D. Stevensonii Has Closer Phylogenetic Affinities with Carretera a Coatepec No
Systematics and Biodiversity 7 (1): 73–79 Issued 22 February 2009 doi:10.1017/S1477200008002879 Printed in the United Kingdom C The Natural History Museum Fernando Nicolalde-Morejon´ 1, Reciprocal illumination of morphological Francisco Vergara-Silva2,∗, Jorge Gonzalez-Astorga´ 3, characters upon a molecular hypothesis Andrew P. Vovides1 & Alejandro Espinosa de los Monteros4 supports the proposal of a new species of 1Laboratorio de Biolog´ıa Evolutiva de Cycadales, cycad from Mexico Departamento de Biolog´ıa Evolutiva, Instituto de Ecolog´ıa, A.C., km 2.5 Antigua Carretera a Coatepec No. 351, Xalapa Abstract The new species Dioon stevensonii, from the Rio Balsas basin spanning 91070, Veracruz, Mexico 2Laboratorio de Sistem´atica the states of Michoacan´ and Guerrero, Mexico, is described and illustrated. The de- Molecular, Instituto de Biolog´ıa scription of this species implies a recircumscription of the populations of Dioon that (Jard´ın Bot´anico), Universidad Nacional Aut´onoma de M´exico, constitutethepreviouslycharacterisedD.tomasellii,whichalsoincludespopulations 3er Circuito Exterior Ciudad located in Durango, Nayarit and Jalisco. Dioon stevensonii differs from its congeners Universitaria, Coyoac´an04510, in characters of both vegetative and reproductive structures – namely, leaflet con- M´exico, D.F., Mexico 3Laboratorio de Gen´etica de tour shape, leaflet curvature and reflection of the megasporophyll tips. Despite its Poblaciones, Departamento de morphological affinities with D. tomasellii, complementary cladistic analyses of mo- Biolog´ıaEvolutiva, Instituto de Ecolog´ıa, A.C., km 2.5 Antigua lecular matrices indicate that D. stevensonii has closer phylogenetic affinities with Carretera a Coatepec No. 351, the D. edule and D. spinulosum species groups, which are distributed along the Gulf Xalapa 91070, Veracruz, Mexico of Mexico and Caribbean seaboards.
[Show full text]