Topic
Pastinachus
About: Pastinachus is a research topic. Over the lifetime, 33 publications have been published within this topic receiving 518 citations.
Papers
TL;DR: A morphologically based review of 89 currently recognised species indicated that most of the currently recognised dasyatid genera are not monophyletic groups, and a reclassification of the family Dasyatidae is provided and seven new genus-level taxa are erected based on new morphological data.
Abstract: The higher-level taxonomy of the stingrays (Dasyatidae) has never been comprehensively reviewed. Recent phylogenetic studies, supported by morphological data, have provided evidence that the group is monophyletic and consists of four major subgroups, the subfamilies Dasyatinae, Neotrygoninae, Urogymninae and Hypolophinae. A morphologically based review of 89 currently recognised species, undertaken for a guide to the world’s rays, indicated that most of the currently recognised dasyatid genera are not monophyletic groups. These findings were supported by molecular analyses using the NADH2 gene for about 77 of these species, and this topology is supported by preliminary analyses base on whole mitochondrial genome comparisons. These molecular analyses, based on data generated from the Chondrichthyan Tree of Life project, are the most taxon-rich data available for this family. Material from all of the presently recognised genera ( Dasyatis, Pteroplatytrygon and Taeniurops [Dasyatinae]; Neotrygon and Taeniura [Neotrygoninae]; Himantura and Urogymnus [Urogymninae]; and Makararaja and Pastinachus [Hypolophinae]), are included and their validity largely supported. Urogymnus and the two most species rich genera, Dasyatis and Himantura , are not considered to be monophyletic and were redefined based on external morphology. Seven new genus-level taxa are erected ( Megatrygon and Telatrygon [Dasyatinae]; Brevitrygon, Fluvitrygon, Fontitrygon, Maculabatis and Pateobatis [Urogymninae], and an additional three ( Bathytoshia , Hemitrygon and Hypanus [Dasyatinae]) are resurrected from the synonymy of Dasyatis . The monotypic genus Megatrygon clustered with ‘amphi-American Himantura ’ outside the Dasyatidae, and instead as the sister group of the Potamotrygonidae and Urotrygonidae. Megatrygon is provisionally retained in the Dasyatinae pending further investigation of its internal anatomy. The morphologically divergent groups, Bathytoshia and Pteroplatytrygon, possibly form a single monophyletic group so further investigation is needed to confirm the validity of Pteroplatytrygon . A reclassification of the family Dasyatidae is provided and the above taxa are defined based on new morphological data.
174 citations
TL;DR: Three new species of diphyllidean cestodes are described from stingrays of the genus Pastinachus from the Indian and Pacific Oceans in that they bear lateral hooklets arranged in a continuous band across each lateral surface of the rostellum joining the groups of dorsal and ventral apical hooks.
Abstract: Three new species of diphyllidean cestodes are described from stingrays of the genus Pastinachus from the Indian and Pacific Oceans. All three new species differ from all but 10 of the 36 valid species of Echinobothrium van Beneden, 1849 in that they bear lateral hooklets arranged in a continuous band across each lateral surface of the rostellum joining the groups of dorsal and ventral apical hooks, rather than arranged in distinct dorsal and ventral groups, on each side of the apical hooks. Echinobothrium nataliae sp. n. ex Pastinachus solocirostris off Borneo differs from other relatives in the following combination of characters: number of spines in each column on the cephalic peduncle, number of lateral hooklets and number of apical hooks. Echinobothrium reginae sp. n. ex Pastinachus cf. sephen off Madagascar differs from all congeners in the following combination of characters: number of hooklets and number of spines on the cephalic peduncle. Echinobothrium vojtai sp. n. from an undescribed species of Pastinachus off Borneo differs from its congeners in the following combination of characters: number of hooklets, number of apical hooks and number of spines in each column on the cephalic peduncle. The hook formula was modified to accommodate species with lateral hooklets arranged in a continuous band as follows: {(LH) AH(A)/AH(B)}, where (LH) is the total number of lateral hooklets in a band. A table of all nominal species of Echinobothrium, showing their taxonomic status, type host and locality, number of peduncle spines in a column and hook formula, is presented. Macrobothridium djeddensis and Macrobothridium sinensis are transferred to Echinobothrium. In addition, Echinobothrium deeghai is considered as a species inquirenda.
47 citations
TL;DR: Dendromonocotyle octodiscus, the type species of the genus, is redescribed and illustrated, and supplementary data and illustrations for features of the other species ofThe genus are provided.
