A synopsis of Macrobrachium Spence Bate, 1868 (Decapoda: Caridea: Palaemonidae) from Hong Kong, with description of a new species

Lai Him CHOW; Jeffery C F CHAN; Ling Ming TSANG

doi:10.1093/jcbiol/ruac039

A synopsis of Macrobrachium Spence Bate, 1868 (Decapoda: Caridea: Palaemonidae) from Hong Kong, with description of a new species

Lai Him CHOW, Jeffery C F CHAN, Ling Ming TSANG^*

^*Corresponding author for this work

Science Unit

Research output: Journal Publications › Journal Article (refereed) › peer-review

2 Citations (Scopus)

Abstract

Only four freshwater shrimp species from the genus Macrobrachium Spence Bate, 1868 are known previously from Hong Kong, namely M. formosense Spence Bate, 1868, M. hainanense (Parisi, 1919), M. meridionale Liang & Yan, 1983, and M. nipponense (De Haan, 1849). This is likely an underestimate as a result of insufficient sampling, given that recent efforts revealed several new records in their counterpart family Atyidae, and the presence of many more Macrobrachium species from the region (i.e., Guangdong Province, China). We report the occurrence of three more species in Hong Kong: M. equidens (Dana, 1852), M. lar (Fabricius, 1798), M. venustum (Parisi, 1919), and a new species being described, M. lantausp. nov. The new species is erected from the highly variable M. equidens species complex, distinctive in live colouration and genetics. Decisive morphological differences from M. equidens sensu lato could not be confidently elucidated until the species complex is fully resolved. Molecular analysis shows that ‘M. hainanense’ reported from Hong Kong actually refers to M. laevis Zheng, Chen & Guo, 2019. Morphological (and molecular) evidence suggest that M. inflatum Liang & Yan, 1985 and M. superbum (Heller, 1862) are possibly morphotypes and thus synonyms of M. nipponense. Macrobrachium hainanense and M. heterorhynchos Guo & He, 2008 are also likely synonyms of M. formosense and M. equidens, respectively. These species are, nevertheless, maintained as valid until examination of the type specimens concurs. The importance of an integrative approach and the associated matters needing attention in systematic studies of Macrobrachium are discussed.

Original language	English
Article number	ruac039
Journal	Journal of Crustacean Biology
Volume	42
Issue number	3
Early online date	5 Aug 2022
DOIs	https://doi.org/10.1093/jcbiol/ruac039
Publication status	Published - Sept 2022

Bibliographical note

Funding Information:
We thank Kwok Chu Cheung, Wai Wah Wong, Ka Yan Ma, Nicola Wong, Chandler Tsang, and Zi Yi Kho (The Chinese University of Hong Kong), and Samuel Ho for their technical support and assistance in specimen collection. We also thank Tommy Hui, Chung Yi Tse, and Hung Tsun Cheng for providing information on species distribution. Special thanks to Peter K.L. Ng (Lee Kong Chian Natural History Museum, National University of Singapore) for providing essential literatures, and Jose Christopher E. Mendoza and Muhammad Dzaki Bin Safaruan (Lee Kong Chian Natural History Museum, National University of Singapore) for arranging loans of museum specimens. This work was supported by the General Research Fund (Project number CUHK14112920) from the Research Grants Council, University Grants Committee, Hong Kong SAR, China, and by the Lantau Conservation Fund (Grant number: LCF-RE-2021-02) from the Sustainable Lantau Office, Civil Engineering and Development Department, Hong Kong SAR Government, China.

Publisher Copyright:
© 2022 The Author(s).

