The monospecific Lamanema historically has been assigned to the Nematodirinae within the Molineidae. Inconsistencies in morphological characters, within a phylogenetic context for Nematodirinae, led to a re-evaluation of the putative relationships and taxonomic placement of Lamanema. Among 7 putative synapomorphies for Nematodirinae, Lamanema possesses only 1, large eggs. Large eggs, sporadically present in phylogenetically disparate taxa of trichostrongyles, are equivocal with respect to placement of Lamanema; it is considered that possession of this single homoplasious character alone is insufficient justification to retain the genus in Nematodirinae. Affinities with the Trichostrongylidae (Cooperiinae or Haemonchinae) have also been proposed; however, Lamanema possess neither of 2 synapomorphies that diagnose monophyly of the family. Lamanema is retained in the Molineidae and transferred to the Molineinae as it possesses all characters of the family as currently defined. The origin of Lamanema represents a secondary colonization of ruminants by molineids and provides no context for elucidating the history of the Nematodirinae and Nematodirus.
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June 2000
RESEARCH NOTES|
June 01 2000
Reassignment of Lamanema from Nematodirinae to Molineinae (Nematoda: Trichostrongyloidea)
Lora G. Rickard;
Lora G. Rickard
aCollege of Veterinary Medicine, P.O. Box 9825, Mississippi State University, Mississippi State, Mississippi 39762
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Eric P. Hoberg
Eric P. Hoberg
aCollege of Veterinary Medicine, P.O. Box 9825, Mississippi State University, Mississippi State, Mississippi 39762
bBiosystematics and National Parasite Collection Unit, USDA, Agricultural Research Service, BARC East No. 1180, 10300 Baltimore Avenue, Beltsville, Maryland 20705 (order of authorship is arbitrary)
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J Parasitol (2000) 86 (3): 647–650.
Citation
Lora G. Rickard, Eric P. Hoberg; Reassignment of Lamanema from Nematodirinae to Molineinae (Nematoda: Trichostrongyloidea). J Parasitol 1 June 2000; 86 (3): 647–650. doi: https://doi.org/10.1645/0022-3395(2000)086[0647:ROLFNT]2.0.CO;2
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