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' flat animals ') [3] is a phylum of free-living (non-parasitic) marine invertebrates. [4] [5] They are blob-like animals composed of aggregations of cells. Moving in water by ciliary motion, eating food by engulfment, reproducing by fission or budding, placozoans are described as "the simplest animals on Earth."
A variety of hypotheses have been advanced based on the few morphological characteristics of this simple organism that could be identified. More recently, a comparison of the Trichoplax mitochondrial genome suggested that Trichoplax is a basal metazoan—less closely related to all other animals including sponges than they are to each other. [16]
Rather than being tooth-like, the mandibles of such insects are lengthened into stylets, which form the outer two parts of the feeding tube, or beak. The mandibles are therefore instrumental in piercing the plant or animal tissues upon which these insects feed, and in helping draw up fluids to the insect's mouth.
Through subsequent research, it became apparent that not every cleft head nor every downturned mouth represented a werejaguar. [9] Some researchers have therefore refined the werejaguar supernatural, specifically equating it with the Olmec rain deity, [10] a proposition that artist, archaeologist, and ethnographer Miguel Covarrubias had made as early as 1946 in Mexico South.
The premaxilla is unattached to the neurocranium (braincase); it plays a role in protruding the mouth and creating a circular opening. This lowers the pressure inside the mouth, sucking the prey inside. The lower jaw and maxilla (main upper fixed bone of the jaw) are then pulled back to close the mouth, and the fish is able to grasp the prey ...
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So simple pointed oval shapes for the eyes, triangles for the nose, ears and cat's mouth are characteristic of this painting. The bird shows a similar wavy reduced line in the drawing to the eye area of the cat and is reminiscent of Klee's depictions of the graphic meaning of the active, medial and passive lines in their curved form. [4] [5] [6 ...
In the 1994 book Planet Ocean: A Story of Life, the Sea, and Dancing to the Fossil Record, author Brad Matsen and artist Ray Troll describe and depict a reconstruction based on the information gleaned by Bendix-Almgreen (1966). They proposed that no teeth were present in the animal's upper jaw, besides crushing teeth for the whorl to cut against.