Arachnids have respiratory structures called 'Book Lungs', however they in no way resemble the lungs in a mammal. Instead, they are folded sheets of thin tissue that allow gases to be exchanged with the environment.
Arachnida are in the class Arachnida themselves, not in reptilia.
arachnida has 15 segments
Maria Rambla has written: 'Opiliones (Arachnida)' -- subject(s): Arachnida, Opiliones
arachanae
Arachnida
R. I. Pocock has written: 'Arachnida' -- subject(s): Arachnida, Spiders, Classification 'Mammalia' -- subject(s): Mammals
Brent D. Opell has written: 'Revision of the genera and tropical American species of the spider family Uloboridae' -- subject(s): Arachnida, Classification, Uloboridae 'The Nearctic Hahniidae (Arachnida: Araneae)' -- subject(s): Arachnida, Classification, Hahniidae
Arachnida
8 legs
Vincent Daniel Roth has written: 'Distribution and taxonomy of the Genus Cybaeus in Oregon (Arachnida: Agelenidae)' -- subject(s): Arachnida
J. H. P. Sankey has written: 'British harvestmen' -- subject(s): Arachnida, Identification, Opiliones 'Provisional atlas of the harvest-spiders (Arachnida : Opiliones) of the British Isles' -- subject(s): Arachnida, Geographical distribution, Maps, Opiliones
Mites and Ticks, a group of invertebrates related to spiders. All belong to the order Acarina of the class Arachnida. : Class Arachnida ---HOPE This helps