Anguillicoloides novaezelandiae

Anguillicoloides novaezelandiae[1] is a parasitic nematode worm that lives in the swimbladders of eels (Anguilla spp.), particularly Anguilla australiensis, Anguilla anguilla and Anguilla dieffenbachii. Specimens have been located in Italy (where it is thought to have been introduced[2]) and New Zealand (where it is a native species[3]). The species is most similar to A. Australiensis. However, it differs from the latter species in the shape of the head end which is bulbously inflated, almost spherical, and followed by a marked neck constriction in A. Australiensis, whereas it is only slightly expanded in A. novaezelandiae. Also, the anterior ovary in A. australiensis females extends anteriorly to about the mid-length of the oesophagus, while it does not reach the end of the oesophagus in A. novaezelandiae. Both species differ in size and form. While the body of A. australiensis is long (30 millimetres (1.2 in) to 40 millimetres (1.6 in) in males and 60 millimetres (2.4 in) to 70 millimetres (2.8 in) in gravid females) and relatively slender (at most 1.5 millimetres (0.059 in) in gravid females), that of A. novaezelandiae is much shorter (between 6 and 15 millimetres (0.24 and 0.59 in) in males and between 10 and 31 millimetres (0.39 and 1.22 in) in gravid females) and wider (up to 3 millimetres (0.12 in) in gravid females). The shape of the posterior end of the female body is different in these two species.

Anguillicoloides novaezelandiae
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Nematoda
Class: Secernentea
Order: Camallanida
Family: Dracunculidae
Genus: Anguillicoloides
Species:
A. novaezelandiae
Binomial name
Anguillicoloides novaezelandiae
Moravec & Taraschewski, 1988
Synonyms

Anguillicola novaezelandiae

The state of being colonized by Anguillicola nematodes is termed anguillicolosis.

Description

The species is medium-sized and darkly coloured. Epicuticle aspinose. Head end with slight neck constriction just in front of nerve ring. Buccal capsule is smaIl, sclerotised, with minute circumoral teeth. Its oesophagus is expanded at its posterior half. The valvular apparatus of the oesophagus is well developed. Its nerve ring is located below the neck constriction, while its excretory pore is near te junction of the oesophagus and intestine. The latter is dark, almost straight and broad. Three conspicuously large oval unicellular rectal glands are present; an additional small one might also be present. Its tail is conical and pointed. The length of its body is between 5.5 and 8.57 millimetres (0.217 and 0.337 in) in the male; female between 7.17 and 13.63 millimetres (0.282 and 0.537 in).[1]

References
  1. Moravec, F., and H. Taraschewski. "Revision of the genus Anguillicola Yamaguti, 1935 (Nematoda: Anguillicolidae) of the swimbladder of eels, including descriptions of two new species, A. novaezelandiae sp. n. and A. papernai sp. n." Folia Parasitol 35 (1988): 125-146.
  2. Moravec F, Di Cave D, Orecchia P, Paggi L (1994). "Present occurrence of Anguillicola novaezelandiae (Nematoda: Dracunculoidea) in Europe and its development in the intermediate host". Folia Parasitologica. 41 (3): 203–8. PMID 7883252.
  3. Dangel KC, Sures B (April 2013). "Natural Anguillicola novaezelandiae infection--is there seasonality in New Zealand?". Parasitology Research. 112 (4): 1623–30. doi:10.1007/s00436-013-3317-3. PMID 23388731. S2CID 9312354.

Further reading
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