The Biology of the Venom of Hapalochlaena maculosa
Hapalochlaena maculosa, commonly known as the blue-ringed octopus, is a golf ball-sized cephalopod inhabiting the waters around Tasmania and southeastern Australia with a highly potent neurotoxin that it uses as a predatory and defensive mechanism. H. maculosa does not actually synthesize its venom, but rather, the neurotoxin (known as maculotoxin) is produced by a bacterial symbiont of the octopus that lives in its salivary glands. While not overly aggressive, H. maculosa has been known to bite humans when they disturb the usually reclusive octopus. Tetrodotoxin (TTX), the principle component of maculotoxin, inhibits the nervous system by binding to sodium channels on nerve cells to prevent the flow of sodium and release of neurotransmitters. Recent findings have shown that there are sodium channel variants that are either immune or resistant to tetrodotoxin. In most humans, however, victims of the blue-ringed octopus’s neurotoxin will enter into increasingly dangerous stages of paralysis, which will often end in death of the victim without medical assistance. Sustained medical care for the duration of the toxin’s effects will improve the likelihood of a victim’s survival, but mortality rates are still staggeringly high despite current medical efforts and attempts to find an antidote.
Introduction
Australia is home to many of the most venomous animals in the world. Many people know that the bites from many of Australia’s snakes and spiders or the stings from its jellyfish and scorpions can be lethal, and oftentimes images of a person writhing in agony as a toxin courses through his or her body come to mind. However, one of Australia’s deadliest creatures has a toxin that works in a very different way. The venom of Hapalochlaena maculosa, or the blue-ringed octopus, causes relatively little pain, but its effects are much more terrifying for the victim. This venom, known as maculotoxin, is an unusual venom both in how it has come to be the weapon of the blue-ringed octopus and in how it works.
Physical Biology
H. maculosa is a member of Class Cephalopoda and Family Octopodidae. The octopus is made up of a main body, or head, in which there is a well-developed brain, a mouth region that houses the beak, and a pair of eyes. Surrounding the mouth are eight or ten tentacles which are lined with suckers. Within the mantle cavity are the visceral organs, including the venom apparatus (Halstead et al.
“Taxonomically speaking, a lobster is a marine crustacean of the family Homaridae, characterized by five pairs of jointed legs, the first pair terminating in large pincerish claws used for subduing prey…. Moreover, a crustacean is an aquatic arthropod of the class Crustacea, which comprises of crabs, shrimp, barnacles, lobsters, and freshwater crayfish” (Wallace, 55). This is an example of Logos since the author uses scientific facts to convey the message he wants to communicate in an objective way. Wallace also uses logos as a persuasive device by presenting facts on the science of the lobster’s neurological system and its ability to feel pain. The Maine Lobster Promotion Council states “The nervous system of a lobster is very simple, and is in fact most similar to the nervous system of a grasshopper. It is decentralized with no brain. There is no cerebral cortex, which in humans is the area of the brain that gives the experience of pain”. Wallace counter-argues this statement by mentioning the fact that since lobsters have a simpler nervous system compared to humans, they are unable to produce their own natural opiates. “One can conclude that lobsters are maybe even more vulnerable to pain, since they lack mammalian nervous systems’ built-in analgesia, or, instead, that the absence of natural opioids implies an absence of the really intense
This system is able to process information quickly due to the short distances between neurons (Williams, 2011). Williams (2011) notes, by invertebrate standards, octopuses show exceptional cognitive mental capabilities that are rivaled only by some of the “higher” vertebrates, such as chimpanzees, dolphins, and humans. The decentralized design of the nervous system allows for decision making at different levels, i.e.: in the brain, or in the arms, which possess their own peripheral nervous system (Mather & Kuba, 2013; Stolzenburg, 1993). The arm’s nervous system has twice as much “neural firepower” as the brain and contains approximately three-fifths of all the body’s neurons (Stolzenburg, 1993; Williams, 2011). This portion of the nervous system is semi-autonomous, performing with minimal input from the brain but, when necessary, can exert centralized control over the arms (Godfrey-Smith, 2013; Williams, 2011). The arms also contain several sensory organs, including statocysts, olfactory organs and a system that is analogous to the lateral line in fishes (Alves et al.,
A defining feature of the lionfish which everyone sees are the “18 venomous spines on its dorsal fin and its pelvic and anal fins, which are used for defense” as described in FACE OFF WITH THE ENEMY: LIONFISH by Special To The Citizen. Which is a neurotoxin that results in intense pain and swelling of one’s body. Fernando Simal, a marine hunter at STINAPA National Marine Park, found out the potency of their venom after his first hunt when being stung by the lionfish he caug...
Lionfish have brown and white stripes covering their body (NOAA, 2011). Lionfish have broad pectoral fins, and long individual dorsal spines that contain the venom glands in the tips (NOAA, 2011). The venom of the lionfish is only intended as a defense mechanism and not meant to kill. The spines of the lionfish deliver a sting that can result in severe pain, respiratory distress, and even paralysis (NOAA, 2011). Lionfish are found in almost all tropical marine habitats consisting of warm waters due to their invasive behavior. Their native range covers a very large area from western Australia and Malaysia east to French Polynesia and off the east coast of Australia to the Kermadec Islands of New Zealand (NOAA, 2011). Lionfish have been found along the coast from Florida to North Carolina. The first lionfish was reported in South Florida waters in 1985 with additional sightings occurring until they were documented as established in the early 2000s (NOAA, 2011). Lionfish are very popular aquarium fish, especially in the U.S making them important to the aquarium trade. There are two possible ideas about how the lionfish were introduced into the Atlantic. The first is through ballast water, the water carried in the bellies of the enormous transport ships of intercontinental trade (Whitney, 2003). Larval lionfish have low oxygen and food needs which makes surviving movement in ballast water a possibility (Whitney, 2003). The second possibility is that a number of...
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