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首页> 外文期刊>Journal of Parasitology >A NEW SPECIES OF AURICULOSTOMA (DIGENEA: ALLOCREADIIDAE) IN THE MEXICAN TETRA ASTYANAX MEXICANUS (ACTINOPTERYGII: CHARACIDAE) FROM CENTRAL VERACRUZ, MEXICO, DESCRIBED WITH THE USE OF MORPHOLOGICAL AND MOLECULAR DATA
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A NEW SPECIES OF AURICULOSTOMA (DIGENEA: ALLOCREADIIDAE) IN THE MEXICAN TETRA ASTYANAX MEXICANUS (ACTINOPTERYGII: CHARACIDAE) FROM CENTRAL VERACRUZ, MEXICO, DESCRIBED WITH THE USE OF MORPHOLOGICAL AND MOLECULAR DATA

机译：来自形态分布和分子数据的墨西哥中部韦拉克鲁斯州墨西哥四叶天牛新物种（天牛：Allocreadiidae）的新种

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摘要

Auriculostoma totonacapanensis n. sp. is described from the Mexican tetra, Astyanax mexicanus (Actinopterygii, Characidae) collected in a tributary creek of the Bobos River in Filipinas, Veracruz, Mexico. The new species is set apart from all congeners by the combination of some morphological characters such as the testes position (oblique in most specimens), the ventral to oral sucker ratio (1:1.2 x 1:1.1), the cirrus sac originating at the ovarian region, and by having vitelline follicles not confluent in the posttesticular region. Auriculostoma totonacapanensis n. sp. closely resembles Auriculostoma platense (Szidat, 1954) Scholz, Aguirre-Macedo, and Choudhury, 2004 and Auriculostoma diagonale Curran, Tkach and Overstreet, 2011 by possessing oblique testes; however, it differs from both species by possessing a genital pore located at level of the cecal bifurcation and by having vitelline follicles extending anteriorly up to the cecal bifurcation level, instead of a genital pore located between the anterior margin of the ventral sucker and cecal bifurcation, and vitelline follicles extending anteriorly to the mid level of the esophagus as in A. platense or to the pharynx level as in A. diagonale. Additionally, the new species differs from A. diagonale by having vitelline follicles not confluent or scarcely confluent in the posttesticular region rather than extensively confluent. Scanning electron microscopy micrographs of the new species demonstrated the presence of a single pair of muscular lobes on either side of the oral sucker, with a broad base, stretching from the ventrolateral to the dorsolateral side. Maximum parsimony and Bayesian inference analyses of the 28S rRNA gene sequences placed A. totonacapanensis as sister species of Auriculostoma astyanace Scholz, Aguirre-Macedo, and Choudhury, 2004. Nucleotide variation between A. totonacapanensis and A. astyanace was 2.0% and 3.6% for the 28S rRNA gene and ITS2 sequences, respectively. Sequence variation for the 28S rRNA gene between Auriculostoma spp. and 7 other genera of Allocreadiidae ranged from 2.4 to 6.3%.
机译：托纳潘潘木耳sp。从墨西哥四叶草（Astyanax mexicanus）（Actinopterygii，Characidae）中收集到，描述于墨西哥韦拉克鲁斯州菲律宾的波波斯河支流小河中。通过结合一些形态特征（例如，睾丸位置（大多数标本中是倾斜的），腹侧与口腔的吸盘比率（1：1.2 x 1：1.1），卷囊起源于其他物种），将新物种与所有同类动物区分开。卵巢区域，并且卵黄质卵泡在睾丸后区域不汇合。托纳潘潘木耳sp。拥有倾斜的睾丸，非常类似于白斑木耳（Szidat，1954年），Scholz，Aguirre-Macedo和Choudhury，2004年和对角木耳，Curran，Tkach和Overstreet，2011年。然而，它与两个物种的不同之处在于，其生殖器孔位于盲肠分叉处，卵黄质卵囊向前延伸至盲肠分叉处，而不是位于腹侧吸盘前缘和盲肠分叉之间的生殖孔卵形卵泡向前延伸至食道中段（如桔梗）或咽部水平（如对角线虫）。此外，新物种不同于对角线虫，卵黄质卵泡在睾丸后区域不汇合或几乎不汇合，而不是广泛汇合。新物种的扫描电子显微镜显微照片表明，在口腔吸盘的每一侧均存在一对成对的肌肉裂片，基部较宽，从腹侧向背外侧延伸。对28S rRNA基因序列的最大简约和贝叶斯推论分析使Totonacapanensis作为Austculostoma astyanace Scholz，Aguirre-Macedo和Choudhury的姊妹物种，2004年。Totonacapanensis和A. astyanace的核苷酸差异分别为2.0％和3.6％ 28S rRNA基因和ITS2序列。 Auriculostoma spp之间的28S rRNA基因的序列变异。其余7个属的Allocreadiidae占2.4％至6.3％。

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