African Amphibian Conservation Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa.
South African Institute for Aquatic Biodiversity, Grahamstown, 6140, South Africa.
Acta Parasitol. 2021 Dec;66(4):1204-1211. doi: 10.1007/s11686-021-00389-1. Epub 2021 Apr 18.
Pseudocapillaria (Ichthyocapillaria) bumpi n. sp. (Nematoda: Capillariidae) is described from specimens infecting the digestive tract of the West African lungfish, Protopterus annectens (Owen) (Lepidosireniformes: Protopteridae).
Nematodes were collected in Karingani Game Reserve, Southern Mozambique and studied using light microscopy; obtained sequences of the 18S ribosomal (18S rRNA) gene used for phylogenetic studies.
The new species is assigned to Pseudocapillaria Freitas, 1959 by having a stichosome consisting of a single row of stichocytes and ventrolateral lobes on the male tail as well as by lacking spines on the specular sheath, caudal alae, a membranous caudal bursa, and a lateral expansion of the caudal end. It is also assigned to the sub-genus Ichthyocapillaria Moravec, 1982 by having a membrane between the ventrolateral lobes and by lacking a vulvar appendage. Pseudocapillaria (I.) bumpi n. sp. differs from its nominal congeners by having a comparatively large body size with relatively long spicule, bearing the thin membrane non-extending further than ventrolateral lobes in males and relatively smaller eggs without protruding polar plugs. It is the 20th species of the genus, the first from the Afrotropical Realm, and the first from any lungfish species. Phylogenetic analyses suggested that P. (I.) bumpi is deeply nested in a clade that associates species of the genera Pearsonema, Aonchotheca and Baruscapillaria.
本文描述了一种从感染西非肺鱼（Protopterus annectens（Owen））消化道的标本中分离出的伪毛首线虫（Ichthyocapillaria）bumpi n. sp.（Nematoda：Capillariidae）。
在莫桑比克南部的卡兰加尼野生动物保护区采集线虫标本，并用光学显微镜进行研究；获得的 18S 核糖体（18S rRNA）基因序列用于系统发育研究。
新种属于伪毛首线虫属（Freitas，1959），其雄虫尾部具有由单个列的纹细胞和腹外侧叶组成的侧索，并且缺乏镜像鞘、尾翼、膜状尾囊和尾部末端的侧向扩张上的刺，此外，它还属于 Ichthyocapillaria 亚属（Moravec，1982），因为其腹外侧叶之间有一层膜，并且缺乏外阴附属物。Pseudocapillaria (I.) bumpi n. sp. 与它的同名词种不同，具有相对较大的体型和相对较长的刺，在雄虫中，薄膜不延伸到腹外侧叶之外，并且卵相对较小，没有突出的极栓。这是该属的第 20 个种，也是第一个来自非洲热带地区的种，也是第一个来自任何肺鱼物种的种。系统发育分析表明，P. (I.) bumpi 是一个深嵌在一个分支中的物种，该分支与 Pearsonema、Aonchotheca 和 Baruscapillaria 属的物种相关联。
