Showing papers on "Digenea published in 2003"
TL;DR: The composition of the parasite fauna differed between the fish species, in accordance with their different feeding behaviours, and the diet of bentho-pelagic feeders was more diverse in comparison with the more specialised benthic feeders, which correlated with the lower diversity of heteroxenic parasites within both small-sized benthIC fish species.
Abstract: The metazoan parasites and stomach contents of the small-sized demersal fishes Agonus cataphractus, Buglossidium luteum, Callionymus lyra and Rhinonemus cimbrius were studied and analysed. The fishes were captured using various sampling gears at 12 stations in the central North Sea. A total of 16 metazoan parasite species were isolated: six adult Digenea, three larval and adult Cestoda, four larval and adult Nematoda and three larval and adult Crustacea. With nine parasites species each, A. cataphractus and R. cimbrius harboured the highest parasite diversity, while B. luteum and C. lyra hosted only six and five parasite species, respectively. Eighteen new hosts and four new locality records were established. No Myxozoa, Monogenea or Acantho- cephala were found. Most of the detected parasites showed a wide geographical range and a low host- specificity. The composition of the parasite fauna dif- fered between the fish species, in accordance with their different feeding behaviours. The diet of bentho-pelagic feeders (A. cataphractus, R. cimbrius) was more diverse in comparison with the more specialised benthic feeders (C. lyra, B. luteum). This correlated with the lower diversity of heteroxenic parasites within both small-sized benthic fish species.
46 citations
Journal Article•
TL;DR: The study showed the Vistula Lagoon cyprinid and percid parasite fauna to be dominated by freshwater species, frequencies of their occurrence in the brackishwater lagoon being lower than those in freshwater reservoirs.
Abstract: A total of 2398 fish specimens (1091 Percidae and 1307 Cyprinidae) belonging to 16 species (3 Percidae and 13 Cyprinidae), caught in the Polish part of the Vistula Lagoon were examined within December 1994-March 1997. The parasites found were identified as belonging to 63 taxa (61 species as well as Diplostomum spp. flukes and glochidia Unionidae gen. sp. which could not be identified to species) of the Microsporea (1), Protozoa (1), Myxozoa (2), Monogenea (10), Digenea (15), Cestoda (11), Nematoda (11), Acanthocephala (5), Hirudinea (1), Mollusca (1), Copepoda (4), and Branchiura (1). The percids and cyprinids were found to support 37 and 40 parasitic taxa, respectively, the taxon-richest parasite fauna occurring in zander, Sander lucioperca (26 taxa), followed by carp bream, Abramis brama (24), European perch, Perca fluviatilis (24), roach, Rutilus rutilus (19), ruffe, Gymnocephalus cernuus (15), and Prussian carp, Carassius gibelio (11). The remaining fish species hosted less than 10 parasitic species each. Metacercariae of the genus Diplostomumn, found in about 37% of the fish examined, and Tylodelphys clavata, recorded in about 24% of the fish, proved the commonest parasites. The study showed the Vistula Lagoon cyprinid and percid parasite fauna to be dominated by freshwater species, frequencies of their occurrence in the brackishwater lagoon being lower than those in freshwater reservoirs. Frequencies of the 6 marine parasitic species found in the lagoon were, too, lower than those in the sea. It is suggested that some of the parasites (Ancyrocephalus paradoxus, Diplozoon paradoxum of the Monogenea, Diplostomum spp., Tylodelphys clavata of the Digenea, and Achtheres percarum of the Copepoda) prefer brackishwater habitats.
37 citations
TL;DR: In this paper, the entire life cycle of the Brazilian Echinostoma luisreyi n. sp., of the 37-collar spine E. revolutum group, has been observed under experimental conditions.
Abstract: The entire life cycle of the Brazilian Echinostoma luisreyi n. sp., of the 37–collar spine E. revolutum group, has been observed under experimental conditions. The snail Physa marmorata serves as its first natural intermediate host. This species and the planorbid Biomplalaria glabrata act as experimental second intermediate hosts. The worm recovery rate was 51.3 and 0.6% for mice and hamsters, respectively, but the infection did not develop in the quail Coturnix coturnix. The natural vertebrate host is not known. The most important morphological character of the new species separating it from the other Echinostoma species studied is the oral corner spines that increase in size from the latero-oral to the ventro-oral regions. The ratio of the sizes of the smaller oral spines and the larger aboral ones was 1.7:1.0. Also, the excretory pore is radially wrinkled and dorsally subterminal. Images obtained by scanning electron microscopy confirmed the characters that differentiate the new species and the most cl...
