In this article we will discuss about the process of reproduction in dogfish with the help of suitable diagrams. Copulation: During copulation one or both the claspers of the male are inserted into the cloaca of the female and are fixed in position by the erection of terminal pieces. The spermatic fluid is forced through the grooves of the claspers [...]
In Scoliodon, the exoskeleton comprises the placoid scales, embedded in the skin. Structure of a Placoid Scale: A typical placoid scale consists of mainly two parts- the basal plate and the flat trident spine. The basal plate is diamond-shaped and lies embedded in the dermis and firmly placed by Sharpey's and other connective tissue fibres. The basal plate is formed [...]
The receptor organs or sense organs of Dogfish (Scoliodon) include the paired olfactory, optic or photoreceptor, statoacoustic organs, the lateral line organs or neuromasts and the ampullae of Lorenzini. Olfactory Organs (Olfactoreceptors): The olfactory organs of Dogfish (Scoliodon) are a pair of blind olfactory sacs lying on the ventral side of the head in front of the mouth. They are [...]