Histophagous ciliate Pseudocollinia brintoni and bacterial assemblage interaction with krill Nyctiphanes simplex. II. Host responses

Gómez‐Gutiérrez, Jaime; Ángel-Rodríguez, Jorge Del; Tremblay, Nelly; Zenteno‐Savín, Tania; Aguilar-Méndez, Mario J.; López‐Cortés, Alejandro; Robinson, Carlos J.

doi:10.3354/dao02923

Cited by 9 publications

(1 citation statement)

References 44 publications

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“…grapsolytica tropho‐tomont externally recruits from a phoront, either with a slow accumulation over time, or as part of a packet of infective phoronts as hypothesized for some pseudocolliniids (Gómez‐Gutiérrez et al. 2015). A more likely explanation, given the consistently high numbers of tropho‐tomonts observed in infected crabs, is that tropho‐tomonts recruit internally.…”

Section: Discussionmentioning

confidence: 99%

Lynniagrapsolytica n. gen, n. sp. (Ciliophora: Apostomatida: Colliniidae), a Deadly Blood Parasite of Crabs with a Novel Pseudocytopharynx

Metz

Hechinger

2021

J Eukaryotic Microbiology

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We describe a new genus and species of blood-dwelling apostome ciliate, Lynnia grapsolytica n. gen., n. sp. (Apostomatida: Colliniidae). A distinct kinety "hook" pattern on the tomite's posterior ventral face, coupled with its marine habitat and use of a decapod host, readily distinguishes this ciliate from all known colliniids. We detected the parasite in~12% of Pachygrapsus crassipes (Brachyura: Grapsidae) crabs in a California estuary and confirmed its presence at a Baja California rocky intertidal site. As existing methods failed to adequately stain this ciliate, we developed a new miniaturized silver carbonate impregnation staining method that produced excellent somatic and nuclear stains in all five observed cell types. A possibly unique trait is the active invagination of the tropho-tomont's anterior to form a temporary "pseudocytopharynx," likely used for feeding. Histological examination revealed that the ciliate invaded and damaged skeletal muscle, the heart, connective tissues, and gonads. Survivorship analysis indicated that infected crabs experienced 2.6 times greater daily mortality than uninfected crabs. Laboratory and field experimental infection attempts failed, suggesting a complex life cycle with outsidehost development. Phylogenetic analysis at the 18S and COI loci confirmed the ciliate's placement in the Colliniidae. We emend the diagnosis of Family Colliniidae.

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Section: Discussionmentioning

confidence: 99%