In this article we will discuss about the digestive system of dogfish (scoliodon) with the help of suitable diagrams. Alimentary Canal: The alimentary canal of Dogfish (Scoliodon) comprises the mouth, buccal cavity, pharynx, oesophagus, stomach, intestine and rectum opening in the cloaca through anus. a. Mouth: It is a ventral crescentic opening guarded by upper and lower lips which are [...]
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 [...]