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.
Highlights
The taxonomic status of Alona dentifera (Sars, 1901) (Crustacea: Cladocera) was discussed by Sinev et al (2004)
Other specific morphological traits are observed in Magnospina gen. n.: presence of a distinctive rounded angle at 1/3 of the length of ventral margin of carapace, setae on the valves differentiated in three groups with the anterior group markedly longer than median and posterior groups, prominent preanal angle at postabdomen, setae 2–3 of IDL armed with basal denticles, six setae on limb III, and absent limb VI
The morphology of head shield, main head pores and of some structures of the limbs are different between M. dentifera comb. n. and M. siamensis comb. n.; analogous variation in these structures was already observed in Euryalona (Rajapaksa and Fernando 1987)
Summary
The taxonomic status of Alona dentifera (Sars, 1901) (Crustacea: Cladocera) was discussed by Sinev et al (2004). The authors relocated Alonella dentifera to the genus Alona Baird, 1843 based on the absence of typical morphological traits of the subfamily Chydorinae Dybowsky & Grochowski, 1894 emend. 1967 and presence of some morphological traits of Aloninae Dybowsky & Grochowski, 1894 emend. Most recently, Sinev (2015a) included the pulchella-group in Ovalona Van Damme & Dumont, 2008
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