33 citations
Journal Article•
16 citations
TL;DR: A new species of Catatropis from a freshwater pulmonate snail of the family Chilinidae, which is endemic to South America, is described and the characteristics of the larval stages are presented.
Abstract: A new species of Catatropis from a freshwater pulmonate snail of the family Chilinidae, which is endemic to South America, is described. Naturally infected Chilina dombeiana were collected from several localities in Andean Patagonia. The characteristics of the larval stages are presented. Experimentally reared adults, located in the distal portion of the intestinal caeca, were recovered from chickens and ducks. Adults of Catatropis chilinae n. sp. can be distinguished from all other species in having 9-11 (10) ventral glands, a cirrus-sac extending between the first third and the middle of the body, a metraterm slightly shorter or equal to the cirrus-sac, vitelline follicles reaching forward to the middle of the body, lobed testes, and a genital pore closely posterior to the caecal bifurcation. Eggs bear polar filaments only at the anopercular end. Rediae have only one or two cercariae. Shed cercariae are trioculate with a long tail and encyst in the environment, and metacercariae become infective 72 hours after encystment. This species is widely distributed between 40°10′ S and 43°09′ S and it is the first Catatropis species recorded for the Chilinidae and for Argentina.
12 citations
TL;DR: In the adult fish trematode Crepidostomum metoecus, four types of sensory receptors were observed inside the forebody teguments and one type beneath the tegument basal lamina, with nerve endings in close association with muscle fibres comparable with those in the Aspidogastrea.
Abstract: In the adult fish trematode Crepidostomum metoecus (Braun, 1900), four types of sensory receptors were observed inside the forebody tegument and one type beneath the tegument basal lamina. Two types of sensory receptors extend through the thickness of tegument and have a free cilium inside a pit (types I and II). Two types (III and IV) are nonciliate and entirely intra-tegumental in location. Type IV receptor with large horizontal and thin vertical rootlets was described earlier in aspidogastreans only. Below the basal lamina, nerve endings in close association with muscle fibres, comparable with those in the Aspidogastrea, were detected.
11 citations
TL;DR: The metacercariae of Acanthotrema felis Sohn et al., 2003 (Digenea: Heterophyidae) were discovered in a species of the brackish water fish, Acanthogobius flavimanus, in the Republic of Korea and verified as one of its second intermediate hosts.
Abstract: The metacercariae of Acanthotrema felis Sohn et al., 2003 (Digenea: Heterophyidae) were discovered in a species of the brackish water fish, Acanthogobius flavimanus, in the Republic of Korea. They were experimentally fed to kittens, and adult flukes were harvested 7 days later. The adults were morphologically characterized by the presence of a bipartite seminal vesicle, the ventral sucker associated with a ventrogenital sac enclosing 3 sclerites (2 long and pointed, and 1 short and thumb-like), and an unarmed gonotyl. The adult flukes were identified as A. felis Sohn et al., 2003, and the brackish water fish A. flavimanus has been verified as one of its second intermediate hosts.
10 citations
TL;DR: Numerous individuals of the poorly known species Lecithostaphylus retroflexus (Zoogonidae) and Tergestia acanthocephala (Fellodistomidae) have been recovered from the teleost fish Belone belone gracilis from off the Scandola Nature Reserve, Western Mediterranean.
Abstract: Numerous individuals of the poorly known species Lecithostaphylus retroflexus (Zoogonidae) and Tergestia acanthocephala (Fellodistomidae) have been recovered from the teleost fish Belone belone gracilis from off the Scandola Nature Reserve, Western Mediterranean. They are redescribed, incorporating previously undescribed features: for L. retroflexus, a post-oral ring, a bipartite seminal vesicle, the shape of the excretory vesicle, the subterminal excretory pore and the flask-shaped gland-cells associated with the distinctly pedunculate ventral sucker; and for T. acanthocephala, the intestinal bifurcation in the forebody, necessitating its return to the genus Tergestia from Theledera. Additionally, T. acanthocephala is compared with T. laticollis from various species of Trachurus from the same geographical area.
9 citations
TL;DR: A helminthological investigation was carried out on the lacertid lizard, Gallotia atlantica, from Lanzarote, Canary Islands (Spain), and it was concluded to be a new species which is here named Pseudoparadistomum yaizaensis gen. et sp.
