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This gradient of cell potency has been of particular interest to cell biologists and med- ical researchers because of its relevance to healing and regeneration potential in higher animals Asexual reproduction is an important feature of the life cycle of flukes, where the ability to reproduce asexu- ally helps ensure survival, particularly when potential mates may not be nearby. Ok, having explained what a sea apple actually is, let’s get down to the discussion of why they have such a dangerous reputation among reef aquarists.
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The chelicerae are smooth and adapted for slicing skin, and are together called the capitulum. The 6 CHAPTER NINETEEN Figure 19.3 Members of the order Acari. (A) The mite Zeroseius ometes (Parasitiformes). (B) A skin mite, Demodex (Acariformes), with very short legs. (C) A mange mite, Sarcoptes scabiei (Acariformes). (D) An adult chigger mite, Trombicula (Acariformes) A Monograph of the Fresh-Water download epub read A Monograph of the Fresh-Water Polyzoa, Including all the Known Species, both British and Foreign pdf, azw (kindle), epub, doc, mobi. The structure of the nervous system of any animal is related to its bauplan and mode of life. Consider first a radially symmetrical animal with limited powers of lo- comotion, such as a planktonic jellyfish or a sessile sea anemone. In such animals the major receptor organs are more or less regularly (and radially) distributed around the body; the nervous system itself is a noncentralized, diffuse meshwork generally called a nerve net (Figure 3.32A) Mealybugs and their Management download for free Mealybugs and their Management in Agricultural and Horticultural crops pdf, azw (kindle). The tip of the scolex in many cestodes (e.g., Taenia) is equipped with a movable hook- bearing rostellum, which is sometimes retractable into the scolex Bibliography of Onchocerciasis read Bibliography of Onchocerciasis here. Description of a new species of Oligobrachia (Pogonophora) from the North Atlantic, with a survey of the Oligobrachiidae. Horizontal and vertical distribution of Pogonophora in the Atlantic Ocean , source: Reptilian nematodes from South read for free read online Reptilian nematodes from South Asia. For example, a compound that is active against the herpes virus (belonging to a class of chemicals called arabinosides) has been found in the tropical sponge Cryptotethya crypta. Some sponges, including the west Pacific species Luffariella variabilis, produce a remarkable terpenoid compound called manoalide that is not only an extremely powerful an- tibacterial compound but also acts as both an analgesic and anti-inflammatory agent download. In some species, both ocelli and compound eyes may function in this fashion. Many (probably most) insects also see ultraviolet light. Many insects release noxious quinone compounds to repel attacks. Perhaps best known in this regard are cer- tain Tenebrionidae, many of which stand on their heads to do so (Figure 17.32A) download online Practical Invertebrate Zoology, 1970, Biology Series, 356 pages with 140 figures. pdf.
Each segment of a polychaete (“many setae”) has a pair of paddlelike or ridgelike parapodia (“almost feet”) that function in locomotion. Each parapodium has several chitinous setae. In many polychaetes, the rich blood vessels in the parapodia function as gills , source: Eight-Legged Marvels: Beauty download pdf
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