Slipper lobster

Slipper lobsters are a family (Scyllaridae) of about 90 species of achelate crustaceans, in the Decapoda Reptantia, found in all warm oceans and seas. They are not true lobsters, but are more closely related to spiny lobsters and furry lobsters. Slipper lobsters are instantly recognisable by their enlarged antennae, which project forward from the head as wide plates. All the species of slipper lobsters are edible, and some, such as the Moreton Bay bug and the Balmain bug (Ibacus peronii) are of commercial importance.

Slipper lobsters
Temporal range: 100–0 Ma
Scyllarides latus
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Order:
Decapoda
Suborder:
Pleocyemata
Infraorder:
Achelata
Family:
Scyllaridae

Latreille, 1825 [1]
Subfamilies [2]
  • Arctidinae
  • Ibacinae
  • Scyllarinae
  • Theninae

Description

Slipper lobsters have six segments in their heads and eight segments in the thorax, which are collectively covered in a thick carapace. The six segments of the abdomen each bear a pair of pleopods, while the thoracic appendages are either walking legs or maxillipeds. The head segments bear various mouthparts and two pairs of antennae. The first antennae, or antennules, are held on a long flexible stalk, and are used for sensing the environment. The second antennae are the slipper lobsters' most conspicuous feature, as they are expanded and flattened into large plates that extend horizontally forward from the animal's head.[3]

There is considerable variation in size among species of slipper lobsters. The Mediterranean species Scyllarus pygmaeus is the smallest, growing to a maximum total length of 55 millimetres (2.2 in), and rarely more than 40 mm (1.6 in).[4] The largest species, Scyllarides haanii, may reach 50 centimetres (20 in) long.[5]

Ecology

Slipper lobsters are typically bottom dwellers of the continental shelves, found at depths of up to 500 metres (1,600 ft).[6] Slipper lobsters eat a variety of molluscs, including limpets, mussels and oysters,[7] as well as crustaceans, polychaetes and echinoderms.[8] They grow slowly and live to a considerable age. They lack the giant neurones which allow other decapod crustaceans to perform tailflips, and must rely on other means to escape predator attack, such as burial in a substrate and reliance on the heavily armoured exoskeleton.[9]

The most significant predators of slipper lobsters are bony fish, with the grey triggerfish being the most significant predator of Scyllarides latus in the Mediterranean Sea.[7]

Life cycle

After hatching out of their eggs, young slipper lobsters pass through around ten instars as phyllosoma larvae — leaf-like, planktonic zoeae.[10] These ten or so stages last the greater part of a year, after which the larva moults into a "nisto" stage that lasts a few weeks. Almost nothing is known about the transition from this stage to the adults, which continue to grow through a series of moults.[3]

Commercial importance
Global production of slipper lobsters from 1957 to 2007

Although they are fished for wherever they are found, slipper lobsters have not been the subject of such intense fishery as spiny lobsters or true lobsters.[11] The methods used for catching slipper lobsters varies depending on the species' ecology. Those that prefer soft substrates, such as Thenus and Ibacus, are often caught by trawling, while those that prefer crevices, caves and reefs (including Scyllarides, Arctides and Parribacus species) are usually caught by scuba divers.[6]

The global catch of slipper lobsters was reported in 1991 to be 2,100 tonnes (2,100 long tons; 2,300 short tons).[12] More recently, annual production has been around 5,000 tonnes (4,900 long tons; 5,500 short tons), the majority of which is production of Thenus orientalis in Asia.[13]

Common names

A number of common names have been applied to the family Scyllaridae. The most common of these is "slipper lobster",[2][6] followed by "shovel-nosed lobster"[14] and "locust lobster". "Spanish lobster" is used for members of the genus Arctides,[15] "mitten lobster" for Parribacus,[16] and "fan lobster" for Evibacus[17] and Ibacus.[18] In Australia, a number of species are called "bugs" (for example, the Balmain bug and Moreton Bay bug), especially those in the genus Ibacus.[19] Other names used in Australia include "bay lobster", "blind lobster", "flapjack", "flat lobster", "flying saucer", "gulf lobster", "mudbug", "sandbug", "shovel-nose bug", "shovelnose lobster", "crayfish", "slipper bug" and "squagga".[20] Rarer terms include "flathead lobster" (for Thenus orientalis)[21] and "bulldozer lobster".[22] In Greece they may be known as Kolochtypes which roughly translates as 'bum hitter'. Twenty-two genera are recognised,[23] the majority of which were erected in 2002 by Lipke Holthuis for species formerly classified under Scyllarus:[24]

Parribacus japonicus
Scyllarus arctus


Fossil record

The fossil record of slipper lobsters extends back 100–120 million years, which is considerably less than that of slipper lobsters' closest relatives, the spiny lobsters. One significant earlier fossil is Cancrinos claviger, which was described from Upper Jurassic sediments at least 142 million years ago, and may represent either an ancestor of modern slipper lobsters,[25] or the sister group to the family Scyllaridae sensu stricto.[22]

gollark: Maybe. It *would* be useful to run random number generators in my head, and such.
gollark: Unfortunately, I can't do bitops fast enough.
gollark: But anyway, solar, if you want a fancy thought keyboard thing, and it's reading your surface thoughts or whatever *constantly*, that's problematic.
gollark: And MRI thingies can detect... which area of your brain is working, or something.
gollark: There are things which *apparently* roughly detect your level of focus on a task, at least.

