Retroporomonorchis pansho n. g., n. sp., an unusual monorchiid trematode exploiting an atypical host

Systematic Parasitology - The Monorchiidae Odhner, 1911 are well represented in tropical and subtropical marine fishes worldwide but rarely reported from the Lutjanidae, an important family of...     

Two amphistomes,Lobatodiscus australiensis n.g., n.sp. and Elseyatrema microacetabularis n.g., n.sp., from the Australian turtle Elseya dentata (Gray)

Summary Lobatodiscus australiensis n.g., n.sp. (family and subfamily uncertain) and Elseyatrema microacetabularis n.g., n.sp. (family Paramphistomidae, subfamily Dadaytrematinae?), from the intestine of the freshwater turtle Elseya dentata (Gray) in Queensland, Australia, are described. Lobatodiscus has a large lobed acetabulum, small oral diverticula which do not protrude out of the oral sucker, two pairs of lymph vessels and no oesophageal bulb. Elseyatrema has a small acetabulum, large protruding oral diverticula, an oesophageal bulb, juxtaposed testes, one pair of rudimentary lymph vessels and no cirrus-sac. ac]19830626     

Tunicothrix rostrata n. g., n. sp., a new urostylid ciliate (Ciliophora, Stichotrichia) from the Yellow Sea

The morphology and infraciliature of a new ciliate, Tunicothrix rostrata n. g., n. sp., isolated from the Yellow Sea, are investigated using live observation and protargol impregnation. Tunicothrix rostrata measures about 160 x 40 mum in vivo, and has a frontal beak-like protrusion, a conspicuous cortical alveolar layer, two right marginal rows, and usually three distinct midventral pairs. The discovery of T. rostrata enables us to reconsider the classification of Erniella wilberti, a curious ciliate with obscure midventral pairs. Both species are highly similar in overall appearance and nuclear and ciliary pattern. Thus, they are united in a new genus of the family Urostylidae, Tunicothrix, and E. wilberti is transferred to Tunicothrix: Tunicothrix wilbertiLin and Song, 2004 n. comb. By contrast, Erniella filiformis, type species of Erniella, has several ventral rows and does not belong to the urostylids. Tunicothrix rostrata is easily distinguished from T. wilberti by its beak-like anterior protrusion and by the distinctly elongated right marginal row 2, which curves anteriorly on the dorsal side of the cells. Tunicothrix is closely related to Parabirojimia, differing by the invariably two (vs. five-eight) right marginal rows and the conspicuous (vs. ordinary) alveolar layer, a unique feature in urostylid ciliates.     

Pseudohurleytrema yolandae n. sp., the first monorchiid trematode reported from the Triacanthidae (Tetraodontiformes)

Systematic Parasitology - Prior to the present study, species of the trematode family Monorchiidae Odhner, 1911 had been reported from four of the ten families of tetraodontiform fishes: the...     

Pseudoloma neurophilia n. g., n. sp., a new microsporidium from the central nervous system of the zebrafish (Danio rerio)

An unusual xenoma-forming microsporidium was discovered in the central nervous system of moribund zebrafish from a laboratory colony in Eugene, Oregon. Infected fish were often emaciated and lethargic, and histological examination commonly revealed severe myelitis and myositis associated with the infection. Based on its structure, development, and small subunit ribosomal DNA sequence it is unique among fish microsporidia. Spores are uninucleate, ovoid to pyriform, with a prominent posterior vacuole. Spores average 5.4 x 2.7 microm with 13-16 coils of the polar filament. The microsporidium produces xenomas within the spinal cord and hindbrain of fish, and xenomas contained sporophorous vesicles with up to 16 spores. Sporoblasts and presporoblast stages (probably sporonts) are found occasionally in small aggregates dispersed randomly throughout xenomas. It clustered in the "Ichthyosporidium group" along with other fish microsporidian genera based on rDNA sequence analysis. The rDNA sequence of the zebrafish microsporidium was most similar to that of Ichthyosporidium, but showed only 12.1% similarity and therefore this microsporidium can be considered a distinct genus and species, which we have named Pseudoloma neurophilia n. g., n. sp.     

Pleurotrochopsis anebodica n.g., n.sp. (Rotatoria) aus Schweden

Ohne Zusammenfassung     

A new heterolobosean amoeba Solumitrus palustris n. g., n. sp. isolated from freshwater marsh soil

During the course of research on the bacterial feeding behavior and resistance of amoebae to virulent pathogens, we isolated a new strain of amoeba from organic rich soil at the margin of freshwater swamp in the northeastern United States. Light microscopic morphology is characteristically heterolobosean, resembling vahlkampfiids, including a broadened, limax shape, and eruptive locomotion, but occasionally becoming more contracted and less elongated with lateral or anterior bulges and somewhat branching sparse, uroidal filaments. Electron microscopic evidence, including mitochondria with flattened cristae surrounded by rough endoplasmic reticulum, further indicates a heterolobosean affinity. The solitary nucleus contains a centrally located nucleolus. Cysts are rounded with occasionally an eccentrically located nucleus. The cyst walls are relatively thin, becoming crenated, and loosely enclosing the cyst when mature. Molecular genetic evidence places this isolate among the Heterolobosea, branching most closely in a clade including Allovahlkampfia spelaea and previously isolated, un-named strains of soil amoebae. Based on differentiated features, including morphology of the uroid, cyst wall structure, and molecular genetic evidence that distinguish it from A. spelaea, a new genus and species, Solumitrus palustris, is proposed for this new heterolobosean.     

Lernaeopoda tenuis n. sp. andPseudolernaeopoda caudocapta n. g., n. sp. (Copepoda,Lernaeopodidae) parasitic onTriakis maculata (Kner & Steindachner) from the Chilean coast,South Pacific

Summary One new genus and two new species of the Lernaeopodidae (Copepoda: Siphonostomatoida), parasitic onTriakis maculata off the coast of Chile, are described and illustrated. The new genus,Pseudolernaeopoda, parasitizes the cloaca of its host. Its type-species,P. caudocapta, can be distinguished fromLernaeopoda by the absence of modified uropods. A new species ofLernaeopoda, L. tenuis, was found on the gills of the same host. In absence of the male, the generic affinities of this species must be considered only tentative. ac]19850409     

Mataza hastifera n. g., n. sp.: a possible new lineage in the Thecofilosea (Cercozoa)

A new cercozoan flagellate Mataza hastifera n. g., n. sp. is described from a surface seawater sample collected in Tokyo Bay. Cells are 3-5 μm in diameter and have two flagella. The cells alternate between swimming and stationary states in culture. Swimming cells have a nodding motion. Phylogenetic analyses using small subunit rDNA sequences demonstrate that M. hastifera belongs to the clade comprised of only environmental sequences closely related to thecofilosean cercozoans. Ultrastructural observations reveal that M. hastifera is quite similar to members of Cryomonadida, an order in Thecofilosea, and especially to Cryothecomonas spp. The cell of M. hastifera is covered with a thin double-layered theca and possesses a cylinder-shaped extrusome, as reported from cryomonads. On the other hand, the funnel that is characteristic of cryomonads was not found in the flagellar pit of M. hastifera. Combining both morphological and molecular analyses, we conclude that M. hastifera is a new lineage in Thecofilosea and suggest that Thecofilosea may be a larger group than previously thought.