sheet no. 2279Flowering plantBroadleaf seagrass
Halophila stipulacea
Observed underwater
Marine non-indigenous species (NIS)
Launched in early 2025 within Les Amis de BioObs, the ALIEN PACA project runs a participatory watch on the arrival and presence of non-indigenous species in the Provence-Alpes-Côte d’Azur region, including the Principality of Monaco. It aims to become part of a wider regional network bringing several partners together.


All the species of the network in a printable document, to take diving or along the shore: photo, name, group, number of observations in the network and tick boxes.
Showing 39 species (of 39)
sheet no. 2279Flowering plantHalophila stipulacea
Observed underwater
Nanozostera japonica
On foot · Underwater
sheet no. 2168AlgaeAcinetospora crinita
Observed underwater
sheet no. 3039AlgaeAntithamnionella spirographidis
On foot · Underwater
sheet no. 111AlgaeAsparagopsis armata
On foot · Underwater
sheet no. 112AlgaeAsparagopsis taxiformis
Observed underwater
sheet no. 133AlgaeCaulerpa cylindracea
On foot · Underwater
sheet no. 134AlgaeCaulerpa taxifolia
Observed underwater
sheet no. 2277AlgaeLophocladia lallemandii /trichoclados
On foot · Underwater
sheet no. 4090AlgaeRugulopteryx okamurae
On foot · Underwater
sheet no. 1199WormsFicopomatus enigmaticus
On foot · Underwater
sheet no. 1336WormsHermodice carunculata
On foot · Underwater
sheet no. 1753MolluscsAplysia dactylomela
Observed underwater
sheet no. 1258MolluscsArcuatula senhousia
On foot · Underwater
sheet no. 2375MolluscsBrachidontes pharaonis
On foot · Underwater
sheet no. 1217MolluscsBursatella leachii
Observed underwater
sheet no. 319MolluscsCrepidula fornicata
On foot · Underwater
sheet no. 4587MolluscsLamprohaminoea ovalis
On foot · Underwater
sheet no. 2471MolluscsRapana venosa
On foot · Underwater
sheet no. 1204LophophorataBugula neritina
On foot · Underwater
sheet no. 3267ArthropodsAustrominius modestus
On foot · Underwater
sheet no. 433ArthropodsCallinectes sapidus
On foot · Underwater
sheet no. 3216ArthropodsEriocheir sinensis
On foot · Underwater
sheet no. 995ArthropodsHemigrapsus sanguineus
On foot · Underwater
sheet no. 442ArthropodsPercnon gibbesi
Observed underwater
sheet no. 5427ArthropodsPortunus segnis
Observed underwater
sheet no. 4597ArthropodsRhithropanopeus harrisii
On foot · Underwater
sheet no. 658ProchordataAscidiella aspersa
On foot · Underwater
sheet no. 3170ProchordataCiona robusta
Observed underwater
sheet no. 479ProchordataClavelina lepadiformis
On foot · Underwater
sheet no. 2948ProchordataClavelina oblonga
On foot · Underwater
sheet no. 1203ProchordataStyela clava
On foot · Underwater
sheet no. 668ProchordataStyela plicata
Observed underwater
sheet no. 572VertebratesFistularia commersonii
Observed underwater
sheet no. 2793VertebratesKyphosus sectatrix
Observed underwater
sheet no. 2466VertebratesLagocephalus sceleratus
Observed underwater
sheet no. 3106VertebratesPterois miles
Observed underwater
sheet no. 550VertebratesSiganus luridus
Observed underwater
sheet no. 1260VertebratesSiganus rivulatus
Observed underwater
While scuba diving, snorkelling, freediving or on foot along the shore and the strandline.
A photo, even an imperfect one, lets the validator confirm the identification.
In my BioObs logbook: species, habitat, date and place.
A question about an identification? Write to us.
To date, the list of non-indigenous species of the PACA region takes up those of the ALIEN Corsica and ALIEN Occitania networks.
Better understanding potentially invasive species and controlling their spread: this is the goal BioObs works towards alongside its regional partners.
Read the definition on the OPEN participatory science portal (in French) (opens in a new tab)