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Gastropod: Snails
Christopher Thomason
University of Phoenix

A 19th century English Preacher named Charles Spurgeon (1834-1892) once said, “By perseverance, the snail reached the ark.” That is true with the gastropoda species, Latin for stomach foot. Gastropods have persevered throughout time, becoming one of the oldest surviving species with over 600 named species, over 200 hundred from fossil records stretching back to the late Cambrian period, which was centered in the Paleozoic Era, almost 500 million years ago. With all gastropods being unique and mostly fascinating, this paper will focus mainly on snails, briefly touching on what gastropods are and centering on why snails are evolutionary marvels and why a snails shell makes it a curious species.
What makes gastropods what they are are their unique body compositions and their classification as an invertebrate. Gastropods are commonly described as a slimy, squishy “bugs” accompanied with or without a shell. This is mostly true minus the bug part because gastropods are members of the Mollusca (mollusk) genus, which are classified as non-vertebrate animals. Other members of the mollusk family are squids, clams, mussels, and octopods. There are over 50,000 known species of gastropods, 35,000 or so of which make up a portion of land-dwelling gastropods like snails and slugs.
Snails in particular have evolved into marvelous organisms, creatures which still fascinate modern studies because of their unique structures and adaptability. Gastropods, snails in this instance, have three main body sections to consider in their evolutionary distinctiveness: their head, this is where their brain and sense organs are located, the visceral mass which contains their organs protected within the shell, and their foot which is the muscular and “slimy” part of the body mentioned previously. This uniqueness has given the snail a significant advantage, allowing it to live and survive in very diverse regions and environments, making it one of the world’s most versatile organisms. A very unique and noteworthy adaptation is that most land snails are hermaphrodites, having both male and female organs, all able to produce and lay clutches of eggs.
When it comes to snails, their shells are what set them apart from the other animals. To be called a snail, usually means that the organism, gastropod, can hide in its shell, completely covering its body. The shell, or exoskeleton, it hides in is usually coiled which allows for optimum muscle attachment and some scientists have concluded that the spiraling is used for other survival reasons. Some of these reasons include camouflage, thermoregulation, and protection from predators and the sun. Many land and aquatic snails have several markings and colors on their shells that suggest that the shell is blending into its environment. In certain aquatic species, vividly colored shells have been suggested to advertise that the snail may be poisonous or very harmful if attacked. A snails shell has allowed it to adapt to the average backyard garden to some of the harshest environments on earth like in deserts, mountain tops, underground, deep underwater, and even hydrothermal vents. Snails, unlike many gastropods, are unique because of their exoskeleton, or shell. This adaptation has allowed this species of gastropod to explore and survive in some of the worst places planet earth has conceived. With snails among the oldest living creatures on earth, it is of no surprise that they were able to evolve into self-relying, solitary beings, being able to defend, hunt, and in most cases, breed by themselves. In my opinion, the evolution of the snail, like every other gastropod, is one nature’s most creative and sophisticated advancements to date. Evolution kept what was great; the shell and the foot, improved it survival odds; lungs and male/female sex organs, and created a creature that is fitting of the times it lives in.

References
Bird, J. (June, 2007). Snails and there relatives. The wonders of the sea. Retrieved from: http://www.oceanicresearch.org/education/wonders/mollusk.html
Ridley, M. (2003). Adaptive explanation - why is the study of adaptation difficult? Evoluion, third edition. Retrieved from: http://www.blackwellpublishing.com/ridley/tutorials/Adaptive_explanation9.asp
Wikipedia (December, 2011). The anatomy of a common air-breathing land snail. Anatomy, illustration. Retrieved from: http://en.wikipedia.org/wiki/Gastropods#The_shell

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