Bermuda cave amphipod (Pseudoniphargus grandimanus)

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Pseudoniphargus grandimanus
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Bermuda cave amphipod fact file

Bermuda cave amphipod description

KingdomAnimalia
PhylumArthropoda
ClassCrustacea
OrderAmphipoda
FamilyHadziidae
GenusPseudoniphargus (1)

This is a colourless, eyeless amphipod that lacks a rostrum. The upper lip is broadly rounded and the lower lip has large inner lobes (2).

Size
Total male body length: 6.5 - 8 mm (2)
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Bermuda cave amphipod biology

The fact that large adults, but notably no specimens carrying eggs, have been found further from the sea coast than juveniles could indicate a dependence on anchialine/marine habitats for reproduction, and also that juveniles migrate inland to mature (3).

Nothing else is known of this Bermuda cave amphipod’s biology.

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Bermuda cave amphipod range

Recorded from wells, waterworks and cave waters in Hamilton, St. George’s, Devonshire, Paget, Smith’s and Warwick Parishes, Bermuda, including Church, Wonderland, Admiral’s and Government Quarry Caves (2).

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Bermuda cave amphipod habitat

Found in a wide range of anchialine limestone cave and groundwater habitats throughout the entire salinity range, although most frequently in low salinity areas. Juveniles are found far closer (11-180 m) to the sea coast than adults (147-853 m) (2).

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Bermuda cave amphipod status

Classified as Critically Endangered (CR) on the IUCN Red List 2006 (1).

IUCN Red List species status – Critically Endangered

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Bermuda cave amphipod threats

The threats to this species are unknown.

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Bermuda cave amphipod conservation

There are currently no conservation measures underway targeting this species.

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

For more information on this atyid shrimp see:

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact: arkive@wildscreen.org.uk
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Glossary

Amphipod
A species belonging to the Amphipoda order.
Anchialine
Coastal bodies of standing waters that have no surface connections to the ocean but display both tidal fluctuations and salinity ranges characteristic of fresh and brackish waters, indicating the presence of subsurface connections to the watertable and ocean.
Rostrum
Central, forward-projecting and occasionally long spine between the eyes of crustaceans.
Salinity
The concentration of dissolved salt in water.
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References

  1. IUCN Red List (January, 2007)
    http://www.iucnredlist.org
  2. Anchialine Caves and Cave Fauna of the World (February, 2007)
    http://www.tamug.edu/cavebiology/fauna/amphipods/P_grandimanus.html
  3. Stock, J.H., Holsinger, J.R., Sket, B. and Iliffe, T.M. (1986) Two new species of Pseudoniphargus (Amphipoda), in Bermudian groundwaters. Zoologica Scripta, 15(3): 237 - 249.
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Image credit

Pseudoniphargus grandimanus  
Pseudoniphargus grandimanus

© Dr. Thomas M. Iliffe

Dr. Thomas M. Iliffe
Department of Marine Biology
Texas A&M University at Galveston
5007 Ave. U
Galveston
TX
77551
United States of America
iliffe@cavebiology.com
http://www.cavebiology.com

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