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首页> 外文期刊>Parasitology >Leptomonas costaricensis sp. n. (Kinetoplastea: Trypanosomatidae), a member of the novel phylogenetic group of insect trypanosomatids closely related to the genus Leishmania.
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Leptomonas costaricensis sp. n. (Kinetoplastea: Trypanosomatidae), a member of the novel phylogenetic group of insect trypanosomatids closely related to the genus Leishmania.

机译：Leptomonas costaricensis sp。 。 （Kinetoplastea：锥虫科），是与利什曼原虫属密切相关的新型昆虫锥虫科系统发育组的成员。

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摘要

A flagellate isolated from the intestinal tract of a reduviid bug Ricolla simillima (Heteroptera) in Costa Rica was found to represent a new trypanosomatid species by the phylogenetic analysis of small subunit ribosomal RNA (SSU rRNA), glyceraldehyde phosphate dehydrogenase (GAPDH) and large subunit of RNA polymerase II (RPOIILS) genes. The phylogenetic position of this trypanosomatid, together with its typical promastigote morphology and the host identity, allowed its classification as a species that belongs to the polyphyletic genus Leptomonas. Interestingly, the new species was revealed as a member of the novel phylogenetic clade representing the closest known relative of Leishmania. With the new species used as an outgroup to root the Leishmania RPOIILS phylogenetic tree, the lineage of the Neotropical species L. enriettii was found to branch off early, and was followed by a deep split between the Old World and the remaining New World species. This tree topology supports the hypothesis that the initial transition to dixenous parasitism in this group pre-dated the continental split and that afterwards the Neotropical and the Old World groups evolved largely independently.
机译：通过对小亚基核糖体RNA（SSU rRNA），甘油醛磷酸脱氢酶（GAPDH）和大亚基的系统发育分析，发现了从哥斯达黎加的小虫Ricolla simillima（Heteroptera）的肠道分离出的鞭毛。 RNA聚合酶II（RPOIILS）基因的鉴定。该锥虫的系统发育位置，连同其典型的前鞭毛体形态和宿主身份，使其可以归类为属于多系统属Leptomonas的物种。有趣的是，该新物种被揭示为代表着利什曼原虫的最亲近亲属的新型系统进化进化论的成员。将新物种作为外来根系利什曼原虫RPOIILS的系统树，发现新热带物种L. enriettii的血统很早就分支了，随后在旧世界和其余新世界物种之间进行了深层分裂。该树形拓扑支持以下假设：该组中最初向二阶寄生的过渡是在大陆分裂之前发生的，而新热带和旧世界组则在很大程度上独立地演化了。

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