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 bony fish have a pair of gills that are situated inside their bodies, and the cartilaginous fish have gill slits on the outer side of their bodies, present on both sides. In the cartilaginous fish, the teeth, nostrils on the side of the head and the tiny tooth like scale are not fused together to the jaw.Fertilization of the eggs occurs through the process of internal fertilization unlike bony fish, where fertilization takes place outside the body.nique Characteristics. 1.The skeleton of the cartilaginous fish is out of a flexible bone-cartilage. The skeleton does not have any bone. 2.These fish have dorsal fins, an anal fin, a pair of ventral fins and a single caudal fin.