References
  1. "Scyllaridae Latreille, 1825". Integrated Taxonomic Information System. Retrieved October 21, 2011.
  2. Gary Poore & Michael Türkay (February 24, 2009). "Scyllaridae". World Register of Marine Species. Retrieved January 21, 2010.
  3. Kari L. Lavalli & Ehud Spanier (2007). "Introduction to the biology and fisheries of slipper lobsters". In Kari L. Lavalli & Ehud Spanier (eds.). The Biology and Fisheries of the Slipper Lobster. Crustacean Issues. 17. CRC Press. pp. 3–24. ISBN 978-0-8493-3398-9.
  4. Lipke B. Holthuis (1991). "Scyllarus pygmaeus". Marine Lobsters of the World. FAO Fisheries Synopsis No. 125. Food and Agriculture Organization. pp. 224–225. ISBN 92-5-103027-8.
  5. Lipke B. Holthuis (1991). "Scyllarides haanii". Marine Lobsters of the World. FAO Fisheries Synopsis No. 125. Food and Agriculture Organization. p. 189. ISBN 92-5-103027-8.
  6. "Family SCYLLARIDAE Latreille, 1825". Australian Faunal Directory. Department of the Environment, Water, Heritage and the Arts. January 8, 2010.
  7. E. Spanier & K. L. Lavalli (1998). "Natural history of Scyllarides latus (Crustacea: Decapoda): a review of the contemporary biological knowledge of the Mediterranean slipper lobster". Journal of Natural History. 32 (10 & 11): 1769–1786. doi:10.1080/00222939800771281.
  8. D. Miner; G. Allinson; S. Salzman; M. Nishikawa & N. Turoczy (2006). "Trace metal concentrations in the Balmain bug (Ibacus peronii Leach, 1815) from southwest Victoria, Australia". Bulletin of Environmental Contamination and Toxicology. 76 (6): 1007–1013. doi:10.1007/s00128-006-1018-7. PMID 16855908.
  9. Sandra Y. Espinoza; Lana Breen; Nisha Varghese & Zen Faulkes (2006). "Loss of escape-related giant neurons in a spiny lobster, Panulirus argus". Biological Bulletin. 211 (3): 223–231. doi:10.2307/4134545. JSTOR 4134545.
  10. Nariaki Inoue & Hideo Sekiguchi (2005). "Distribution of scyllarid phyllosoma larvae (Crustacea: Decapoda: Scyllaridae) in the Kuroshio Subgyre". Journal of Oceanography. 61 (3): 389–398. doi:10.1007/s10872-005-0049-8.
  11. Ehud Spanier & Kari L. Lavalli (2007). "Directions for future research in slipper lobster biology". In Kari L. Lavalli & Ehud Spanier (eds.). The Biology and Fisheries of the Slipper Lobster. Crustacean Issues. 17. CRC Press. pp. 221–228. ISBN 978-0-8493-3398-9.
  12. Lipke B. Holthuis (1991). Marine Lobsters of the World. FAO Fisheries Synopsis No. 125. Food and Agriculture Organization. ISBN 92-5-103027-8.
  13. "Global Production". Fishery Statistics programme. Food and Agriculture Organization. Retrieved January 21, 2010.
  14. Karen Gowlett-Holmes. "Taxon Report: Scyllaridae". Commonwealth Scientific and Industrial Research Organisation. Retrieved January 21, 2010.
  15. "Arctides Holthuis, 1960". Integrated Taxonomic Information System. Retrieved October 21, 2011.
  16. "Parribacus Dana, 1852". Integrated Taxonomic Information System. Retrieved October 21, 2011.
  17. "Evibacus Smith, 1869". Integrated Taxonomic Information System. Retrieved October 21, 2011.
  18. "Ibacus Leach, 1815". Integrated Taxonomic Information System. Retrieved October 21, 2011.
  19. "Bugs (Ibacus spp.)" (PDF). New South Wales Department of Primary Industries. Retrieved January 21, 2010.
  20. "Fish names: Balmain bug". Seafood Services Australia. Retrieved January 21, 2010.
  21. "Thenus orientalis (Lund, 1793)". Integrated Taxonomic Information System. Retrieved October 21, 2011.
  22. Joachim T. Haug; Carolin Haug; Dieter Waloszek; Andreas Maas; Matthias Wulf & Günter Schweigert (2009). "Development in Mesozoic scyllarids and implications for the evolution of Achelata (Reptantia, Decapoda, Crustacea)" (PDF). Palaeodiversity. 2: 97–110.
  23. Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109.
  24. Lipke Holthuis (2002). "The Indo-Pacific scyllarine lobsters (Crustacea, Decapoda, Scyllaridae)" (PDF). Zoosystema. 24 (3): 499–683.
  25. W. Richard Webber & John D. Booth (2007). "Taxonomy and evolution". In Kari L. Lavalli & Ehud Spanier (eds.). The Biology and Fisheries of the Slipper Lobster. Crustacean Issues. 17. CRC Press. pp. 25–52. ISBN 978-0-8493-3398-9.

Further reading
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