Sharks Exam 1 Flashcards
All Chondricthyes have?
tesserae, claspers, placoid scales, polyphyodont teeth, cartilaginous skeleton, skull has no sutures, fins have cartilage and ceratrichia, no swim bladder
What does Chondricthyes include?
Elasmobranchii and holocephali
What is Holocephali?
Chimaeras
What do elasmobranchii include?
cladoselache, xenacanthus, ctenacanthus, hybodus, galeomorphs, squaliformes, batoidea
What does euselachii include?
hybodus, Galeomorphs, squaliformes, batoidea
What does Neoselachii include?
Galeomorphs, squaliformes, Batoidea
What does squalea include?
Squaliformes and batoidea
What was unique to Chimeras?
upper fused jaw to cranium, operculum covers four gill slit, male head clasper, swim with pectoral fin, some have bifurcated claspers
What belongs to Chimeras?
ratfish
What do cladoselache have?
Two Spines?
What is included in the order - Carchariniformes?
catsharks, houndsharks, carcharhinidae - requiem sharks, sphyridae - hammerhead sharks (bonnethead)
What is included in the order of Lamniformes?
sandtiger, goblin, crocodile, megamouth, thresher, basking, mackerel sharks - white shark
What is included in the order of Orectolobiformes?
Carpet, wobbegong, bamboo, nurse, zebra, wale sharks
What is included in the order of Heterodontiformes?
Bullhead sharks - different kinds of teeth, pointy and crushing, spine on back dorsal
What is included in the order of Hexanchiformes?
frill, sevengill, six gill - squalomorphi
What is included in the order of Echinorhiniformes?
Bramble and prickly sharks - have modified scales
What is included in the order of Squaliformes?
sleeper, Greenland, lantern, dogfish, gulper, kitefin, rough sharks, cookiecutter
What is included in the order of squatiniformes?
angel sharks - depressed sharks live on the bottom
What is included in the order of Pristiophoriformes?
saw sharks - rostrum with teeth, live on bottom
What are characteristic of batoid?
kinetic upper jaw, 5 ventral gill slits, males one clasper on each pelvic fin, dorsoventrally flattened, pectorals fused to head, most derived - split later
What is included in Batoidea?
skates, rays and pristiformes, rhinobatiformes, torpedoformes, rajiformes, myliobatiformes,
What is pristiformes?
saw fish
What is Rhinobatiformes?
guitarfishes - extendable jaw
What is Rajiformes?
skates - walking appendages