We cannot, for instance, suppose that in the embryos of the vertebrata the peculiar loop-like course of the arteries near the branchial
slits are related to similar conditions,--in the young mammal which is nourished in the womb of its mother, in the egg of the bird which is hatched in a nest, and in the spawn of a frog under water.
After having been taken out of water for a short time, and then again immersed in it, a considerable quantity both of water and air is absorbed by the mouth, and perhaps likewise by the branchial orifices.
The fish, having remained in this distended state for a short time, generally expelled the air and water with considerable force from the branchial apertures and mouth.
KEY WORDS: parasites, trematodes, branchial
coccidia, rickettsiales-like organisms, hemocytic infiltration, razor clam Ensis macha (Pharidae)
It has been proposed that choristoma of the middle ear could be part of a syndrome characterized by embryonic developmental anomalies, as suggested by its frequent association with ossicular chain, facial nerve, and second branchial
Histopathologic results were consistent with a branchial
cyst with carcinoma.
Of the spring systems that were populated with snails, all contained the trematode and were positive for branchial
infection in fish, except Diamond Y Springs that contained uninfected snails and fish during both years.
Excysted metacercariae from gill chamber or branchial
region move around freely (Fig.
Cetorhinus maximus is also characterized by having large gill slits that nearly encircle the head, numerous long, filamentous dermal denticle gill takers lining the anterior and posterior sides of each branchial
arch, a strongly pointed snout and large subterminal mouth with numerous small, monocuspid teeth, strong lateral keels on the caudal peduncle and a large lunate caudal fin (Compagno, 2001).
The fetal branchial
apparatus develops in the 2nd gestational week and consists of 6 pairs of mesodermal arches separated by 5 ectoderm-lined branchial
clefts externally and 5 endoderm-lined pharyngeal pouches internally.
The denticles and denticulate platelets discovered, along with rostral, cephalo-pectoral and lateral scales, give evidence that they come from the anterior part of the body, from the lining of the bucco-pharyngeal and branchial
The differential diagnosis includes Sjogren's disease, Whartin's tumour and branchial