SI 9 1 09 Fish Worksheet 1 Earliest group of fish jawless no paired fins no vertebral column this superclass is not a true taxonomic group a Agnatha 2 What are the two extant classes of jawless fish a Myxini and Cephalaspidomorphi 3 This fish is eel like jawless has slime glands has no stomach is a decomposer and deep marine species a Hagfish or Myxini b Follow up question Are these true vertebrates NO 4 This fish is jawless scaleless has no paired fins and filter feed as larvae adults either do not feed or feed via parasitic rasping into fish a Cephalaspidomorphi or lampreys 5 There are many forms of this jawless fish which are now extinct but they are grouped under one name They have a covering of dermal bone forming armored carapace sometimes with smaller plates or scales What is the group name a Ostracoderms 6 This superclass evolved a hinged jaw and paired limbs a Gnathostomata 7 Osctracoderms which are now extinct appeared in this era 490 350 MYA a Ordovician Devonian 8 This adds stability during locomotion and is the source of tetrapod limbs a Paired Fins 9 These are the two extinct classes of Gnathostomata a Acanthodia and Placodermi 10 This class includes animals with cartilaginous skeleton heterocercal tail no swim bladder and sharks skates and rays a Chrondrichthyes cartilaginous fish 11 This class lived during the second half of the Paleozoic and includes characteristics such as toothed jaws heterocercal tails a vertebral column and multiple sets of paired fins a Acanthodia 12 Half of the living vertebrates belong to this class a Osteichthyes 13 This is a pouch from the esophagus with air volume regulated for buoyancy It does not appear until Class Osteichthyes a Swim bladder 14 This subclass includes ray finned fishes and the infraclasses Chondrostei and Neopterygii a Actinopterygii 15 This class is the oldest group of osteichthyes are lobe finned and a precursor to tetrapods a Sarcopterygii 16 This order of Sarcopterygii were common during the Devonian and are termed a living fossil a Coelocanthiformes 17 Fish in this order are the closest living relatives of tetrapods and fall under the class Sarcopterygii a Ceratodontomorpha 18 Ceratodontomorpha lung fish form a cocoon during dry periods and do this in mud a Aestivate 19 List and describe the 3 types of fish scales Placoid from mesoderm composed dentine ganoid composed of bone Cycloid ctenoid outer layer of bone thin layer connective tissue 20 What caused the predatory lifestyle to begin Hinged jaws wider prey types 21 What fish class was the precursor to tetrapods a Rhipidistians order coelocanthiforms 22 When was the age of the fishes a Devonian
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