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Five new species of Oncholaimellus (Oncholaimidae: Nematoda) from north-east Brazil, with an emended diagnosis and an updated key to the genus

  • Patrícia Fernandes Neres (a1), Maria Cristina da Silva (a1), Geruso Vieira de Miranda-Júnior (a1), Verônica Fonsêca-Genevois (a1) and André Morgado Esteves (a1)...


Five new species of Oncholaimellus are described. They were found in macrofauna samples from the continental shelf in the Potiguar Basin, north-east Brazil. Cuticular pores with a sclerotized outline associated with a gland were observed in some species. Oncholaimellus multiporus sp. nov. is differentiated from other species by the presence of cuticular pores of different sizes; the smaller pores are abundant and give an appearance of ornamentation. Oncholaimellus intersexus sp. nov. and O. distortus sp. nov. are similar, but differ in the size of the external labial and cephalic setae compared to the corresponding diameter, the presence of the cuticular pores and the tail shape. Oncholaimellus paulus sp. nov. and O. sineporus sp. nov. are similar, although features such as the external labial and cephalic setae size compared to the corresponding diameter and the cuticular pores differentiate between them.


Corresponding author

Correspondence should be addressed to: A.M. Esteves, Universidade Federal de Pernambuco, Avenida Professor Moraes Rego, s/n, Departamento Zoologia, Cidade Universitária, Recife, Pernambuco 50670-901. Brazil email:


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