The Age of Innocence: Analysis

2897 Words Sep 26th, 2011 12 Pages
Introduction to the Sea Cucumber5
Internal Anatomy Diagram 6
External Anatomy Diagram 6
Classification of the Sea Cucumber8
Ecosystem and Habitat10
Digestive and Excretory Systems11
Circulatory System13
Reproductive System13
Nervous System15
Unique Characteristics of the Sea Cucumber16
Sea Cucumber at Research17

The Sea Cucumber is an Echinoderm (Phylum Echinodermata) and is also an Invertebrate. Sea Cucumbers belong to the family “Holothuroidea”. There are approximately 1,150 described species of Sea Cucumber of which most are marine and distributed worldwide. Genus Pseudocolochirus are among the most poisonous Sea Cucumbers in the World.

The most important feature distinguishing
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Some of them position themselves in the direction of the currents in order to catch food that flows by, with their open tentacles. At other times, sea cucumbers may use their tentacles to sift through the sediments on the bottom floor.

The sea cucumber has a very primitive digestive system. It has a pharynx that lies behind the mouth, surrounded by a ring of ten calcareous plates. For some sea cucumbers, this makes up only a substantial part of their skeleton, and forms the point of attachment for muscles that can retract the tentacles into the body for safety and for the main muscles that are part of the body wall. Many species of the sea cucumbers have an oesophagus and a stomach, but for others, the pharynx opens directly into the intestine, and therefore, lacks these structures. The intestine is usually long and coiled, and is looped through the body at least three times before in end in a cloacal chamber, or in some species, directly as the anus.

When it feeds, the sea cucumber will extend its tentacles, covered with sticky mucus, into the water until food particles cover the tentacles. The sea cucumber is a suspension feeder; therefore, it takes in small bits of detritus and microscopic organisms that float near the sea bottom. They are
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