Thank you for your contribution to the improvement of the INPN. The information submitted has been sent to an expert for verification and correction.
To get the picture, please visit:
Jean Lecomte, 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
Legend:
Vue latérale d'une sivade blanche, au large de Banyuls-sur-mer, Pyrénées-orientales, profondeur -500 m, 23 juin 1975.
La sivade blanche mesure habituellement jusqu'à 50 à 80 mm de longueur totale.
Diagnose :
Le rostre est minuscule ; il a la forme d'une épine plate redressée. Tous les péréiopodes ont des exopodites. Les deux premiers sont longs et effilés ; ils portent diverses épines et ils sont terminés par une pince dont le bord coupant des doigts est pectiné. L'abdomen ne présente pas de carène dorsale. Le 6e segment abdominal est toujours plus long que le telson. Sur le vivant, l'animal est blanc translucide avec quelques chromatophores roses ou rouges sur le bord inférieur du péréion ainsi que sur les segments abdominaux ; le bout des pinces et l'extrémité des uropodes est souvent rougeâtre.
Biologie-ethologie :
L'espèce se trouve au large mais pas très loin des côtes vers 200 à 600 m de profondeur le jour ; elle remonte près de la surface la nuit. La reproduction a lieu toute l'année. La fécondité est faible avec une centaine d'oeufs à chaque ponte. Les principaux prédateurs sont des poissons, des crustacés et des céphalopodes.
Biogéographique et écologie :
L'espèce est relativement commune dans l'Atlantique Nord oriental, Méditerranée incluse.
P. Noël(UMS 2006 Patrimoine Naturel (AFB / CNRS / MNHN)),2015
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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