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Class Agnatha Classification o Superclass: Agnatha o Sub Class: ______________________________________ = hagfish o Sub Class: _______________________________________=lamprey o Order = Petromyzontiformes Petromyzon marinus The sea lamprey. Originally described by Linnaeus back in 1758. This species is native to much of the coastal areas in the Northern Atlantic. Petromyzon = ____________________________________________ This is the creature that got into the Great Lakes and has caused havoc. ? Hagfish = Sub Class Myxini o _______________________________________ o ___________________________________ or predators feeding off dead or dying fish and sea life. o Senses: _____________________________, but good senses of_____________________ and smell. Notable Facts about Hagfish o o Excellent Adaptation: Its body fluid are in _______________________________________________ with sea water. This makes it easier to maintain water balance and deal with some waste. Can tie itself in a ________________________to more securely attach itself to its prey. o Can generate enormous amounts of____________________________. Video Clip: Lampreys = Sub class Cephalaspidomorphi o _____________________________________________________. o Marine species are _____________________________________ Which means they live in the sea/ocean and migrate up freshwater streams to spawn. Like salmon. o Around ½ of lamprey species are _________________________ and the others as adults do not feed and their digestive systems reduces in size and becomes non-functional. Characteristics: Anatomy and Structure of Lamprey o Only ___________________ fins. No ________________________ appendages. o Long eel like shape. The Mouth!! o Most notable _________________________________ characteristic. o A_____________________________mouth, that is used for _____________________ and rasping. o Mouth contains 11 to 12 rows of circular ___________________ teeth enclosed by an oral hood. This teeth hood arrangement is called _______________________________. o The ___________________________________gland in the mouth releases an _______________________________________ that helps the flow of blood when it attaches to a fish. Digestive Tract and Parasitic Feeding o The superior design of the buccal funnel allows it to attach to fish and get a good seal, which helps maintain correct pressure for blood flow. o Prefers, blood and body fluids, but some flesh etc. also is consumed. o Under lab conditions feeding lasts 76 hours. With young adults up to 200!! o No__________________________________only an intestinal tract. Skeleton System o Has _________________________________________ present as an adult. o It is slightly modified in that it has _________________________________________ and thus are put with the subphylum vertebrata. o __________________________________________ skeleton with a cranium, a brain case. Circulatory and Excretory o ____________chambered heart. Of interest with hagfish they have 3 additional aortic arches, but with a low pressure circulatory system. o Mesonephric Kidney: “__________________________” kidney (out of 3) filters waste materials o Excretion of waste through __________________________________________ and possibly gills. Nervous System o Differentiated ________________________________ o 8-12 pairs of _____________________________ nerves o Sight more developed than hagfish, and will use it to locate prey/host near the surface or shallow water. o Has a ____________________________________ located on top of head. A light sensitive organ which senses diurnal changes. SEX and Reproduction o Hagfish are ____________________________________________ and have gonads for both sexes. Will only be male or female but can change from year to year. o Lamprey: ___________________________________ o __________________________________ fertilization o Females produce on average 230,000 eggs which are adhesive and non-buoyant. o Great Lakes average is 60,000 eggs. (r or K strategist?)