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Michel Le Quément, c/o M. Pierre NoëlSPN et Département Milieux et Peuplements AquatiquesMuséum national d'Histoire naturelle43 rue BuffonCP 48, F-75231 Paris cedex 05pierre.noel [at] mnhn.fr
Cette squille est de taille moyenne ; elle peut atteindre 10 à 12 cm de long. Son corps est très allongé, aplati. L'œil est très mobile. La griffe de sa patte ravisseuse porte 5 dents, dent apicale comprise. Le telson a une carène médiane bien marquée ; il est très épineux. Les mâles sont beige moucheté ; les femelles ont en plus le centre du corps rose lorsqu'elles sont en vitellogenèse.
Détermination et espèces proches.
L'identification de l'espèce est moyennement difficile.
Période d'observation.
Les adultes de cette espèce s'observent toute l'année.
Biologie-éthologie.
La femelle tient ses œufs devant la bouche pendant l'incubation. Il y a neuf stades larvaires. Les larves sont planctoniques. La squille est un crustacé très agile qui vit dans un terrier en forme de"U". C'est un prédateur de petite faune vagile.
Écologie et distribution.
Cette squille se rencontre dans l'Atlantique européen des îles britanniques à la péninsule ibérique et dans toute la Méditerranée. Elle fréquente les herbiers de posidonies et d'autres phanérogames marines ainsi que divers sédiments sableux jusqu'à une centaine de mètres de profondeur.
P. Noël(UMS 2006 Patrimoine Naturel (AFB / CNRS / MNHN)),2016
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.
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