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Species of Tetracanthella are characterised by possession of four prominent anal spines. Tetracanthella brachyura is a moderately common species found in bogs and mountains. It is black or dark blue, reaches a maximum length of 1.3 mm and has a mucro with two teeth (Fig. 1). The empodial appendage of the foot is only about 0.2 to 0.3 times as long as the claw. The map also includes records for Tetracanthella britannica Cassagnau, 1959 which Deharveng (1987) regarded as a junior synonym of Tetracanthella brachyura. It is probable that all the records for Tetracanthella pilosa in UK/Eire are in fact Tetracanthella brachyura (see map of Tetracanthella pilosa for details).
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