Different Symptoms for Different Causes of Pain. Orchialgia caused by infection is severe and even in cutting pain accompanied by fever with chilliness, reddened and swollen scrotum, and apparent tenderness. Most bacterial orchitis is caused by adjacent epididymal inflammation, so it is also called epididymo-orchitis.
From Wikipedia, the free encyclopedia. Agnatha (Greek, no jaws) is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (conodonts and ostracoderms) species. The group excludes all vertebrates with jaws, known as gnathostomes.he Agnatha are ectothermic or cold blooded, with a cartilaginous skeleton, and the heart contains 2 chambers.
The group agnatha, also known as the jawless fish, make up one group of fishes. There are about 100 species of jawless fish, which can be placed into one of two groups â the lampreys and the hagfish.Interestingly, although these fish do belong to the vertebrate subphylum, they do not technically have vertebrae.here are about 100 species of jawless fish, which can be placed into one of two groups â the lampreys and the hagfish. Interestingly, although these fish do belong to the vertebrate subphylum, they do not technically have vertebrae.