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Transactions - The Connecticut Academy of Arts and Sciences Volume 25

Sciences, Connecticut Academy of

ISBN 10: 1130952789 / ISBN 13: 9781130952780
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2012. Paperback. . . . . . Books ship from the US and Ireland. Bookseller Inventory # V9781130952780

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Title: Transactions - The Connecticut Academy of ...

Publisher: RareBooksClub.com

Binding: Soft cover

Book Condition: New

About this title

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...and if spinnerets are preserved spiders can be recognized as such even if all other characters are indistinguishable or missing. Tertiary spiders possess already all the characters of recent spiders, including the epigynum in females and the copulatory apparatus on the terminal joint of the palpus in the male. The external appearance of Tertiary spiders is much the same as in common spiders of the present time and their habits, in a general way, must have been similar. It is difficult to say whether the paucity of material is attributable to the poor conditions prevailing in the Tertiary for the preservation of spiders, or to the relative paucity of the spider fauna itself of that period. For the recent spider fauna runs into several hundred as against the forty-seven Tertiary spiders of the same geographical region. Considering the numerous species preserved in the European amber we may reasonably assume that the real number of American Tertiary spiders must have been considerable. S U15-0RL)ER MYGALOMORPHvE. Spiders with an unsegmented abdomen and two pairs of lungs. Articulation of chelicerae such that the fangs move in a plane parallel to the plane of symmetry. This sub-order comprises two families, Aviculariidae and Atypidae. FAMILY AVICULARIIDJE. Usually four, sometimes two spinnerets. (Anterior spinnerets belonging to the fourth abdominal somite and found in Atypidae and other spiders are missing in Aviculariidae.) Eyes eight or six, usually situated on an elevation and forming a compact group. Anterior median eyes alone of the diurnal type. Coxae of pedipalps without maxillary lobes. A very large family comprising almost all recent Theraphosid spiders and practically limited to the equatorial and tropical belts. In this country the family is represe...

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