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Class – Cyclostomata, ●, , All living members of the class, Cyclostomata are ectoparasites, , on some fishes., , Two sea lamprey preying on a brown trout, , TLB’S Biology Classes
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Class – Cyclostomata, , ●, , They have an elongated body, bearing 6-15 pairs of gill, , slits for respiration., , TLB’S Biology Classes
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Class – Cyclostomata, , ●, , Their body is devoid of scales, and paired fins., , TLB’S Biology Classes
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Class – Cyclostomata, , ●, , Cranium and vertebral column, are cartilaginous, , TLB’S Biology Classes
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Class – Cyclostomata, , ●, , Circulation is of closed type., , TLB’S Biology Classes
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Class – Cyclostomata, ●, , Cyclostomes are marine but migrate for spawning to fresh water., , ●, , After spawning, within a few days, they die., , ●, , Their larvae, after metamorphosis, return to the ocean., , Ammocoetes larva, TLB’S Biology Classes
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Class – Cyclostomata, ●, , All living members of the class Cyclostomata are ectoparasites on some, fishes., , ●, , They have an elongated body bearing 6-15 pairs of gill slits for respiration., , ●, , Their body is devoid of scales and paired fins., , ●, , Cranium and vertebral column are cartilaginous., , ●, , Circulation is of closed type., , ●, , Cyclostomes are marine but migrate for spawning to fresh water., , ●, , After spawning, within a few days, they die., , ●, , Their larvae, after metamorphosis, return to the ocean., Examples: Petromyzon (Lamprey) and, Myxine(Hagfish)., TLB’S Biology Classes
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Class – Chondrichthyes, ●, , They are marine animals with streamlined body and, have cartilaginous endoskeleton., , ●, , Mouth is located ventrally., , TLB’S Biology Classes
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Class – Chondrichthyes, ●, , Gill slits are separate and without, operculum (gill cover)., The skin is tough, containing, minute placoid scales., , TLB’S Biology Classes
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Class – Chondrichthyes, , ●, , Teeth are modified placoid scales, , ●, , Their jaws are very powerful., , ●, , These animals are predaceous., , which are backwardly directed., , TLB’S Biology Classes
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Class – Chondrichthyes, Due to the absence of air bladder,, they have to swim constantly to avoid sinking., , TLB’S Biology Classes
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Class – Chondrichthyes, , Heart is two-chambered, (one auricle and one ventricle)., , TLB’S Biology Classes
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Class – Chondrichthyes, Some of them have, electric organs, , Some possess, poison sting, (e.g., Trygon)., , (e.g., Torpedo), , TLB’S Biology Classes
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Class – Chondrichthyes, ●, , They are cold-blooded (poikilothermous) animals, i.e.,, they lack the capacity to regulate their body temperature., , ●, , Sexes are separate., , ●, , In males pelvic fins bear claspers., , ●, , They have internal fertilisation and many of them are viviparous., , TLB’S Biology Classes
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Class––Chondrichthyes, Cyclostomata, Class, ●, , They are marine animals with streamlined body and have cartilaginous, endoskeleton., , ●, , Mouth is located ventrally., , ●, , Notochord is persistent throughout life., , ●, , Gill slits are separate and without operculum (gill cover)., , ●, , The skin is tough, containing minute placoid scales., , ●, , Teeth are modified placoid scales which are backwardly directed., , ●, , Their jaws are very powerful., , ●, , These animals are predaceous., , ●, , Due to the absence of air bladder, they have to swim constantly to avoid, sinking., TLB’S Biology Classes
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Class – Cyclostomata, ●, , Heart is two-chambered (one auricle and one ventricle)., , ●, , Some of them have electric organs (e.g., Torpedo), , ●, , Some possess poison sting (e.g., Trygon)., , ●, , They are cold-blooded (poikilothermous) animals, i.e., they lack the, capacity to regulate their body temperature., , ●, , Sexes are separate., , ●, , In males pelvic fins bear claspers., , ●, , They have internal fertilisation and many of them are viviparous., , TLB’S Biology Classes
