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Cette espèce mesure jusqu'à 15-25 cm, exceptionnellement 40 cm. Elle possède cinq bras (rarement 6 ou 7) ; ces derniers sont flexibles, longs et presque cylindriques et leur extrémité est arrondie. Il y a une petite constriction caractéristique au départ de chaque bras. Le disque central est petit. Le tégument présente une fine granulation homogène. La couleur est due à des pigments caroténoïdes ; la livrée est unie, plus rarement avec des taches, et de couleur violacée, rose, orange ou rouge ; les tubes ambulacraires sont jaunes.
Détermination et espèces proches.
L'identification de l'espèce est relativement simple. Une confusion est toutefois possible avec l'étoile de mer lisse Hacelia attenuata ou l'étoile de mer rouge Echinaster sepositus.
Période d’observation.
Les adultes de cette espèce s'observent toute l'année.
Biologie-éthologie.
L'espèce est un prédateur de bivalves. Sa biologie de la reproduction et sa longévité sont mal connues.
Écologie et distribution.
O. ophidianus se rencontre jusqu'à un centaine de mètres de profondeur dans des habitats variés : posidonies, algues photophiles, coralligène, fonds rocheux. Elle est présente dans toute la Méditeranée et dans l'Atlantique africain. Elle est peu commune sur les côtes méditerranénnes françaises où elle est en limite nord de distribution.
Interactions avec les activités humaines.
L'espèce est réglementée ; elle est potentiellement intéressante pour l'aquariologie marine.
P. Noël(UMS 2006 Patrimoine Naturel (AFB / CNRS / MNHN)),2017
The map presents a summary at the 10 x 10 km grid of the observation data for the species transmitted to the SINP. These data have been subjected to validation filters.
Distribution map from the Atlas of Departmental Biodiversity and Marine Sectors program
Current distribution in metropolitan France
The map presents a reference distribution layer of the species at the scale of departments and marine sectors. The presence and absence data were established by expertise within a network of partners. This reference distribution is used in the validation process of the SINP data at the INPN level.
Distribution map from the Atlas of Departmental Biodiversity and Marine Sectors program
Certain presence
Corresponds to a report on the basis of at least one observation proved within a period of 10 years (20 years for little-known invertebrates) preceding the year and no presumption of extinction since obtaining the last data nor doubt on reproductive and implemented nature of this population. For migratory species, the presence indicated concerns areas of reproduction.
Probable presence
This status is based on one or more of the following criteria:
search of species incomplete but presence of supportive environments;
ecology of the species consistent with the hypothesis of his presence;
the last reliable sighting is older than 10 years compared to the reference date, no recent specific research and no presumption of extinction from that date [vertebrates, invertebrates and plants well studied (rhopalocera, grasshoppers, dragonflies ...)] ;
the last reliable observation being older than 20 years, no recent specific research and no presumption of extinction from that date [poorly known taxa: fungus, many invertebrates...].
Probable or certain absence
This point covers the absence, more difficult by nature to demonstrate than presence. This status is based on one or more of the following criteria:
intensive but unsuccessful targeted research;
lack of adequate environments;
unobserved species while its presence is easily detected;
unlikely presence for historical or biogeographical reasons.
This status must be assigned to a department in which the presence of the species is casual.
Absence due to a proven extinction
Particular case of absence due to a proven extinction less than a half century ago (older disappearances are treated as "no probable or definite").
No information
In the state of knowledge, we can not comment on the presence or absence in the current department. This is the default status when not comprised in one of the previous categories or whenever there is doubt.