Characteristics Of Class Myxini

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Characteristic Class Myxini Class Cephalospidomorphi Class Chondrichthyes Class Osteicthyes
Members (hagfishes, slime eels fish) (lamprey fish) (ratfish, skates, rays, sharks) (bony fishes)
Symmetry Bilateral Bilateral Bilateral Bilateral
Coelom and Body Organization Well-developed coelom Well-developed coelom Well-developed coelom Well-developed coelom
Germ Layers and Development Three germ layers
Ectoderm, mesoderm and endoderm Deuterostome Deuterostome Three germ layers
Ectoderm, mesoderm and endoderm Deuterostome multilayered epithelium or skin Three germ layers
Ectoderm, mesoderm and endoderm Deuterostome Three germ layers
Ectoderm, mesoderm and endoderm Deuterostome
Respiratory system Gills..
Seven gills on each side
-gills
gills
-lungs (swim bladder) in lungfish
Circulatory system Both closed and open blood vessels, with a heart system that is more primitive than that of vertebrates. Closed circulatory system
2 chambered heart
Closed circulatory system. Sharks have a two chambered heart. Their hearts are S-shaped tubes located in the head region of the shark. Blood is pumped by the heart through afferent branchial arteries to capillaries in the gills, where blood is oxygenated. Closed circulatory system
2 chambered heart
-arteries and veins
-aortic arches in gills
Skeletal system bony cartilaginous endoskeleton They lack almost every bone found in other vertebrates and have bones made entirely from cartilage. endoskeleton of cartilage bony endoskeleton
Nervous system Nerve cells hook up together to form a nervous system. A nerve cord is on the dorsal side sends and receives messages. I use two main senses in responding to my environment. These senses are smell and touch.
They have a flattened spinal cord, and unlike other vertebrates the dorsal
(sensory) and ventral (motor) roots of the spinal nerves arise alternately, instead of simultaneously, and remain separate. differentiated brain with two hemispheres
-specialized lobes for sight, smell, taste, and hearing -lateral line system differentiated brain with two hemispheres
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