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<p>Diplogastrids are predominantly terrestrial nematodes, largely occurring in saprobic habitats. They largely represent the bacterivores or predators that often demonstrate phoretic or necromenic associations with insects. During a survey of saprobic habitats, five populations of the genus <i>Acrostichus</i>, belonging to the family Diplogastridae, were recovered. Further detailed study of the samples confirmed the presence of three new and two known species of the genus. <i>A. bifurcatus</i> sp. n. is characterised by an anisotopic gymnostom; anisotopic and anisomorphic stegostom, dorsal metastegostomal wall with a small pyramidal tooth; large kidney–shaped <i>receptaculum seminis</i>; spicules fused at the tips, deeply bifurcated with a ventral attenuated arm; gubernaculum boat–shaped, 68–76% of spicule length with wing–like lateral expansion. <i>A. erectodentatus</i> sp. n. is characterised by an anisotopic gymnostom; anisotopic and anisomorphic stegostom, dorsal metastegostomal wall with a long, straight flap–like tooth; spicules smoothly curved with pointed distal tips; gubernaculum leaf–like, caudal (dorsal) margin interrupted, with crochet–shaped distal tip, 67–71% of spicule length. <i>A. monodelphis</i> sp. n. has a robust body, anisotopic and anisomorphic stegostom, dorsal metastegostomal wall with a small pyramidal tooth; monodelphic gonad; large kidney–shaped <i>receptaculum seminis</i>; spicules with a ventral attenuated arm and sickle–shaped distal part; gubernaculum trough–shaped with collar–like distal tip, 70–83% of spicule length. <i>A. nudicapitatus</i> is redescribed with an emended diagnosis. The genus <i>Pseudacrostichus</i> Yousuf et al., 2016 is synonymised with <i>Acrostichus</i> and <i>A. musai</i> comb. n. redescribed by incorporating SEM observations<i>.</i> A comparative analysis of morphometrics and morphological traits of <i>Acrostichus</i> species, along with a key to their identification, is provided.</p>

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Phenotypic characterization of three novel and two known species of Acrostichus Rahm, 1928 (Nematoda: Diplogastridae) using light and scanning electron microscopy

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Sabia Mumtaz,
  • Nadia Sufyan,
  • Irfan Ahmad,
  • Qudsia Tahseen

摘要

Diplogastrids are predominantly terrestrial nematodes, largely occurring in saprobic habitats. They largely represent the bacterivores or predators that often demonstrate phoretic or necromenic associations with insects. During a survey of saprobic habitats, five populations of the genus Acrostichus, belonging to the family Diplogastridae, were recovered. Further detailed study of the samples confirmed the presence of three new and two known species of the genus. A. bifurcatus sp. n. is characterised by an anisotopic gymnostom; anisotopic and anisomorphic stegostom, dorsal metastegostomal wall with a small pyramidal tooth; large kidney–shaped receptaculum seminis; spicules fused at the tips, deeply bifurcated with a ventral attenuated arm; gubernaculum boat–shaped, 68–76% of spicule length with wing–like lateral expansion. A. erectodentatus sp. n. is characterised by an anisotopic gymnostom; anisotopic and anisomorphic stegostom, dorsal metastegostomal wall with a long, straight flap–like tooth; spicules smoothly curved with pointed distal tips; gubernaculum leaf–like, caudal (dorsal) margin interrupted, with crochet–shaped distal tip, 67–71% of spicule length. A. monodelphis sp. n. has a robust body, anisotopic and anisomorphic stegostom, dorsal metastegostomal wall with a small pyramidal tooth; monodelphic gonad; large kidney–shaped receptaculum seminis; spicules with a ventral attenuated arm and sickle–shaped distal part; gubernaculum trough–shaped with collar–like distal tip, 70–83% of spicule length. A. nudicapitatus is redescribed with an emended diagnosis. The genus Pseudacrostichus Yousuf et al., 2016 is synonymised with Acrostichus and A. musai comb. n. redescribed by incorporating SEM observations. A comparative analysis of morphometrics and morphological traits of Acrostichus species, along with a key to their identification, is provided.