Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 8

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Two new species of entobdelline skin parasites [Monogenea, Capsalidae] from the blotched fantail ray, Taeniura meyeni, in the Pacific Ocean, with comments on spermatophores and the male copulatory apparatus

100%
Whittington I. D., Kearn G. C.
Acta Parasitologica
|
2009
|
tom 54
|
nr 1
12-21
We made a comparative anatomical study of entobdelline monogenean skin parasites from the blotched fantail ray, Taeniura meyeni (= T. melanospila) from public aquaria and fish-holding facilities distributed widely across the western Pacific Ocean. These facilities were located in Australia (Mooloolaba, southern Queensland; Cairns, northern Queensland), Taiwan and Japan. The capture localities of the aquarium fishes are unknown to us, with the exception of the individual fish from northern Queensland which came from Sudbury Reef, a local inshore reef. Entobdellines from southern Queensland differed morphologically from those from northern Queensland and Taiwan and the 2 new monogenean species are described and named Neoentobdella garneri sp. nov. and N. taiwanensis sp. nov., respectively. We determined that an entobdelline collected by Dyer and co-workers from a ray identified as T. melanospila (= T. meyeni) from an aquarium in Okinawa, Japan and identified by them as Entobdella squamula (Heath, 1902) Johnston, 1929 was misidentified and is tentatively assigned to N. taiwanensis sp. nov. The male copulatory organ of each new species resembles a penis, but evidence that these organs are eversible like a cirrus is presented. Caution is advised in deciding whether the male copulatory organs of capsalids may function as a penis or as a cirrus and we suggest that possession of a penis versus a cirrus may not necessarily indicate wide evolutionary divergence. In N. garneri, spermatophores consist of a sausage-shaped capsule and a long hollow stalk. A spermatophore received from a donor is anchored in the vagina by means of the stalk, with the capsule protruding outside the body.
2

Trimusculotrema heronensis sp.nov. [Monogenea, Capsalidae] from the skin of the pink whipray Himantura fai [Elasmobranchii, Dasyatidae] from Heron Island, Queensland, Australia

100%
Whittington I. D., Kearn G. C.
Acta Parasitologica
|
2008
|
tom 53
|
nr 3
Trimusculotrema heronensis sp. nov. is described from the skin of the pink whipray, Himantura fai, caught at Heron Island on the Great Barrier Reef, Queensland, Australia. The parasite differs from its closest relative, T. uarnaki, by its greater size and by features of the cirrus. There is evidence that the haptor of T. heronensis secretes cement. The living parasite is unable to swim. Whether Trimusculotrema spp. are benedeniines or entobdellines is discussed.
3

Neoentobdella gen.nov. for species of Entobdella Blainville in Lamarck, 1818 [Monogenea, Capsalidae, Entobdellinae] from stingray hosts, with descriptions of two new species

100%
Kearn G. C., Whittington I. D.
Acta Parasitologica
|
2005
|
tom 50
|
nr 1
The knowledge that entobdelline (capsalid) monogeneans formerly in Entobdella fall into two natural groupings provides the background to this paper. It is proposed to retain Entobdella for E. hippoglossi (type species), E. pngetensis and E. soleae from teleost flatfishes and to erect Neoentobdella gen. nov. for those parasites formerly in Entobdella but infecting elasmobranch flatfishes (mostly dasyatid stingrays but one report from a rhinobatid host). Neoentobdella diadema comb. nov. is designated type species for the new genus, which also includes N. apiocolpos comb, nov., N. australis comb, nov., N. bumpusii comb. nov. and two new species, N. natans sp. nov. and N. parvitesticulata sp. nov. from the dasyatid stingrays Pastinachus sephen and Hifnantura fai, respectively, caught off the Great Barrier Reef, Queensland, Australia. A prominent feature of all Neoentobdella species is the possession of anterior adhesive pads with transverse rays, resembling a diadem, but the close relationship between N. natans and N. parvitesticulata is underlined by the presence in both species of a muscular pad armed with microsclerites inside the genital atrium and elaborate fleshy lips and folds on the dorsal surface near the common genital opening. Adults of both species are also able to swim. The validity of Pseudoentobdella pacifica is confirmed. Entobdellinae Bychowsky, 1957 is revised to accommodate the recently established Listwcephalos, as well as the proposal of Neoentobdella.
4

A new genus and new species of microbothriid monogenean [Platyhelminthes] with a functionally enigmatic reproductive system, parasitic on the skin and mouth lining of the largetooth sawfish, Pristis microdon, in Australia

81%
Kearn G. C., Whittington I. D., Evans-Gowing R.
Acta Parasitologica
|
2010
|
tom 55
|
nr 2
115-122
Dermopristis paradoxus gen. et sp. nov., a microbothriid monogenean parasite from the skin and mouth lining of the largetooth sawfish, Pristis microdon (Elasmobranchii, Pristidae) in Australia, is described. The parasite has 2 juxtaposed testes and differs from other microbothriids in possessing a unique and unusual terminal male reproductive tract comprising a proximal and a distal tube, the latter with a conspicuous opening on the ventral surface and lacking a recognisable male copulatory organ. The smalltooth sawfish, P. pectinata, also has a skin-parasitic microbothriid, Dermophthirioides pristidis Cheung et Nigrelli, 1983, but this parasite species has a prominent copulatory papilla. Dermopristis paradoxus also has parallel ridges with broad tops running in a roughly transverse direction across the ventral surface of the body. The ventral ridges are prominent from the level of the pharynx to the posterior region of the body. The function of the ridges is unknown. Reproductive biology, attachment and feeding in D. paradoxus are discussed. In the absence of unmounted parasite specimens for sectioning, a mounted specimen of D. paradoxus was released from the slide and successfully processed to provide serial, stained, resin sections. This useful technique is recommended to provide anatomical information in situations where only specimens on slides are available for study.
5

Polyopisthocotylean monogeneans from carangid fishes off Queensland, Australia and New Caledonia, with a description of Heteromicrocotyloides megaspinosus sp.nov.

