Geomydoecus alcorni Price & Emerson, 1971



Taxonomy & Nomenclature



Conservation Status


Last record: 1998 or before


A louse species, Geomydoecus alcorni, has only been recorded from Pappogeomys bulleri alcorni (Price & Emerson, 1971; Emerson & Price, 1981; Price & Emerson, 1989; Hellenthal & Price, 1991; Price et al., 2003; Demastes et al., 2012), and therefore may have gone co-extinct as the last record of the host dates to 1998 (Castro-Arellano et al., 2016; Lee et al., 2017) and it is considered missing (Hafner et al., 2009; Lee et al., 2017). Sánchez-Montes et al. (2018) list a host record for Pappogeomys bulleri albinasus, which would prevent the louse from being host-specific, but they cite (Demastes et al., 2012) as the basis of the record which does not actually contain such a record. Given that the only known host represents an isolated population from other P. bulleri ssp. (fide Demastes et al., 2003), this lends some support to the supposition that G. alcorni is host-specific, though this is clearly far from conclusive given the relative lack of work into parasites in general.



immediate vicinity (within 9.6 km) Mazamitla, La Sierra del Tigre, Jalisco State (south), México (Demastes et al., 2003:753)


Anatomy & Morphology



Biology & Ecology










Original scientific description:

Price, R. D. and Emerson, K. C. (1971). A revision of the genus Geomydoecus (Mallophaga: Trichodectidae) of the New World pocket gophers (Rodentia: Geomyidae). Journal of Medical Entomology 8: 228-257.


Other references:

Castro-Arellano, I., Vázquez, E., Cuarón, A. and Álvarez, S. (2016). Pappogeomys bulleri ssp. alcorni. The IUCN Red List of Threatened Species 2016: e.T16023A101244395. Downloaded on 03 October 2016.

Demastes, James W., Butt, Andrea L., Hafner, Mark S. and Light, Jessica E. (2003). Systematics of a rare species of pocket gopher, Pappogeomys alcorni. Journal of Mammalogy 84(2): 753-761.

Demastes, James W., Spradling, T.  A., Hafner, M. S., Spies, G. R., Hafner, D. J. and Light, J. E. (2012). Cophylogeny on a fine scale: Geomydoecus chewing lice and their pocket gopher hosts, Pappogeomys bulleri. Journal of Parasitology 98(2): 262-270.

Emerson, K. C. and Price, R. D. (1981). A host-parasite list of the Mallophaga on mammals. Miscellaneous Publications of the Entomological Society of America 12(1): 1-72.

Hafner, M. S., Hafner, D. J., Demastes, J. W., Hasty, G. L., Light, J. E. and Spradling, T.  A. (2009). Evolutionary relationships of pocket gophers of the genus Pappogeomys (Rodentia: Geomyidae). Journal of Mammalogy 90(1): 47-56.

Hellenthal, R. A. and Price, R. D. (1991). Biosystematics of the chewing lice of pocket gophers. Annual Review of Entomology 36: 185-203. [pp. 192-193] 

Lee, T. E., Fisher, D. O., Blomberg, S. P. and Wintle, B. A. (2017). Extinct or still out there? Disentangling influences on extinction and rediscovery helps to clarify the fate of species on the edge. Global Change Biology 23(2): 621-634.

Price, R. D. and Emerson, K. C. (1989). Geomydoecus (Mallophaga: Trichodectidae) from Pappogeomys and Zygogeomys pocket gophers (Rodentia: Geomyidae) in Central America. Journal of Medical Entomology 26: 385-401.

Price, R. D., Hellenthal, R. A. and Palma, R. L. (2003). World checklist of chewing lice with host associations and keys to families and genera. The chewing lice: world checklist and biological overview. Illinois Natural History Survey Special Publication, 24: 1-448.

Sánchez-Montes, Sokani, Colunga-Salas, Pablo, Álvarez-Castillo, Lucía, Guzmán-Cornejo, Carmen and Montiel-Parra, Griselda. (2018). Chewing lice (Insecta: Phthiraptera) associated with vertebrates in Mexico. Zootaxa 4372(1): 1-109.


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