One important discovery Shubin made is Tiktaalik, which is a 375 million year old fossil. Tiktaalik is a fish that has scales and gills, but its head is flattened like that of a crocodile. Like most fish, Tiktaalik’s fins have ray bones enabling them to paddle in water, but the most amazing thing about it is that it has interior bones which allows it to lift off of the sea floor, something unordinary for a typical fish. It would use its limbs for support like a tetrapod. Shubin shows how fin structures of fish like Tiktaalik mark the beginning of the evolution into the mammalian paw and opposable thumb structures in the hands of today’s primates.
Two big differences are seen in the legs and the antenna. True crabs have 5 visible pairs of legs. The first pair are the claws and the other four pair are walking legs. In hermit crabs, the first pair are the claws but there are only two pairs
By touch they feel slippery and sticky. Their mucous like skin is so thin because, even though they have lungs, they absorb oxygen through their pores. They usually are unable to grown larger than the length of a man’s arm. However, reptiles can easily match the size and height of a man. Reptiles have a rough brittle exterior made from scales to protect the delicate skin that lies beneath, which makes them less susceptible to predators.
Its food generally consists of zooplankton, phytoplankton, and decaying plant matter. Some of the main organisms that prey on the barnacle include the whelk, shanny, seastar, and nudibranche. As a defense from predators, the barnacle has the ability to hide within the confines of the six protective plates whenever it feels threatened. This is a very important characteristic of the barnacle because it has no eyesight and relies entirely on its senses to survive. Although the Semibalanus balanoides have the ability to live in deeper waters such as the subtidal zone, they are generally found in the intertidal zone because they are heavily preyed upon in deeper waters.
The Advantageous Evolutionary Adaptations of Cuttlefish Sepia latimanus, or common name cuttlefish, can be considered as one of the most uniquely evolved creatures of marine habitat. The species, despite their name, are not a fish, but molluscs. Coming from kingdom animalia, phylum mollusca, class of cephalopods, they belong to the order of sepiida (thecephalopodpage.org). The adaptations this species acquired have formed an advantage unlike most others. Physiologically the cuttlefish is advanced in numerous ways.
The First Trimester takes place from the first week to the 13th week of pregnancy. Fertilization takes place when, in most cases, one sperm is able to make its way through the fallopian tube and burrow into the egg. Once fertilization occurs, the egg will change so that no other sperm can burrow into the egg. The sperm and egg form a new cell known as a zygote. Right when fertilization occurs, all of the child’s genes are set.
Their lungs lie across the arched ribs along the full length of their vertebra, almost to their anus, instead of along its rib cage (ventral) like most mammals. This helps with buoyancy and balance. Each long, wide but thin lung has its own cavity with its own diaphragm. Scientists don't know if they can function independently, but they do know that manatees can have a severe infection in one lung and be healthy in the other lung. This helps with buoyancy and balance.
It feeds on ectoparasites or dead tissue that it picks from the body and oral cavities/gills of these fish (e.g. ; Tangs or Groupers) in the wild or in the aquarium. This also helps to protect the fish from contracting diseases and infections. Many fish value its services so highly that they will allow it to clean the inside of their mouths, and not harm it. Some fish, though, such as Hawkfish, Lionfish, and some predatory shrimp and crabs may eat the Scarlet Skunk Cleaner Shrimp.
All About Jellyfish Jellyfish are very unique, aquatic creatures. They are classified in the phylum Cnidaria. The body of a jellyfish consists of 95 percent water, and in some species the percentage can range up to 99. It is umbrella-shaped and made of a soft jelly-like material. The wall of a jellyfish body is very fragile.
What I find peculiar about the bull shark is its ability to live in both marine habitats and freshwater habitats. In general, being able to survive in both habitats is very uncommon for sharks. Aquatic organisms rely heavily on a process called osmoregulation that allows them to achieve homeostasis of water content within their body. Without going into too much detail on the specifics of osmosis and osmotic pressure, this process allows the organism to keep their internal fluids from getting too diluted or too concentrated. So you may be asking yourself, how does this apply to the bull shark?