Senin, 23 November 2015

An Arachnid Groups : Spiders

An arachnid groups or classes of phylum arthropods that includes spiders, scorpions and others, the name comes from the Arachnids spiders, the first animals known to the group, and most terrestrial Arachnids or living on Earth. Easy, all nutrients are carnivorous, eating insects, most have some extra help as the spiders and scorpions that has poison in the prey, digestion that occurs outside the body. Arachnids reproduce with internal fertilization, and produce eggs.

For this occasion, I will describe a little bit about spiders. Find out more information


Unlike the insects have three body parts, the spiders only have two. The front segment called the cephalothorax or prosoma, which actually is a combination of the head and the chest (thorax). While a segment of the back is called the abdomen or opisthosoma (abdomen). Between the cephalothorax and the abdomen there is a connecting thin named pedicle or pedicellus.

On the cephalothorax is attached to four pairs of legs, and one to four pairs of eyes. In addition to a pair of large fanged JAWS (called chelicera), there are also a pair or some similar mouth hand tool called pedipalpus. On some types of spiders, the male animal pedipalpus enlarged and changed functions as a tool in marriage.

Spiders do not have mouth or teeth to chew. Instead, the mouth of the spiders form tool suction to suck its prey's body fluids.

Up to now, around 40000 spider species have been introduced, and classified into 111 tribe. However, given that these animals are so diverse, many of whom are small-bodied, often hidden in nature, and even many of the specimens in the museum who has not breakfast buffet well, believed that the possibility of a variety of types of spiders can entirely reach the 200,000 species.

The order of this spider is divided into three large groups in the suborder levels, namely:
  1. Mesothelae, a primitive spider is not poisonous, with sections of the body that seem obvious; shows a closer kinship with her ancestors namely arthropod with many roads.
  2. Mygalomorphae or Orthognatha, as group of spiders that make Burrows hideaway, and also which makes the hole traps in the ground. Many large-bodied, its kind of like a tarantula and also lancah maung.
  3. Araneomorphae spiders are a group of ' modern '. Most spiders we meet are included in this suborder, given that its members consist of 95 tribes and covers approximately 94% of the total number of species of spiders. Fangs of these groups leads to a somewhat slanted forward (and not erect as the tarantula) and driven in opposite directions like claws in biting its prey.