D'une longueur inférieure à 5 mm, B. littoralis mesure moins de 2 mm une fois replié et est donc difficile à observer. Il possède un oeil noir de petite taille, des téguments granuleux et un telson semi-circulaire caractéristique, recouvrant les uropodes. Les antennes sont courtes, le flagelle réduit.
Détermination :
L'écologie (littorale), la granulation des tergites et la forme du telson permettent d'éliminer tout risque de confusion.
Période d'observation :
Espèce observable toute l'année mais probablement dérangée en été par la fréquentation et le ramassage des laisses de mer.
Biogéographie et écologie :
Buchnerillo littoralis est une espèce littorale halophile qui colonise les laisses de mer et notamment les banquettes d'amas de Posidonies, parfois sous les pierres en haut de plage. Outre quelques points du Sud-Est de la France et de la Corse, sa répartition est restreinte à l'Italie, Malte et les îles Egéennes et l'île de Madère.
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.
French Version
