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
Crayfish
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