Keywords

Crustacea
biodiversity
freshwater shrimps
intra-specific variations
southern China
systematics
taxonomy

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1093/jcbiol/ruac039

Cite this

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title = "A synopsis of Macrobrachium Spence Bate, 1868 (Decapoda: Caridea: Palaemonidae) from Hong Kong, with description of a new species",

abstract = "Only four freshwater shrimp species from the genus Macrobrachium Spence Bate, 1868 are known previously from Hong Kong, namely M. formosense Spence Bate, 1868, M. hainanense (Parisi, 1919), M. meridionale Liang & Yan, 1983, and M. nipponense (De Haan, 1849). This is likely an underestimate as a result of insufficient sampling, given that recent efforts revealed several new records in their counterpart family Atyidae, and the presence of many more Macrobrachium species from the region (i.e., Guangdong Province, China). We report the occurrence of three more species in Hong Kong: M. equidens (Dana, 1852), M. lar (Fabricius, 1798), M. venustum (Parisi, 1919), and a new species being described, M. lantausp. nov. The new species is erected from the highly variable M. equidens species complex, distinctive in live colouration and genetics. Decisive morphological differences from M. equidens sensu lato could not be confidently elucidated until the species complex is fully resolved. Molecular analysis shows that {\textquoteleft}M. hainanense{\textquoteright} reported from Hong Kong actually refers to M. laevis Zheng, Chen & Guo, 2019. Morphological (and molecular) evidence suggest that M. inflatum Liang & Yan, 1985 and M. superbum (Heller, 1862) are possibly morphotypes and thus synonyms of M. nipponense. Macrobrachium hainanense and M. heterorhynchos Guo & He, 2008 are also likely synonyms of M. formosense and M. equidens, respectively. These species are, nevertheless, maintained as valid until examination of the type specimens concurs. The importance of an integrative approach and the associated matters needing attention in systematic studies of Macrobrachium are discussed.",

keywords = "Crustacea, biodiversity, freshwater shrimps, intra-specific variations, southern China, systematics, taxonomy",

author = "CHOW, {Lai Him} and CHAN, {Jeffery C F} and TSANG, {Ling Ming}",

note = "Funding Information: We thank Kwok Chu Cheung, Wai Wah Wong, Ka Yan Ma, Nicola Wong, Chandler Tsang, and Zi Yi Kho (The Chinese University of Hong Kong), and Samuel Ho for their technical support and assistance in specimen collection. We also thank Tommy Hui, Chung Yi Tse, and Hung Tsun Cheng for providing information on species distribution. Special thanks to Peter K.L. Ng (Lee Kong Chian Natural History Museum, National University of Singapore) for providing essential literatures, and Jose Christopher E. Mendoza and Muhammad Dzaki Bin Safaruan (Lee Kong Chian Natural History Museum, National University of Singapore) for arranging loans of museum specimens. This work was supported by the General Research Fund (Project number CUHK14112920) from the Research Grants Council, University Grants Committee, Hong Kong SAR, China, and by the Lantau Conservation Fund (Grant number: LCF-RE-2021-02) from the Sustainable Lantau Office, Civil Engineering and Development Department, Hong Kong SAR Government, China. Publisher Copyright: {\textcopyright} 2022 The Author(s).",

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journal = "Journal of Crustacean Biology",

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T1 - A synopsis of Macrobrachium Spence Bate, 1868 (Decapoda: Caridea: Palaemonidae) from Hong Kong, with description of a new species

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AU - TSANG, Ling Ming

N1 - Funding Information: We thank Kwok Chu Cheung, Wai Wah Wong, Ka Yan Ma, Nicola Wong, Chandler Tsang, and Zi Yi Kho (The Chinese University of Hong Kong), and Samuel Ho for their technical support and assistance in specimen collection. We also thank Tommy Hui, Chung Yi Tse, and Hung Tsun Cheng for providing information on species distribution. Special thanks to Peter K.L. Ng (Lee Kong Chian Natural History Museum, National University of Singapore) for providing essential literatures, and Jose Christopher E. Mendoza and Muhammad Dzaki Bin Safaruan (Lee Kong Chian Natural History Museum, National University of Singapore) for arranging loans of museum specimens. This work was supported by the General Research Fund (Project number CUHK14112920) from the Research Grants Council, University Grants Committee, Hong Kong SAR, China, and by the Lantau Conservation Fund (Grant number: LCF-RE-2021-02) from the Sustainable Lantau Office, Civil Engineering and Development Department, Hong Kong SAR Government, China. Publisher Copyright: © 2022 The Author(s).

