Brachylaima aspersae n. sp. (Digenea: Brachylaimidae) infecting farmed snails in NW Spain: Morphology, life cycle, pathology, and implications for heliciculture

Crespo, Celia; García, Nuria Diéguez; Estévez, Juan José Ibáñez; Amado, Cristina; Iglesias, R.

doi:10.1016/j.vetpar.2010.10.026

Cited by 27 publications

(38 citation statements)

References 35 publications

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“…However, the population genetics analysis of the parasite mtDNA suggests that the new species is originally indigenous to Hokkaido. Several reports [37,40,41] …”

Section: Discussionmentioning

confidence: 99%

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Brachylaima ezohelicis sp. nov. (Trematoda: Brachylaimidae) found from the land snail Ezohelix gainesi , with a note of an unidentified Brachylaima species in Hokkaido, Japan

Nakao

Waki

Sasaki

et al. 2017

Parasitology International

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Keywords:Brachylaima ezohelicis sp. nov. Ezohelix gainesiHokkaido -3 - IntroductionLand snails are terrestrial gastropod mollusks with or without shells, and the majority are hermaphroditic pulmonates. They have been highly diversified in the Japanese Archipelago, and the resulting fauna now includes approximately 800 species in spite of its small land area [Biodiversity Center of Japan (biodic.go.jp)]. Many of them are endemic species to Japan. Such a unique situation provides advantages to study evolutionary ecology in a geographic context. However, there have been few studies done concerning host-parasite ecological relationships between Japanese land snails and their internal organisms.As concerns trematode parasites, members of the families Brachylaimidae In this study, a small number of immature brachylaimids were found from intestines of Japanese toads (Bufo japonicus formosus) captured in a forest city park in Asahikawa, Hokkaido, the northernmost island of Japan. The infection seems to be accidental because the gravid adult worms were never seen in the other toad samples. The toad is an alien species from the Kanto region of Honshu island where there are no records of brachylaimid infections in amphibians [20]. A subsequent snail survey in the city park showed that land snails of Ezohelix gainesi (Bradybaenidae) are heavily infected with both sporocysts and metacercariae. A DNA sequence identification revealed that all the immature parasites detected from the toads and the snails belong to the same species. Fully matured adults were obtained through an experimental infection of immunosuppressed mice with metacercariae from E. gainesi. Based on morphological features of the adult specimens, we propose a new species of the genus Brachylaima. In this study, an additional description of Brachylaima sp., which has already been reported from the large Japanese field mouse Apodemus specious in Hokkaido [14], was also made for comparison with the new species.

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“…However, the population genetics analysis of the parasite mtDNA suggests that the new species is originally indigenous to Hokkaido. Several reports [37,40,41] …”

Section: Discussionmentioning

confidence: 99%

“…In the Russian Far East, Brachylaima apodemi has been found from the striped field mouse Apodemus agrarius [50]. Brachylaima introduced into the taxonomy of Brachylaima [37], and guarantees beneficial effects on describing new species [39,40,41]. The cercarial chaetotaxy of B. ezohelicis sp.…”

Section: Demonstrated Experimentally Thatmentioning

confidence: 99%

Brachylaima ezohelicis sp. nov. (Trematoda: Brachylaimidae) found from the land snail Ezohelix gainesi , with a note of an unidentified Brachylaima species in Hokkaido, Japan

Nakao

Waki

Sasaki

et al. 2017

Parasitology International

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“…This is particularly true of those that complete their entire life cycle in a terrestrial environment, using terrestrial snails as intermediate hosts. Most members of the family Brachylaimidae that have been studied with regard to their life cycle are known or suspected to have such host sequences (Ulmer 1951a, b;Mas-Coma and Montoliu 1986, 1987, 1995Butcher and Grove 2001;Gracenea and González-Moreno 2002;González-Moreno and Gracenea 2006;Segade et al 2011;Sirgel et al 2012;Nakao et al 2017Nakao et al , 2018Waki et al 2020). Like many members of the family Brachylaimidae, Ityogonimus lorum belongs to this latter category.…”

Section: Introductionmentioning

confidence: 99%

Ultrastructure and cytochemistry of intrauterine embryonic and larval stages of Ityogonimus lorum (Digenea: Brachylaimidae) involving transitory development of ciliated miracidia

2020

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Results of the present study provide ultrastructural evidence that miracidial morphogenesis is fully completed within the intrauterine eggs while in the most posterior uterine regions of Ityogonimus lorum, a digenean parasite of an Iberian mole, Talpa occidentalis (Eulipotyphla, Talpidae). Using transmission electron microscopy (TEM), the ultrastructural characteristics of diverse cell types and their organelles of these developing embryos and fully formed miracidia within the eggshell were examined. The eggshell and embryonic envelopes are similar to those described previously by many authors for other digeneans. However, the developing miracidia are unique among previously described digeneans in possessing transitory cilia during larvigenesis, but completely lacking cilia in fully formed miracidium larvae. The evidence for completion of miracidial maturation in intrauterine eggs is based on the presence of the following structures: (1) transitional stage of ciliated differentiating miracidial epithelium; (2) apical and lateral glands, characteristic for digenean miracidia; and (3) fully developed germinative cells grouped together in the germinative sac localized in the posterior region of the miracidium. The protonephridial system with its characteristic flame cells and the nervous system with diverse types of neurons and nerve centers, which are characteristic for other digenean species reported until now, are absent from all these developmental stages of I. lorum. Based on these observations, we hypothesize that the life cycle of I. lorum is entirely terrestrial, involving passive transmission by ingestion of eggs containing unciliated miracidia to the first intermediate host.

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“…Identification of the parasites was based on previously published descriptions (Yamaguti, 1975;Butcher and Grove, 2001;Barger and Hnida, 2008;Segade et al, 2011;Valente et al, 2016).…”

mentioning

confidence: 99%

“…Some researchers have previously reported the presence of metacercariae of Brachylaima spp. in the kidney, pericardial sac, body cavity near the female genital pore, and pedal glands of land snails (Mas-Coma and Montoliu, 1986;Thiengo and Amato, 1995;Butcher and Grove, 2001;Barger and Hnida, 2008;Barger, 2011;Segade et al, 2011;Valente et al, 2016;Nakao et al, 2017). The occurrence of Brachylaima sp.…”

mentioning

confidence: 99%

Natural infection of the land snails Xerolenta obvia, Zebrina detrita, andMonacha samsunensis by Brachylaima sp. metacercariae in Kastamonu, Turkey

Ismail¹,

Gürellı²

2018

Turk J Zool

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Brachylaima aspersae n. sp. (Digenea: Brachylaimidae) infecting farmed snails in NW Spain: Morphology, life cycle, pathology, and implications for heliciculture

Cited by 27 publications

References 35 publications

Brachylaima ezohelicis sp. nov. (Trematoda: Brachylaimidae) found from the land snail Ezohelix gainesi , with a note of an unidentified Brachylaima species in Hokkaido, Japan

Brachylaima ezohelicis sp. nov. (Trematoda: Brachylaimidae) found from the land snail Ezohelix gainesi , with a note of an unidentified Brachylaima species in Hokkaido, Japan

Ultrastructure and cytochemistry of intrauterine embryonic and larval stages of Ityogonimus lorum (Digenea: Brachylaimidae) involving transitory development of ciliated miracidia

Natural infection of the land snails Xerolenta obvia, Zebrina detrita, andMonacha samsunensis by Brachylaima sp. metacercariae in Kastamonu, Turkey

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