Abstract:
:Thaumatocotyle pseudodasybatis Hargis, 1955, has previously been described from Aetobatus narinari in the Atlantic and subsequently recorded from the Pacific. Aetobatus cf. narinari is now considered a species complex; as monocotylids are often strictly species specific, we test the hypothesis that detailed examination of specimens of monocotylids from rays from various localities could reveal morphological differences and eventually help our understanding of the systematics of the host. T. pseudodasybatis, previously known from seven specimens only, is redescribed from an additional 26 specimens from the South Pacific (off New Caledonia, Australia and Ranguiroa, French Polynesia), all from Aetobatus cf. narinari. The female reproductive organs are described in detail. The distal extremity of the male sclerotised copulatory organ, described in detail for the first time, shows a characteristic pattern of longitudinal striations on its edge that might be useful for future distinction from other species. The development of the male and female organs in juveniles is described, showing that growth of the male sclerotised copulatory organ begins with its basal part and precedes development of the ejaculatory bulb. Specimens from New Caledonia, Australia and French Polynesia had similar measurements and morphology, especially in the shape of the distal end of the male sclerotised copulatory organ; they were also similar to the holotype from the Atlantic. This suggests that all specimens from the Pacific and Atlantic belong to a single species; T. pseudodasybatis thus cannot be used to differentiate populations of Aetobatus cf. narinari, perhaps because this monocotylid is not strictly species-specific.
journal_name
Syst Parasitoljournal_title
Systematic parasitologyauthors
Marie AD,Justine JLdoi
10.1007/s11230-005-9017-3subject
Has Abstractpub_date
2006-05-01 00:00:00pages
47-55issue
1eissn
0165-5752issn
1573-5192journal_volume
64pub_type
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