Thuridilla gracilis (Yonow, Nathalie 2012)
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Ordo: Sacoglossa
Familia: Plakobranchidae
Genus: Thuridilla
Name
Thuridilla gracilis Risbec, 1928 – Wikispecies link – Pensoft Profile
- Thuridilla gracilis Yonow, Nathalie, 2012, ZooKeys 197: 1-1.
Description
Description. Several colour forms exist in the Indo-West Pacific under the names of bayeri Er. Marcus (1975) and ratna Er. Marcus (1975). Ernst Marcus (1975) named these two species in the same publication based on specimens from the Marshall and Palau Islands: his species were differentiated by the presence or absence of blue spots and the shapes of the radular teeth. As noted in the review by Gosliner (1995), the numerous photographs now available show an overlap in colour pattern; morphologically he thought they had very little to distinguish between them and synonymised ratna with bayeri. The pericardia of bayeri appear to be simpler than those of ratna, but Risbec does not describe or illustrate it for gracilis. The pericardia of these three specimens are illustrated for information, and are clearly variable (Fig. 5). The sizes of the teeth are also variable, with the range of the teeth of bayeri being slightly larger than that of ratna (measured from Jensen 1992 and Gosliner 1995). The form with blue spots is the more common in the Indian Ocean, although the form with orange margins is the only one recorded in Mayotte (http://seaslugs.free.fr/nudibranche/a_intro.htm). All the specimens listed above from the Maldives and the Seychelles had bright blue spots in life (Plate 18), and the Seychelles animals additionally had orange margins (Plate 19).
Taxon Treatment
- Yonow, Nathalie; 2012: Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda) ZooKeys, 197: 1-1. doi
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