A morphological description of<i>Onchidium reevesii</i>(Gastropoda: Eupulmonata: Systellommatophora)

Wang, Dong-Feng; Xu, Guolyu; Qian, Jing; Shen, Heding; Zhang, Kunxia; Guan, J

doi:10.1080/13235818.2018.1428780

Cited by 3 publications

(6 citation statements)

References 19 publications

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“…Our knowledge of O. reevesii is based on the re-description of the holotype (Dayrat et al 2016: 32–35) as well as a recent re-description of fresh material by Wang et al (2018). The latter study begs discussion here.…”

Section: Resultsmentioning

confidence: 98%

“…Information on the color of live individuals of O. typhae and O. stuxbergi is from Dayrat et al (2016). Information on the color of live individuals of O. reevesii is from Wang et al (2018).…”

Section: Resultsmentioning

confidence: 99%

“…The foot sole of O. reevesii is said to be “whitish or light yellow” within the body of the species description (Wang et al 2018: 2). In the discussion, some individuals from Cixi City, Zhejiang Province, are also mentioned with a yellow foot (Wang et al 2018: 6). It is unclear whether those specimens from Cixi City belong to O. reevesii .…”

Section: Resultsmentioning

confidence: 99%

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A new species and new records of Onchidium slugs (Gastropoda, Euthyneura, Pulmonata, Onchidiidae) in South-East Asia

Dayrat¹,

Goulding²,

Khalil³

et al. 2019

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A new species, Onchidium melakense Dayrat & Goulding, sp. nov., is described, bringing the total to four known species in the genus Onchidium Buchannan, 1800. Onchidium melakense is a rare species with only nine individuals found at three mangrove sites in the Andaman Islands and the Strait of Malacca (western Peninsular Malaysia and eastern Sumatra). The new species is delineated based on mitochondrial (COI and 16S) and nuclear (ITS2 and 28S) DNA sequences as well as comparative anatomy. Each Onchidium species is characterized by a distinct color and can easily be identified in the field, even in the Strait of Malacca where there are three sympatric Onchidium species. An identification key is provided. In addition, Onchidium stuxbergi (Westerlund, 1883) is recorded for the first time from eastern Sumatra, and Onchidium pallidipes Tapparone-Canefri, 1889, of which the type material is described and illustrated here, is regarded as a new junior synonym of O. stuxbergi.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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A new species and new records of Onchidium slugs (Gastropoda, Euthyneura, Pulmonata, Onchidiidae) in South-East Asia

Dayrat¹,

Goulding²,

Khalil³

et al. 2019

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“…O . reevesii [ 10 ], which mainly lives in wetlands, cannot remain under water for long periods; P . reevesii , which is mainly aquatic, can remain submerged in seawater for long periods and feed on surface algae on coral reefs; and P .…”

Section: Introductionmentioning

confidence: 99%

A comprehensive comparison of four species of Onchidiidae provides insights on the morphological and molecular adaptations of invertebrates from shallow seas to wetlands

Yang

Wang

et al. 2018

PLoS ONE

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The Onchidiidae family is ideal for studying the evolution of marine invertebrate species from sea to wetland environments. However, comparative studies of Onchidiidae species are rare. A total of 40 samples were collected from four species (10 specimens per onchidiid), and their histological and molecular differences were systematically evaluated to elucidate the morphological foundations underlying the adaptations of these species. A histological analysis was performed to compare the structures of respiratory organs (gill, lung sac, dorsal skin) among onchidiids, and transcriptome sequencing of four representative onchidiids was performed to investigate the molecular mechanisms associated with their respective habitats. Twenty-six SNP markers of Onchidium reevesii revealed some DNA polymorphisms determining visible traits. Non-muscle myosin heavy chain II (NMHC II) and myosin heavy chain (MyHC), which play essential roles in amphibian developmental processes, were found to be differentially expressed in different onchidiids and tissues. The species with higher terrestrial ability and increased integrated expression of Os-MHC (NMHC II gene) and the MyHC gene, illustrating that the expression levels of these genes were associated with the evolutionary degree. This study provides a comprehensive analysis of the adaptions of a diverse and widespread group of invertebrates, the Onchidiidae. Some onchidiids can breathe well through gills and skin when under seawater, and some can breathe well through lung sacs and skin when in wetlands. A histological comparison of respiratory organs and the relative expression levels of two genes provided insights into the adaptions of onchidiids that allowed their transition from shallow seas to wetlands. This work provides a valuable reference and might encourage further study.

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“…Onchidium reevesii (Mollusca, Gastropoda, Pulmonata, Systellommatophora, Onchidiidae) is a brackish water amphibious sea slug that resides mainly in river ports of the intertidal zone and coastal tidal flats, reed and mangroves ecosystems (Wang et al, 2018; Sun et al, 2014). The species is rich in natural collagen, which has high nutritional and medicinal value; thus, it may constitute an excellent specialty aquatic product for humans if issues pertaining to their breeding in captivity can be resolved (Guan et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Identification of candidate reference genes for qRT-PCR normalization studies of salinity stress and injury inOnchidium reevesii

Yang

et al. 2019

PeerJ

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Real-time quantitative reverse transcription-PCR (qRT-PCR) is an undeniably effective tool for measuring levels of gene expression, but the accuracy and reliability of the statistical data obtained depend mainly on the basal expression of selected housekeeping genes in many samples. To date, there have been few analyses of stable housekeeping genes in Onchidium reevesii under salinity stress and injury. In this study, the gene expression stabilities of seven commonly used housekeeping genes, CYC, RPL28S, ACTB, TUBB, EF1a, Ubiq and 18S RNA, were investigated using BestKeeper, geNorm, NormFinder and RefFinfer. Although the results of the four programs varied to some extent, in general, RPL28S, TUBB, ACTB and EF1a were ranked highly. ACTB and TUBB were found to be the most stable housekeeping genes under salinity stress, and EF1a plus TUBB was the most stable combination under injury stress. When analysing target gene expression in different tissues, RPL28S or EF1a should be selected as the reference gene according to the level of target gene expression. Under extreme environmental stress (salinity) conditions, ACTB (0 ppt, 5 ppt, 15 ppt, 25 ppt) and TUBB (35 ppt) are reasonable reference gene choices when expression stability and abundance are considered. Under conditions of 15 ppt salinity and injury stress, our results showed that the best two-gene combination was TUBB plus EF1a. Therefore, we suggest that RPL28S, ACTB and TUBB are suitable reference genes for evaluating mRNA transcript levels. Based on candidate gene expression analysis, the tolerance of O. reevesii to low salinity (low osmotic pressure) is reduced compared to its tolerance to high salinity (high osmotic pressure). These findings will help researchers obtain accurate results in future quantitative gene expression analyses of O. reevesii under other stress conditions.

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A morphological description ofOnchidium reevesii(Gastropoda: Eupulmonata: Systellommatophora)

Cited by 3 publications

References 19 publications

A new species and new records of Onchidium slugs (Gastropoda, Euthyneura, Pulmonata, Onchidiidae) in South-East Asia

A new species and new records of Onchidium slugs (Gastropoda, Euthyneura, Pulmonata, Onchidiidae) in South-East Asia

A comprehensive comparison of four species of Onchidiidae provides insights on the morphological and molecular adaptations of invertebrates from shallow seas to wetlands

Identification of candidate reference genes for qRT-PCR normalization studies of salinity stress and injury inOnchidium reevesii

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