Université des Sciences et de la Technologie Houari Boumediene, Faculté des Sciences Biologiques, Laboratoire de Biodiversité et Environnement: Interactions - Génomes, BP 32, El Alia, Bab Ezzouar, 16111 Alger, Algérie.
Service de Systématique Moléculaire, UMS 2700 CNRS, Muséum National d'Histoire Naturelle, Sorbonne Universités, 43 Rue Cuvier, CP 26, 75231 Paris Cedex 05, France - UMR7245 MCAM, Muséum National d'Histoire Naturelle, 61, Rue Buffon, CP52, 75231 Paris Cedex 05, France.
Parasite. 2020;27:50. doi: 10.1051/parasite/2020046. Epub 2020 Aug 18.
The presence/absence and number of vaginae is a major characteristic for the systematics of the Monogenea. Three gastrocotylid genera share similar morphology and anatomy but are distinguished by this character: Pseudaxine Parona & Perugia, 1890 has no vagina, Allogastrocotyle Nasir & Fuentes Zambrano, 1983 has two vaginae, and Pseudaxinoides Lebedev, 1968 has multiple vaginae. In the course of a study of Pseudaxine trachuri Parona & Perugia 1890, we found specimens with structures resembling "multiple vaginae"; we compared them with specimens without vaginae in terms of both morphology and molecular characterisitics (COI barcode), and found that they belonged to the same species. We also investigated the male copulatory organ (MCO) of this species, the accuracy of the original description of which is known to be a matter of debate. We found that the genital atrium is armed with 12 hooks arranged as a single circle and a central hollow stylet which is probably involved in traumatic insemination. We redescribed Pseudaxine trachuri based on newly collected specimens from off the coast of Algeria and Museum specimens from off France. Specimens from the type-host, Trachurus trachurus, were found to be similar, for both molecular sequences and morphology, to those found on Boops boops. We can therefore confirm, for the first time with molecular evidence, that B. boops is a host of this parasite. We consider that Pseudaxinoides was erected on the basis of an erroneous interpretation of structures which are not vaginae and, consequently, propose the transfer of most of its species to Pseudaxine, as P. australis (Lebedev, 1968) n. comb., P. bychowskyi (Lebedev, 1977) n. comb., P. caballeroi (Lebedev, 1977) n. comb., P. cariacoensis (Nasir & Fuentes-Zambrano, 1983) n. comb., and P. vietnamensis (Lebedev, Parukhin & Roitman, 1970) n. comb. We also propose Allogastrocotyle dillonhargisorum nom. nov. for Pseudaxine bivaginalis Dillon & Hargis, 1965 to avoid a secondary homonymy.
虫体阴门的有无和数量是单殖吸虫系统分类的重要特征。三个胃腔科属具有相似的形态和解剖结构，但通过这一特征可以区分开来：假单殖目科属没有阴门，异胃腔科属有两个阴门，而拟单殖目科属有多个阴门。在对 1890 年的假单殖目 trachuri Parona & Perugia 进行研究的过程中，我们发现了一些具有类似“多个阴门”结构的标本；我们将这些标本与没有阴门的标本进行了形态和分子特征（COI 条码）比较，发现它们属于同一物种。我们还研究了该物种的雄性交配器官（MCO），其原始描述的准确性一直存在争议。我们发现，生殖腔室配备有 12 个排列成一个单独圆圈的钩子和一个中央空心的针状结构，可能参与创伤性授精。我们根据从阿尔及利亚沿海和法国博物馆收集的新标本重新描述了假单殖目 trachuri。从模式宿主黄鳍金枪鱼采集的标本在分子序列和形态上与在拟鲹属采集的标本相似。因此，我们可以首次通过分子证据证实，拟鲹属是该寄生虫的宿主。我们认为，拟单殖目科属是基于对不是阴门的结构的错误解释而设立的，因此建议将其大部分物种转移到假单殖目科属中，如 P. australis（Lebedev，1968）n. comb.，P. bychowskyi（Lebedev，1977）n. comb.，P. caballeroi（Lebedev，1977）n. comb.，P. cariacoensis（Nasir & Fuentes-Zambrano，1983）n. comb.和 P. vietnamensis（Lebedev，Parukhin & Roitman，1970）n. comb.。我们还建议将 Pseudaxine bivaginalis Dillon & Hargis，1965 更名为 Allogastrocotyle dillonhargisorum nom. nov.，以避免二次同名。
