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On Apus: its rediscovery in Britain, nomenclature and habits
Author(s) -
FOX H. MUNRO
Publication year - 1949
Publication title -
proceedings of the zoological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0370-2774
DOI - 10.1111/j.1096-3642.1949.tb00897.x
Subject(s) - biology , zoology , ecology
S ummary .1 Until 1948 Triops cancriformis (Bosc) had only been recorded five times in Britain, namely in 1738, 1816, about 1830, in 1907 and 1935. It has been found again in 1947 and 1948 in the same Hampshire pool from which it was recorded in 1935; it seems thus to be endemie. 2 A historical account is given of the two best‐known species of Notostraca, Triops cancriformis (Bosc) and Lepidurus apus (L.). 3 It is proposed to suppress the Linnaean genus Monoculus.4 In Triops , as in Daphnia , the amount of haemoglobin in the blood is inversely proportional to the oxygen content of the water in which the animal lives. 5 Triops swims up to the water surface in response to a stimulus of oxygen deficiency more often when its blood is poor than when it is rich in haemoglobin. 6 The paired eyes of Triops are in continual movement, like the eye of Daphnia and the eyes of crayfish. The trembling movement may assist the animals to perceive objects in the surroundings.