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Surface ultrastructure of larval Anisakidae (Nematoda: Ascaridoidea) and its identification by mensuration.

The surface ultrastructure of larval Anisakis type I, Anisakis type II, Raphidascaris, Contracaecum type A, Thynnascaris type A and Thynnascaris type B was examined by scanning electron microscopy. These species were identified clearly by the presence of a boring tooth, a mucron, and other morphological features. The means of the distances between transverse striations (DBTS) of larval Anisakis type I (5.45 +/- 0.125 micron), larval Raphidascaris (2.92 +/- 0.051 micron), and larval Contracaecum type A (1.68 +/- 0.056 micron) are significantly different (p less than 0.05). There was a correlation between the diameter of worm trunk (DOWT) and DBTS among these three larval types. In most cases a larva could be identified from the mean value of DBTS and DOWT even if obtained as a fragment from a patient.