Mollusks

Banded Tree Snail

Banded Tree Snail, Orthalicus floridensis.
The banded tree snail is the largest of the Florida tree snails. This outgoing species has two to three spiral brown bands and one to four dark brown vertical growth lines on its shell. They can be found only in south Florida, from Big Pine Key in the south, northward to Chokoloskee Key on the west coast and Miami on the east coast. This area falls in Dade, Monroe, and Collier counties. Their range north of this area is restricted due to this species’ intolerance of cold weather.
Banded tree snails occupy dense, hardwood hammocks where they live on a variety of both native and introduced species of trees. There, they feed on algae, fungi, and lichens on bark and leaf surfaces. This species is no longer listed as threatened as of January 11, 2017. They are, however, part of the Imperiled Species Management Plan. This is due to the species’ limited range, loss of suitable habitat within that range, and threats from fire ants which can kill tree snails during hibernation.
Banded tree snails are hermaphrodites. This means they possess both male and female reproductive structures. The late summer rains trigger them to mate. Banded tree snails take 2 to 3 years to reach sexual maturity. They lay eggs in nests at the base of trees. These eggs are roughly pea-sized and will remain in the nest until the next rainy season when the young will hatch and move up into the trees.
Photo Credit: Andy Waldo
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Coffee Bean Snail

Coffee bean snails, Melampus Coffee, is a species of snail commonly found in the mangroves forests of Southwestern Florida. The Coffee Melampus is a land snail that uses specialized tissue to breathe air. However, this specialized tissue called a lung is different from the respiratory system found in vertebrate animals.
The shell is thick and its aperture has small serrations internally. Because of the shell’s color pattern and shape resembling a coffee bean, this species of snail became known as the Coffee Bean Snail.
The coffee bean snail feeds on decaying matter and plants. They also are a significant food source for a variety of species.
Photo Credit: Aymee Laurain
Author: Steven Marquez – Student, Valencia College
Work Cited:
Leal, John H., “The Coffee Melampus.” Bailey-Matthews National Shell
Museum Accessed 25 Nov 2021.
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Mangrove Periwinkle

The Mangrove Periwinkle
 
The Mangrove Periwinkle, Littoraria angulifera, has a small spiral shell that is commonly about 3 cm high (Hosein). Despite its colorful shell, this species of snail has a gray operculum. But its carapace is full of beautiful colors. The color pattern of the shell is a combination of green, orange, and yellow with black slanted markings. These markings decorate the shell from its opening to the top. Additionally, the 6 to 7 whorls that end in a pointed top give this snail an attractive look.
 
The mangrove periwinkle population spreads from South Florida to South America. They also inhabit the Caribbean Islands and spans in Africa from Senegal to Angola (Hosein). In these regions, the mangrove periwinkle, just like its name suggests, lives in mangrove areas. Here, juvenile periwinkles stay living near the tideline until they reach adulthood. After that, adult snails inhabit trunks, stems, roots, and leaves of mangroves trees.
 
The diet of this species consists of algae, fungi, and other plant materials, but this mollusk is also an important food source for various animals.
 
Works Cited: Hosein, Trent. “Littoraria Angulifera (Mangrove Periwinkle).” UWI: The Online Guide to the Animals of Trinidad and Tobago, 2015.
 
Photo Credit: Aymee Laurain
Author: Steven Marquez – Student, Valencia College
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