Morphological constraint obscures richness: a mitochondrial exploration of cryptic richness in Transversotrema (Trematoda: Transversotrematidae)

Cutmore, Scott C.; Corner, Richard D.; Cribb, Thomas H.

doi:10.1016/j.ijpara.2023.06.006

Cited by 4 publications

(12 citation statements)

References 73 publications

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“…acutum at 56-65 base positions (12.5-14.5%) in the cox1 dataset, a difference consistent with the recognition of closely related but distinct species for a range of trematode families in the IWP (e.g. Cutmore et al, 2021Cutmore et al, , 2023Huston et al, 2021;Bray et al, 2023;Magro et al, 2023). Further, for Sch.…”

Section: Trematode Identification Over Geographical Rangesupporting

confidence: 72%

Molecular species delimitation of marine trematodes over wide geographical ranges: Schikhobalotrema spp. (Digenea: Haplosplanchnidae) in needlefishes (Belonidae) from the Pacific Ocean and Gulf of Mexico

Pérez-Ponce de León,

Solórzano-García,

Huston

et al. 2023

Parasitology

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Geographical distribution plays a major role in our understanding of marine biodiversity. Some marine fish trematodes have been shown to have highly restricted geographical distributions, while some are known to occur over very wide ranges; however, very few of these wide distributions have been demonstrated genetically. Here, we analyse species of the genus Schikhobalotrema (Haplosplanchnidae) parasitizing beloniforms from the tropical west Pacific, the eastern Pacific and the Gulf of Mexico (GoM). We test the boundaries of these trematodes by integrating molecular and morphological data, host association, habitat of the hosts and geographical distribution, following a recently proposed and standardized delineation method for the recognition of marine trematode species. Based on the new collections, Schikhobalotrema huffmani is here synonymized with the type-species of the genus, Schikhobalotrema acutum; Sch. acutum is now considered to be widely distributed, from the GoM to the western Pacific. Additionally, we describe a new species, Schikhobalotrema minutum n. sp., from Strongylura notata and Strongylura marina (Belonidae) from La Carbonera coastal lagoon, northern Yucatán, GoM. We briefly discuss the role of host association and historical biogeography of the hosts as drivers of species diversification of Schikhobalotrema infecting beloniforms.

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Section: Trematode Identification Over Geographical Rangesupporting

confidence: 72%

Molecular species delimitation of marine trematodes over wide geographical ranges: Schikhobalotrema spp. (Digenea: Haplosplanchnidae) in needlefishes (Belonidae) from the Pacific Ocean and Gulf of Mexico

Pérez-Ponce de León,

Solórzano-García,

Huston

et al. 2023

Parasitology

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“…The fish were produced in the Danish household aquarium indicating that the infection had occurred locally. We based the tentative diagnosis of the digenean on its morphological appearance, as it shared characteristics of the genus Transversotrema [ 12 – 14 , 22 ]. The life cycle is expected to include a mollusk (snail) as intermediate host [ 22 – 27 ], and the aquarist was asked to bring snails from the home aquarium facility to the diagnostic laboratory for a parasitological examination (shedding procedure of cercariae) [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

“…The latter served as an outgroup. Species cox1 ITS2 28 S a Number of sequences from [ 14 ] 236 sequences 41 sequences 89 sequences b Number of species from [ 14 ] 35 species 35 species 35 species Transversotrema hafniensis n. sp. OR432511 OR436781 OR436781 Transversotrema patialense OP066719 OP08873 OP099865 Prototransversotrema steeri NA GU174458 AY222184 Azygia longa KM538080 KT808319 KC985234 NA indicates not available.…”

Section: Methodsmentioning

confidence: 99%

“…They are ectoparasites and occupy scale pockets in a wide range of fish species [ 13 ]. This particular microhabitat may be the reason that the morphology of even remotely related different species has exhibited a limited change during evolution although species differentiation based on morphometric characters is possible [ 14 ]. The family is predominantly marine and a range of species have been reported from the Indo-Pacific region.…”

Section: Introductionmentioning

confidence: 99%

“…The family is predominantly marine and a range of species have been reported from the Indo-Pacific region. Many, but not all, of the species can be differentiated based on their morphological characters, and the advent of molecular diagnostic techniques has been shown to improve species differentiation [ 14 ]. The transversotrematid parasite isolated from the Danish aquarium is a freshwater form with a resemblance to the species T. patialense , which has been reported from tropical and ornamental fish throughout the World for almost a century.…”

Section: Introductionmentioning

confidence: 99%

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Transversotrema hafniensis n. sp. infection in Poecilia reticulata by cercariae released from Melanoides tuberculata in Denmark

Buchmann,

Kania

2024

Acta Vet Scand

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Background Exotic and ornamental fish are highly popular companion animals resulting in a significant transcontinental trade of fish, invertebrates and aquatic plants. A major issue is the diseases associated with these organisms, as they have a major impact on health of the fish in both public and private household aquaria. A secondary issue is the trade with these products, which potentially may expand the distribution area and spread a range of diseases to new habitats. Results We here describe how Poecilia reticulata (guppy), produced in a private household aquarium, were invaded by cercariae of an exotic trematode released by imported Melanoides tuberculata snails. The fish presented with severe clinical signs (tremor, flashing, scraping of body against objects). A standard parasitological examination and morphometric identification showed scale pocket infections with a digenean trematode species within the genus Transversotrema. Molecular identification by PCR, sequencing and phylogenetic analyses of a 2646 bp sequence encoding ribosomal RNA (partial 18 S, ITS1, 5.8 S, ITS2, partial 28 S) was performed. The 1107 bp sequence of mitochondrial DNA (cox1) showed that the parasite differed from previously described Transversotrema species in M. tuberculata. Morphometrics of adult and larval specimens of this isolate also differed from previously described freshwater species within the genus. The new species was described and is named after Copenhagen, for its geographic origin. Conclusions The genus Transversotrema comprises a range of species, adapted to a microhabitat in scalepockets of teleosts. A combination of morphological and molecular characterization techniques has been shown to provide a good differentiation between species. The fish were not purchased from a pet shop but produced in the home aquarium. This indicated that an infection pressure existed in the aquarium, where the source of infection was found to be exotic intermediate host snails M. tuberculata, which originally were imported and purchased from a pet shop. The potential spread of fish diseases associated with trade of fish and snails to new geographic regions, where climate conditions are favourable, is discussed.

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Lepocreadiidae (Trematoda) associated with gelatinous zooplankton (Cnidaria and Ctenophora) and fishes in Australian and Japanese waters

Cribb,

Cutmore,

Wee

et al. 2024

Parasitology International

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Morphological constraint obscures richness: a mitochondrial exploration of cryptic richness in Transversotrema (Trematoda: Transversotrematidae)

Cited by 4 publications

References 73 publications

Molecular species delimitation of marine trematodes over wide geographical ranges: Schikhobalotrema spp. (Digenea: Haplosplanchnidae) in needlefishes (Belonidae) from the Pacific Ocean and Gulf of Mexico

Molecular species delimitation of marine trematodes over wide geographical ranges: Schikhobalotrema spp. (Digenea: Haplosplanchnidae) in needlefishes (Belonidae) from the Pacific Ocean and Gulf of Mexico

Transversotrema hafniensis n. sp. infection in Poecilia reticulata by cercariae released from Melanoides tuberculata in Denmark

Lepocreadiidae (Trematoda) associated with gelatinous zooplankton (Cnidaria and Ctenophora) and fishes in Australian and Japanese waters

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