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BackgroundThe clade   Diplogastridae    Micoletzky 1922  largely represents the bacterivorous or predatory nematodes that very often demonstrate phoretic, necromenic or parasitic associations with insects ( Sudhaus and Fürst von Lieven 2003 ). That is the reason, much of the diversity of the family remains undocumented because of their absence from routine soil samples. Due to their variable habitats and niches, these nematodes show ample variation in their stomal armature, feeding behavior and life cycle patterns.New informationThe paper describes and illustrates a new diplogastrid species of genus    AcrostichusRahm 1928  that appears to be the link between the genera    DiplogastrellusParamonov et al. 1952a  and    Acrostichus   .    Acrostichus   medius    n. sp. is characterised by hermaphroditic females and males having faintly striated longitudinal ridges, demarcated lateral fields, amalgamated lips, six adradial cheilostomal plates, moderately-built dorsal tooth, relatively smaller posterior genital branch; large oval uterine pouch and males with robust, heavily cuticularised spicules, each with hood-like capitulum, deeply forked distal end with fine extensions and a ventral attenuated arm; gubernaculum 2/3 of spicule length and rudiments of bursa confined to posterior four pairs of genital papillae. The biogeographical distribution of    Acrostichus    has been mapped and the relationship between congeners has been analysed cladistically and discussed.

biodiversity data journal

Description of a new species of    Acrostichus    Rahm 1928 (  Nematoda  :   Diplogastridae  ) from India with a note on its position and relationship with the congeners