一种Didymozoidae(Trematoda:Hemiuroidea)的第一个中间宿主,一种双壳类动物,使用多基因座分子数据进行鉴定。第一个中间,(可能)第三个中间,和新的附睾类群的成年阶段(Saccularinamagnacetabulan.gen。n.sp.)从摩顿湾,昆士兰,澳大利亚是从悉尼猫科动物Anadararapezia(Deshayes)(Arcoidea:Arcidae)收集的,Sillagosp.(Sillaginidae)和夏威夷埃洛普斯里根(Elopiformes:Elopidae),分别,基因匹配。斜面杆菌的感染表现为孢子囊和囊状尾蚴,和被感染的组织在the的底部。形态学上,S.magnacetabula在雌雄同体的组合中相对于所有其他iddymozoids是独特的,配对,丝状体形,腹侧吸盘的存在,一个睾丸,和后肢的囊状排泄囊泡。生成了S.magnacetabula和其他42种推定的didymozoid物种的分子序列数据,以探索Didymozoidae和Hemiuroidea之间的关系。在28SrDNA区域的分子系统发育分析中,新属形成了一个进化枝,其中一个来自红喉皇帝的未描述的分类单元,Lethrinusminiatus(Bloch&Schneider)(Perciformes:Lethrinidae),从大堡礁,和另一个来自夏威夷大肠杆菌的无特征分类单元。这个进化枝是一个中等支持的进化枝的姐妹,该进化枝包括所有其他可用序列的双足类物种,包括目前公认的六个亚科中的五个的代表。在Hemiuroidea压倒性地使用腹足纲软体动物作为第一个中间宿主的背景下,讨论了双壳类动物对双壳类动物的感染。
The first first-intermediate host for a species of Didymozoidae (Trematoda:
Hemiuroidea), a bivalve of the family Arcidae, is identified using multi-loci molecular data. First intermediate, (likely) third intermediate, and adult stages of a new didymozoid taxon (Saccularina magnacetabula n. gen. n. sp.) from Moreton Bay, Queensland, Australia were collected from the Sydney cockle Anadara trapezia (Deshayes) (Arcoidea: Arcidae), Sillago sp. (Sillaginidae) and Elops hawaiensis Regan (Elopiformes: Elopidae), respectively, and genetically matched. Infections in A. trapezia were present as sporocysts and cystophorous cercariae, and infected tissue at the base of the gills. Morphologically, S. magnacetabula is distinctive relative to all other didymozoids in the combination of hermaphroditism, mate-pairing, filiform body shape, the presence of a ventral sucker, a single testis, and a saccular excretory vesicle at the posterior extremity. Molecular sequence data were generated for S. magnacetabula and 42 other putative didymozoid species to explore relationships within the Didymozoidae and
Hemiuroidea. In molecular phylogenetic analyses of the 28S rDNA region, the new genus forms a clade with an undescribed taxon from the redthroat emperor, Lethrinus miniatus (Bloch & Schneider) (Perciformes: Lethrinidae), from the Great Barrier Reef, and another uncharacterised taxon from E. hawaiensis. This clade is sister to a moderately well-supported clade comprising all other didymozoid species for which sequences are available, including representatives of five of the six presently recognised subfamilies. The infection of a bivalve by a didymozoid is discussed in the context of the overwhelming use of gastropod molluscs as first intermediate hosts by the
Hemiuroidea.