There are two important processes that play a significant role in parasitism, infections and intoxications. 1. Infection: Infection refers to entry of a pathogen into host tissues after transmission, and its growth and reproduction resulting in disease. The events of infection are as below: (i) Attachment and Colonization by the Pathogen: The host contains its own normal microbial flora. A [...]
The life history of Sacculina is extremely interesting. The actual mechanism of fertilisation is not known. Opinion varies regarding the process of fertilisation. According to Delage's view all the batches of the eggs are fertilized by the sperms of the same individual except the first batch. So this kind of fertilisation is known as self fertilisation. But above all the [...]
The adult Sacculina is known as Sacculina externa which is a parasite of young decapod crustacean, the crab. Generally the female crab is parasitized by the Sacculina. The parasitic habit has caused much degeneracy of different structures in the adult and looks like a fleshy tumour. The adult looses all the external appendages, the carapace and the segmentation of the [...]