Abstract
Representatives of several genera of the family Miraciidae (Copepoda: Harpacticoida) were found in sediment samples taken in the year 2019 from a coastal system in north-western Mexico. The subfamily Diosaccinae (Miraciidae) was by far the most diverse taxon followed by the subfamily Stenheliinae (Miraciidae). Here we report on a new miraciid species, Typhlamphiascus medici sp. nov., and provide a new amended diagnosis for Typhlamphiascus Lang, 1944 along with a key to its species. Additionally, Typhlamphiascus lamellifer lamellifer (Sars, 1911) and T. l. capensis Kunz, 1975 are considered as distinct species and the latter is given full species rank. Upon preliminary inspection, another diosaccin species was thought to be a derived form of Bulbamphiascus Lang, 1944. This promoted us to perform a more in-depth phylogenetic analysis. Our results showed that the new presumed derived form of Bulbamphiascus represents a new genus, Spinodiosaccus gen. nov. and that the genus Bulbamphiascus, which we propose a new amended diagnosis for, could be split into different genera. Also, the possible relationships amongst the different diosaccin clades found during our analyses are commented. We give a brief ecological analysis on the distribution of T. medici sp. nov. and S. primus gen. et sp. nov. in the Urías system.
Highlights
With 53 genera and 479 species (WoRMS Editorial Board 2020), the family Miraciidae Dana, 1846 is one of the most diverse of Harpacticoida
We present the full description of a new species of the problematic genus Typhlamphiascus Lang, 1944, Typhlamphiascus medici sp. nov., and a new species of the so far monotypic new genus Spinodiosaccus gen. nov., S. primus gen. et sp. nov., collected during a sampling campaign carried out in January 2019
In addition to the proposal of Spinodiosaccus gen. nov. for S. primus gen. et sp. nov., we propose Dinetia gen. nov., Pallarica gen. nov. and Spinopedia gen. nov. for B. minutus Dinet, 1971, B. cibimae Pallares, 1982 and B. spinulosus Mu & Gee, 2000, respectively
Summary
With 53 genera and 479 species (WoRMS Editorial Board 2020), the family Miraciidae Dana, 1846 is one of the most diverse of Harpacticoida. The miraciid subfamilies Diosaccinae Sars, 1906a and Stenheliinae Brady, 1880 are the most species rich in the family. These two subfamilies were the most abundant and diverse harpacticoid taxa collected during a series of meiofauna samplings during the year 2019 along the Urías system, a polluted estuary in north-western Mexico (see Gómez 2020a). A report of the subfamily Stenheliinae from the Urías system, with a record of Pseudostenhelia wellsi Coull & Fleeger, 1977, and the description of Lonchoeidestenhelia prote Gómez, 2020 and Willenstenhelia reducta Gómez, 2020, were dealt with in Gómez (2020a). We present the full description of a new species of the problematic genus Typhlamphiascus Lang, 1944, Typhlamphiascus medici sp. Nov., and a new species of the so far monotypic new genus Spinodiosaccus gen. We present the full description of a new species of the problematic genus Typhlamphiascus Lang, 1944, Typhlamphiascus medici sp. nov., and a new species of the so far monotypic new genus Spinodiosaccus gen. nov., S. primus gen. et sp. nov., collected during a sampling campaign carried out in January 2019
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