. Bulletin of the Natural History Museum Zoology. REVISION OF SIMOCEPHALUS DAPHNIIDAE. Fig. 8 5. vetulus. A. 1st limb of female, B. hook of endopod of 1st limb of adult male. C, 1st limb of male. D, hook of endopod of 1st limb of juvenile male. Distribution. (Fig. 21) Europe, North Africa. This species was previously assumed to be cosmopolitan (Manujlova, 1964). But the investigation of specimens from different regions shows, that S. vetulus occurs in Europe and North Africa only. In other regions it is replaced by closely related species: S. mixtus, S. vetuloides, S. gibbosus, S. elizabethae
. Bulletin of the Natural History Museum Zoology. REVISION OF SIMOCEPHALUS DAPHNIIDAE. Fig. 8 5. vetulus. A. 1st limb of female, B. hook of endopod of 1st limb of adult male. C, 1st limb of male. D, hook of endopod of 1st limb of juvenile male. Distribution. (Fig. 21) Europe, North Africa. This species was previously assumed to be cosmopolitan (Manujlova, 1964). But the investigation of specimens from different regions shows, that S. vetulus occurs in Europe and North Africa only. In other regions it is replaced by closely related species: S. mixtus, S. vetuloides, S. gibbosus, S. elizabethae and S. punctatus. Remarks. The original description of S. vetulus is very short: 'Daphne Vetula cauda inflexa, testa mutica' (Mtiller, 1776). This is appropriate for any species of Simocephalus. Later, Miiller (1785) renamed this species Daphnia sima. The name "vetulus' is not grammatically correct (Dumont, 1977). 'Vetula means 'an old women'. This is not an adjective, but a substantive. Its gender cannot alter. However, it is not necessary to change the name 'S. vetulus', because it has come into common use. Some authors in the 19th century (Lievin, 1848; Baird, 1850; Leydig, 1860) supposed S. exspinosus and S. congener to be syno- nyms of S. vetulus. According to recent data, S. vetulus differs very much from these species and even belongs to another subgenus. According to Jurine (1820), S. nasutus (Monoculus nasutus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Museum (London). Andover : Intercept
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