Abstract: The genus Dendromonocotyle contains seven previously described species: D. octodiscus Hargis, 1955; D. taeniurae Euzet and Maillard, 1967; D. kuhlii Young, 1967; D. cortesi Bravo-Hollis, 1969; D. akajeii Ho and Perkins, 1980; D. californica Olson and Jeffries, 1983; and D. centrourae Cheung and Whitaker, 1993. An eighth species, D. ardea sp. nov., is described from the dorsal body surface of the ray Pastinachus sephen (Forsskal) from Heron Island, Queensland, Australia. Dendromonocotyle ardea is distinguished from other species in the genus by the distinctive morphology of the terminal papillar sclerite, distal portion of the male copulatory organ and proximal portion of the vagina. An accessory chamber which may serve as a second seminal receptacle is also a differentiating character. Dendromonocotyle octodiscus, the type species of the genus, is redescribed and illustrated, and supplementary data and illustrations for features of the other species of the genus are provided. A key to the species of the g...
33 citations
1 Jan 2016
TL;DR: The Cowtail Stingray (Pastinachus ater) occurs across northern Australia, Papua New Guinea, West Papua, Indonesia and parts of the Solomon Islands, where it lives in intertidal lagoons, reef flats and reef faces, sandy habitats and estuaries at depths of up to 60 m, although it prefers shallow water as mentioned in this paper.
Abstract: The Cowtail Stingray (Pastinachus ater) occurs across northern Australia, Papua New Guinea, West Papua, Indonesia, and parts of the Solomon Islands, where it lives in intertidal lagoons, reef flats and reef faces, sandy habitats and estuaries at depths of up to 60 m, although it prefers shallow water.
This species is caught regularly in demersal tangle net, bottom trawl, longline, Danish seine and beach seine fisheries throughout its range. In the Arafura Sea, the Indonesian rhynchobatid fishery is very intensive and the level of exploitation is extremely high. Catches in inshore waters of the Arafura Sea have declined, and as a result these vessels have had to travel farther distances to sustain catches. This declining trend is likely to continue in future in the absence of management and because of continued, if not increasing, fishing effort. However, heavy fishing pressure in the Arafura Sea represents only a portion of this species' total range. It is considered common and the population appears to be healthy in northern Australia where fisheries are well-managed and effective gear modifications exclude large stingrays in prawn trawl fisheries. Furthermore, it occurs in some significant marine protected areas in Australian waters, including the Great Barrier Reef Marine Park. On account of its status in Australian waters, which represents a large portion of its range, it is assessed as Least Concern.
26 citations
TL;DR: It is demonstrated that Papillicotyle Young, 1967, distinguished previously from Decacotyle lymmae Young,1967 in part by the presence of unsclerotised accessory structures on the dorsal surface of the haptor, is synonymous with DecacOTyle.
Abstract: Close examination of type and new material of Decacotyle lymmae Young, 1967 revealed the presence of two unsclerotised structures on the dorsal surface of the haptor which were overlooked in the original description. We demonstrate that Papillicotyle Young, 1967, distinguished previously from Decacotyle Young, 1967 in part by the presence of unsclerotised accessory structures on the dorsal surface of the haptor, is synonymous with Decacotyle. D. tetrakordyle n. sp. is described from the gills of Pastinachus sephen (Forsskal) collected from Heron Island, Great Barrier Reef, Australia. D. tetrakordyle n. sp. is distinguished from the other four species in the genus by the presence of four accessory structures on the dorsal surface of the haptor and a complex male copulatory organ. Additional specimens of D. lymmae Young, 1967 from the gills of Taeniura lymma (Forsskal) and D. floridana (Pratt, 1910) n. comb and D. octona (Young, 1967) n. comb from the gills of Aetobatus narinari (Euphrasen) were also collected from the Queensland coast, Australia in the present study: D. youngi (Timofeeva, 1983) n. comb. is also transferred to Decacotyle from Papillicotyle. The Decacotylinae Chisholm, Wheeler & Beverley-Burton, 1995 is revised based on examination of type material, material of the new species and additional material of three previously described species. The oncomiracidium of D. floridana is described. A key to species is given and a description is provided of anterior glands containing needle-like secretion located lateral to the pharynx not described previously in D. lymmae. The discovery of D. floridana at Heron Island and D. octona in Moreton Bay represent new locality records for these species.
23 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
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| 2021 | 2 |
| 2020 | 1 |
| 2019 | 1 |
| 2018 | 4 |
| 2017 | 1 |
| 2016 | 4 |