Document Detail

An exploration of diversity among the Ostertagiinae (Nematoda: Trichostrongyloidea) in ungulates from Sub-Saharan Africa with a proposal for a new genus.
MedLine Citation:
PMID:  18372646     Owner:  NLM     Status:  MEDLINE    
Abomasal nematodes (Ostertagiine: Trichostrongyloidea) representing a previously unrecognized genus and species are reported in African buffalo (Syncerus caffer caffer) from Kenya, Uganda, and South Africa. Africanastrongylus buceros gen. nov. et sp. nov. is characterized by a symmetrical tapering synlophe in the cervical region and a maximum of 60 ridges in males and females. Bursal structure is 2-2-1, with subequal Rays 4/5, massive Rays 8, and Rays 9/10, and a massive dorsal lobe that is reduced in length, laterally and dorsally inflated, and positioned ventral to externodorsal rays. Spicules are tripartite, and the gubernaculum is broadly alate in the anterior. A proconus is present. Among ostertagiines with a 2-2-1 bursa (Cervicaprastrongylus, Hyostrongylus, Mazamastrongylus, Sarwaria, Spiculopteragia, and Teladorsagia) specimens of Africanastrongylus are differentiated from respective genera based on the structure of the cervical synlophe, patterns of dorsal, externodorsal, lateral, and ventral rays, and configuration of the genital cone, gubernaculum, and spicules. Among 13 genera of the Ostertagiinae in the global fauna, 3 are entirely limited in distribution to Africa, including Africanastrongylus, Longistrongylus, and Pseudomarshallagia. Another 5 genera including Cervicaprastrongylus, Hyostrongylus, Marshallagia, Ostertagia, and Teladorsagia are represented as mosaics, with diversity centered in Eurasia or the Holarctic. Genera not represented in the African fauna include Camelostrongylus among Caprinae and some Antelopinae from Eurasia, Mazamastrongylus and Spiculopteragia in Cervidae from the Holarctic and Eurasia, respectively, Orloffia in Cervidae and Bovidae from the Holarctic, and Sarwaria among Tragulidae and Bovinae in southern Asia. The diverse nature of the ostertagiine fauna, with a disproportionate number of endemic genera relative to other regions of the northern hemisphere, may reflect the timing of episodic expansion events for artiodactyls into Africa from Eurasia during the Tertiary and Quaternary.
Eric P Hoberg; Arthur Abrams; Vanessa O Ezenwa
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of parasitology     Volume:  94     ISSN:  0022-3395     ISO Abbreviation:  J. Parasitol.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-03-31     Completed Date:  2008-04-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7803124     Medline TA:  J Parasitol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  230-51     Citation Subset:  IM    
U.S. National Parasite Collection and Animal Parasitic Diseases Laboratory, Agricultural Research Service, United States Department of Agriculture, BARC East 1180, 10300 Baltimore Avenue, Beltsville, Maryland 20705, USA.
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MeSH Terms
Africa South of the Sahara
Buffaloes / parasitology*
Microscopy, Interference / veterinary
Trichostrongyloidea / anatomy & histology,  classification*,  ultrastructure
Trichostrongyloidiasis / parasitology,  veterinary*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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