![]() The open circulatory system of the crayfish has no veins. Old procuticle separates from epidermis which secretes a new epicuticle, new exocuticle is secreted as molting fluid dissolve the old endocuticle, at ecdysis, the old cutcles are discarded, and in postechdysis, new cuticle is stretched and unfolded, and endocuticle is secreted. Moulting or ecdysis is the periodical shedding of the external part of the cuticle. Made up of an outer exocuticle (before molting) and the inner endocuticle (after molting).Įpicuticle is the outer layer and is much thinner than the procuticle. Procuticle is the inner layer and is covered with a thin, waxy, water-resistant out layer containing no chitin. Non-arthropods growth is linear/exponential continual gradual growth until maximal genetic size is reached. The unprotected and vulnerable arthropod body then undergoes a period of rapid growth, forming a new cuticle or exoskeleton. Can be seen in damp areas such as watering troughs, streams, puddles, and cisterns parasitize arthropods.Īrthropods grow by molting, a process in which the exoskeleton (its rigidity does not allow room from growth) is periodically shed. Nematomorphs: Nematomorpha is a phylum of parasitic animals that are superficially morphologically similar to nematode worms. A species that infests human intestines and rectum. Pinworm: Any of various small nematode worms of the family Oxyuridae that are parasitic on horses, rabbits, and other mammals. Heartworm: A filarial worm transmitted by mosquitoes and parasitic in the heart and associated blood vessels of dogs and other canids ![]() Hookworm: any of numerous small parasitic nematode worms of the family Ancylostomatidae, having a hooked mouthpart with which it fastens itself to the intestinal walls of its host, causing ancylostomiasis. Trichinella: a nematode genus in the aphasmid group that causes trichinosis in humans and other carnivores Nematode: any of several worms of the Phylum Menatoda, having unsegmented, cylindrical bodies, often narrowing at each end, and including parasitic forms such as the hookworm and pinworm. Elephantiasis: Chronic, often extreme enlargement and hardening of cutaneous and subcutaneous tissue, especially of the legs and external genitals, resulting from lymphatic obstruction and usually caused by infestation of the lymph glands and vessels with a filarial worm. ![]()
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