Boudaya Lobna, Neifar Lassad, Euzet Louis
Laboratoire de Biodiversité et Ecosystèmes Aquatiques, Faculté des Sciences de Sfax, Sfax, Tunisia.
Syst Parasitol. 2009 Oct;74(2):149-59. doi: 10.1007/s11230-009-9213-7. Epub 2009 Sep 4.
Species of Lamellodiscus Johnston & Tiegs, 1922 are described from the gills of Lithognathus mormyrus (Linnaeus) in the Mediterranean Sea. A new nomenclature for a male copulatory organ with two articulated pieces is proposed: the hollow piece is referred to as the penis and we propose the term 'vectis' for the entirely sclerotised piece. It is shown that L. verberis Euzet & Oliver, 1967 actually comprised two species, L. verberis (sensu stricto), which is redescribed based on both the type-material and new material from the type-locality off Sète (France) and from off Sfax (Tunisia), and L. flagellatus n. sp. The two species are distinguished by the shape of the male copulatory organ and vagina (penis lacking a thread-like extension and vaginal duct short in L. verberis, versus penis with a thread-like extension and vaginal duct long in L. flagellatus); the vectis is similar in both species. Access to new material of L. mormyri Euzet & Oliver, 1967 from the same host species also enabled a redescription of this species. The status of L. ignoratus Palombi, 1943, another species from Lithognathus mormyrus, is discussed. A possible scenario for the synxenic speciation of these congeneric parasites of L. mormyrus is proposed.
1922年约翰斯顿（Johnston）和蒂格斯（Tiegs）描述的鳞盘虫属（Lamellodiscus）物种来自地中海的莫氏石首鱼（Lithognathus mormyrus，即林奈所定物种）的鳃。针对一种具有两个关节相连部分的雄性交配器官提出了新的命名法：中空部分被称为阴茎，而我们将完全硬化的部分称为“操纵杆”。研究表明，1967年欧泽（Euzet）和奥利弗（Oliver）描述的颤鳞盘虫（L. verberis）实际上包含两个物种，即狭义的颤鳞盘虫（L. verberis (sensu stricto)），基于模式标本以及来自法国塞特附近模式产地和突尼斯斯法克斯附近的新材料对其进行了重新描述，还有新物种鞭状鳞盘虫（L. flagellatus）。这两个物种通过雄性交配器官和阴道的形状来区分（颤鳞盘虫的阴茎没有丝状延伸且阴道管短，而鞭状鳞盘虫的阴茎有丝状延伸且阴道管长）；两种物种的操纵杆相似。获得来自同一宿主物种的1967年欧泽和奥利弗描述的莫氏鳞盘虫（L. mormyri）的新材料也使得能够对该物种进行重新描述。讨论了1943年帕洛姆比（Palombi）描述的来自莫氏石首鱼的另一个物种——隐匿鳞盘虫（L. ignoratus）的分类地位。提出了这些莫氏石首鱼同属寄生虫的共栖物种形成的一种可能情形。