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N2 - Only four freshwater shrimp species from the genus Macrobrachium Spence Bate, 1868 are known previously from Hong Kong, namely M. formosense Spence Bate, 1868, M. hainanense (Parisi, 1919), M. meridionale Liang & Yan, 1983, and M. nipponense (De Haan, 1849). This is likely an underestimate as a result of insufficient sampling, given that recent efforts revealed several new records in their counterpart family Atyidae, and the presence of many more Macrobrachium species from the region (i.e., Guangdong Province, China). We report the occurrence of three more species in Hong Kong: M. equidens (Dana, 1852), M. lar (Fabricius, 1798), M. venustum (Parisi, 1919), and a new species being described, M. lantausp. nov. The new species is erected from the highly variable M. equidens species complex, distinctive in live colouration and genetics. Decisive morphological differences from M. equidens sensu lato could not be confidently elucidated until the species complex is fully resolved. Molecular analysis shows that ‘M. hainanense’ reported from Hong Kong actually refers to M. laevis Zheng, Chen & Guo, 2019. Morphological (and molecular) evidence suggest that M. inflatum Liang & Yan, 1985 and M. superbum (Heller, 1862) are possibly morphotypes and thus synonyms of M. nipponense. Macrobrachium hainanense and M. heterorhynchos Guo & He, 2008 are also likely synonyms of M. formosense and M. equidens, respectively. These species are, nevertheless, maintained as valid until examination of the type specimens concurs. The importance of an integrative approach and the associated matters needing attention in systematic studies of Macrobrachium are discussed.

AB - Only four freshwater shrimp species from the genus Macrobrachium Spence Bate, 1868 are known previously from Hong Kong, namely M. formosense Spence Bate, 1868, M. hainanense (Parisi, 1919), M. meridionale Liang & Yan, 1983, and M. nipponense (De Haan, 1849). This is likely an underestimate as a result of insufficient sampling, given that recent efforts revealed several new records in their counterpart family Atyidae, and the presence of many more Macrobrachium species from the region (i.e., Guangdong Province, China). We report the occurrence of three more species in Hong Kong: M. equidens (Dana, 1852), M. lar (Fabricius, 1798), M. venustum (Parisi, 1919), and a new species being described, M. lantausp. nov. The new species is erected from the highly variable M. equidens species complex, distinctive in live colouration and genetics. Decisive morphological differences from M. equidens sensu lato could not be confidently elucidated until the species complex is fully resolved. Molecular analysis shows that ‘M. hainanense’ reported from Hong Kong actually refers to M. laevis Zheng, Chen & Guo, 2019. Morphological (and molecular) evidence suggest that M. inflatum Liang & Yan, 1985 and M. superbum (Heller, 1862) are possibly morphotypes and thus synonyms of M. nipponense. Macrobrachium hainanense and M. heterorhynchos Guo & He, 2008 are also likely synonyms of M. formosense and M. equidens, respectively. These species are, nevertheless, maintained as valid until examination of the type specimens concurs. The importance of an integrative approach and the associated matters needing attention in systematic studies of Macrobrachium are discussed.

KW - Crustacea

KW - biodiversity

KW - freshwater shrimps

KW - intra-specific variations

KW - southern China

KW - systematics

KW - taxonomy

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DO - 10.1093/jcbiol/ruac039

M3 - Journal Article (refereed)

SN - 0278-0372

VL - 42

JO - Journal of Crustacean Biology

JF - Journal of Crustacean Biology

IS - 3

M1 - ruac039

ER -

A synopsis of Macrobrachium Spence Bate, 1868 (Decapoda: Caridea: Palaemonidae) from Hong Kong, with description of a new species

Abstract

Bibliographical note

Keywords

UN SDGs

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