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Marioniopsis sp. 01  Genus: Odhner, 1934

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Marioniopsis sp. 01 is an unidentified or undescribed species of the genus Marioniopsis, or possibly of the genus Marionia. I label it Marioniopsis sp. 01, to distinguish it from other species of Marioniopsis.
Bill Rudman writes on this species: "This is the one I have previously called Tritoniid sp. 3. I think Odhner would have put it in a genus Marionopsis rather than Marionia but the first task is to sort out the species names of these tropical tritoniids."
Marioniopsis sp. 01 is characterized by a reticulate pattern of dark blue lines forming polygons on the pinkish-red body, and by bright blue spots. The sheaths of the rhinophores are of the same colour as the body, including the dark blue lines and spots, with whitish spicules at the margin, the rhinophores are basally pinkish with turquoise apices. The stalks of the gills are whitish-pink with minute dark blue spots, the gills are translucent turquoise.
Pretty similar are:
Marioniopsis sp. 02 which differs by the reddish background colour, by the translucent rhinophores with white tips, by the translucent gills with minute dark spots, and by the diffuse white longitudinal median band,
Marioniopsis sp. 03 which differs by very faint, almost lacking dark blue blue lines,
Marioniopsis sp. 04 which differs by the reddish background colour, by the series of median tan patches, by tan rhinophores, and by translucent tan gills .
Marioniopsis sp. 05 which differs by the reddish background colour, by the series of median dark grey patches, by tan rhinophores, and by translucent tan gills.
There are many tritoniids with a similar colour pattern, even the bright blue spots and the dark blue lines forming polygons are not distinctive - or there is one species with many colour variants.
This species was posted on 5 October 2003 at these websites as Marioniopsis sp. A  Genus: Odhner, 1934, and on 15 October 2011changed into
Marioniopsis sp. 01  Genus: Odhner, 1934.
For some genera, was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
More informations on Marioniopsis sp. 01 as Tritoniid sp. 3 are at Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 18 March 2017, Marioniopsis sp. 01  Genus: Odhner, 1934
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Marioniopsis_sp_01.htm