Sphincterochila zonata zonata | |
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Drawing of the shell of Sphincterochila zonata zonata. | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Heterobranchia |
Order: | Stylommatophora |
Family: | Sphincterochilidae |
Genus: | Sphincterochila |
Species: | |
Subspecies: | S. z. zonata |
Trinomial name | |
Sphincterochila zonata zonata (Bourguignat, 1853) | |
Synonyms | |
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Sphincterochila zonata zonata is a subspecies of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Sphincterochilidae. [1]
This species lives in deserts in Israel and Egypt.
Helix boissieri is the type species of the genus Sphincterochila . The type species was subsequently designated by Henry Augustus Pilsbry in 1895. [2] It is named after botanist Pierre Edmond Boissier.
Sphincterochila zonata zonata lives in the Negev desert [3] (Israel), and the Sinai desert in the Sinai Peninsula (Egypt). [4]
Shell is cretaceous, white; consists of five convex whorls and a deflected ultimate whorl. The aperture is thickened, projecting internally in two subconcrescent denticles (described by Tryon as "tubercles").
The average diameter of the shell is 25 mm. [5]
The average body mass of Sphincterochila zonata zonata is around 4.3 g. [3] Such mass is approximately divided in an even manner between the shell itself and the animal's soft parts. Schmidt-Nielsen et al., in 1971, [6] found that 56% of the animal's body mass was contained in its shell. About 80 to 90% of the mass of the soft body parts is composed of water (according to the Yom-Tov 1970). [3] On average, soft body parts contain 81% of water (nearly 1400 mg of water), 11% of proteins, 4% of ash, and little other organic matter. [6] Sphincterochila zonata zonata has no energy reserves and the amount of lipids it contains is a fraction of 1%, which is considered to be extremely low. [6]
Sphincterochila zonata zonata lives in desert environments. This snail is common in areas with loess-limestone soils, and uncommon in areas that have a flint substrate. [6]
Yom-Tov measured the maximum demographic density for Sphincterochila zonata zonata, encountering a value of 0.2-0.3 specimens/m2 in the area of the Negev desert he investigated in 1970. [3] The snail Xerocrassa seetzeni was found to be more abundant there. On the other hand, in the Northern Negev area investigated by Steinberger et al. In 1981 [7] Sphincterochila zonata zonata was the most abundant snail. [4]
Sphincterochila zonata zonata along with other snail species and algae are the most significant faunal and floral components of the Negev and Sinai deserts ecosystems. [4]
This species presents adaptations to arid conditions which significantly improve its desiccation tolerance. Some of those adaptations include a thick shell and a relatively reduced aperture [8] (see also Machin 1967), a thick epiphragm, and slow body surface heat conduction. About 90% of its shell surface reflects the visible portion of the solar spectrum, and much over 90% of the solar spectrum itself. [6] Sphincterochila zonata zonata also produces a new epiphragm after every period of activity [9] (see also Yom-Tov 1971).
These snails dig themselves into the soil to depths from 1 to 5 cm while they aestivate during summer in the Negev Desert. [3] In the vicinity of the Dead Sea, they usually either burrow to depths of up to 10 cm, or aestivate hidden under stones. [6]
All dormant snails of this species can resist ambient temperatures up to 50 °C, but temperatures of 55 °C and above are usually lethal. [6] The soft parts of the animal's body shelter inside the second and the third whorl of its shell, where the temperature can reach up to 50.3 °C. Temperatures of up to 56.2 °C were measured and are known to occur inside the shell's body whorl, which is mostly filled with air during aestivation. [6]
Dormant snails experience water loss of 0.5 mg per day per snail in summer, with a very low oxygen consumption rate. [6] For these reasons, dormant Sphincterochila zonata zonata can survive severe droughts for several years. [6] [10]
Sphincterochila zonata zonata is active for a few days only after rainfall [4] during the winter season, from November to March. At this time of the year they feed, mate, [6] and lay eggs. [4] Thus these snails are active for only 5-7% of the year (nearly 18 to 26 days), and aestivate during all the rest of the time. [4]
Dormant snails are known to have survived in museum collections for up to 6 years. [6] Schmidt-Nielsen et al. in 1971 [6] estimated their life span according to their oxygen consumption as being nearly 8 years.
Sphincterochila zonata zonata feeds on soil, especially loess mud after rains, [6] lichens, soil algae [3] and surface of limestone directly. [6] It does not eat higher plants. [6]
The known predators of Sphincterochila zonata zonata are rodents, namely the Cairo Spiny Mouse ( Acomys cahirinus ), Wagner's Gerbil ( Dipodillus dasyurus ) and the Asian Garden Dormouse ( Eliomys melanurus ). [3]
Aestivation is a state of animal dormancy, similar to hibernation, although taking place in the summer rather than the winter. Aestivation is characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. It takes place during times of heat and dryness, which are often the summer months.
Euchondrus is a genus of very small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Enidae.
The Arabian wolf is a subspecies of gray wolf native to the Arabian Peninsula—to the west of Bahrain, as well as Oman, southern Saudi Arabia, and Yemen. They are also found in Israel’s Negev and Arava Deserts, Jordan, Palestine, and Egypt's Sinai Peninsula. It is the smallest Gray wolf subspecies, and a specialized xerocole (arid-adapted) animal that normally lives in smaller familial packs. Arabian wolves are omnivorous and opportunistic eaters; they consume small to medium-sized prey, from insects, reptiles and birds to rodents and small ungulates, such as young Nubian ibex and several species of gazelle.
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An epiphragm is a temporary structure which can be created by many species of shelled, air-breathing land snails, terrestrial pulmonate gastropod mollusks. It can also be created by freshwater snails when temporary pools dry up.
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Eobania vermiculata also known as Helix vermiculata, common name the "chocolate-band snail" is a species of large, air-breathing, land snail, a terrestrial pulmonate gastropod mollusk in the family Helicidae, the true snails or typical snails.
Sphincterochila is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Sphincterochilidae.
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Xerocrassa simulata is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Geomitridae. It is endemic to southern Spain, specifically adapted to dry Mediterranean climates. Like other land snails, it undergoes a life cycle that includes egg laying, hatching of juveniles, shell development, and reproductive maturity as adults. These snails play a crucial role in their ecosystem by recycling nutrients and serving as prey for various predators, highlighting their ecological significance in their native habitat.
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Sphincterochila zonata is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Sphincterochilidae.
This article incorporates public domain text from the reference. [5]