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Revision of the Astacidae (Paperback) Loot Price: R368
Discovery Miles 3 680
Revision of the Astacidae (Paperback): Walter Paxon
Revision of the Astacidae (Paperback): Walter Paxon

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Revision of the Astacidae (Paperback)

Walter Paxon

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Loot Price R368 Discovery Miles 3 680

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1885. Not illustrated. Excerpt: ... lack the bilobed plaited lamina of the Potamobiinoe, although the stem may be expanded into a wing; the epipodite of the first maxilliped almost always carries branchial filaments; the coxopoditic seta) terminate in hooks; the telson is not divided by a transverse suture. Six genera of Parastacina) have been described; viz. Astacoides, by Guerin; Cheraps and Engceus, by Erichson; Parunephrops, by White; Astacopais and ParastacHS, by Huxley. Some of these genera are based on too trivial characters to be valid. The group will be revised in the second part of this memoir. CAMBARUS. In the genus Cambarus, established by Erichson in 1846, t the cephalothorax is subcylindrical. The last thoracic somite is devoid of gills, neither are there any traces of rudimentary pleurobranchia) on the anterior somites; the hindmost podobranchia has no lamina. The branchial formula is as follows: --Somite. J Pudoiikani Iii.k. ARThnonnancm.E. I'i.eubobranciii.k. Anterior. l'osterior. VI 0 (cp.). 0... 0... 0 = 0 (ep.) VII 1... 1... 0... 0 = 2 VIII 1...1...1...0 = 3 IX 1... 1... 1... 0 = 3 X 1... 1... 1... 0 = 3 XI 1... 1... 1... 0 = 3 XII 1... 1... 1... 0 = 3 XIII 0...0...0...0 = 0 G-j-ep. + G + 5 + 0 = 17 + op. This gives a total of thirty-four branchiae, counting those on both sides of the thorax. The orifice of the green gland is situate near the apex of the short conical tubercle of the basal segment of the antennule. The third (in C. Montezumw and C. Shufeldlii the second and third), or the third and fourth pairs of legs in the male, have a prominent tubercle or hook on the anterior border of the third segment. The first pair of abdominal appendages in the male are terminated by styles, hooks, or teeth. A more or less mobile annulus is situated on the sternum of the female, just b...


Imprint: General Books LLC
Country of origin: United States
Release date: 2012
First published: 2012
Authors: Walter Paxon
Dimensions: 246 x 189 x 4mm (L x W x T)
Format: Paperback - Trade
Pages: 82
ISBN-13: 978-1-150-89812-9
Barcode: 9781150898129
Categories: Books
LSN: 1-150-89812-7

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