The class Chondrichthyes means a class that contains cartilaginous fishes whose skeleton is composed of cartilage. In either in their mouth or along whisker-like Many larger, pelagic species, such as the mackerel sharks (Lamnidae) and the thresher sharks (Alopiidae), no longer possess them. NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 8 Social Science, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. They bring water into their bodies using one of two methods: Ram ventilation - requires forward movement by the organism. Chondrichthyes sensory systems are part of the nervous system responsible for receiving external and internal stimuli and translating them into nerve impulses that are transmitted to the central nervous system where they are processed. The egg cases of most species are more or less pillow-shaped; those of the horned sharks (Heterodontus francisci) are screw-shaped with a spiral flange. We've learned that they have a branching system of peripheral nerves that help them sense their environment, as well as motor nerves that help them move. https://doi.org/10.1007/s004410000328. Lisney, T. J., & Collin, S. P. (2007). Having skeletons predominantly composed of cartilage is characteristic of cartilaginous fish, while having skeletons mostly composed of bone is characteristic of bony fish. Sensory adaptations to the environment: Electroreceptors as a case study. Chondrichthyes digestive system: The stomach, pharynx, mouth, intestines, and cloaca make up the digestive system. Journal of Morphology, 250(3), 236264. In females, the cloaca serves both as a reproductive organ and as an excretory organ. Meredith, T. L., Kajiura, S. M., & Hansen, A. The Central Nervous System of Hagfishes | SpringerLink Explain how a shark is able to maintain buoyancy. Mandado, M., Molist, P., Anadon, R., & Yanez, J. Cartilage is the flexible substance found that gives human noses and ears their shape! The diencephalon is associated with the pineal body, which detects light and dark and coordinates color changes.
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