Panulirus homarus

Panulirus homarus is a species of spiny lobster that lives along the coasts of the Indian and Pacific Oceans. It lives in shallow water, and feeds on the brown mussel Perna perna. It typically grows to a length of 20–25 cm (7.9–9.8 in). Alongside the dark green nominate subspecies, two red subspecies are recognised, one around the Arabian Peninsula, and one around southern Africa. It is the subject of small-scale fishery.

Panulirus homarus

Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Order:
Decapoda
Family:
Palinuridae
Genus:
Panulirus
Species:
P. homarus
Binomial name
Panulirus homarus
Subspecies [2]
  • P. h. homarus (Linnaeus, 1758)
  • P. h. megasculpta (Pesta, 1915)
  • P. h. rubellus Berry, 1974
Synonyms[3]
  • Cancer homarus Linnaeus, 1758
  • Astacus homarus (Linnaeus, 1758)
  • Palinurus homarus (Linnaeus, 1758)
  • Palinurus dasypus H. Milne-Edwards, 1837
  • Palinurus spinosus H. Milne-Edwards, 1837
  • Palinurus burgeri De Haan, 1841
  • Palinurus (Senex) buergeri (De Haan, 1841)
  • Senex dasypus (H. Milne-Edwards, 1837)
  • Panulirus dasypus (H. Milne-Edwards, 1837)
  • Panulirus buergeri (De Haan, 1841)

Distribution

Panulirus homarus is found in the Indo-West Pacific region, from East Africa along the coast of the Indian Ocean, as far as the Malay Archipelago, and then along the coasts of the Pacific Ocean to Japan in the north and Australia, New Caledonia and probably the Marquesas Islands in the south.[3]

P. homarus lives in shallow water, usually 1–5 metres (3 ft 3 in–16 ft 5 in) deep, including among rocks in the surf zone, but occasionally up to 90 m (300 ft), and in turbid water.[3]

Description

The body of P. homarus can reach up to 31 centimetres (12 in) in total length, or a carapace length of 12 cm (4.7 in), but the average is around 20–25 cm (8–10 in).[3]

There is variation in the colouration, which parallels other morphological differences; most animals are dark green and have only very small squamae in the grooves of the abdominal tergites. Other animals are red, and have much more prominent sculpturation in the grooves on the abdominal tergites.[4] The green form is known as the microsculpta form, and the red form as the megasculpta form.[4]

Subspecies

Three subspecies of P. homarus are recognised, with the marked difference between the microsculpta form and the megasculpta form of the animal being used to separate them.[4] Linnaeus' original description of the species was based on microsculpta material, so the nominate subspecies, P. h. homarus, is used for that subspecies. It is found throughout the species range.[4] The megasculpta form occurs in two distinct geographical areas, each of which is considered a separate subspecies: P. h. megasculpta in southern Arabia and Socotra, and P. h. rubellus off the coasts of Madagascar and Southern Africa.[4]

Ecology

P. homarus is nocturnal and gregarious.[3] It feeds mostly on the brown mussel Perna perna.[5] In South Africa, it is one of the main prey items for the Cape clawless otter.[6]

Fishery

In South Africa, P. homarus was only the subject of small-scale fisheries until 1969, when a company was formed to exploit it.[3] It is also the most important species of spiny lobster to the lobster fisheries of Tamil Nadu and Kerala (India), although in East Africa, it is one of the less common species; the annual catch off Somalia is around 120 t.[3] It is also caught in the Philippines, Taiwan and Thailand.[3] Vietnam has lobster aquaculture based on the grow-out of wild caught juveniles.[7] In Australia, hatchery technology is poised for commercialization.[8]

Taxonomic history

Panulirus homarus was named Cancer homarus in Carl Linnaeus' Systema Naturae in 1758, the starting point for zoological nomenclature. The original description was simply "[Cancer] macrourus, thorace antrorsum aculeato, manibus adactylis", with a type locality of Mari Asiatico.[9] The lectotype is the animal portrayed in a watercolour published in 1705 in Georg Eberhard Rumphius' Amboinsche Rariteitkamer.[3] The original specimen, which was in the collection of Henricus d'Acquet, the burgomaster of Delft has been lost, but the illustration survives, and is held in the Tropenmuseum in Amsterdam.[3] Despite the vague location given by Linnaeus, the legend to the illustration makes it clear that the specimen was from Ambon, Indonesia.[3]

Henri Milne-Edwards' species Palinurus spinosus is probably a subjective synonym of P. homarus. His description could apply to any of P. homarus, P. interruptus and P. regius, but the colours he described most closely resemble those of P. homarus.[3]

gollark: They convert signalling chemical values into... different signalling chemical values.
gollark: They are, if I remember right, basically programmable cells which can do different things depending on neurocyte input.
gollark: Anyway, soon I will unlock stemocytes, hopefully, which are very fun.
gollark: Well, it did look cool.
gollark: It also created giant "tails" of near-dead photocytes.

References
  1. M. Butler; A. Cockcroft & A. MacDiarmid (2011). "Panulirus homarus". IUCN Red List of Threatened Species. 2011: e.T170062A6703197. doi:10.2305/IUCN.UK.2011-1.RLTS.T170062A6703197.en.
  2. T. Chan (2010). "Panulirus homarus (Linnaeus, 1758)". World Register of Marine Species. Retrieved June 1, 2010.
  3. Lipke B. Holthuis (1991). "Panulirus homarus". FAO Species Catalogue, Volume 13. Marine Lobsters of the World. FAO Fisheries Synopsis No. 125. Food and Agriculture Organization. pp. 139–141. ISBN 92-5-103027-8.
  4. P. F. Berry (1974). "A revision of the Panulirus homarus-group of spiny lobsters (Decapoda, Palinuridae)". Crustaceana. 27 (1): 31–42. doi:10.1163/156854074x00208. JSTOR 20102111.
  5. L. M. Joll (1982). "Foregut evacuation of four foods by the western rock lobster, Panulirus cygnus, in aquaria" (PDF). Australian Journal of Marine and Freshwater Research. 33: 939–943. doi:10.1071/mf9820939.
  6. Hans Kruuk (2006). "African otter diets". Otters: ecology, behaviour, and conservation. Oxford University Press. pp. 117–119. ISBN 978-0-19-856586-4.
  7. "Panulirus homarus". Cultured Aquatic Species Information Programme. Food and Agriculture Organization. Retrieved 29 September 2017.
  8. Amelinckx, Andrew (28 September 2017). "Rock Lobster From a Farm Could Soon Be Coming To a Menu Near You". Smithsonian. Retrieved 29 September 2017.
  9. Carl Linnaeus (1758). "239. Cancer". Systema Naturae. 1 (10th ed.). Stockholm, Sweden: Laurentii Salvii. pp. 625–634.
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