New proposal for a detailed description of the dorylaim spicule (Nematoda: Dorylaimida)

in Nematology
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The morphology of dorylaimid spicules is richer than usually conceived and shows interesting interspecific variations that have not received much attention. New ideas are proposed to describe these structures, including a delimitation or definition of their parts and a series of morphometrics, either (absolute) measurements or ratios. Three descriptive examples are presented. Several morphological characters (head shape, development of the ventral hump, etc.) and a number of morphometric features (total and relative lengths, relative size of the median piece, terminal tip width, etc.) are especially useful for species characterisation and comparative purposes.


International Journal of Fundamental and Applied Nematological Research



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  • Variability of dorylaimid spicules. A: Aporcelaimellus obtusicaudatus; B, C: Belondira spp.; D: Crassolabium aenigmaticum; E: Enchodelus longicaudatus; F: Morasia sp.; G: Sectonema sp.; H: Stenodorylaimus textilis. (Scale bars: A, G, H = 20 μm; B-F = 10 μm.)

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  • General morphology of a dorylaimid spicule, showing its most relevant parts and regions.

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  • Three types of dorylaimid spicules, which are described in the text. A: Sectonema sp.; B: Epacrolaimus sp.; C: Belondira sp.

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