THE VARIED ROLES OF SNAILS - National Universities Commission

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Adults of Achatina achatina 142
Shells of Biomphalaria pfeifferi 143
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THE VARIED ROLES OF SNAILS (GASTROP
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1820 and twice that in 1930 (Martin
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contributions of snails to human ex
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a.) Production from the wild (wild
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Gastropods I: Terrestrial or Garden
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contracts and expands and this crea
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live on the surface so that they ca
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Many members of the Carrier shell f
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Most bivalves reproduce by laying m
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the snails, what is true of one spe
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principle, is a rasping tongue with
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sculptural defenses against crushin
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Fig. 6: Shells of different freshwa
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ight larval retractor i.e. establis
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(iii) The hypertrophy of the right
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ys two present kidneys 5. Operculum
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organs of some species and found si
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imperative for the ecosystem dynami
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oth of a direct and an indirect nat
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females.. Self fertilization is a c
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emerges and goes on a binge of repl
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of spermatozoa in males or stimulat
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d. LIFE CYCLE & LIFE BUDGET SUDIES:
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competitively loosely packed. With
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digestible vegetable. Tough plants
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Birds Various ducks Storks Kites Ot
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when mineral ions form chelate comp
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produce stress. Thus snail distribu
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Protein (g): 16 Availablecarbohydra
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or cocoyam, and palm oil or pea nut
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1925, 1931, at Angola and Namibia;
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meat with garlic. British species a
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4. Helicinidae 5. Fissurellidae 6.
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Helix nucuea Helix aperta Arianta a
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Archachatina calachatina marinae Ar
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sites in North Africa but are also
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infect man or animals. The five pri
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Okafor (1989, 1990, and 1992), Ozum
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P. aurita P. byronensis Gyraulus G.
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one miracidium the potential of pro
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In the snail the miracidium metamor
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While Potadoma and Semisulcospira s
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Clonorchiasis is caused by Clonorch
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Table 7: Showing a list of trematod
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promising and show reduction of pai
Page 91 and 92: memory loss have a devastating cons
Page 93 and 94: acteria. This bacteriostatic activi
Page 95 and 96: The thin, quickly leached soils of
Page 97 and 98: Snails are also pests of crops wher
Page 99 and 100: (f) The management of the snail far
Page 101 and 102: flakes or maize chaffs and mostly g
Page 103 and 104: important that they are separated i
Page 105 and 106: The profit = 1, 800,000 - 30,000 =
Page 107 and 108: designs that are very attractive an
Page 109 and 110: cornuarietis or of flatworms as bio
Page 111 and 112: In few location of the world, snail
Page 113 and 114: damages to crops. So, they must be
Page 115 and 116: 115
Page 117 and 118: The Nigerian Field, 44 (4), 130-144
Page 119 and 120: 19. Asibey, E. O. A. and child, G.
Page 121 and 122: 32. Dei, G. J. S. (1989). Hunting a
Page 123 and 124: J. moll. Studies, 64 (2), 173-181.
Page 125 and 126: 56. Lux moore, R. (1985). Game farm
Page 127 and 128: 69. Okafor, F. C. (1989). Consumpti
Page 129 and 130: Proc. Symposium organized by the Br
Page 131 and 132: Chronicle Nautilus Batavia, 104,278
Page 133 and 134: Achatina fulicaBowdich,1822 Shell s
Page 135 and 136: Achatina immaculata Lamarck,1822 Sh
Page 137 and 138: Achatina stuhlmanni von Martens,189
Page 139 and 140: Columna leai(Tryon, 1866) : São To
Page 141: Shells of Gyraulus costulatus 141
Page 145 and 146: Shells of Lanistes varicus and oper
Page 147 and 148: 147
Page 149 and 150: Courtesy of Yurii Yashin Courtesy o
Page 151 and 152: Yurii Yashin Yurii Yashin Yurii Yas
Page 153: 153
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THE VARIED ROLES OF SNAILS - National Universities Commission

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