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Loricifera (from Latin, lorica, corselet (armour) + ferre, to bear) is a phylum of very small to microscopic marine cycloneuralian sediment-dwelling animals with 43 described species. [3] and approximately 100 more that have been collected and not yet described. [4] Their sizes range from 100 μm to ca. 1 mm. [5]
Pseudoruminant is a classification of animals based on their digestive tract differing from the ruminants. Hippopotami and camels are ungulate mammals with a three-chambered stomach (ruminants have a four-chambered stomach) while equids ( horses , asses , zebras ) and rhinoceroses are monogastric herbivores.
Digestive system of ruminants [ edit ] Hofmann and Stewart divided ruminants into three major categories based on their feed type and feeding habits: concentrate selectors, intermediate types, and grass/roughage eaters, with the assumption that feeding habits in ruminants cause morphological differences in their digestive systems, including ...
For the same reason, however, new animals such as the mammoths also entered the ancient settlement areas of odd-toed ungulates, creating competition that led to the extinction of some of their lines. The rise of ruminants , which occupied similar ecological niches and had a much more efficient digestive system, is also associated with the ...
Nevertheless, artiodactyls were far from dominant at that time: the perissodactyls were much more successful and far more numerous. Artiodactyls survived in niche roles, usually occupying marginal habitats, and it is presumably at that time that they developed their complex digestive systems, which allowed them to survive on lower-grade food ...
These are subdivided into two groups based on the relative size of various digestive organs in relationship to the rest of the system: colonic fermenters tend to be larger species such as horses and rhinos, and cecal fermenters are smaller animals such as rabbits and rodents. [4]
The handicap of a heavy digestive system has increased selective pressure towards limbs that allow the animal to quickly escape predators. [35] Most species within Suina have a simple two-chambered stomach that allows for an omnivorous diet.
The trunk can roughly be divided into three regions — pharyngeo-brachial, digestive and genital — which are more or less distinct depending on the genus. [13] Like in vertebrates, the digestive system comprises in order a mouth, pharynx, oesophagus, stomach, intestine and rectum.