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Discoplana malagasensis sp. nov., a new turbellarian (Platyhelminthes: Polycladida: Leptoplanidae) symbiotic in an ophiuroid (Echinodermata), with a cladistic analysis of the Discoplana/ Euplana species
Doignon, G.; Artois, T.; Deheyn, D. (2003). Discoplana malagasensis sp. nov., a new turbellarian (Platyhelminthes: Polycladida: Leptoplanidae) symbiotic in an ophiuroid (Echinodermata), with a cladistic analysis of the Discoplana/ Euplana species. Zool. Sci. 20: 357-369
In: Zoological Science. Zoological Society of Japan: Tokyo. ISSN 0289-0003, more
Peer reviewed article  

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Keywords
    Animal morphology; Animal reproductive organs; Biogeography; Cladistics; Identification keys; Marine invertebrates; New species; Symbionts; Synonymy; Taxonomy; Discoplana malagasensis Doignon, Artois & Deheyn, 2003 [WoRMS]; Ophiothrix purpurea von Martens, 1867 [WoRMS]; Ophiuroidea [WoRMS]; Polycladida [WoRMS]; Turbellaria [WoRMS]; ISEW, Papua New Guinea [Marine Regions]; Marine

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Abstract
    A new species of polyclad flatworm from Papua New Guinea is described. It is found symbiotic in the ophiuroid Ophiothrix purpurea von Martens, 1867 (Echinodermata: Ophiuroidea). Apparently it belongs to the taxon Discoplana Bock, 1913 and can be distinguished from the six previously described Discoplana species by its very short ejaculatory duct and a penial papilla covered with a penial sheath, but without any true sclerotised structures such as a stylet or spines. The cladistic analysis of the Discoplana/Euplana species, based on morphological features and including two outgroups, reveals that all species of Discoplana, except D. pacificola, form a monophyletic taxon, that is not a synonym of Euplana Girard, 1893. Therefore the name Discoplana is conserved and the new species will be described as Discoplana malagasensis sp. nov. A key for the Discoplana/Euplana group is provided. In this key the biogeographical distribution and possible synonyms are given.

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