摘要：Taxonomic characters of both male and female horse-hair worms Chordodes brasiliensis, and
C. nobilii (Nematomorpha) and female of C. carmelitanus are re-described by scanning electron microscopy.
Sexual dimorphism was found in the cuticular pattern of C. brasiliensis, the male has three different
areolar types but the female shows five different areolar types that includes all three types of areoles as in
the males, but along the ventral and dorsal midline, two further types of areoles are present.
The female cuticle of C. carmelitanus is characterized by three types of areoles, the crown areoles always
occur in pairs on both sides along the ventral midline. Male of C. nobilii has two types of areoles, type 1 are
slightly oval or circular in shape with minute projections on the apical surface. Type 2 areoles occur individually
or in clusters and carry on their apical surface projections that can be short or longer. The female of this
species has three types of areoles. Areoles of types 1 and 2 are very similar to each other. Crowned areoles
(type 3) have quite long apical filaments and occur only along the ventral and the dorsal midline. A neotype
of nobilii is erected as the original material cannot be traced. Host data of C. brasiliensis and new distribution
records of C. brasiliensis and C. nobilii are reported.
关键词：Nematomorpha, Gordiida, Chordodes, South America, scanning electron microscopy.
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