Jasus frontalis

Jasus frontalis, known as the Juan Fernández rock lobster, is a species of spiny lobster in the genus Jasus, found around the Juan Fernández and Desventuradas Islands in the south-eastern Pacific Ocean.

Jasus frontalis
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Order:
Decapoda
Family:
Palinuridae
Genus:
Jasus
Species:
J. frontalis
Binomial name
Jasus frontalis
Synonyms[2]
  • Palinostus frontalis Spence Bate, 1888
  • Palinurus frontalis H. Milne-Edwards, 1837

Description and life cycle

Male adults of Jasus frontalis reach a maximum length of 48 centimetres (19 in) (carapace length 22 cm or 8.7 in), with females slightly smaller at 46 cm (18 in) long (carapace length 19 cm or 7.5 in).[2] Females reach sexual maturity after around seven years, when they have reached a carapace length of 75–77 mm (3.0–3.0 in).[3] Jasus frontalis differs from the other two species in its species group – Jasus tristani and Jasus paulensis – by the lack of sculpturation on the first abdominal somite.[2]

Distribution and fishery

Jasus frontalis lives in the seas around the Juan Fernández Islands and the Desventuradas Islands, off the coast of Chile, at depths of 2–200 metres (7–656 ft), where the water is at a temperature of 13–19 °C (55–66 °F).[2] The species was found to be plentiful and easily caught by early explorers who visited the area, such as Jacob Roggeveen (in 1722) and George Anson (in 1741).[2] Today, J. frontalis is commercially fished throughout its range. The IUCN Red List states that while the catch has reportedly diminished and fishing efforts have increased, there is little quantifiable data on the catch per unit effort for estimating the conservation status and outlook for the species.[1]

References
  1. R. Wahle; A. MacDiarmid; M. Butler & A. Cockcroft (2011). "Jasus frontalis". IUCN Red List of Threatened Species. 2011: e.T169948A6690436. doi:10.2305/IUCN.UK.2011-1.RLTS.T169948A6690436.en. Retrieved 14 January 2018.
  2. Lipke B. Holthuis (1991). "Jasus (Jasus) edwardsii". Marine Lobsters of the World (PDF). FAO Species Catalogue, Volume 13. FAO Fisheries Synopsis No. 125. Food and Agriculture Organization. pp. 98–99. ISBN 92-5-103027-8.
  3. Andrew G. Jeffs; Caleb Gardner & Andy Cockroft (2013). "Jasus and Sagmariasus species". In Bruce Phillips (ed.). Lobsters: Biology, Management, Aquaculture & Fisheries (2nd ed.). John Wiley & Sons. doi:10.1002/9781118517444.ch9. ISBN 9781118517499.
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