81%
Barton D. P., Beaufrere C., Justine J.-L., Whittington I. D.
Acta Parasitologica
|
2009
|
tom 54
|
nr 3
205-217
Gills of carangid fishes in Australian waters are dominated by a diversity of polyopisthocotylean monogeneans. This study updates current knowledge of polyopisthocotyleans from carangid hosts in waters along the Queensland coast of Australia and also off New Caledonia. The discovery of Protomicrocotyle celebesensis Yamaguti, 1953 is the first record for the genus in Australian waters and represents a new geographic location for the species, extending its distribution from Sulawesi, Indonesia and Hawaii to Australia. Furthermore, Caranx ignobilis and Carangoides fulvoguttatus are reported as new host records for P. celebesensis. Carangoides gymnostethus is recorded as a new host for Heteromicrocotyla australiensis Rohde, 1977 from a new geographic location, namely Lizard Island, Queensland. Heteromicrocotyloides mirabilis Rohde, 1977 is reported from the gills of C. fulvoguttatus off Lizard Island, Queensland representing a new geographic record. Heteromicrocotyloides megaspinosus sp. nov. is described from the gills of C. fulvoguttatus from Lizard Island, Queensland and New Caledonia. The new species is distinguished from H. mirabilis by the larger number and size of spines in the male genital corona. Gonoplasius carangis was collected from Pseudocaranx dentex at Heron Island, Queensland. Gonoplasius longirostri is synonymised with G. carangis due to overlap in measurements and similar morphology. The number of ‘dorsal pits’ in this taxon may not be a useful character because they can be cryptic and hard to see. Most hosts from which these two Gonoplasius species have been collected previously have been synonymised as Pseudocaranx dentex except Caranx ascensionis which is now considered to be C. lugubris. Our report of G. carangis from P. dentex at Heron Island, Queensland is a new geographic record.
6

Using the giant Australian cuttlefish (Sepia apama) mass breeding aggregation to explore the life cycle of dicyemid parasites

81%
Catalano S. R., Whittington I. D., Donnellan S. C., Gillanders B. M.
Acta Parasitologica
|
2013
|
tom 58
|
nr 4
Dicyemid mesozoan parasites, microscopic organisms found with high intensities in the renal appendages of benthic cephalopods, have a complex, partially unknown life cycle. It is uncertain at which host life cycle stage (i.e. eggs, juvenile, adult) new infection by the dispersive infusoriform embryo occurs. As adult cephalopods have a short lifespan and die shortly after reproducing only once, and juveniles are fast-moving, we hypothesize that the eggs are the life cycle stage where new infection occurs. Eggs are abundant and sessile, allowing a huge number of new individuals to be infected with low energy costs, and they also provide dicyemids with the maximum amount of time for survival compared with infection of juvenile and adult stages. In our study we collected giant Australian cuttlefish (Sepia apama) eggs at different stages of development and filtered seawater samples from the S. apama mass breeding aggregation area in South Australia, Australia, and tested these samples for the presence of dicyemid DNA. We did not recover dicyemid parasite cytochrome c oxidase subunit I (COI) nucleotide sequences from any of the samples, suggesting eggs are not the stage where new infection occurs. To resolve this unknown in the dicyemid life cycle, we believe experimental infection is needed.
7

Spermatophores in Dermopristis cairae Whittington et Kearn, 2011 (Monogenea, Microbothriidae)

81%
Kearn G. C., Whittington I. D., Evans-Gowing R.
Acta Parasitologica
|
2011
|
tom 56
|
nr 4
Spermatophores are described in the microbothriid monogenean Dermopristis cairae from the giant shovel-nosed ray, Glaucostegus typus (Elasmobranchii, Rhinobatidae). Each spermatophore consists of a fusiform capsule containing sperm and a hollow stalk. The proximal ends of the stalks of fully formed spermatophores were open and located in a recess on the ventral surface close to, but not inside, the vagina and the male reproductive opening. Three adult parasites carried spermatophores attached externally to the ventral surface. One individual carried 3 spermatophores and 2 others a single spermatophore. In addition, in 2 adults, short lengths of what appeared to be stalk remnants were observed attached near the reproductive openings. With regard to spermatophore exchange, the evidence in support of the following 2 possibilities is discussed. (1) Adult specimens of D. cairae carrying fully formed spermatophores ventrally are recipients not donors, having received their spermatophores singly during mating events. (2) Spermatophore carrying adults are donors, their spermatophores being freshly made and on offer to a potential mate. The evidence points to the first of these alternatives as the most likely but this is not conclusive and requires observations on mating between living parasites.
8

Pseudoleptobothrium aptychotremae Young, 1967 [Monogenea, Microbothriidae] redescribed from a new host, Trygonorrhina fasciata [Rhinobatidae] in South Australia with a description of the larva and post-larval development

80%
Glennon V., Chisholm L. A., Whittington I. D.
Acta Parasitologica
|
2006
|
tom 51
|
nr 1
The adult of Pseudoleptobothrium aptychotremae Young, 1967 (Monogenea, Microbothriidae) is redescribed from the dermal denticles of the southern fiddler ray, Trygonorrhina fasciata (Rhinobatidae) collected off Adelaide, South Australia. This is a new host and locality record. The anatomy of the larva is described from observations of live larvae and the presence of six needle-like spicules in the larval haptor is confirmed. The development of P. aptychotremae is also described.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.