An arthropod is a segmented body, and jointed appendages. They are characterized by their jointed limbs and cuticles. Their body plan consists of repeated segments, each with appendages and their versatility has enabled them to become the most species- rich members of all ecology in most environment.
Aname atra (black wishbone spider)
Spiders are split into two types of feeding groups decided of their manipulation of their prey. Spiders digest their food externally and the sharpness of their teeth decide what they can and can’t eat which also decides what they can and can’t digest. They have enzymes that are injected into their food that break down either carbohydrates or plant plectins. Depending on the food that they eat, some spiders have fat and protein enzymes that help their external digestion.
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Signeta flammeata (Bright Shield-skipper)
Butterflies are another species that’s digestive system also depends on what they eat. Butterflies feed exclusively on liquids which may include nectar, dissolved pollen, mineralized water, urine, sweat, bodily fluids from decomposing animal corpses. After the food enters the digestive tract, enzymes extract proteins and minerals from the food. After digestion and extraction of proteins and other minerals the waste matter is expelled from the anus either in liquid form, or as tiny faecal pellets.
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Liocarcinus Vernalis (Vernal crab)
The digestive tract begins with the bristly mouth and continues with a cuticle-lined esophagus. This turns backwards into the proventriculus. The food then passes into the gizzard here food is reduced to a pulp. Undigestible pieces, such as fish bones or large shell pieces, are regurgitated. The pulverized food is passed into the midgut and there it is digested and the food finally leaves through the anus which is at the base of the rectum.
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