Tambja ceutae

Tambja ceutae Garcia-Gomez & Ortea, 1988

Tambja ceutae by Sergio López González

Taxonomy
 

Superdomain

Biota  

 

Kingdom

Animalia  

 

Phylum

Mollusca  

 

Class

Gastropoda  

 

Subclass

Heterobranchia  

 

Infraclass

Euthyneura  

 

Subterclass

Ringipleura  

 

Superorder

Nudipleura  

 

Order

Nudibranchia  

 

Suborder

Doridina  

 

Infraorder

Doridoidei  

 

Superfamily

Polyceroidea  

 

Family

Polyceridae  

 

Subfamily

Nembrothinae  

 

Genus

Tambja  

 

Species

Tambja ceutae  García-Gómez & Ortea, 1988

 
 Classification according to Bouchet et al. (2017)
Taxonomic source: World Register of Marine Species (AphiaID: 140050).
Description
Average sized species, the specimens found usually measure about 20 mm and reach a maximum size of about 80 mm (Ortea et al., 1996). It has a limaciform shaped body and it is coloured blue-green, darker in the older specimens. The head is broad compared to the body and is provided with a series of prominences at the edge of the notum and other similar bumps on the sides behind the eye areas. On the back of the caudal region other similar bumps can be seen. The edge of the notum is crossed by a yellow band that is interrupted in the rear side; in the middle area of ​​the back there is another yellow band that runs along its length to the gill opening -which does not surround- and follows behind it to the tail. Two additional yellow lines flank the mid-dorsal stripe from the gills to the rhinophores, interrupted in the dark blue eye areas. Elongated yellow dots appear on the tail, which appear to be the fragmented continuation of the two yellow lines that run along the sides of the animal. It has short and dorsoventrally flattened oral tentacles, with the back coloured dark blue. The rhinophores are dark blue, have 20 dark blue lamellae and have a split apex. The rhinophoric sheath, which has a smooth, yellow rim, is raised above the surface of the notum and has a short yellow line separating it from the notum’s edge. The gill crown consists of five tripinnate and non-retractile leaves, which surround the anal papilla. The three anterior leaves are more developed than the two lateral ones and  have yellow coloured gill raquis, but a wedge of dark blue color on the tip. The inner border of the gills rachis is also yellow, and they converge around the anal papilla, where they delimit a blue stain. The foot is bordered with a yellow line near the margin. The genital orifice is on the right side, flanked by two yellow lines that run above and below it. All the yellow lines of the body (sometimes they can be of a greenish hue) appear surrounded of dark blue color. The mentioned bumps have a blue-green coloured apex and a conical shape, growing on the yellow lines. There is a specialised sensory organ characteristic to species of Tambja located on each side of the head between rhinophore and oral tentacle. This sensory organ is usually seen as a closed and almost unobservable horizontal slit, but with patience it can be seen in the open position, exposing the internal lamellae to the environment. These lamellae are in some respects analogous to the rhinophores’ lamellae, being connected to the same nerves, however just exactly what they are assessing and analysing is currently unknown. The literature has not even settled upon a accepted name for it, but scientific papers name this organ “sensory pit”, “pre-rhinophoral sensory organ”, “lappet” and “lateral slot”.

Biology
It lives in the shady areas of the rocky bottoms. Juvenile specimens live usually under stones. It is assumed that it feeds on briozoans of the genus Bugula, since it usually lays the spawn in the base of this bryozoan colony. The spawn is an orange ribbon wrapped helically, with orange eggs of about 93-107 microns in diameter, arranged irregularly, not forming layers or columns. Spawn has only been observed between December and March in the Canary Islands. It is supposed to be a prey to the nudibranch Tyrannodoris europaea, from which it escapes with swimming movements. The coloration is very variable, but it is very likely due to the presence of several similar species [crypsis] (Debelius & Kuiter, 2007). It is able to secrete “tambjamine”, a compound with cytotoxic and antimicrobial activity.

Etymology

  • Ceutae. From the city of Ceuta (Spain)

Distribution
Its current distribution includes the southern coast of the Iberian Peninsula (Ocaña et al., 2004), the north coast of Morocco (García Gómez & Ortea 1988 in Ceuta), Canary Islands (Caballer et al., 2001), Azores (Wirtz, 2006, 2014) and Madeira (Caballer et al., 2001). It has also been found in the waters of Ibiza, Balearic Islands (Cesare Fattori, 2014 pers. comm.).

Known georeferenced records of the species: Tambja ceutae
Sources:
: OBIS
: GROC 2010-2011
: Enric Madrenas
: João Pedro Silva
: Bernard Picton
: GBIF.ORG
: OPK
: VIMAR
: Manuel Ballesteros.
: M@re Nostrum
: Altres fonts
: Marine Regions

Abundance

    Western Mediterranean:1 out of 5 stars
    Eastern Mediterranean:1 out of 5 stars
    Atlantic Ocean:1 out of 5 stars
Month

This chart displays the monthly observation probability for Tambja ceutae based on our own records.

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More pictures

Bibliography

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Further reading

Cite this article as:

Pontes, Miquel, Manuel Ballesteros, Enric Madrenas (2012-2019) "Tambja ceutae" in OPK-Opistobranquis, Published: 15/10/2013, Accessed: 20/08/2019 at (https://opistobranquis.info/en/0AatK)

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