Heterakis fieldingi n. sp. (Nematoda: Heterakoidea) from the Australian water-rat, with a review of heterakids occurring in mammals
Heterakis fieldingi n. sp. is described from Hydromys chrysogaster. It can be distinguished from Heterakis spumosa, the species it most closely resembles, in that both males and females are much smaller (4.4 and 5.1 mm, versus 9 and 13 mm, respectively for Australian specimens) and males have shorter tails (178 versus 345 ?m) with 9 pairs of caudal papillae compared with 10 pairs for H. spumosa. Of the species of Heterakis previously described from mammals three, H. spalacis, H. macrospiculum and H. verrucosa, are presently considered incertae sedis, a fourth has been referred to the genus Gireterakis and a fifth, H. pandei, described almost simultaneously with H. yamaguti, is considered to be synonymous with it. The remaining species are H. spumosa, H. inglisi and H. yamaguti. The presence of these four species in mammalian hosts, when all other representatives of the genus occur in grain-eating birds, cannot be explained at present.
- 1 - sciences appliquees, technologies et medecines
- 2 - sciences biologiques et medicales
- 3 - sciences biologiques fondamentales et appliquees. psychologie
- 4 - ecologie animale, vegetale et microbienne