Biology:Nanhaipotamon

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Short description: Genus of crabs

Nanhaipotamon
The freshwater crabs of Macau (10.3897-zookeys.810.30726) Figure 2, Nanhaipotamon macau.jpg
Nanhaipotamon macau
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Decapoda
Suborder: Pleocyemata
Infraorder: Brachyura
Family: Potamidae
Subfamily: Potamiscinae
Genus: Nanhaipotamon
Type species
Nanhaipotamon formosanum
(Parisi, 1916)

Nanhaipotamon is a genus of freshwater crabs, in the subfamily Potamiscinae, found in southern China and Taiwan. As of 2018, 18 species have been described.[1] The genus is named after the South China Sea (Chinese: 南海; pinyin: Nánhǎi; literally: 'South Sea'), for it occurs mostly in coastal areas. The genus was first described by R. Bott in 1968 as Isolapotamon (Nanhaipotamon), i.e., a subgenus of Isolapotamon.[2][3]

Description

These crabs are relatively large, with a carapace breadth of up to 50 mm (2.0 in). Depending on the species, the carapace may be vividly coloured, especially in males of N. hongkongense (orange to red),[4] N. aculatum (dark blue) and N. zhuhaiense (light blue).[5] Chelipeds are usually unequal, more so in larger males, where one cheliped is relatively much larger than the other. This may be of use in territorial fights, as the crabs are very aggressive towards conspecifics.[4]

Distribution and habitat

Crabs of the genus Nanhaipotamon inhabit the banks of small to medium-sized hill streams, paddy fields and swamps.[1] Although not particularly a lowland species, they usually do not occur above approximately 500 meters above sea level. Most species are nocturnal, leaving their burrows at night to forage. Species belonging to this genus have been recorded from Hong Kong,[4] Macau,[6] Guangdong, Fujian, Zhejiang, Taiwan and Dongyin Island.[7]

Conservation

Although crabs of the genus Nanhaipotamon are subject to the pet trade,[6] not much is known about the population status of most species,[8] and many are only known from their respective type locality. Of the 18 currently accepted species, only three have meaningful IUCN assessments, the rest all being data deficient.[9] Nearly a third of known species were described in the last ten years, and yet there is evidence that a lot more may be discovered in the near future.[8][10] The gambling hub of Macau is one of the most densely populated places in the world, and a new species has been described there as recently as 2018.[6] The rapid urbanization of coastal regions, habitat destruction, impacts on water quality and collection for consumption and the pet trade, pose serious threats to most known species.[9][8]

Health

Nanhaipotamon fujianense is known to be an intermediate host for the lung fluke species Paragonimus skrjabini.[11]

Species

  • Nanhaipotamon aculatum Dai, 1997[12]
  • Nanhaipotamon dongyinense Shih, Chen & Wang, 2005[7]
  • Nanhaipotamon formosanum (Parisi, 1916)[12]
  • Nanhaipotamon fujianense Lin, Cheng & Chen, 2013[11]
  • Nanhaipotamon guangdongense Dai, 1997[12][5][6]
  • Nanhaipotamon hepingense Dai, 1997[12]
  • Nanhaipotamon hongkongense (Shen, 1940)[4]
  • Nanhaipotamon huaanense Dai, 1997[12]
  • Nanhaipotamon macau Huang, Wong & Ahyong, 2018[6]
  • Nanhaipotamon nanriense Dai, 1997[12]
  • Nanhaipotamon pinghense Dai, 1997[12]
  • Nanhaipotamon pingtanense Lin, Cheng & Chen, 2012[13]
  • Nanhaipotamon pingyuanense Dai, 1997[12]
  • Nanhaipotamon wenzhouense Dai, 1997[12]
  • Nanhaipotamon wupingense Cheng, Yang, Zhong & Li, 2003[6]
  • Nanhaipotamon xiapuense Cheng, Li & Zhang, 2009[14]
  • Nanhaipotamon yongchuense Dai, 1997[12]
  • Nanhaipotamon zhuhaiense Huang, Huang & Ng, 2012[5]

