Abergasilus

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Abergasilus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Maxillopoda
Subclass: Copepoda
Order: Poecilostomatoida
Family: Ergasilidae
Genus: Abergasilus
Hewitt, 1978
Species: A. amplexus
Binomial name
Abergasilus amplexus
Hewitt, 1978

Abergasilus amplexus is a species of parasitic copepod endemic to euryhaline habitats in New Zealand. It is the only known species in the genus Abergasilus.

Description[edit]

This species is unique among ergasilids in that it only has three pairs of legs: the fourth and fifth pairs are reduced to single spines or are completely absent.[1] The second antenna is very distinctive, hooks on the last and penultimate segments creating an obviously claw-like structure, more obvious in the female.[1] The male is free-living, forming part of the plankton.[2] Both sexes have an average length of 0.5 mm.[2]

Hosts[edit]

The main host appears to be Anguilla australis: in Lake Ellesmere, infestation rates on this eel approach 100%, sometimes with over 100 parasites on the gills of a single fish. Other recorded host species include Anguilla dieffenbachii, Arripis trutta, Carassius auratus, Galaxias maculatus, Perca fluviatilis, Pseudophycis bachus, Retropinna retropinna, Rhombosolea leporina, Rhombosolea plebeia and Rhombosolea retiaria.[1]

References[edit]