Abstract: A helminthological investigation was carried out on the lacertid lizard, Gallotia atlantica (Peters and Doria, 1882) (Reptilia: Lacertidae) from Lanzarote, Canary Islands (Spain). One hundred and three digenean trematodes were found in the small intestine. Based on morphological and morphometric analysis of 35 specimens, it is concluded to be a new species which is here named Pseudoparadistomum yaizaensis gen. et sp. nov. referring to the locality where the hosts were caught. Pseudoparadistomum n.g. most closely resembles members of Paradistomum and Paradistomoidella, but is characterized by a V-shaped excretory vesicle, a spined tegument, and the position of the ovary relative to the testes.
8 citations
01 Jan 2003
7 citations
TL;DR: Auriculotrema lechneri n.
Abstract: Auriculotrema lechneri n. gen., n. sp. is described from the small intestine of Emydura krefftii and Elseya latisternum from northern Queensland, Australia. The new species strongly resembles species of Choanocotyle in body shape, ventral incision of the oral sucker, structure of the cirrus sac, and location of the genital pore. The distinctive taxonomic feature is the presence of 2 winglike projections extending beyond the lateral margins of the oral sucker, in contrast to the extremely large, expanded oral sucker diagnostic of Choanocotyle spp. Auriculotrema n. gen. is the second genus included in the formerly monotypic Choanocotylidae Jue Sue and Platt, 1998.
01 Jan 2003
TL;DR: Two new species of lepocreadiid trematodes are described from teleost fishes from off the coast of northern Tasmania.
Abstract: Two new species of lepocreadiid trematodes are described from teleost fishes from off the coast of northern Tasmania. Opechona kahawai sp. nov. from Arripis sp. (Arripidae) differs from congeners by a combination of a longer prepharynx, longer excretory vesicle and the genital pore antero-sinistral to the ventral sucker. Cephalolepidapedon warehou sp. nov. from Seriolella punctata (Centrolophidae) differs from its only congener in the vitellarium reaching into the posterior forebody, a heavy concentration of eye-spot pigment in the forebody,
a relatively narrower and more elongate body, a longer prepharynx and a more distinct oesophagus.
01 Jan 2003
TL;DR: A new species of Cladorchiidae (Trematoda, Digenea) was found in the intestinal tract of freshwater fish "pacu peva", Metynnis maculatus, from the Upper Parana River floodplain, southern Brazil.
Abstract: A new species of Cladorchiidae (Trematoda, Digenea) was found in the intestinal tract of freshwater fish "pacu peva", Metynnis maculatus (Kner, 1858) from the Upper Parana River floodplain, southern Brazil. The new species was classified in the genus Dadayius Fukui, 1929 by having non-lobate testis and a ventro-terminal acetabulum with postero median notch on rim, characters of the genus wich has only two previously known species. Some characters that differ the new species from D. marenzelleri (Daday, 1907) and D. pacuensis Thatcher, 1996 are: ceca not reaching acetabulum, vitellaria of limited extension, not reaching the level of posterior testis and the presence of two different egg sizes in two different maturity stages.
TL;DR: A new species of Podocotyloides is described from Sillago bassensis caught off the coast of Western Australia, the second report of a species of this genus from Australian waters but the first of a new species.
Abstract: A new species of Podocotyloides is described from Sillago bassensis caught off the coast of Western Australia. This is the second report of a species of this genus from Australian waters but the first of a new species. P. victori n. sp. is one of four species whose vitelline follicles extend into the forebody. It is distinguished from the other three species with vitelline follicles in the forebody by its relatively shorter forebody, smaller eggs and bipartite seminal vesicle. Pedunculotrema Fischthal & Thomas, 1970 is reduced to synonymy with Podocotyloides Yamaguti, 1934.
TL;DR: 2 new species of leucochloridiid-like brachylaimoid digeneans parasitizing a variety of birds in the Area de Conservación Guanacaste, Costa Rica are described, each of which is assigned to a new genus.
Abstract: We describe 2 new species of leucochloridiid-like brachylaimoid digeneans parasitizing a variety of birds in the Area de Conservacion Guanacaste, Costa Rica, each of which we assign to a new genus. According to Pojmanska's (Pojmanska, T. 2002a. Superfamily Brachylaimoidea Joyeux & Foley, 1930. In Keys to the Trematoda, D. I. Gibson, A. Jones, and R. A. Bray [eds.]. CAB International and The Natural History Museum, London, U.K., p. 31–36.) key for the Brachylaimoidea, we are unable to place either species in any family. One species most closely resembles members of Leucochloridium by having well-developed suckers, lacking an esophagus, and having cecal shoulders, gonads at the posterior end, and the genital pore at posterior end of body but differs by having symmetrical testes, a posttesticular ovary, and a terminal genital pore; thus, we propose the genus Bakkeius for it. The second new genus resembles members of Michajlovia by having ventral genital pores but differs by having extracecal uterine...