Gallery

  • N. hongkongense from Hong Kong Island

    Nanhaipotamon hongkongense

  • N. hongkongense hidden in crevice

    Nanhaipotamon hongkongense

  • N. aculatum hiding in its burrow

    Nanhaipotamon aculatum

  • N. aculatum hiding in burrow

    Nanhaipotamon aculatum

  • Nanhaipotamon guangdongense from Zhuhai

    Nanhaipotamon guangdongense

References

  1. ↑ 1.0 1.1 Shih, Hsi-Te; Zhou, Xian-Min; Chen, Guo-Xiao; Chien, I-Chu; Ng, Peter K.L. (2011). "Recent vicariant and dispersal events affecting the phylogeny and biogeography of East Asian freshwater crab genus Nanhaipotamon (Decapoda: Potamidae)". Molecular Phylogenetics and Evolution 58 (3): 427–438. doi:10.1016/j.ympev.2010.11.013. PMID 21095233. 
  2. ↑ "WoRMS - World Register of Marine Species - Nanhaipotamon Bott, 1968". https://www.marinespecies.org/aphia.php?p=taxdetails&id=439729. 
  3. ↑  , Wikidata Q116930533
  4. ↑ 4.0 4.1 4.2 4.3 Dudgeon, D.; Ng, P. K. L. (1992). "The Potamidae and Parathelphusidae (Crustacea : Decapoda : Brachyura) of Hong Kong". Invertebrate Systematics 6 (3): 741–768. doi:10.1071/it9920741. ISSN 1447-2600. 
  5. ↑ 5.0 5.1 5.2 Ng, Peter K. L.; Huang, Jian Rong; Huang, Chao (2012-12-17). "A new species of Nanhaipotamon Bott, 1968 (Crustacea: Decapoda: Brachyura: Potamidae) from Zhuhai, Guangdong Province, China". Zootaxa 3588 (1): 55–63. doi:10.11646/zootaxa.3588.1.2. ISSN 1175-5334. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Huang, Chao; Wong, Kai Chin; Ahyong, Shane T. (2018-12-20). "The freshwater crabs of Macau, with the description of a new species of Nanhaipotamon Bott, 1968 and the redescription of Nanhaipotamon wupingense Cheng, Yang, Zhong & Li, 2003 (Crustacea, Decapoda, Potamidae)". ZooKeys (810): 91–111. doi:10.3897/zookeys.810.30726. ISSN 1313-2970. PMID 30613174. PMC 6308228. https://zookeys.pensoft.net/article/30726/. 
  7. ↑ 7.0 7.1 Shih, Hsi-Te; Chen, Guo-Xiao; Wang, Li-Min (2005-09-15). "A new species of freshwater crab (Decapoda: Brachyura: Potamidae) from Dongyin Island, Matsu, Taiwan, defined by morphological and molecular characters, with notes on its biogeography". Journal of Natural History 39 (31): 2901–2911. doi:10.1080/00222930500214010. ISSN 0022-2933. https://zenodo.org/record/5219964. 
  8. ↑ 8.0 8.1 8.2 Hui, Tommy Chung Hong; Leven, Michael Robertson; Stanton, David John (2018-01-26). "Distribution of Nanhaipotamon hongkongense (Shen, 1940) (Crustacea: Brachyura: Potamidae), a freshwater crab endemic to Hong Kong" (in en). Journal of Threatened Taxa 10 (1): 11156–11165. doi:10.11609/jott.3619.10.1.11156-11165. ISSN 0974-7907. 
  9. ↑ 9.0 9.1 "The IUCN Red List of Threatened Species". https://www.iucnredlist.org/en. 
  10. ↑ Huang, Chao; Mao, Si Ying (2014-02-12). "Two new potamid crabs, Yuexipotamon arcophallus new genus, new species and Minutomon shanweiense new genus, new species, (Crustacea: Decapoda: Brachyura: Potamidae) from southern China". Zootaxa 3764 (4): 455–466. doi:10.11646/zootaxa.3764.4.5. ISSN 1175-5334. PMID 24870647. 
  11. ↑ 11.0 11.1 Lin, Guo-Hua; Cheng, You-Zhu; Chen, Shao-Hong (February 2013). "[A new species of the genus Nanhaipotamon (Decapoda:Potamidae) serving as intermediate host of Paragonimus skrjabini]". Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi = Chinese Journal of Parasitology & Parasitic Diseases 31 (1): 39–42. ISSN 1000-7423. PMID 24812835. 
  12. ↑ 12.0 12.1 12.2 12.3 12.4 12.5 12.6 12.7 12.8 12.9 "A revision of freshwater crabs of the genus nanhaipotamon Bott, 1968 from China (Crustacea: Decapoda: Brachyura: Potamidae)". https://www.researchgate.net/publication/285788709. 
  13. ↑ Lin, Guo-Hua; Cheng, You-Zhu; Chen, Shao-Hong (2012-12-30). "[A new species of the genus Nanhaipotamon (Decapoda: Potamidae) from China]". Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi = Chinese Journal of Parasitology & Parasitic Diseases 30 (6): 434–437. ISSN 1000-7423. PMID 23484252. 
  14. ↑ Cheng, You-Zhu; Li, Li-Sa; Zhang, Yi (August 2009). "[A new species of the genus Nanhaipotamon (Decapoda: Potamidae) from Xiapu County, Fujian]". Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi = Chinese Journal of Parasitology & Parasitic Diseases 27 (4): 368–369. ISSN 1000-7423. PMID 20067001. 

External links

Wikidata ☰ Q18585665 entry



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