Facultad de Ciencias, Universidad Autónoma de Baja California, Carretera Transpeninsular 3917, Fraccionamiento Playitas, Ensenada, Baja California, 22860, México.
Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Carretera Transpeninsular, 3917, Fraccionamiento Playitas, Ensenada, Baja California, 22860, México.
Parasitol Res. 2022 Sep;121(9):2651-2660. doi: 10.1007/s00436-022-07590-9. Epub 2022 Jul 9.
Immature trematodes of Lecithochirium sp. are recorded for the first time as parasites of the California two-spot octopus Octopus bimaculatus from Bahía de los Ángeles, Baja California, Mexico. Thirty-nine O. bimaculatus were examined for trematodes and a total of 100 immature specimens of Lecithochirium sp. were recorded from the crop of seven infected octopuses. Based on these records, O. bimaculatus may act as a second intermediate or paratenic host for these parasites. Partial sequences of the 28S (region D1-D3) ribosomal gene corroborate the identifications based on morphological characters. DNA sequences of the 28S gene from GenBank were analyzed to include the immature samples of Lecithochirium sp. within a hemiurid phylogenetic framework. All immature specimens of Lecithochirium sp. were recovered as monophyletic and Pulmovermis cyanovitellosus was identified as the sister species of Lecithochirium sp. However, due to the lack of molecular data for species of the genus Lecithochirium, these phylogenetic inferences must be taken with caution. Therefore, the morphological and molecular data obtained here provide a foundation for future work to develop a systematic comparison among- and within-species of the genus Lecithochirium. Additionally, the present records of Lecithochirium in O. bimaculus add to the knowledge of the parasite fauna of cephalopods.
首次记录到 Lecithochirium sp. 的未成熟吸虫寄生在来自墨西哥下加利福尼亚州巴哈伊亚德洛斯安赫莱斯的加利福尼亚双斑章鱼 Octopus bimaculatus 体内。对 39 只 O. bimaculatus 进行了吸虫检查，从 7 只受感染章鱼的胃中总共记录到了 100 个 Lecithochirium sp. 的未成熟标本。根据这些记录，O. bimaculatus 可能是这些寄生虫的第二中间宿主或副宿主。28S（区域 D1-D3）核糖体基因的部分序列证实了基于形态特征的鉴定。从 GenBank 中分析了 28S 基因的 DNA 序列，以将 Lecithochirium sp. 的未成熟样本纳入半尾目系统发育框架内。所有 Lecithochirium sp. 的未成熟标本均被回收为单系群，并且鉴定出 Pulmovermis cyanovitellosus 是 Lecithochirium sp. 的姐妹种。然而，由于缺乏 Lecithochirium 属物种的分子数据，这些系统发育推断必须谨慎对待。因此，这里获得的形态和分子数据为未来开展 Lecithochirium 属内和种间系统比较的工作提供了基础。此外，本研究中在 O. bimaculus 中记录到 Lecithochirium 增加了头足类寄生虫动物区系的知识。
