Euastacus spinifer

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Euastacus spinifer
Euastacus spinifer.jpg
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Decapoda
Family: Parastacidae
Genus: Euastacus
Species: E. spinifer
Binomial name
Euastacus spinifer
(Heller, 1865)
Euastacus spinifer distribution.svg
Range of Euastacus spinifer (orange) in Australia

Euastacus spinifer is a species of freshwater crayfish endemic to Australia that belongs to the family Parastacidae.

Appearance[edit]

Morphological variation is observed in Euastacus spinifer that originate in different river systems. They are mostly green with reddish-brown joints and bright spines.[2]

Diet[edit]

Detritus forms the staple diet of the species but they may also eat small invertebrates and tadpoles.[2] They are also cannibalistic. They are also believed to be opportunistic omnivore.[3]

Life cycle[edit]

Mating takes place in winter when temperature drops to as low as 15 °C (59 °F), and eggs are laid in early July. Eggs are carried in the female Pleopods and hatch after an incubation period of 110–140 days. Hatch-lings stay with their parents until early summer. Males mature in 5–6 years and grow to 11 centimetres (4 in) on maturity while females take about 8 years and from above 14 centimetres (6 in). There are a class of "precious males" that mature at 4 centimetres (2 in) length. There are slight variation in reproduction cycle between species in different river systems.[4]

Size[edit]

Euastacus spinifer may grow up to 24 centimetres (9 in).[2] Largest recorded weight is 1.8 kilograms (4.0 lb).[5]

Distribution[edit]

They are endemic to Australia. They may be found from near sea level to as high as 1,200 metres (3,900 ft). They are distributed over a range of 55,000 square kilometres (21,000 sq mi).[1]

Habitat[edit]

Creeks and estuaries are their usual habitats. Their habitats are usually shaded by vegetation.[6]

Moulting[edit]

Moulting frequency of individuals in the species differ with size smaller individuals moult up to six times a year while larger individuals moult only once. Different sizes moult a different seasons temperature is believed to be the regulating force.[7]

References[edit]

  1. ^ a b J. Coughran & J. Furse (2010). "Euastacus spinifer". The IUCN Red List of Threatened Species. IUCN. 2010: e.T153707A4534826. doi:10.2305/IUCN.UK.2010-3.RLTS.T153707A4534826.en. Retrieved 14 January 2018. 
  2. ^ a b c https://m.ala.org.au/repo/1000/25/253561/raw.html
  3. ^ Diet and feeding in the freshwater crayfish, Euastacus spinifer (Decapoda: Parastacidae), from the Sydney region, AustraliaBy: Turvey, P ;Merrick, J R
  4. ^ Reproductive biology of the freshwater crayfish, Euastacus spinifer (Decapoda: Parastacidae), from the Sydney region, Australia By Turvey Merrick, J R
  5. ^ Growth with age in the freshwater crayfish, Euastacus spinifer (Decapoda: Parastacidae), from the Sydney region, Australia By: Turvey, P ;Merrick, J R
  6. ^ Keith A. Crandall. "Euastacus spinifer Heller 1865". Tree of Life Web Project. Retrieved 8 July 2013. 
  7. ^ Moult increments and frequency in the freshwater crayfish, Euastacus spinifer (Decapoda: Parastacidae), from the Sydney region, Australia By: Turvey, P ;Merrick, J R

External links[edit]