Lamniformes, also known as Mackerel Sharks, is one of the most well-known groups as it includes famous species and feared hunters, like the Great White Shark, Basking Shark, Mako (Shortfin and Longfin) and Megamouth. This group has a particularly large mouth, ideal for seizing and immobilising large prey as well as for tearing off chunks of meat from hapless victims. The Megalodon, now extinct, was also part of this fascinating group. Other members include the Goblin and Thresher sharks.
Lamniformes have two dorsal fins, neither of which is spined. They also have an anal fin, five gill slits and small spiracles (in most species), which are situated behind the eyes. The eyes have no nictitating membrane, and usually roll back in the case of frontal impact in order to protect them.
The mouths of these sharks are large, with jaws extending far back to allow them to open as widely as possible, gulping down large prey and chunks of flesh. These jaws are filled with lamnoid teeth, characterised by very large anterior teeth, followed by increasingly smaller intermediate teeth and large lateral teeth and then a row of small posterior teeth. The Basking Shark and the Megamouth sieve plankton through bristle-like structures in their mouths.
How should I go about choosing my topic?
Begin by reading the explanations below. Examples of each are provided below!
- Division Essay: find a topic that people might tend to underestimate or over-simplify. In other words, choose something that the average person might not know much about, and therefore can't really understand how complex or interesting that topic really is. Your job in the essay will be to break your topic down into meaningful and important categories.
- Classification Essay: think about the categories we place things in everyday and the characteristics of those categories. The topic you choose should allow you to argue that something has been misplaced.
How should I organize this essay?
As you write, keep these guidelines in mind:
- Your thesis statement and introduction will need to explain why these divisions/ classifications should matter to your reader.
- Your thesis statement and introduction MUST define or explain the category you plan to discuss (i.e. A sport is a competitive, physical activity therefore cheerleading should be considered a sport.)
- You should organize your body paragraphs so that each division or category has it's own paragraph or section. (i.e. cardio exercise is paragraph 1 and weightlifting is paragraph 2, etc.)
Division Essay Examples
If you want to lose weight, simply saying that you're going to "exercise" everyday may not be the most effective way to do so. Exercising is more complex than many people realize--attaining your goals will involve understanding how different types of exercise can help you achieve your goals.
Types of Exercise
- cardio: burns calories and strengthens your heart (running, using an elliptical or stair-stepping machine, etc.)
- weight lifting: tones muscles, increases physical strength, burns fat (using weights or weighted machines)
- recreational/sports: depending on the sport, can provide both cardio and toning benefits (cycling, tennis, kayaking)
We could also narrow this topic down a bit further and write about the important differences between different types of cycling.
Types of Cycling: stationary (exercise) biking, road biking, mountain biking, recreational biking
Classification Essay Examples
To write this type of essay, we'll need to think about things that should or should not be placed in a particular category.Example: Batman (that's our topic!) is not a superhero (category people place him in), but is simply a local vigilante (category he belongs in).
Ask yourself: Why do I think that...?
- Does not possess super powers (powers most humans don't possess).
- Chooses to be a hero, rather than being "chosen" by others/other forces.
Example: Cheerleading (That's our topic!) should be considered a sport (It belongs in the category, "sports").
Ask yourself: Why do I think that...?
- cheerleaders go to "practice" and must be in good physical shape
- cheerleaders work together toward a common goal
- cheerleaders must "try out" for their squad and often compete against other squads