scholarly journals Spermiogenesis and ultrastructure of the spermatozoon of the trypanorhynch cestode Aporhynchus menezesi (Aporhynchidae), a parasite of the velvet belly lanternshark Etmopterus spinax (Elasmobranchii: Etmopteridae)

2011 ◽  
Vol 58 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Adji Mama Marigo ◽  
Zdzislaw Swiderski ◽  
Cheikh Tidiane Ba ◽  
Jordi Miquel
Keyword(s):  
Trypanorhynch Cestode

Revision of the Family Gilquiniidae Dollfus (Cestoda, Trypanorhyncha) From Elasmobranch Fishes

1989 ◽  
Vol 37 (5) ◽  
pp. 481 ◽  
Author(s):  
I Beveridge
Keyword(s):  
New Genera ◽  
The Family ◽  
Trypanorhynch Cestode ◽  
Elasmobranch Fishes

The trypanorhynch cestode family Gilquiniidae Dollfus, 1942 is revised. The existing genera Gilquinia Guiart, 1927 and Aporhynchus Nybelin, 1918 are redescribed, and two new genera, Plesiorhynchus, gen. nov., and Deanicola, gen. nov., are added. Gilquinia squali (Fabricius, 1794) is redescribed, and G. robertsoni, sp. nov., and G. stevensi, sp. nov., are added. G. nannocephala (Pintner, 1930) is unrecognisable from the description and the only extant types are in a macerated condition, preventing redescription. Plesiorhynchus etmopteri, sp. nov., and P. campbelli, sp. nov., differ from related genera in having an elongate pars post-bulbosa. Deanicola protentus, sp. nov., and D. minor, sp. nov., differ from related genera in having a prominently craspedote scolex. Aporhynchus norvegicus (Olsson, 1868) is redescribed, and A. tasmaniensis, sp nov., added.

Ultrastructural and cytochemical studies on vitellogenesis in trypanorhynch cestode Dollfusiella spinulifera Beveridge, Neifar et Euzet, 2004 (Eutetrarhynchidae)

2006 ◽  
Vol 51 (3) ◽  
Author(s):  
Zdzisław Świderski ◽  
Jordi Miquel ◽  
Daniel Młocicki ◽  
Lassad Neifar ◽  
Barbara Grytner-Zięcina ◽  
...  
Keyword(s):  
Plasma Membranes ◽  
Periodic Acid ◽  
Unsaturated Lipids ◽  
Egg Formation ◽  
Large Vesicle ◽  
Cell Plasma ◽  
Shell Globule ◽  
Trypanorhynch Cestode ◽  
Flocculent Material ◽  
Glycogen Particles

AbstractThe first description of vitellogenesis in the Trypanorhyncha is presented in this paper. Though the type of vitellogenesis and mature vitellocyte in Dollfusiella spinulifera appear to be unique among the Eucestoda, to some extent they resemble that observed in the lower cestodes, namely the Tetraphyllidea and Pseudophyllidea. Maturation is characterized by: (1) an increase in cell volume; (2) extensive development of large, parallel, frequently concentric cisternae of GER that produce proteinaceous granules; (3) development of Golgi complexes engaged in packaging this material; (4) continuous enlargement of proteinaceous granules within vesicles and their transformation into shell globule clusters; and (5) progressive fusion of all vesicles, with flocculent material containing the proteinaceous granules and shell globule clusters, into a single very large vesicle that characterises mature vitellocytes of this tapeworm. Cell inclusions in and around the large vesicle consist of flocculent material of a very low density, a few shell globule clusters, moderately dense proteinaceous granules and numerous large droplets of unsaturated lipids. A new previously unreported mode of transformation of proteinaceous granules into shell globule clusters, that evidently differs from that of pseudophyllideans and tetraphyllideans, is described. Cytochemical staining with periodic acid-thiosemicarbazide-silver proteinate for polysaccharides indicates a strongly positive reaction for membrane-bound glycoproteins in all membranous structures such as GER, mitochondria, Golgi complexes, nuclear and cell plasma membranes. Similar staining revealed β-glycogen particles scattered in the cytoplasm of maturing vitellocytes. Typical cytoplasmic β-glycogen particles appear mainly during early vitellocyte maturation but it is characteristic for this species that they are only seldom visible in mature cells. Some working hypotheses concerning the interrelationship between this particular pattern of vitellogensis, possible mode of egg formation in D. spinulifera, its embryonic development and trypanorhynchean life cycle, are drawn and discussed.

