aracnídeos
Autor: Vinicius Santos e Matheus | Publicado: 2012-08-22T19:18:00-07:00

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 &nbsp;
&nbsp;
aracnideos

O que são&nbsp; 

Os aracnídeos são organismos
pertencentes à classe Arachnida do filo dos Artrópodes. Desta classe fazem
parte mais de 60.000 espécies, entre elas: aranhas, carrapatos, escorpiões,
etc.

Características 

&nbsp;Os artrópodes possuem um
sistema nervoso bastante desenvolvido e muitos deles, como a aranha e o caranguejo,
possuem exoesqueleto, ou seja, uma dura carcaça externa.

Dentro desta enorme variedade, a grande maioria desta espécie é composta&nbsp;
por animais terrestres que respiram através de traquéias. Contudo, alguns
realizam a respiração cutânea e outros possuem pulmões folhosos.

Os aracnídeos são em sua maior parte, predadores, algumas espécies, inclusive,
possuem glândulas de veneno com o qual abatem as suas presas.

Sua reprodução se dá por meio de fecundação
interna, geram ovos de onde saem diminutos seres que não passarão por metamorfose.

Uma curiosidade sobre alguns aracnídeos como as aranhas e os ecorpiões, é o
fato de que as primeiras são capazes de sobreviver em muitos tipos de
ambientes, já os escorpiões são mais facilmente encontrados em regiões mais
áridas. Contudo, ambos podem viver próximos da água. Algumas aranhas,
inclusive, são capazes de andar sobre a água para capturar suas presas.