A pseudoruminant is the classification of an animal based on its digestive tract. These types of animals are still considered foregut-fermentors, but only have three chambers in their stomach, not four like true ruminants do. Pseudo means "false". So they are "false" ruminants.
The chambers are basically the reticulum, omasum and abomasum. They do not have the characteristic rumen that identifies ruminants as ruminants. The animals that are often referred to as pseudoruminants are all camelids (camels, alpacas, llamas, etc.)
Camels have a three-chambered stomach, not four. True ruminants have the typical four-chambered stomach, but camelids like camels do not. They also lack the characteristic rumen, only having the reticulum, omasum and abomasum.
connects the ileum with the asending colon to the large intestine It is important to note that this is not an obligatory connection in many species. As far as function, it serves fermentation purposes in herbivores, allowing them to further digest fibers normally unavailable to them. Horses (and animals with similar digestive systems like rabbits) will have the most large and functional cecae, followed by ruminant and pseudoruminant animals (like cows and camelids, respectively). Obligate carnivores, like cats, will have the least functional cecae.
No. Camelids like alpacas, llamas and camels are pseudo-ruminants because they have the same foregut-fermentor activity as true ruminants do, but lack the rumen, since they only have three chambers in their stomach, not four. Rabbits are not considered pseudo-ruminants because they have a simple stomach and don't chew cud like pseudo-ruminants and ruminants do--even re-eating their feces doesn't even count as classifying a rabbit as a psuedo-ruminant. Thus they are simply hind-gut fermentors, and a monogastric.