Studies on the morphology of Macrolaimus arboreus Truskova & Eroshenko, 1977 (Rhabditida: Chambersiellidae) from Iran

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A population of Macrolaimus arboreus was collected from the rhizosphere of pine in Iran. This population of M. arboreus is characterised by the body length, 800-1010 μm in females, lip region with six seta-like papillae directed anteriad, stoma nearly as long as wide (9-11 × 7 μm), with cheilostom slightly longer than gymnostom and cheilorhabdia and gymnorhabdia well-developed, pharyngeal corpus 1.8-2.0 times the isthmus length, with slightly swollen metacorpus, excretory pore located at isthmus level, female reproductive system monodelphic-prodelphic reflexed with short post-vulval uterine sac, female tail conical (57-67 μm, c = 13.7-15.0, c′ = 3.5-3.8), ending in an acute tip which is weakly curved dorsad, and phasmids at 54-60% of tail length. Measurements and illustrations, including SEM, are provided.


International Journal of Fundamental and Applied Nematological Research



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  • Macrolaimus arboreus Truskova & Eroshenko, 1977. A: Anterior region; B: Stoma; C: Reproductive system; D: Entire female; E: Lateral field; F: Female posterior end.

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  • Macrolaimus arboreus Truskova & Eroshenko, 1977 (light microscope, female). A: Neck (white arrow pointing to excretory pore, black arrow pointing to hemizonid); B: Anterior end; C, D: Reproductive system (arrow pointing to spermatheca); E: Lateral field (arrows pointing to lines); F: Ovijector; G, H: Posterior end (arrow pointing to phasmid); I: Entire female.

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  • Macrolaimus arboreus Truskova & Eroshenko, 1977 (scanning electron microscope, female). A: Neck (white and black arrows pointing to excretory pore and deirid, respectively); B-E, H: Lip region in dorsal, lateral, subdorsal, dorsal and frontal views, respectively (arrow pointing to amphid); F: Excretory pore (white arrow) and deirid (black arrow); G: Vulval region in lateral view; I, J: Posterior end in lateral and ventral views, respectively (arrow pointing to phasmid); K: Lateral field.

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  • Measurements of Macrolaimus arboreus Truskova & Eroshenko, 1977 from Iran and the type material. All measurements are in μm and in the form: mean ± s.d. (range) where possible.

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