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They have a bony skeleton, are generally laterally flattened, have five pairs of gills protected by an operculum, and a mouth at or near the tip of the snout. Bony fish have a swim bladder which helps them maintain a constant depth in the water column, but not a cloaca.They mostly spawn a large number of small eggs with little yolk which they broadcast into the water column Mammals are a diverse class of animals, mostly terrestrial but some are aquatic and others have evolved flapping or gliding flight.Obliquely striated muscle is intermediate between the other two.The filaments are staggered and this is the type of muscle found in earthworms that can extend slowly or make rapid contractions.They have a cloaca into which the urinary and genital passages open, but not a swim bladder.Cartilaginous fish produce a small number of large, yolky eggs.
The dermis is covered with separate dermal placoid scales.
Muscle cells (myocytes) form the active contractile tissue of the body.