Lobotrema Tripathi, 1959

Domingues, Marcus V. & Boeger, Walter A., 2008, Phylogeny and revision of Diplectanidae Monticelli, 1903 (Platyhelminthes: Monogenoidea), Zootaxa 1698, pp. 1-40 : 26

Lobotrema Tripathi, 1959

Synonymy: Pseudomurraytrema Yamaguti, 1958 pre-occuped, Allomurraytrema Yamaguti, 1963

Diagnosis: Tegument smooth or scaled. Genital pore opening posterior to male copulatory organ (MCO). Genital atrium muscular. Vas deferens intercaecal or looping left intestinal caecum. MCO tubular, composed of 2 nested tubes; external tube uniform. Accessory piece absent. Prostatic reservoir separated into three zones. Accessory copulatory organ present. Vaginal atrium sclerotized [47]. Vaginal aperture marginal. Accessory adhesive organ absent [45]. Two haptoral bars [46]. Superficial root of ventral anchor reduced. Parasites of freshwater and marine Perciformes , Cypriniformes and Pleuronectiformes .

Type species: L. madrasi Tripathi, 1959 from Brachirus orientalis (Bloch & Schneider) (Soleidae) .

Other species: L. argyrosomi ( Bychowsky & Nagibina, 1977) Oliver, 1987 from Pennahia macrocephalus (Tang) ; L. aspidopariaii Gupta & Varsha Sachdeva, 1987 from Aspidoparia morar (Hamilton) (Cyprinidae) ; L. caballeroi Gupta & Sharma, 1982 from Cynoglossus arel ; L. kumari Oliver, 1987 from Johnius coitor (Hamilton) ; L. rajendrai Srivastava & Kumar, 1983 from Garra gotyla gotyla (Gray) (Cyprinidae) ; L. sciaenae ( Bychowsky & Nagibina, 1977) Oliver, 1987 from Johnius dussumieri (Cuvier) ; L. spari ( Yamaguti, 1958) Oliver, 1987 from Acanthopagrus schlegelii schlegelii , Acanthopagrus australis , Acanthopagrus berda , Acanthopagrus butcheri , and Acanthopagrus latus ; L. youngi Gupta & Sharma, 1982 from Pseudorhombus triocellatus (Bloch & Schneider) (Paralichthyidae) .

Remarks: Lobotrema has occupied different taxonomic positions since it was proposed by Tripathi (1959): in Tetraonchinae ( Dactylogyridae ) ( Tripathi, 1959), Ancyrocephalinae ( Dactylogyridae ) ( Yamaguti, 1963), and Murraytrematoidinae ( Oliver, 1982). Yamaguti (1958) proposed Pseudomurraytrema spari , posteriorly transferred to Allomurraytrema (see Yamaguti, 1963). Bychowsky and Nagibina (1977) considered Allomurraytrema as a junior synonymy of Lobotrema , a decision corroborated by Oliver (1982, 1987).

In the present cladistic analysis, Lobotrema appears as sister species of Murraytrema and Diplectanum aequans , within Diplectaninae, as indicated by the sharing of accessory copulatory organ [44] and prostatic reservoir separated into three zones [43]. Bychowsky and Nagibina (1977) suggested that these three taxa are closely related, which is corroborated herein. Lobotrema can be differentiated from these two genera for the absence of the ventral bar [46].