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Cette crevette est filiforme et transparente. Sa longueur ne dépasse pas 12 mm. Son céphalothorax est fin et allongé dans sa partie antérieure qui constitue une sorte de "cou" pour l'animal; sa partie postérieure porte les appendices thoraciques, les maxillipèdes et trois paires de pattes locomotrices; les deux dernières paires de pattes sont absentes. Il n'y a pas de branchies. A l'avant de la carapace, le rostre est triangulaire, minuscule et pointé vers le haut. L'abdomen est fin et très allongé. Le dernier segment abdominal et le telson présentent un dimorphisme sexuel : chez le mâle, on note sous le 6e pléonite la présence de deux épines ventrales sensiblement de même taille et dirigées vers l'arrière, la postérieure étant nettement courbée en crochet, et on observe sous le telson une grosse bosse ventrale sub terminale. Le pédoncule oculaire est long et se termine par une cornée très dilatée.
Détermination et espèces proches.
L'identification de l'espèce est relativement simple.
Biologie-éthologie.
Les œufs peu nombreux (une centaine) sont collés à la base des péréiopodes postérieurs; ils donnent naissance à une larve nauplius, larve suivie de plusieurs autres stades (protozoés, zoés, mysis). La crevette épiplanctonique est phytophage au début de sa vie puis devient omnivore et carnivore ensuite. Elle serait bioluminescente.
Écologie et distribution.
Cette espèce est holoplanctonique et se rencontre davantage au large que près des côtes, et plutôt en surface (0 à -50 m) qu'en profondeur. Elle est cosmopolite dans les eaux chaudes. En Europe, elle est présente dans toute la Méditerranée, et sa limite nord se situerait dans le Golfe de Gascogne.
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.