Two new genera and one new species of freshwater crabs of the subfamily Pseudothelphusinae (Decapoda: Brachyura: Pseudothelphusidae) from southwestern Mexico

We present the complete mitochondrial genome of Tzotzilthelphusa villarosalensisVillalobos & Álvarez, 2013, a freshwater crab from Mexico. This is the first mitochondrial genome reported for the superfamily Pseudothelphusoidea. We performed a de novo assembly from genome skimming reads. The mitochondrial genome of T. villarosalensis has a length of 17,203 bp and its gene topology is similar to other freshwater and marine families, e.g., the position of the cytochrome oxidase complex subunits and ATA synthetase, even the order of nad3, nad5, nad4, nad4L, nad6, and cytb. By contrast, the order and organization of genes like the 16S, 12S, and nad1 are different depending on the phylogenetic group with which they are compared. The phylogenetic analyses placed T. villarosalensis as a sister group of all freshwater crabs reported until now and as part of the subsection Heterotremata. This complete mitochondrial genome could be a reference for further genomic studies of the family Pseudothelphusidae and other primary freshwater crabs.

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The complete mitochondrial genome of the freshwater crab Tzotzilthelphusa villarosalensis Villalobos & Álvarez, 2013 (Brachyura: Decapoda: Pseudothelphusidae: Raddausinae) from Mexico

Moreno-Juárez

Jiménez-Marín

Vera‐Paz

et al. 2023

Journal of Crustacean Biology

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Xoconochcothelphusa, a new genus for Ehecatusa chiapensis (Rodríguez & Smalley, 1972), with notes on Spirothelphusa Pretzmann, 1965 (Crustacea: Decapoda: Pseudothelphusidae)

VILLALOBOS-HIRIART,

MORENO-JUÁREZ,

ÁLVAREZ

2024

Zootaxa

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The species of the genus Ehecatusa Ng & Low, 2010, E. chiapensis (Rodríguez & Smalley, 1972) and E. mixtepensis (Rodríguez & Smalley, in Smalley, 1970), were referred to as incertae sedis in the classification system of the tribe Pseudothelphusini Ortmann, 1897, proposed by Villalobos-Hiriart (2005) and Villalobos & Alvarez(2010) and as members of the subfamily Pseudothelphusinae in the recent phylogenetic proposal by Álvarez et al. (2020), supported with morphology and molecular information. The recent discovery of a new specimen of E. chiapensis, from Chiapas, Mexico, comes to expose again the unresolved taxonomic situation of this species in the genus Ehecatusa. New morphologic evidence from the male first gonopod and a phylogenetic analysis based on partial DNA sequences of mitochondrial and nuclear genes (COI, 16S and H3), support the placement of the two species in different genera. Consequently, Xoconochcothelphusa n. gen. is erected to receive X. chiapensis n. comb. The phylogenetic relationships of X. chiapensis n. gen., n. comb. and E. mixtepensis with other genera of the subfamily Pseudothelphusinae Ortmann, 1893 (Ehecatusa, Smalleyus Alvarez, 1989, and Spirothelphusa Pretzmann, 1965) distributed in Mexico, are examined and a key to the identification of the genera of this subfamily is provided.

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Two new genera and one new species of freshwater crabs of the subfamily Pseudothelphusinae (Decapoda: Brachyura: Pseudothelphusidae) from southwestern Mexico

Cited by 2 publications

References 26 publications

The complete mitochondrial genome of the freshwater crab Tzotzilthelphusa villarosalensis Villalobos & Álvarez, 2013 (Brachyura: Decapoda: Pseudothelphusidae: Raddausinae) from Mexico

The complete mitochondrial genome of the freshwater crab Tzotzilthelphusa villarosalensis Villalobos & Álvarez, 2013 (Brachyura: Decapoda: Pseudothelphusidae: Raddausinae) from Mexico

Xoconochcothelphusa, a new genus for Ehecatusa chiapensis (Rodríguez & Smalley, 1972), with notes on Spirothelphusa Pretzmann, 1965 (Crustacea: Decapoda: Pseudothelphusidae)

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