Ref ID : 629
Wolfgang Hofmann; On morphological variation in Keratella cochlearis populations from Holstein lakes (Northern Germany). Hydrobiologia 73:255-258, 1980
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Keratella cochlearis occurs in many Holstein lakes (northern Germany) as three well defined and separated forms: 'cochlearis', 'hispida', and 'tecta', each showing very little variation between the lakes. The present data show that the 'tecta' form did not originate from a Lauterborn cycle.