Sousa Francisco Diogo R, Elmoor-Loureiro Lourdes Maria Abdu, Santos Sandro
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.
Laboratório de Biodiversidade Aquática, Universidade Católica de Brasília - UCB, QS7 lote 1, Bloco M, sala 204, CEP 71966-700, Taguatinga, DF, Brazil.
Zookeys. 2016 May 4(586):95-119. doi: 10.3897/zookeys.586.8209. eCollection 2016.
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.
巨刺溞属（Magnospina）新属的建立是为了将宽额溞属广义（Alona sensu lato，甲壳纲：枝角亚目）中齿状溞组的物种重新归类，包括齿状巨刺溞（Magnospina dentifera）新组合及暹罗巨刺溞（Magnospina siamensis）新组合。巨刺溞属新属的共有衍征为：（1）基部刺长于腹爪的2/3；（2）有1至4个大齿，基部宽，向下突出，其间无小刚毛。诸如体型、吻部和腹后部形状、内肢后侧刚毛的武装、第三肢外肢上刚毛的数量等形态特征，在区分巨刺溞属新属与冠状溞分支中的其他属时也很重要。齿状巨刺溞雄性的形态证实了它与宽额溞属广义中的优雅溞组、卵形溞属（Ovalona）和莱氏溞属（Leberis）所组成的进化枝关系更为密切，但外部形态、腹爪形态、基部刺以及内肢后侧刚毛2至3的形态支持将它们与上述任何一个类群区分开来。得出的结论是，隆腺溞亚科（Aloninae）的冠状溞谱系由冠状溞属（Coronatella）、无饰隆腺溞属（Anthalona）、卡氏隆腺溞属（Karualona）、贝氏隆腺溞属（Bergamina）、顶饰隆腺溞属（Extremalona）、卵形溞属、高角溞属（Celsinotum）、莱氏溞属和巨刺溞属新属组成。宽额溞属广义中的优雅溞组也属于冠状溞谱系，但仍需正式归类。