TL;DR: It is suggested that the continuous nature of M2 and M3 embryo development may well be similar to that postulated for ancestral digeneans.
Abstract: The parthenogenetic metacercarial stages of the gymnophallid trematode Cercaria margaritensis are found in the extrapallial cavity of the subtidal prosobranch mollusc Margarites helicinus . The primary metacercariae (M1) produce second-generation metacercariae (M2) which become independent and give rise to M3 metacercariae which are infective to the definitive host, the common eider ( Somateria mollissima ). This study used transmission electron microscopy to follow the development of M2 inside M1 organisms and M3 inside M2 organisms. The process is similar in both cases with embryos developing from individual cells from the parent body walls. In each case the brood sac was divided into brood chambers by multilaminated cells and both M2 and M3 embryos developed inside embryonic membranes that originated from specialized blastomeres. The tegument of M2 and M3 embryos developed in a similar manner underneath the embryonic membrane. Both the multilaminated cells and the embryonic membranes possessed features that indicated that they are involved in transport of nutrients. It is suggested that the continuous nature of M2 and M3 embryo development may well be similar to that postulated for ancestral digeneans.
01 Jan 2003
TL;DR: Urotocus fusiformis is reported parasitizing rectum of Pteroptochos tarnii a native bird from Argentinian Patagonian cold temperate forest.
Abstract: Urotocus fusiformis is reported parasitizing rectum of Pteroptochos tarnii (Rhinocryptidae) a native bird from Argentinian Patagonian cold temperate forest. Specimens were mounted “in toto” and morphometric data are given. Morphology and dimensions of these specimens conform to the original description. This is the first record for this host and for Argentina.
01 Jan 2003
TL;DR: It is concluded that the genus is best placed in the Stenakrinae although that subfamily may now be an artificial assemblage.
Abstract: Scorpidotrema longistipes n. g., n. sp. is described from the intestine of Scorpis georgiana Valenciennes (Scorpididae) from off Point Peron, Western Australia. The new genus is distinguished by the combination of a remarkably long and retractable ventral sucker peduncle, a possible uroproct, well-developed cirrus-sac and a uterine seminal receptacle. The subfamilial relationships of the new genus are troublesome. It incorporates features of the Opecoelinae, Stenakrinae and Plagioporinae. The absence of a canalicular seminal receptacle suggests a relationship with the Opecoelinae and Stenakrinae, whereas the well-developed cirrus-sac suggests a relationship with the Plagioporinae and Stenakrinae. The overall arrangement of the gonads is not similar to that of existing genera of Stenakrinae. It is concluded that the genus is best placed in the Stenakrinae although that subfamily may now be an artificial assemblage. This new genus forms part of a distinctive fauna of trematodes restricted to Australian southern temperate fishes.
TL;DR: An opecoelid, Bartoliella pritchardae n.
Abstract: An opecoelid, Bartoliella pritchardae n. g., n. sp., is described from the intestine of Epinephelides armatus from Western Australia. The new genus has been assigned to the subfamily Opecoelininae Gibson & Bray, 1984, bringing the number of genera in the subfamily to two. Although the new genus is similar to Opecoelina Manter, 1934 morphologically, the pedunculate ventral sucker and complete absence of a cirrus-sac necessitate the erection of a new genus. A formal re-definition of the subfamily is given, based on the diagnoses of the genera Opecoelina and Bartoliella n. g.
TL;DR: P. reversati is described from the temperate marine waters off south-west Western Australia and south-east Queensland and is distinguished from P. pagrosomi mainly in the position of the genital pore and in the arrangement of the testes.
Abstract: Pycnadenoides pagrosomi Yamaguti, 1938 and P. reversati n. sp. from Pagrus auratus (Sparidae) and P. invenustus n. sp. from Nemadactylus valenciennesi (Cheilodactylidae) are described from the temperate marine waters off south-west Western Australia and south-east Queensland. The difference in the anterior extent of the vitelline follicles observed in P. reversati n. sp. recovered from off south-east Queensland waters and the material from off Western Australia is discussed. P. reversati n. sp. is distinguished from P. pagrosomi mainly in the position of the genital pore and in the arrangement of the testes, and from P. invenustus n. sp. in the posterior extent of the cirrus-sac. P. reversati belongs to the group of species with a short cirrus-sac and P. invenustus to the group with the cirrus-sac reaching into the anterior hindbody.