Lamellodiscus Johnston & Tiegs, 1922 Diagnosis: Eyes present (2 pairs). Vas deferens intercaecal or looping left intestinal caecum. MCO tubular, simple. Accessory piece present, articulated or non-articulated with MCO. Vaginal aperture marginal. Vaginal atrium sclerotized. Egg tetrahedral. Ventral and dorsal Lamellodiscs; intermediate lamellae incomplete partially fused [18] or free at midline. Superficial root of ventral anchor reduced. Parasites of marine and estuarine perciform fishes (Centracanthidae, Pomacanthidae, Serranidae and Sparidae). Type-species: L. typicus Johnston & Tiegs, 1922 from Acanthopagrus australis (Günther) (Sparidae). Other species: L. acanthopagri Roubal, 1981 from Acanthopagrus australis; L. baeri Oliver, 1974 from Pagrus pagrus Linnaeus (Sparidae); L. bidens Euzet, 1984 from Diplodus puntazzo (Cetti) (Sparidae); L. butcheri Byrnes, 1987 from Acanthopagrus australis, and Acanthopagrus butcheri (Munro); L. caballeroi Venkatanarsaiah & Kulkarni, 1980 from Crenidens crenidens (Forsskål) (Sparidae); L. cirruspiralis Byrnes, 1987 from Acanthopagrus berda (Forsskål), and Acanthopagrus latus (Houttuyn); L. corallinus Paperna, 1965 from Centropyge bispinosa (Günther) (Pomacanthidae), and Dascyllus marginatus (Rüppell) (Sparidae); L. coronatus Euzet & Oliver, 1966 from Diplodus cervinus cervinus (Lowe); L. dentexi Aljoshkina, 1984 from Dentex macrophthalmus (Bloch) (Sparidae); L. drummondi Euzet & Oliver, 1967 from Pagellus acarne (Risso) (Sparidae); L. elegans Bychowsky, 1957 from Acanthopagrus sivicolus Akazaki, Diplodus annularis (Linnaeus), Diplodus sargus cadenati de la Paz, Bauchot & Daget, Diplodus sargus sargus (Linnaeus), Diplodus vulgaris (Geoffroy Saint-Hilaire), Oblada melanura (Linnaeus) (Sparidae), and Spondyliosoma cantharus (Linnaeus) (Sparidae); L. epsilon Yamaguti, 1968 from Monotaxis sp. (Lethrinidae); L. ergensi Euzet & Oliver, 1966 from Diplodus annularis, Diplodus puntazzo, Diplodus sargus cadenati, Diplodus sargus sargus, and Diplodus vulgaris; L. erythrini Euzet & Oliver, 1967 from Pagellus erythrinus (Linnaeus); L. fraternus Bychowsky, 1957 from Diplodus annularis, and Diplodus vulgaris; L. furcillatus Kritsky, Jiménez-Ruiz & Sey, 2000 from Diplodus noct (Valenciennes); L. furcosus Euzet & Oliver, 1966 from Diplodus annularis, Diplodus sargus cadenati, and Diplodus sargus sargus; L. gracilis Euzet & Oliver, 1966 from Diplodus annularis, Diplodus sargus cadenati, Diplodus sargus sargus, Oblada melanura, and Spondyliosoma cantharus (Linnaeus); L. hilli Euzet, 1984 from Diplodus puntazzo; L. ignoratus Palombi, 1943 from Diplodus annularis, Diplodus puntazzo, Diplodus sargus cadenati, Diplodus sargus sargus, Diplodus vulgaris, Lithognathus mormyrus (Linnaeus) (Sparidae), Sarpa salpa (Linnaeus) (Sparidae), and Pagrus caeruleostictus (Valenciennes); L. impervius Euzet, 1984 from Diplodus puntazzo; L. indicus Tripathi, 1957 from Rhabdosargus sarba (Forsskål) (Sparidae); L. japonicus Ogawa & Egusa, 1978 from Acanthopagrus latus (Houttuyn), and Acanthopagrus schlegelii schlegelii (Bleeker); L. kechemirae Amine & Euzet, 2005 from Diplodus sargus sargus; L. knoepffleri Oliver, 1969 from Spondyliosoma cantharus, Spicara maena (Linnaeus) (Centracanthidae), Spicara smaris (Linnaeus); L. major Murray, 1931 from Acanthopagrus australis, Acanthopagrus berda, Acanthopagrus butcheri, and Acanthopagrus latus; L. mirandus Euzet & Oliver, 1966 from Diplodus sargus cadenati; L. mormyri Euzet & Oliver, 1967 from Lithognathus mormyrus; L. niedashui Li, Yan, Liu & Yu, 1995 from Acanthopagrus latus; L. obeliae Oliver, 1973 from Pagellus bogaraveo (Brünnich); L. pagrosomi Murray, 1931 from Acanthopagrus latus, Chrysophrys auratus, Epinephelus akaara (Temminck & Schelegel) (Serranidae), Epinephelus awoara (Temminck & Schlegel), Pagrus major (Temminck & Schlegel), Parargyrops edita Tanaka, and Sparus aurata Linnaeus; L. parisi Oliver, 1969 from Sarpa salpa; L. rastellus Neifar, Euzet & Oliver, 2004 from Pagrus auriga Valenciennes; L. sanfilippoi Amine, Neifar & Euzet, 2006 from Diplodus sargus sargus; L. sarculus Neifar, Euzet & Oliver, 2004 from Pagrus coeruleostictus; L. sigillatus Neifar, Euzet & Oliver, 2004 from Pagrus coeruleostictus; L. spari Zhukov, 1970 from Acanthopagrus australis, Acanthopagrus berda, Acanthopagrus butcheri, Acanthopagrus latus, and Acanthopagrus schlegelii; L. squamosus Roubal, 1981 from Acanthopagrus australis, Acanthopagrus berda, and Acanthopagrus latus; L. takitai Ogawa & Egusa, 1978 from Acanthopagrus schlegelii; L. tomentosus Amine & Euzet, 2005 from Diplodus vulgaris; L. vaginalis Byrnes, 1987 from Acanthopagrus australis, and Acanthopagrus butcheri; L. verberis Euzet & Oliver, 1967 from Lithognathus mormyrus; L. virgula Euzet & Oliver, 1967 from Pagellus acarne. Remarks: Kritsky et al. (2000) questioned the monophyly of Lamellodiscus based on the variable morphology of the sclerotized structures, which may not represent generic features, as originally proposed by Oliver (1987). In the molecular phylogeny of Desdevises (2001), Lamellodiscus spp. appear in two distinct clades and Furnestinia represents an internal taxon closely related to L. verberis and L. mormyri. Our cladistic hypothesis was not capable to identify synapomorphies for species of Lamellodiscus, as already suggested by Kritsky et al. (2000) and Desdevises (2001), and, thus, its monophyly is rejected. Lamellodiscus furcillatus shows the most basal position among the fragment of Lamellodiscus in the tricotomy with Telegamatrix and clade “G”, while Lamellodiscus mormyri and Furnestinia appear as a sister taxa in clade “G”, supported by the presence of the accessory piece articulated with the MCO. Despite the non-monophyly of Lamellodiscus, we decided to retain all species in the genus, without proposal of new taxonomic categories until a cladistic analysis within Lamellodiscus species is performed.

Published as part of Domingues, Marcus V. & Boeger, Walter A., 2008, Phylogeny and revision of Diplectanidae Monticelli, 1903 (Platyhelminthes: Monogenoidea), pp. 1-40 in Zootaxa 1698 on pages 18-19, DOI: 10.5281/zenodo.180750