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
Summary18
Bibliography19
INTRODUCTION
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
Sea cucumbers and roly-polys may look like that have nothing in common. But they do! Roly-polys and sea cucumbers both have defences that protect them. Just like how the roly-poly rolls up in a ball. Even though they may be different kinds have defences they still both protect themselves from
Around the mouth of the octopus are eight arms. The eight arms allow the octopus to move, crawl, and swim around in its habitat. Octopuses crawl slowly, walking on its arms to move through the water headfirst with the arms trailing behind. When necessary, octopuses can move fast using their arms to propel it through the water similar to jet propulsion. The suckers found
This sea creature can actually turn inside out to protect itself from being hunted: Eel/ Sea Cucumber
Do you feel the US has regained/ recovered its innocence in the eyes of the world since the 60’s or not? Are things better or worse today? Did we lose our innocence temporarily or permanently and why?
Echinoderms such as starfish, sea cucumbers, and urchins are identified by their symmetry and central mouth. This species is found decorating the coral reefs by their variety of color and sizes. Because some of these animals like to burrow in the sand, they can supply oxygen to some of the depths in the ocean. Echinoderms are a staple food in many sea animals diet.
What does it eat? It primarily feeds on algae. Its spines and tube feet help it to grab food.
One of the most mystifying creatures of the deep blue sea, the cuttlefish is not a fish it is some squid-like mollusks. The cuttlefish has a large out stretched body with its mouth being surrounded by tentacles, giving it the nickname head-footed. Cuttlefish around the world varies from sizes of 15cm to 60cm and weigh from the range of 6lb to 23lb. This creature is found throughout the warm tropical shallows of the ocean to the cold depths of the deep ocean.in order for the cuttlefish to survive they are able to change their body color and they body texture to blend in with different marine environments, while being prey upon dolphin, sharks, seals, cuttlefish, and other big fish. The cuttlefish uses its ability of changing colors to hide itself
Crayfish: In our dissection of the crayfish we found that it used gills instead of lungs, like the clam. Its gills allow an exchange of carbon dioxide for oxygen. Much like the worm, the crayfish has segments that split its body into several parts. Crayfish segments often become fused, so parts of the crayfish may be multiple parts. Much like a skeleton the crayfish has a hard exoskeleton. The structures it uses to capture its prey or securing and eating food are its chelipeds, mandibles, maxillae, and maxillipeds. Rows of chitinous teeth line its stomach to help further break down its food.
Acorn Barnacles are sessile (fixed to one place) as they are permanently fixed to the rocks. This means that Acorn Barnacles cannot move from place to place to hunt for food, hence why they filer-feed. A structural adaptation that the barnacles have that allow them to feed are specially adapted cirri (legs) that filter organic matter from the water. When the tide comes in, a muscle opens the plates at the top of the Acorn Barnacle’s shell. The barnacle then repeatedly waves its long feather-like legs (cirri) which have hairs that sifts the water, collecting plankton and other food particles that are suspended in the water, before transferring them to the mouth for the barnacle to eat. Because of this Acorn Barnacles need
With the separation of the Crinoids into four distinct criteria depending on the stalk length which is primarily classified as the most important factor in classifying the marine organisms. Based on the length of the stalk, the marine epifaunal filter feeding crinoid species were compared based on the stalk length and fan density. Important features of the crinoids have evolved due to the adaptations to different habitats which encourage the crinoids to utilize and evolved different ecological factors, including their feeding characteristics. Through general analysis, collecting data of the crinoid characteristics such as, the environment, the physical functions, fan shape, and Gut contents the crinoids were observed and compared to find the
Each day, giant larvaceans create a filmy membrane up to a meter across that encases the creature. By beating their tail, the larvaceans then pump ocean water into the membrane, which acts as a filter that catches nutrients in the water that the larvaceans can eat. When the membrane gets too clogged, the larvaceans discard it, and it quickly sinks to the ocean floor, carrying carbon with it. Because of the speed at which the mucus sinks, the carbon-containing pellets of animal excrement bypass animals and drops to depths that hold carbon for long expanses of time. As Sari Giering, a
The Age of Innocence by Edith Wharton is a book that gave the word “love” many other meanings, such as impossible, meaningless and incomplete. There were many unbearable obstacles that Countess Ellen Olenska, one of the main characters, had to face because of love. She was treated badly by many people and always longed for love but never obtained it. With everyone cursing her, betraying her and hurting her, there was one person who was always there for her. Newland Archer wasn’t only sympathetic towards her; he also began to fall in love with her. The love she always wanted. He was the man who truly cared for her and always helped her make decisions. Out of all the selfish people in New York who
Plankton, also known as drifters is a type of organisms that that drifts or floats with ocean currents. It includes organisms such as, protozoa, algae, larval forms of animals, and bacteria. Plankton can be categorized based on the styles of feeding. There are many types of plankton, which includes phytoplankton, zooplankton, and bacterioplankton. A real-life example of phytoplankton is diatoms, and they are responsible of “recycling” sunlight and carbon dioxide in order to “offer” oxygen to the world. They also have adaptations that allow them to float in water, and they will form long chains that are connected by silica spines in order to help them not sink to the bottom. They also build glass greenhouse out of silica for protection. Nekton,
Cnidarians (or coelenterates), including sea anemones, jellyfish, and corals, are built mostly of sheets of cells, and they exploit the large surface area of the
From my recent work with Prof. Fernando Siringan (marine geologist), I have gained skills in deep diving and in piloting a submersible for surveying depths up to 200 meters. During my graduate research with Prof. Annette Juinio-Meñez (invertebrate ecologist), I have studied the biodiversity, distribution, behavior and taxonomy of shallow-water sea cucumbers. Although my sites were species-rich, populations were critically low due to unregulated fishing. Through these, I have become adept at finding and distinguishing species based on morphological characters (e.g. microscopic