Abstract
Description of Macroposthonia annulatiformis n. sp., found in large numbers in moist meadow soil at Oegstgeest, the Netherlands. Females are characterized by having about 100 annules, spear length 54-65 μ, acute tail and open vulva with slight ornamentation on the anterior lip. Males have an acute tail bent sharply ventrad, and are relatively slender. Old, egg-laying females tend to be more slender than younger ones, which no doubt is connected with the peculiar annulation in this genus. The differences from M. annulata De Man, 1880, M. raskiensis (De Grisse, 1964) De Grisse & Loof, 1965, and M. reedi (Diab & Jenkins, 1966) nov. comb. are given.
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