Jassa falcata

Jassa falcata, commonly known as scud, is a tube-dwelling amphipod.

Jassa falcata
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Order:
Amphipoda
Family:
Ischyroceridae
Genus:
Jassa
Species:
J. falcata
Binomial name
Jassa falcata
(Montagu, 1808)
Synonyms [1]
  • Cerapus falcata Montagu
  • Jassa dentex Chevreux & Fage, 1925
  • Jassa pulchella Leach, 1814
  • Podocerus falcata

Ecology

Jassa falcata constructs tubes of debris. It is a fouling organism, growing on the bottoms of ships and slowing them down. J. falcata forms dense mats or nests. The male and the female live in different tubes. J. falcata feeds generally on hydroid growth on the bottom of rafts and ships. It is generally a suspension feeder normally found on sediment areas.[2]

Description

Amphipods have two pairs of antennae. In J. falcata the first antennae have two-segmented flagella and are shorter and more slender than the second antennae. Males are 7–13 mm long and females are 6–12 mm. Colours vary but are usually yellow-grey with brown, red or black patches depending on the colour of the habitat.[2]

Distribution

Jassa falcata is found on all British coasts. It has also been reported in several sites around the coast of Ireland.[2]

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References
  1. Mark Costello & Denise Bellan-Santini (2012). Lowry J (ed.). "Jassa falcata (Montagu, 1808)". World Amphipoda database. World Register of Marine Species. Retrieved April 14, 2012.
  2. Jacqueline Hill (2000). "Jassa falcata. An amphipod". Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme. Plymouth: Marine Biological Association of the United Kingdom. Retrieved January 29, 2012.
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