The terrestrial Onychophora with ca. 160 species inhabit a girdle around the equator. In the southern hemisphere they extend through the tropics and subtropics and reach into temperate regions. The discontinuous distribution seen today is explained by the hypothesis of their existence on the formerly connected land mass of Gondwanaland (STORCH & RUHBERG 1993).
KeywordsCorneagenous Cell Antennal Segment Body Wall Musculature Stem Lineage Retinula Cell
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