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Higher level relationships of leeches (Annelida: Clitellata: Euhirudinea) based on morphology and gene sequences.
TLDR
Results suggest that the nuclear 18S rDNA gene yields a meaningful historical signal for determining higher level relationships, andBiogeographic patterns supported a New World origin for Arhynchobdellida, and analyses combining all data from the three character sets yielded one most-parsimonious tree.
A review of recent information on the Haplosporidia, with special reference to Haplosporidium nelsoni (MSX disease)
TLDR
Model simulations support hypotheses that recent H. nelsoni outbreaks in the NE United States are related to increased winter temperatures, and that a host other than oysters is involved in the life cycle, and also support monophyly of the Haplosporidia.
Prevalence and distribution of QPX, Quahog Parasite Unknown, in hard clams Mercenaria mercenaria in Virginia, USA.
TLDR
The presence of the pathogen QPX in 3 of the state's most productive hard clam growout areas warrants continued monitoring and research.
Herpes virus in juvenile Pacific oysters Crassostrea gigas from Tomales Bay, California, coincides with summer mortality episodes.
TLDR
Hemocytosis, diapedesis and hemocyte degeneration characterized by nuclear pycnosis and fragmentation were observed in infected oysters, which is consistent with previous observations of OsHV infections in France.
Epizootiology of Perkinsus marinus disease of oysters in Chesapeake Bay, with emphasis on data since 1985
TLDR
Long-term oyster disease monitoring along a salinity gradient in the James River revealed a statistically significant relationship between salinity and P. marinus prevalence and intensity, which is clearly correlated with salinity increases resulting from drought conditions in the late 1980s.
'Total evidence' refutes the inclusion of Perkinsus species in the phylum Apicomplexa.
TLDR
The phylogenetic affinities of the oyster pathogen Perkinsus marinus were investigated with morphology, 18S-like rDNA data and actin sequence data and the resulting cladogram strongly corroborates the placement of Perkinsus species with the Dinoflagellida and not with the Apicomplexa.
Increased Virulence in an Introduced Pathogen: Haplosporidium nelsoni (MSX) in the Eastern Oyster Crassostrea virginica.
TLDR
Results document greatly increased virulence in a naive host-parasite association and reinforce potential dangers of intentional, but improper, introductions of exotic marine organisms for aquaculture or resource restoration.
Bonamia perspora n. sp. (Haplosporidia), a Parasite of the Oyster Ostreola equestris, is the First Bonamia Species Known to Produce Spores
TLDR
Histopathology, electron microscopy, and molecular phylogenetic analysis support the designation of a new parasite species, Bonamia perspora n.
Systematic evaluation of factors controlling Perkinsus marinus transmission dynamics in lower Chesapeake Bay.
TLDR
The results indicate that transmission can occur when host mortality is low or absent, so alternative mortality-independent dissemination mechanisms are likely, and suggest that atypically early-summer oyster mortality from Haplosporidium nelsoni infection, at a time when infections of P. marinus are light, has a significant indirect influence on P.Marinus transmission dynamics.
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