Abstract
A new species of the genus Mastigodiaptomus Light, 1939, named Mastigodiaptomus cuneatus sp. n. was found in a freshwater system in the City of Mazatlán, in the northern region of Mexico. Morphologically, the females of this new species are distinguishable from those of its congeners by the following combination of features: the right distal corner of the genital double-somite and second urosomite have a wedge-shaped projection, the fourth urosomite has no dorsal projection and its integument is smooth. The males are distinct by the following features: the right caudal ramus has a wedge-shaped structure at the disto-ventral inner corner; the basis of the right fifth leg has one triangular and one rounded projection at the distal and proximal margins, respectively, plus one hyaline membrane on the caudal surface close to the inner margin; the aculeus length is almost the width of the right second exopod (Exp2); and the frontal and caudal surfaces of the right Exp2 are smooth. Furthermore, the analysis of the COI gene of Mastigodiaptomus cuneatus sp. n. has revealed that Mastigodiaptomus albuquerquensis (Herrick, 1895) is its nearest congener, with 18.64% of genetic distance. A key for the identification of the known species of the genus is provided.
Highlights
M. cuneatus sp. n. can be separated from M. amatitlanensis by the following features: the dorsal projection on the last pediger absent vs. present; the genital double-somite with vs. without a protrusion on the distal right side; on the genital double-somite, the right spine located at a higher level than the left spine vs. both left and right spines placed at same level; and the endopod of fifth leg long and 2-segmented vs. short and 1-segmented
Results related with the COI gene suggested that M. cuneatus sp. n. is genetically closest to M. albuquerquensis s. str. and the species recorded in Mexico with one sclerotization on the right basis of fifth leg of males such as M. patzcuarensis
Whereas the distal margins of prosomites are pilose in females and males of M. patzcuarensis, these structures are nude in M. cuneatus sp. n and they have tiny spinules on lateral margins in M. albuquerquensis
Summary
O. Sars, 1903 is one of the most common families of freshwater copepods worldwide, some genera of this family have restricted distributional patterns and present endemic forms, as the genus Mastigodiaptomus Light, 1939. 1903 is one of the most common families of freshwater copepods worldwide, some genera of this family have restricted distributional patterns and present endemic forms, as the genus Mastigodiaptomus Light, 1939 Recent studies of this genus in the Neotropical region have added new species of these diaptomids (Gutiérrez-Aguirre and Cervantes-Martínez 2013) or the morphological and genetic analysis have produced recognition of species such as M. patzcuarensis (Kiefer, 1938) (Gutiérrez-Aguirre et al 2014). S. Wilson, 1941), M. albuquerquensis (Herrick, 1895), M. patzcuarensis (Kiefer, 1938), M. montezumae (Brehm, 1955), M. nesus Bowman, 1986, M. maya Suárez-Morales & Elías-Gutiérrez, 2000, M. reidae Suárez-Morales & Elías-Gutiérrez, 2000, and M. suarezmoralesi Gutiérrez-Aguirre & Cervantes-Martínez, 2013
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