In soft tissues, crepitus can be produced when gas is introduced into an area where it is normally not present. The term can also be used when describing the sounds produced by lung conditions such as interstitial lung diseaseâthese are also referred to as rales.
Bloodfin Tetra-Information about keeping and breeding Bloodfin Tetras in aquariums. Breeding the Black Tetra-Breeding notes for Gymnocorymbus ternetzi. Cardinal Tetra Fish-An introduction to Cardinal teras-Paracheirodon axelrodi. Cardinal Tetra-Information about all aspect of keeping and breeding Cardinal Tetras.
The earliest tetrapods, called basal or stem tetrapods, such as the species Acanthostega, are more primitive than the common ancestor of all tetrapods alive today, and so do not fall into any of the main tetrapod groups. There are only a few dozen species in this classification, and they are all long extinct.Aside from the basal tetrapods, there are three major groups of tetrapods: amphibians, synapsids (meaning fused arch, mammals are the only synapsids alive today), and sauropsids (meaning lizard face).he earliest tetrapods, called basal or stem tetrapods, such as the species Acanthostega, are more primitive than the common ancestor of all tetrapods alive today, and so do not fall into any of the main tetrapod groups. There are only a few dozen species in this classification, and they are all long extinct.