Among the more than 40,000 species of spiders around the world, it’s not always easy to know if we’re dealing with a poisonous or not, but we still know that it’s a relatively small, big-name spider, these predators dominate respect just by hearing about them.It’s easy to imagine one, isn’t it? Those articulated legs, unparalleled agility and Hollywood-worthy imaginary fantasies.But when you think of a spider, how do you imagine its eyes, how many eyes does a spider have?What about the legs?
In this peritoAnimal article we answer these questions and explain the basic anatomy of a spider, so you know how to recognize it, even in your imagination.
- Different species of spiders can be found around the world.
- Always in terrestrial habitats.
- There are currently about 40.
- 000 species of spiders on the list.
- But it is believed that less than a fifth of existing spider species are described.
- In other words.
- Many of those are not yet known.
Spiders are arthropod insects of the Arachinid class of the order Araneae, which includes species of spiders whose families can be classified into sub-orders: Mesothelae and Opisthothelae.
Although the classification of spiders may vary, it is common to group them according to patterns of their anatomy, and the number of eyes of a spider is a relevant factor in this systematic classification.The two sub-orders currently listed are:
Most have 8 eyes, but among the more than 40,000 species of spiders, there are exceptions: in the case of the dysderidae family, they can have only 6, spiders of the family Tetrablemma can only have 4, while those of the Caponiidae family can have only 6 eyes.They only have 2 eyes. There are also spiders that don’t have eyes, those that live in caves.
The eyes of the spiders are on the head, as well as the kelpeters and pedipalps, placed, almost always, in two or three curved or ascending rows, called the beam of the eye.In larger spiders, it is possible to see how many eyes a spider has.you have even with the naked eye, according to the photo.
Despite so many eyes, the number of them is not what actually leads them to their prey, most spiders have not developed the vision, since this is practically a secondary meaning for these arthropods, they may see nothing but shapes or changes in light.
The secondary sense of the spiders’ view also explains why many of them hunt at dusk or at night, which really allows them to move accurately is their hypersensitivity due to hairs scattered throughout the body, detecting vibrations.
There are exceptions and the jumping spider, or papa fly (Salticidae), is one of them, the species that belong to this family are the most seen during the day and have a vision that allows them to recognize predators and enemies, being able to detect movements., direction and distance, assigning different functions to each pair of eyes.
The legs, segmented body, and jointed limbs are the characteristics of a spider most visible to the naked eye. Spiders do not have antennae, but have a well-developed central nervous system, as well as reflective legs and legs that allow them to explore and recognize. the environment, even in the case of spiders that do not have eyes.
The basic anatomy of a spider consists of
Most spiders have 8 legs (four pairs), segmented into 7 parts: the thigh, trochanter, femur, patella, tibia, metatarsal, tarsus and (possibly) nails, middle nail touching the net.many legs for a not-so-large body have a function beyond agile movement.
The first two pairs of front legs are the most used to explore the environment, taking advantage of the layer of hair that covers them and their sensory capacity. Strands of hair under the nails (scopules), on the other hand, help with grip and stability when the spiders move on softer surfaces. However, unlike other arthropods, instead of muscles, the legs of spiders are extended due to the hydraulic pressure typical of these species.
In terms of sizes, the largest and smallest known species are
Out of curiosity, a spider’s life expectancy can vary considerably depending on the species and conditions of its habitat, while some species have a life expectancy of less than 1 year, such as the wolf spider, others can live 20 years, as is the case.The spider known as “number 16” was famous for breaking the record for the oldest spider in the world, is a spider trap (Gaius villosus) and lived for 43 years.[1]
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