I have heard that ancient sharks had 6 gills slits and modern sharks have only 5. But in pictures that I have seen online, all the pictures of prehistoric sharks have only five and the only one i can find with 6 is a modern shark called a Sixgill. Please help me because I need it for research for an art project.
2006-11-04 10:15:52 · 2 answers · asked by Greg B 3 in Science & Mathematics ➔ Zoology
Most sharks have five pairs of gill slits, but some have six or seven pairs.
Elasmobranchs have five to seven pairs of gill slits.
http://www.seaworld.org/animal-info/info-books/sharks-&-rays/scientific-classification.htm
>>Order Hexanchiformes: Frilled, six, and sevengill sharks
These sharks possess seven pairs of gill openings
>>The Frilled Shark has six pairs of gill slits.
http://www.austmus.gov.au/fishes/fishfacts/fish/cangu.htm
>>Order Pristiophoriformes: Sawsharks
Sixgill sawshark has 6 slits of gills but all other sawsharks (4 species) possess 5 pairs of gill slits.
http://www.shark.ch/Database/Search/species.html?sh_id=1104
>>Order Hexanchiformes: Cow Sharks - 4 species have ‘extra’ pairs of gill slits — the group’s scientific name means “six arches”, referring to the gills, but may have either six (in Hexanchus) or seven (in Heptranchias and Notorynchus) pairs. http://www.elasmo-research.org/education/shark_profiles/hexanchiformes.htm
Most modern sharks have 5 slits of gills.♥
2006-11-11 15:07:46 · answer #1 · answered by ♥ lani s 7 · 1⤊ 0⤋
the prehistoric shark was believed to have 6 gills,and todays, shark only 5...It depends in the spices of shark.A 6 gill was found living in the ocean depths not too long ago
2006-11-04 18:23:16 · answer #2 · answered by krusty_blue_spaz 5 · 0⤊ 0⤋