No evidence for seasonality in the ectoparasitic fauna of slimy mackerel, Scomber australasicus

1993 ◽  
Vol 44 (5) ◽  
pp. 709 ◽  
Author(s):  
KML Perera
Keyword(s):  
Seasonal Variation ◽  
New South ◽  
New South Wales ◽  
Fish Length ◽  
South Wales ◽  
Trypanorhynch Cestode

Fifteen (or sixteen) species of ectoparasites-6 monogeneans, 4 (or 5) trematodes, 2 copepods, 1 isopod, 1 cestode, and unidentified cysts -were collected from 428 Scomber australasicus individuals caught at Eden, New South Wales, Australia, between November 1988 and June 1992. Neither common nor rare parasites of slimy mackerel showed seasonal variation in abundance or prevalence. Only the copepod Brachiella magna occurred more frequently on larger (older) fish than smaller (younger fish). Two monogeneans (Kuhnia scombri, Pseudokuhnia minor), 2 didymozoids, and unidentified cysts occurred more frequently on smaller than larger fish. The intensities of the remaining monogeneans (Kuhnia scombercolias, Kuhnia sprostonae and Grubea australis), 1 didymozoid, 1 copepod (Peniculus sp.), the isopod (Ceratothoa imbricata) and a trypanorhynch cestode were not significantly correlated with fish length.

The trypanorhynch cestode fauna of Borneo

Zootaxa ◽  
2014 ◽  
Vol 3900 (1) ◽  
pp. 21 ◽  
Author(s):  
BJOERN C. SCHAEFFNER ◽  
IAN BEVERIDGE
Keyword(s):  
Trypanorhynch Cestode

Relationship between some environmental parameters and trypanorhynch cestode loads in banana prawns (Penaeus merguiensis de Man)

1981 ◽  
Vol 32 (3) ◽  
pp. 469 ◽  
Author(s):  
L Owens
Keyword(s):  
Littoral Zone ◽  
Carapace Length ◽  
Feeding Habits ◽  
High Tide ◽  
Environmental Parameters ◽  
Appreciable Effect ◽  
Differential Survival ◽  
Size Frequency Distribution ◽  
Trypanorhynch Cestode ◽  
Penaeus Merguiensis

The population of P. merguiensis in the Norman River was sampled at weekly intervals for 6 months during the 1978-79 summer. The size-frequency distribution of one recruitment cohort to that river was progressively studied. and individual prawns examined for parasites as they grew from post-larvae to adolescence. The juvenile banana prawns were essentially unparasitized by pierocerci of Parachristianella monomegacantha Kruse until they reached 13 mm carapace length. Thereafter. the larger adolescent prawns accumulated trypanorhynch parasites in proportion to their increases in size. This was attributed to a change in feeding habits at 13 mm carapace length. Previous studies had shown that, at least on spring tides, juvenile banana prawns fed in the lower littoral zone at low tide. and adolescent prawns were more conspicuous at high tide when waters entered the mangrove areas. These studies, coupled with the above data, suggested that the main infective area for the prawns was mangroves in the upper littoral zone. When marine salinities increased from 32 to 37‰ prevalence of Paiachristianella monomegacantha also rose. Estuarine salinities of 12-32‰, had no appreciable effect on parasitism, with the level being low and constant throughout this range. This result was possibly due to differential survival of infective stages in the estuary. As a corollary to this. the percentage of infected Penaeus merguiensis dropped from a maximum of 84% at the mouth to 26% at Normanton, 80 km upstream. When considering the use of parasites as biological tags for the estuarine phase of catadromous penaeid prawns, the size of the prawns and salinity where they are captured have substantial effects on parasite loads.

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