Life History of Plagioporus sinitsini Mueller and Embryology of New Cotylocercous Cercariae (Trematoda)

Dobrovolny, Charles G.

doi:10.2307/3222930

Cited by 35 publications

(9 citation statements)

References 8 publications

(13 reference statements)

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“…Similarly, the muscular tail complex and body of B. gracilescens allow limited movement within the sporocyst. In species where the cercariae are immotile and tail-less, the sporocyst itself may migrate to the exterior, as described by Dobrovolny (1939) in Plagioporus sinitsini. Kagan (1952) describes the division of the sporocyst of Neoleucochloridium problematicum into functionally distinct portions, mature cercariae collecting within conspicuous brood pouches in the tentacles of the snail host.…”

Section: Discussionmentioning

confidence: 99%

Cercaria vaullegeardi Pelseneer, 1906 (Digenea: Hemiuridae); the daughter sporocyst and emergence of the cercaria

Matthews

1980

Parasitology

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SUMMARYThe daughter sporocyst of Cercaria vaullegeardi has hitherto been regarded as occurring within the haemocoel of the digestive gland of Gibbula umbilicalis. A re-examination has shown that an important part of the sporocyst, previously overlooked, extends from the digestive gland, through the afferent renal vein, the right kidney haemocoel and the transverse pallial vessel into the blood channel within a gill filament, thus providing a means of exit from the host directly into the mantle cavity. The sporocyst is described at light and electron microscope levels, and the emergence of the cystophorous cercariae is discussed.

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Section: Discussionmentioning

confidence: 99%

Cercaria vaullegeardi Pelseneer, 1906 (Digenea: Hemiuridae); the daughter sporocyst and emergence of the cercaria

Matthews

1980

Parasitology

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“…(2) a variable feature of plagiorchiiforms; present in opecoelids (Dobrovolny, 1939) and in the plagiorchiids Sigmapera Nicoll, 1918 and Dolichoperoides Johnston & Angel, 1940 (from Pearson, unpubl. ); but absent, or at least not recorded, from an allocreadiid (Hussey, 1941), paragonimid (Hussey, 1941), troglotrematid (Kuntz, 1952), the plagiorchiid Macroderoides (Pearse, 1924) (from Hussey, 1941), a dicrocoeliid (Kuntz, 1952) and an eucotylid (Kuntz, 1952);…”

Section: Cercarialmentioning

confidence: 99%

On the position of the digenean family Heronimidae: an inquiry into a cladistic classification of the Digenea

Pearson

1992

Syst Parasitol

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Brooks, O'Grady & Glen (1985b) placed the seemingly aberrant and highly derived family Heronimidae at the base of their cladogram of the Digenea. In the absence of arguments for the composition and polarity of the putative homologous series on which their cladogram is based, it was found necessary to consider in detail almost all of their character series. In the course of my analysis I (1) argue that the oral sucker is singular to the Digenea, and that the oral sucker is not synapomorphic nor the ventral sucker symplesiomorphic for the Digenea, but that early digeneans lacked both suckers, (2) reiterate that the amphistomate condition is secondary and has arisen more than once, and that the embryology of the excretory system proves it to be secondary in all cases, (3) offer support for Cable's view that the cercarial stylet is not of single origin, and (4) restate the argument that paramphistomes, microscaphidiids, and gyliauchenids have not an oral sucker but a pharynx. Brooks, Bandoni, Macdonald & O'Grady (1989) stated that the bifurcate gut is unambiguously a synapomorph of the Digenea, on the basis of their cladistic demonstration that Rugogaster with a bifurcate gut is a sister group to the rest of the Aspidobothria, which in turn is a sister group to the Digenea. Testing this in a new cladogram of the Aspidobothria constructed from Brooks et al. 's (1989) 15 characters (corrected, especially those of the ventral sucker, for which a new phylogeny is advanced), supplemented by an additional 23 characters, reveals Rugogaster as the derived form it appeared to be and aspidogastrids, with a single caecum, as sister group to the rest of the Aspidobothria.A new analysis of the characters produced an increase in homoplasy from 18% to 37%, showed 97 out of 212 characters invalid as used, these two resulting in a decrease in resolution from 82% to 32%, and resulted in changes in polarity in 20 of the 65 putative homologous series listed by Brooks et al. (1985b).The Heronimidae cannot be at the base of their cladogram as it has not three but 13 apomorphs, which is more than have the next three groups, the paramphistomiforms, echinostomatiforms and haploporiforms.Comparison of the Heronimidae with the Bivesiculidae in the light of 48 defensible plesiomorphs shows that the Bivesiculidae, which have 39 of the 48 characters, are more plesiomorphic than the Heronimidae, which have only 23.In conclusion, what remains of the data-base is insufficient to support their cladogram and classification. Better data from the flukes themselves are necessary for a sound cladistic analysis. 82 J.C. Pearson

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“…Loss or suppression of free-swimming cercarial stages, as opposed to premature encystment in the sporocyst, as reported for the cercaria of Sphaerostoma bramae, is known in various marine cercariae and was described by Dobrovolny (1939) for the cercariae of Plagioporus sinitsini in fresh water. In this cercaria there are also indications of degenerative changes occurring, ' The absence of a stylet and the poorly developed penetration glands indicate that the cercariae of P. sinitsini do not have the equipment for penetrating another host'.…”

Section: Further Developmentmentioning

confidence: 79%

Some stylet cercariae and a microphallid type in British freshwater molluscs

Pike¹

1967

Parasitology

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Cercaria helvetica XXXIII Dubois and the cercaria of Sphaerostoma bramae (Müll.) are redescribed and their metacercariae, which occur in various invertebrates, are described. Additional observations are made on C. parvus Khan and C. tarda Khan and their metacercariae, occurring mainly in arthropods, are described. C. wentloogensis sp.nov. has four pairs of penetration glands, a slender, thickened stylet 0·03 mm long and the flame-cell formula2[(2 + 2 + 2) + (2 + 2 + 2)].C. rumniensis sp.nov. has four pairs of penetration glands lying dorsally to the acetabulum, a slender thickened stylet 0·03 mm long and at least 20 flame cells arranged in pairs. C. octoglandulata sp.nov. is a virgulate species with four pairs of penetration glands, a partially thickened stylet 0·029–0·032 mm long and the flame-cell formula 2[(3 + 3 + 3) + (3 + 3 + 3)]. Each of these new species develops in sporocysts in the digestive gland of the prosobranch mollusc Bithynia tentaculata. A cercaria occurring in the digestive gland of B. tentaculata and assigned to the Microphallidae on the structure of its metacercaria is considered to encyst in the digestive gland without emerging. It bears no stylet or penetration glands and the cysts occur in the snail in exceedingly large numbers.All of these cercariae were found in freshwater molluscs collected at the Wentloog level near Cardiff, South Wales.

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Life History of Plagioporus sinitsini Mueller and Embryology of New Cotylocercous Cercariae (Trematoda)

Cited by 35 publications

References 8 publications

Cercaria vaullegeardi Pelseneer, 1906 (Digenea: Hemiuridae); the daughter sporocyst and emergence of the cercaria

Cercaria vaullegeardi Pelseneer, 1906 (Digenea: Hemiuridae); the daughter sporocyst and emergence of the cercaria

On the position of the digenean family Heronimidae: an inquiry into a cladistic classification of the Digenea

Some stylet cercariae and a microphallid type in British freshwater molluscs

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