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Ranina ranina

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Dec 16, 2021

Ranina ranina, also known as the Huỳnh Đế crab,[1](red) frog crab or spanner crab,[2] is a species of crab[3] found throughout tropical and subtropicalhabitats.[4] It is often fished for its meat, and is the only known species in its genus.[5]

Species of crab

Ranina ranina
Scientific classification
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Lamarck, 1801
Species:
R. ranina
Binomial name
Ranina ranina

Synonyms
  • Cancer raninaLinnaeus, 1758
  • Ranina dentataLatreille, 1825
  • Ranina serrataLamarck, 1801
  • Ranina cristataDesjardins, 1835
  • Albunea scabraWeber, 1795 (nomen nudum)
Ranina ranina by Kawahara Keiga, 1823 – 1829. Siebold Collection.

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It may grow up to 150 millimetres (5.9 in) long, and may weigh up to 900 grams (2.0 lb).[6] The carapace is wider at the front, reddish brown in color, with ten white spots.[4]Ranina ranina is mainly nocturnal, and remains buried in the sand during the day.[2]Ranina ranina is easily distinguished from other crab species in its habitat due to its red carapace and elongated midsection.[6]

Spanner crabs inhabit coastal waters along the east coast of Australia, from Yeppoon in Queensland to the North coast of New South Wales. There is also a population to the north of Perth in Western Australia.[6]Ranina ranina is abundant in the coastal waters of south-western Mindanao, Philippines. These crabs are also found in the eastern coast of Africa, across the Indian Ocean to Indonesia, Japan and Hawaii and Vietnam.[7]

Ranina ranina inhabits depths of 10–100 metres (33–328 ft) on sandy-smooth substrata in which they bury themselves from where they attack small bottom-dwelling fish.[8] When waiting for prey, Ranina ranina will cover itself with sand, but leave its eye and mouthparts sticking out to help detect its food.[2] Offshore areas within this range in a subtropical or tropical environment serves as a habitat for Ranina ranina, but they must have ample sand for Ranina ranina to flourish, as covering themselves in sand is instrumental in their method of catching prey.

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