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Sixty percent of the dog's body mass falls on the front legs. [14] The dog has a cardiovascular system. The dog's muscles provide the dog with the ability to jump and leap. Their legs can propel them to leap forward rapidly to chase and overcome prey. They have small, tight feet and walk on their toes (thus having a digitigrade stance and ...
A stalked crinoid (white) and a comatulid (red) in deep sea, showing the differences between these two sister groups. Most modern crinoids, i.e., the feather stars, are free-moving and lack a stem as adults. Examples of fossil crinoids that have been interpreted as free-swimming include Marsupites, Saccocoma and Uintacrinus. [23]
Articulata are a subclass or superorder within the class Crinoidea, including all living crinoid species. They are commonly known as sea lilies (stalked crinoids) or feather stars (unstalked crinoids). The Articulata are differentiated from the extinct subclasses by their lack of an anal plate in the adult stage and the presence of an ...
It is often associated with other crinoids and bryozoans [2] and may dominate its habitat. It moves from place to place, clinging to rocks, seaweed and molluscs with its clawed cirri. It favours areas with strong currents in both sheltered and fairly exposed positions and is often found in gullies.
Canine transmissible venereal tumors are histiocytic tumors that may be transmitted among dogs through coitus, licking, biting and sniffing tumor affected areas. The concept that the tumor is naturally transmissible as an allograft came from three important observations. First, CTVTs can only be experimentally induced by transplanting living ...
The World Canine Federation recognizes 350 unique dog breeds. In the U.S. The American Kennel Club now recognizes 209 breeds. That’s…a lot of dogs. To better understand each breed, humans have ...
Cenometra bella is a species of crinoids belonging to the genus Cenometra.They can have up to 30 arms [2] and can be of variable colours but are often characterised by a marked contrast between the extending free-arms and the feathery pinnules (for example, dark brown and white). [2]
Platyceratidae is an extinct family of Paleozoic sea snails, marine gastropod mollusks.This family may belong in the Patellogastropoda or the Neritimorpha. [2]Platyceratids are known for the complex symbiotic relationships they had with crinoids. [3]