Showing papers on "Digenea published in 1977"

The Digenea in marine molluscs from Eyjafjordur, north Iceland.

Abstract: Fourteen species of marine molluscs, collected from the west coast of Eyjafjordur, North Iceland, are examined for parasitic Digenea. The distribution and where necessary the morphology of seven parasite species is described, including three new to science, namely, Metacercaria margaritae-groenlandicus I, Cercaria littorinae-saxatilis VI and Metacercaria nucellae-lapillus, The others, involving two new host records, have not previously been recorded from Iceland.

Degeneria halosauri (bell 1887) gen. et comb. n. (digenea: gorgoderidae) from the deep-sea teleost halosauropsis macrochir

Abstract: The earliest reported trematode from a deep-sea fish, Distomum halosauri Bell 1887 collected by the H.M.S. Challenger expedition, is redescribed from fresh material taken from the type host in the northwest Atlantic. The species is assigned to Degeneria gen. et comb. n. Distinguishing characteristics are the combination of a pharynx, cirrus pouch with internal seminal vesicle, dispo- sition of the uterus into the forebody, large eggs, and location in the excretory system of the host. The relationship of Degeneria to other gorgoderids is discussed. Distomum halosauri Bell 1887, from the ureters of Halosauropsis macrochir (Guinther 1868), is fully described and reclassified from fresh material taken from the type host during studies of deep-sea benthic communities in the Hudson Canyon area. The species is a gorgoderid closely resembling Dendrorchis Travassos 1929, but several unusual features require that it be placed in a new genus. Bell (1887) originally described this species as Distomum halosauri from three specimens re- moved from the ureters of H. macrochir taken

Shape, size, and surface topography of genital organs of Urogonimus macrostomus (Rudolphi, 1803) Monticelli, 1888 (Digenea), revealed by light and scanning electron microscopy

Abstract: The genital apparatus of Urogonimus macrostomus (Rudolphi, 1803) has been studied by SEM and light microscopy. The distinct muscular “seminal vesicle” and metraterm, cirrus and cirrus pouch, together with uterus and gonadal arrangement are described. The situation of the genital, excretory and Laurer's canal openings are revealed by SEM, beside the tegumental topography concerning spine and papillae distribution at the posterior end. The present results are compared with previous studies on Urogonimus Monticelli, 1888 and Leucochloridium Carus, 1835 (sensu Kagan, 1952) species.

Textrema hopkinsi gen. et sp. n. (Digenea: Cryptogonimidae) from the largemouth bass of central Texas.

Abstract: Textrema hopkinsi gen. et sp. n. is described from Micropterus salmoides from central Texas. Textrema is most similar to the genus Multigonotylus but differs in having a single gomotyl. The new genus is placed in the family Cryptogonimidae.

Life History Studies of Three Digenetic Trematodes (Digenea: Cryptogonimidae).

Abstract: Two new species of cryptogonimid trematodes belonging to genera Caecincola and Cryp to cron imus are described. A close resemblance was discovered among the developmental stages and hosts involved in the life cycles of these new species and Textrema hopkinsi. All three species employ the hydrobiid snail Cincinnatia peracuta as the first host, several members of the genus Lepomis and Elassoma zonatum as second intermediates, and Micropterus salmoides and M. punctulatus as final hosts. Life cycle and morphological similarities among the three trematodes dictate a suppres­ sion of subfamily Caecincolinae and inclusion of its members, along with genus Textrema, in subfamily Cryp togon imin ae. Life history observation revealed basically similar cercarial emergence patterns for the new species of Caecincola and T. hopkinsi. A differential metacercarial and adult development was evident for all three species, and consistently disparate population sizes were noted at False River, Pointe Coupee Parish, Louisiana. A strong correlation between the infection levels in invertebrate and vertebrate hosts was manifest. Some factors possibly contributing to these population differences are discussed.