Thuridilla cf. bayeri (Er. Marcus, 1965) [Elysia]

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Thuridilla bayeri (Er. Marcus, 1965) [Elysia] and Thuridilla ratna (Er. Marcus, 1965) [Elysia] were thought to be synonyms
of Thuridilla gracilis (Risbec, 1928) [Elysia]. Martín-Hervás et al. (2021) reerected them as valid species. Thuridilla bayeri (Er. Marcus, 1965) [Elysia] is part of the Thuridilla gracilis species complex.
Let me quote the redescripton of Thuridilla bayeri in Martín-Hervás et al. (2021):
"Overall colouration dark brown to black, with fine cream to yellow longitudinal lines on the head and parapodia (Fig. 12a). Elongated body. Edge of parapodia lined with a red-orange band interspersed with black dashes, giving the impression of a row of blackorange spots. Around 8–10 bright blue ovoid spots submarginally between the yellow lines along the length of each parapodium, whereas on the rest of the parapodia, irregular whitish-grey spots inserting between the cream longitudinal lines of the body in the mantle. Anterior portion of the foot with light blue spots (Fig. 12c). A mid-dorsal blue mark in the head, another one smaller between the rhinophores and two blue patches on each side of the head, behind the pedal lobes. Oral and pedal lobes with orange colouration. Rhinophores smooth with same colour as the general body and cream longitudinal lines. Lines expanded and united into a transverse white band, followed in some specimens, by an orange band at the tips with white streaks."
Very similar is Thuridilla sp. 8 in Martín-Hervás et al. (2021) the above pictures #1 and #2 are most likely this species, because according to
Martín-Hervás et al. (2021) has Thuridilla bayeri not yet been reported from the Phillipines, I posted them on 6 September 2021
as Thuridilla cf. bayeri (Er. Marcus, 1965) [Elysia].
cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Thuridilla bayeri or perhaps something closely related, or at least similar in appearance.
Martín-Hervás, M. D. R.; Carmona, L.; Malaquias, M. A. E.; Krug, P. J.; Gosliner, T. M.; Cervera, J. L. (2021). A molecular phylogeny of Thuridilla Bergh, 1872 sea slugs (Gastropoda, Sacoglossa) reveals a case of flamboyant and cryptic radiation in the marine realm.
Cladistics. DOI: 10.1111/cla.12465., available online at https://doi.org/10.1111/cla.12465 page(s): figs 11-14
How to cite:
Köhler, E. (2021), published 21 October 2021, Thuridilla cf. bayeri (Er. Marcus, 1965)
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Thuridilla_bayeri_cf.htm


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