![Fresh-water biology. Freshwater biology. 862 FRESH-WATER BIOLOGY 15 (16) Genital flaps present, acetabula 3, knob-like. Panisus Koenike 1896. Similar to the preceding in appearance; with chitinous plates more or less developed, Fresh-water biology. Freshwater biology. 862 FRESH-WATER BIOLOGY 15 (16) Genital flaps present, acetabula 3, knob-like. Panisus Koenike 1896. Similar to the preceding in appearance; with chitinous plates more or less developed,](https://c8.alamy.com/comp/RDA34M/fresh-water-biology-freshwater-biology-862-fresh-water-biology-15-16-genital-flaps-present-acetabula-3-knob-like-panisus-koenike-1896-similar-to-the-preceding-in-appearance-with-chitinous-plates-more-or-less-developed-in-our-one-described-species-covering-most-of-the-dorsal-surface-one-species-p-cata-phractus-described-by-koenike-1895-from-canada-about-12-mm-in-length-fig-1327-panisus-calapkra-tus-koenike-epimeral-area-genital-area-and-madllary-shield-x-43-outer-side-left-palpus-x-93-after-koenike-16-15-no-genital-flaps-numerous-stalked-acetabula-spor-RDA34M.jpg)
Fresh-water biology. Freshwater biology. 862 FRESH-WATER BIOLOGY 15 (16) Genital flaps present, acetabula 3, knob-like. Panisus Koenike 1896. Similar to the preceding in appearance; with chitinous plates more or less developed,
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