Arion fasciatus | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Heterobranchia |
Order: | Stylommatophora |
Family: | Arionidae |
Genus: | Arion |
Species: | A. fasciatus |
Binomial name | |
Arion fasciatus | |
Arion fasciatus, also known by its common name the Orange-banded Arion, is a species of air-breathing, completely shell-less, land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the round-back slugs. The species was first described by Sven Nilsson in 1823.
Arion fasciatus is originally from Northern Europe, but it has spread to other cool, wet climates, including the British Isles, Canada and the Northern United States. The species was presumably first brought across the Atlantic Ocean during the colonial era. These slugs are generally found in ecotonal habitats. [2]
Arion fasciatus is in many ways similar to most other stylommatophoran slugs. They are hermaphroditic. They have a head, mantle, and foot. There are two sets of retractable tentacles on their heads: the upper pair have light-sensing organs, and the lower two are used to smell. These slugs have a mantle that covers much of the top of the first third of the body, with its pneumostome located on the front right portion of the mantle. On the lower part of the head, the mouth and radula are situated. The orange banded arion has a darkened stripe that extends along the entire body and mantle length on both sides of the body, and is gray, off-white, or tan, with a very light-colored foot.
Arion fasciatus is about six centimeters in length when moving, secreting a clear mucus which is also left behind it and visible as a trail. However, when disturbed, the mucus becomes denser and stickier. A study found that this thicker mucus can prevent predation by Carabid beetles, but that this special mucus becomes exhausted after three minutes of stimulation. It then takes up to a day to get mucus production up to pre-attack levels, leaving the slug susceptible to other predators. [3]
Although the orange-banded arion will eat fresh vegetable matter, a study on the eating habits of Arion fasciatus found that it does not find fresh leaves as palatable as old dead leaves, likely because these slugs generally feed under the leaf litter layer.
This study also found that the diet of the orange-banded arion is variable throughout the year. For example, there is an increase in animal material eaten during May and June. The hypothesis is that during the colder months, slugs don't move around much under the leaf litter, and take in a lot of leaves where the chlorophyll has already broken down, but during the warmer months, they take advantage of dead earthworms and small arthropods, both of which have high mortality rates. [4]
The original description of the three slugs in the subgenus Carinarion, Arion (Carinarion) fasciatus, Arion (Carinarion) silvaticus and Arion (Carinarion) circumscriptus was based on small differences in body pigmentation and details of the genital anatomy. A recent study of these morphospecies (typological species) claims that previous studies had shown that body colour in these slugs may be influenced by their diet, and the genital differences were not confirmed by subsequent multivariate morphometric analyses. Analysis of alloenzyme and albumen gland proteins had given conflicting results. Also that evidence of interspecific hybridization in places where these predominantly self-fertilizing slugs apparently outcross contradicted their status as biological species. Molecular studies led to the conclusion that the three members of Carinarion are a single species-level taxon. [5] The name Arion fasciatus has priority.
The North American least shrew is one of the smallest mammals, growing to be only up to 3 inches long. It has a long pointed snout and a tail never more than twice the length of its hind foot. The dense fur coat is either grayish-brown or reddish-brown with a white belly. Its fur becomes lighter in the summer and darker in the winter. Although similar in appearance to several species of rodents, all shrews are members of the order Eulipotyphla and should not be mistaken for a member of the order Rodentia. The North American least shrew's eyes are small and its ears are completely concealed within its short fur, giving it very poor eyesight and hearing.
Limax maximus, known by the common names great grey slug and leopard slug, is a species of slug in the family Limacidae, the keeled slugs. It is among the largest keeled slugs, Limax cinereoniger being the largest.
The red slug, also known as the large red slug, chocolate arion and European red slug, is a species of land slug in the family Arionidae, the roundback slugs.
The black slug, Arion ater, is a large terrestrial gastropod mollusk in the family Arionidae, the round back slugs. Many land slugs lack external shells, having a vestigial shell. Most slugs retain a remnant of their shell, which is usually internalized, unlike other terrestrial mollusks which have external shells. Without such shells, slugs produce mucus, that may also contain toxins—to deter predators. Terrestrial slugs produce two other forms of mucus that facilitate locomotion and prevent death from drying. Such mollusks are hermaphroditic. Slugs most often function as decomposers but are also often omnivores. Arion ater is one such slug, decomposing organic matter, preying on other organisms, and consuming vegetative matter including agricultural crops. Native to Europe, the black slug is an invasive species in Australia, Canada, and the United States.
The common death adder is a species of death adder native to Australia. It is one of the most venomous land snakes in Australia and globally. While it remains widespread, it is facing increased threat from the ongoing Australian cane toad invasion.
Arion is a genus of air-breathing land slugs in the family Arionidae, the roundback slugs. Most species of this Palearctic genus are native to the Iberian Peninsula.
Arion fuscus, also known as the "dusky arion", is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the roundback slugs.
Arion distinctus is a species of air-breathing land slug in the family Arionidae, sometimes known as the roundback slugs. It is a terrestrial pulmonate gastropod mollusc. Several vernacular names exist, but it is unclear if they are much in use: brown soil slug, common garden slug, darkface arion, Mabille's orange-soled slug, April slug.
Deroceras reticulatum, common names the "grey field slug", "grey garden slug", and "milky slug", is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusc in the family Agriolimacidae. This species is an important agricultural pest.
The Kerry slug or Kerry spotted slug is a species of terrestrial, pulmonate, gastropod mollusc. It is a medium-to-large sized, air-breathing land slug in the family of roundback slugs, Arionidae.
A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. Land snail is the common name for terrestrial gastropod mollusks that have shells. However, it is not always easy to say which species are terrestrial, because some are more or less amphibious between land and fresh water, and others are relatively amphibious between land and salt water.
Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc. The word slug is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a small internal shell, particularly sea slugs and semi-slugs.
Arion circumscriptus, common name brown-banded arion, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae. It is commonest in woodland, occurring across most of Europe, except for more southern regions, and is also widespread in North America. It has been argued that A. circumscriptus is best considered a colour morph of Arion fasciatus.
Arion silvaticus is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae.
Arion hortensis, also known by its common name the "garden slug", "small striped slug" or "black field slug" is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the roundback slugs.
The reproductive system of gastropods varies greatly from one group to another within this very large and diverse taxonomic class of animals. Their reproductive strategies also vary greatly, see mating of gastropods.
Geomalacus malagensis is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusc in the family Arionidae, the round back slugs.
Coleomegilla maculata, commonly known as the spotted lady beetle, pink spotted lady beetle or twelve-spotted lady beetle, is a large coccinellid beetle native to North America. The adults and larvae feed primarily on aphids and the species has been used as a biological control agent. Based on name connotation and to avoid confusion with other species also called "spotted ladybeetle", spotted pink ladybeetle is probably the most appropriate common name for this species.
The mating of gastropods is a vast and varied topic, because the taxonomic class Gastropoda is very large and diverse, a group comprising sea snails and sea slugs, freshwater snails and land snails and slugs. Gastropods are second only to the class Insecta in terms of total number of species. Some gastropods have separate sexes, others are hermaphroditic. Some hermaphroditic groups have simultaneous hermaphroditism, whereas some sequential hermaphroditism. In addition, numerous very different mating strategies are used within different taxa.
Aglaja tricolorata is a species of sea slug, an opisthobranch gastropod mollusc in the family Aglajidae. It is native to the Mediterranean Sea and the tropical eastern Atlantic Ocean where it lives in shallow water on the sandy seabed.