title: Position of the dentifera-group in the Coronatella-branch and its relocation to a new genus: Magnospina gen. n. (Crustacea, Chydoridae, Aloninae).
abstract: Magnospina gen. n. was created to relocate species of the dentifera-group from Alona sensu lato (Crustacea: Cladocera) and include Magnospina dentifera comb. n. and Magnospina siamensis comb. n. The synapomorphies of the Magnospina gen. n. are (1) basal spines longer than 2/3 of the postabdominal claw, (2) presence of 1-4 large denticles, broad at their bases, protruding downwards, without setules between them. Morphological traits such as habitus, rostrum and postabdomen shape, armature of IDL setae, number of setae on the exopod of limb III are also important in the distinction between Magnospina gen. n. and other genera from the Coronatella-branch. The morphology of Magnospina dentifera comb. n. male confirms the closer relationship with the clade composed by the elgans-group from Alona sensu lato, Ovalona and Leberis, but the external morphology, morphology of the postabdominal claw, basal spine and setae 2-3 of IDL support their separation from any of the group cited. It is concluded that the Coronatella-lineage of Aloninae is composed of the genera Coronatella, Anthalona, Karualona, Bergamina, Extremalona, Ovalona, Celsinotum, Leberis and Magnospina gen. n. The elegans-group from Alona sensu lato also belongs to Coronatella-lineage, but still need formal allocation.
authors.affiliation: Núcleo de Estudos em Biodiversidade Aquática, Programa de Pós-graduação em Biodiversidade Animal, Universidade Federal de Santa Maria - UFSM, Av. Roraima 1000, Camobi, CEP 97105-900, Santa Maria, RS, Brazil; Laboratório de Biodiversidade Aquática, Universidade Católica de Brasília - UCB, QS7 lote 1, Bloco M, sala 204, CEP 71966-700, Taguatinga, DF, Brazil.
authors.forename: Francisco Diogo R
authors.initials: FD
authors.lastname: Sousa
authors.affiliation: Laboratório de Biodiversidade Aquática, Universidade Católica de Brasília - UCB, QS7 lote 1, Bloco M, sala 204, CEP 71966-700, Taguatinga, DF, Brazil.
authors.forename: Lourdes Maria Abdu
authors.initials: LM
authors.lastname: Elmoor-Loureiro
authors.affiliation: Núcleo de Estudos em Biodiversidade Aquática, Programa de Pós-graduação em Biodiversidade Animal, Universidade Federal de Santa Maria - UFSM, Av. Roraima 1000, Camobi, CEP 97105-900, Santa Maria, RS, Brazil.
authors.forename: Sandro
authors.initials: S
authors.lastname: Santos
keywords: Alona broaensis; Alona dentifera; Alona siamensis; Celsinotum; Leberis; Ovalona; male; morphology