- 1A comparative account of the structure of the head in the nematode family Heterakidae is given and the basic structure of the head is shown to be constant throughout the family.
- 2The cordons which occur in the genera Aspidodera, Ansiruptodera, Sexansodera, Pseudaspidodera and Spinaspidodera are shown to be homologous with the interlabial grooves of Odontoterakis. Their derivation from inter labia is discussed.
- 3Aspidoderidae fam. nov. has been erected for those genera which are restricted to marsupials, edentates and true mammals in South America.
- 4This family contains two subfamilies; Aspidoderinae Skrjabin and Schikhobalova, 1947 for the genera Aspidodera, Ansiruptodera, Sexansodera. which have cephalic cordons and Paraspidoderinae subfam. nov. in which the type, and only genus, Paraspidodera does not have such structures.
- 5The genus Gireterakis is shown to be distinct from the genus Heterakis in the presence of straight tubular cordons on the head and in the structure of the tail.
- 6The systematic position of the genus Paraspidodera is discussed and it is considered to be a valid genus closely related to the genera placed in the subfamily Aspidoderinae.
- 7Paraspidodera sellsi is considered, provisionally, to be a species incertae sedis.
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