The Maltese freshwater crab (''Potamon fluviatile lanfrancoi'') is a subspecies of
freshwater crab
Around 1,300 species of freshwater crabs are distributed throughout the tropics and subtropics, divided among eight family (biology), families. They show direct development and maternal care of a small number of offspring, in contrast to marine c ...
,
endemic
Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...
to certain areas within the
Maltese Islands
The geography of Malta is dominated by water. Malta is an archipelago of coralline limestone, located in Europe, in the Mediterranean Sea, 81 kilometres south of Sicily, Italy,From Żebbuġ in Malta, coordinates: 36°04'48.2"N 14°15'06.7"E to Ca ...
. It is very rare and its numbers have been decreasing in recent years.
General features
The Maltese freshwater crab (known as the ' in
Maltese
Maltese may refer to:
* Someone or something of, from, or related to Malta
* Maltese alphabet
* Maltese cuisine
* Maltese culture
* Maltese language, the Semitic language spoken by Maltese people
* Maltese people, people from Malta or of Maltese ...
) is a
decapod
The Decapoda or decapods, from Ancient Greek δεκάς (''dekás''), meaning "ten", and πούς (''poús''), meaning "foot", is a large order of crustaceans within the class Malacostraca, and includes crabs, lobsters, crayfish, shrimp, and p ...
(a
crustacean
Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthrop ...
with 10 legs). It can grow up to in width. It is greenish-grey with some occasional orange-yellow patches, and an overall purple hue on the legs.
Habitat
The Maltese freshwater crab is found where
fresh water
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salt (chemistry), salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include ...
/ running water is present throughout the year although it does live near pools and springs too. It is found in , , Għajn Żejtuna in Mellieħa and San Martin in
Malta
Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...
and in Valley in
Gozo
Gozo ( ), known in classical antiquity, antiquity as Gaulos, is an island in the Malta#The Maltese archipelago, Maltese archipelago in the Mediterranean Sea. The island is part of the Republic of Malta. After the Malta Island, island of Malta ...
.
When threatened, the crab takes shelter by hiding under rocks or stones in the water and among vegetation, or by entering the burrows it digs. These burrows are dug in mud or clay and can be more than 50 cm deep. Part of the burrow is normally flooded.
Food
The Maltese freshwater crab is
carnivorous
A carnivore , or meat-eater (Latin, ''caro'', genitive ''carnis'', meaning meat or "flesh" and ''vorare'' meaning "to devour"), is an animal or plant whose nutrition and energy requirements are met by consumption of animal tissues (mainly mu ...
and feeds on other smaller animals such as
tadpole
A tadpole or polliwog (also spelled pollywog) is the Larva, larval stage in the biological life cycle of an amphibian. Most tadpoles are fully Aquatic animal, aquatic, though some species of amphibians have tadpoles that are terrestrial animal, ...
s. It usually feeds after sunset.
Population
The numbers of this freshwater crab are steadily declining as a result of
pollution
Pollution is the introduction of contaminants into the natural environment that cause harm. Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollutants, the component ...
of water, drying up of
streams
A stream is a continuous body of surface water flowing within the bed and banks of a channel. Depending on its location or certain characteristics, a stream may be referred to by a variety of local or regional names. Long, large stream ...
and because of its capture by humans.
See also
*
Endemic Maltese wildlife The Maltese Islands, although small in area (316 km2), host many endemic species. This may make the organism endangered. These endemic species are important to the Maltese Islands because they form part of Maltese national heritage and are topi ...
References
SCIBERRAS, A., SCIBERRAS, J. & VELLA, S. (2009
On the Occurrence of a New Population of Potamon Fluviatile Lanfrancoi at Wied Ghajn Zejtuna,Mellieħa The Central Mediterranean Naturalist 5(1)24-27. Nature Trust Malta publications
SCIBERRAS, A. & SCIBERRAS, J. (2010) An Ecological Survey On The Valley Of Wied Għajn Żejtuna. Commissioned by Ghaqda tar-Residenti ta’ Santa Marija Estate. 42pgs
{{Taxonbar, from=Q6744847
Potamoidea
Freshwater crustaceans of Europe
Fauna of Malta
Endemic fauna of Malta