A new species and three subspecies of the desert shrew (Notiosorex) from the Baja California peninsula and California

Author:

Camargo Issac1,Álvarez-Castañeda Sergio Ticul1

Affiliation:

1. Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional 195, La Paz, Baja California Sur, México

Abstract

Abstract Desert shrews of the genus Notiosorex comprise four species with morphological characteristics that are difficult to distinguish among the species. Indeed, N. cockrumi was described using only genetic markers. Based on molecular divergence documented in N. crawfordi, we hypothesize that a fifth species is present in the Baja California peninsula. Genetic variation at the species level was analyzed using individuals from locations west of the Colorado River in the Baja California peninsula, Mexico, and California, United States. Molecular markers of mitochondrial origin (cytochrome b, 1,140 bp; cytochrome c oxidase subunit I, 542 bp; and cytochrome c oxidase subunit III, 672 bp), as well as the nuclear intron 7 of the beta fibrinogen gene (385 bp) were used to construct a phylogeny for species of the genus Notiosorex. Genetic distances of 12.46–15.58% between west and east of the Colorado River were obtained using p-distance models. Our phylogenetic analyses showed almost identical topologies, placing populations from west of the Colorado River in three monophyletic clades with high bootstrap support values. Results of molecular phylogenetic identity among shrews of the genus Notiosorex support the existence of an undescribed, polytypic species of Notiosorex west of the Colorado River.

Funder

Consejo Nacional de Ciencia y Tecnología

Publisher

Oxford University Press (OUP)

Subject

Nature and Landscape Conservation,Genetics,Animal Science and Zoology,Ecology,Ecology, Evolution, Behavior and Systematics

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5. Rediscovery of the extinct Tule shrew (Sorex ornatus juncencis) in the San Quintin plains: a taxonomic reevaluation after 90 years without new records;Camargo;Mammalia,2019

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