Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 *J Fig. 7.—Tanganyika snails: a, Tiphobia horei; b, Paramelania damoni; c, Lavi- geria diademata; d, Limnotrochus kirki. After Lauterborn. of ten genera of fresh water mollusks, has only one endemic genus. The same phenomenon characterizes fresh-water insects. The tropical and temperate representatives of the Dytiscidae are more alike than in any other family of beetles. Among species, the dytiscid Ere
Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 *J Fig. 7.—Tanganyika snails: a, Tiphobia horei; b, Paramelania damoni; c, Lavi- geria diademata; d, Limnotrochus kirki. After Lauterborn. of ten genera of fresh water mollusks, has only one endemic genus. The same phenomenon characterizes fresh-water insects. The tropical and temperate representatives of the Dytiscidae are more alike than in any other family of beetles. Among species, the dytiscid Eretes sticticiis is present on five continents, and Cybister tripunctatus has a range nearly as Some genera of water bugs, such as Ranatra and Notonecta, also have a wide distribution. There is thus a contradiction between the high degree of isolation of bodies of fresh water and the degree of differentiation of their faunae. The presence of the same species in the tropics and in the temperate zones is not explainable by a greater uniformity of environ- ment in fresh waters as compared with terrestrial A satisfactory explanation of this contradiction was presented by Thomas Belt by calling attention to the transitory nature of lakes and
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