By Theo Engeser (auth.), Neil H. Landman, Kazushige Tanabe, Richard Arnold Davis (eds.)
Renowned researchers summarize the present wisdom on ammonoid paleobiology. The ebook starts with an outline of the systematic place of the Ammonoidea in the Cephalopoda, offering the phylogenetic framework for the remainder of the publication. Following discussions contain smooth- and hard-part morphology of ammonoids, expense of development and ontogeny, and taphonomy and ecology. final chapters discover the distribution of ammonoids in time and house in addition to their extinction on the finish of the Cretaceous. With its varied viewpoints and new fabric, this source will profit researchers and graduate scholars in paleontology, marine biology, and evolutionary biology.
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The reproductive strategy of Nautilus 10 Chapter 1 (and probably of all fossil nautiloids) is K-selected, with few but well-developed large offspring. The adults can spawn several times and may live up to 20 years. , 1991), and maturity is reached in about 10 years. The development time in fossil forms with smaller embryonic conchs may have been shorter. The type of early development in Nautilus has already been demonstrated in many other nautiloids, although there is a lot of variation, which may serve to differentiate groups at higher rank.
Geowiss. [A] 124:123-191. Erben, H. , 1975, Ober die Cicatrix der Nautiloideen, Mitt. -Paliiont. Inst. Univ. Hamburg 44:59-68. Firby, J. , and Durham, J. , 1974, Molluscan radula from earliest Cambrian, f. Paleontol. 48:1109-1119. House, M. , 1988, Major features of cephalopod evolution, in: Cephalopods-Present and Past (J. Wiedmann and J. ), Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, pp. 1-16. , 1974, Remarks on the embryogeny and postembryonal development of ammonites, Acta Palaeontol.
19. Ammonoids were probably marine living. All Recent cephalopods are marine animals that rarely swim into brackish water. It follows that HASC and ammonoids were marine-living animals too. The apomorphic characters of the Ammonoidea plus the Bactritida are listed below. 1. A suture line formed with a ventral lobe. The "orthocerid" ancestors of the Ammonoidea (plus Bactritida) had straight suture lines. The development of a folded suture can therefore be considered apomorphic. Folding of the suture line increased the internal surface of a chamber, which was covered by a hydrophilic mucus layer.
Ammonoid Paleobiology by Theo Engeser (auth.), Neil H. Landman, Kazushige Tanabe, Richard Arnold Davis (eds.)