thunnus albacares Thunnus maccoyli Thunnus thynnus Thunnus obesus tunas Katsuwonus pelamis Euthynnus affinis Euthynnus alletteratus Auxis thazard Sarda chiliensis bonitos Sarda sarda Gasterochisma melampus Scomber japonicus Scomber scombrus Gempylus serpens Lepidocyblum flavobrunneum mackerels Ruvettus pretiosus Scomberomorus cavalla Scomberomorus maculata Trichiurus lepturus Sphyraena sphyraena Coryphaena equiselis outgroups Serranidae
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