Thuridilla hoffae   Gosliner, 1995

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This species has been observed on Reunion, Mayotte and Madagascar Islands


Order : Sacoglossa
Superfamily : Plakobranchoidea
Family : Plakobranchidae
Distribution : Tropical western Pacific and Mayotte
Maximal size : 20 mm
Abundance :


Species characteristics :

There is bright orange-yellow line at the parapodial edge, followed by a thin line of blue-black to black and a diffuse broad light blue band (or a serie of blue to blue green patches) running parallel to the parapodial edge

The head and body are black to dark blue

The rhinopores are light blue except for the tip which is blue-black

thuridilla hoffae
Showing species characteristics...

Photo Christophe Cadet
Reunion, La Saline, less 1 m, 19 May 2010, size : 15 mm

See more about : Sightening and mating periods
   See more about : Thuridilla phylogeny by Gosliner 1995

Remarks :

Identification confirmed by Bill Rudman and Hsini Lin
    Synonymous : (according Worms)
               - No other name

Bibliographic data :

The anterior margin of the foot hasn't blue and orange lines
    A dorsal patch of blue also occurs on the posterior tip of the foot
    Ethymology : Is named for Patty Jo Hoff who together with Clay Carlson, first discovered this species.
     In external morphology, T hoffae most closely resembles to T. livida , but
            - T. livida has a distinct narrow iridescent blue submarginal line while T. hoffae has a series of iridescent blue to blue green patches or a diffuse broad light blue to blue green band.
            - T. livida has orange and blue lines on the anterior margin of the foot that are absent in T. hoffae
            - The general body color is darker in T. hoffae than in T. livida
    Comparative data of the five Thuridilla with black, orange and blue margin found in our area...

 

T. multimarginata

T. indopacifica

T. livida

T. hoffae

T. undula

Parapodial margin

Narrow white edge enlarged at regular intervals, then a narrow stripes of orange, black, pale blue, and black.

Thin brownish black edge, then a broad band of yellow-orange, and an irregular band of black. In the spaces between the blackish extensions are bright blue

Black edge followed by lines of orange, black and narrow iridescent blue

Bright yellow-orange edge, followed by a thin black line and a diffuse broad light blue to blue green band.

Broad burnt orange edge, followed by lines of black and vivid blue

Head

Opaque white pigment with sometimes orange marks

Blue with a centrally placed Y-shaped opaque white patch

Dark brown to black

Black to dark blue

Black and reflective blue pigment.

Rhinophores

They have opaque white pigment with sometimes orange marks
    The tips of the rhinophores are black

The base are whitish to pale blue. At the tips are bands of blue, black, orange-yellow and black.
   Not observed in our specimens

They are dark brown to black
    The apical half has opaque white pigment

They are light blue except for the tip which is dark-blue

The base are turquoise bluish green. At the middle are narrow bands of blue and black. The apex is orange

Body

Orange or light to dark green

Translucent green with scattered opaque white spots

Dark brown to black

Black to dark blue

Turquoise bluish green

Anterior margin of the foot

It has orange, black, blue and black lines

It has black, orange-yellow , black and blue bands

It has black, orange and blue lines .

It hasn't blue and orange lines

It has orange, black and blues bands.

References :

Bill Rudman Seaslug site : Sea Slug Forum : Thuridilla hoffae
   Nudipixel Thuridilla hoffae

Publications :

  Gosliner, T.M. (1995) The genus Thuridilla (Opisthobranchia: Elysiidae) from the tropical Indo-Pacific, with a revision of the phylogeny and systematics of the Elysiidae. Proceedings of the California Academy of Sciences, 49(1) : 1-54.
    Jensen, K.R. (2007). Biogeography of the Sacoglossa (Mollusca, Opisthobranchia). Bonner Zoologische Beiträge. 55: 255281.

Other photos of Thuridilla hoffae :


 

 

Marina Poddubetskaia

Mayotte, "Banc Laclochèterie", Handréma, 5 m, 11 November 2003, size : 10 mm

 

The head is black to dark blue

 

 


Fabrice Schubert

Mayotte, Sakouli, 5 m, 4 October 2009, size : 20 mm

A dorsal patch of blue (a) also occurs on the posterior tip of the foot


 

 

Alain-Benoît Rassat

Madagascar, Nosy bé, Charlie, 16 m, 17 January 2016, size : 20 mm

 

 

 


 More photos from Indian Ocean

See more about : Thuridilla phylogeny by Gosliner 1995