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no-22-contribuicao-para-o-conhecimento-da-fauna-do-kimeridgiano-da-mina-de-lignito-guimarota-leiria-portugal-iii-parte-1973

Nº 22 - Contribuição para o Conhecimento da Fauna do Kimeridgiano da Mina de Lignito Guimarota (Leiria, Portugal) - III Parte (1973)


Nº 22 – Contribuição para o Conhecimento da Fauna do Kimeridgiano da Mina de Lignito Guimarota (Leiria, Portugal) – III Parte (1973)Category: Publications, Memórias (Nova Série)
Last updated: 28/04/2021

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Papers

1. III Parte – V – Upper Jurassic Lizards from middle Portugal
J. Seiffert

Abstract: By the management of Prof. Dr. S. HENKEL and Prof. Dr. W. G. KÜHNE, Institut für Paläontologie, frie Universität Berlin, the little coal-mine Guimarota at Leiria (Central Portugal) yielded a rich vertebrate fauna consisting of Mammalia and abundant skeletal elements of fishes, amphibians and reptiles.The lacertilians are described with regard to the important indication of terrestrial synecologic life with the Upper Jurassic mammals. Certain findings from the localities Porto das Barcas and Porto Pinheiro have been recognised.

(…) Parcial abstract

2. III Parte – VI – Teeth of Ornithschian Dinosaurs from the Upper Jurassic of Guimarota Mine (Portugal)
R. A. Thulborn

Abstract: The application of specialized palaeontological techniques has brought to light a number of small dinosaurs in the Upper Jurassic of Portugal. This paper deals with four of these dinosaurs.These are referred to the family Hypsilophodontidae of the order Ornithischia and they are represented only by isolated teeth. The earliest of the Portuguese hypsilophodontids comes from the Callovian at Pedrógão; this animal (Alocodon kuehnei gen. et sp. nov.) seems to be a fairly direct descendant of the Triassic Fabrosaurus australis.

The second hypsilophodontid (Phyllodon henkeli gen. et sp. nov.) was discovered in the early Kimmeridgian of Guimarota and seems to represent a rather specialized divergence from the main line of hypsolophodontid evolution. The two remaining dinosaurs come from the late Kimmeridgian of Porto Pinheiro. The first of these (Trimucrodon cuneatus gen. et sp. nov.) is probably a close relative of Echinodon becklesii from the English Purbeck. The other is a species of Hypsilophodon which is directly antecedent to the Wealden Hypsilophodon foxii.

Thogh these Portuguese fossils are very fragmentary they do permit critical reappraisal of relationships, and of evolutionary trends, within the hypsolophodontid plexus at the heart of ornithischian history.

3. III Parte – VII – Chelonia From the Upper Jurassic of Guimarota Mine (Portugal)
H. Bram

Abstract: The turtles can mainly be authenticated by remains of the shell. Other recognizable parts of the skeleton, e. g. vertebrae, or bones of the girdles and the extremities, are very rare. These remains of the shell chiefly consist of little fragments; very few bones of the shell which are complete or almost complete have been found. In one case only, there are a neural and a pleural still in a natural connexion on one plate.This degree of preservation of turtle fossils is frequent; shells to some extent complete are a rare exception. The cause thereof is a late growing together of the sutures. Only very old turtles show a total coalescece. moreover there are types which have all their lives persisting fontanelles, and such with joints in their shell. Whenever the coalescece is incomplete, a fast postmortem decay follows. The slightest movement caused by wind or water, or by the activity of carcass easters results in the shell falling to pieces. After the organic substance has decayed, the plate-like bones are usually rather brittles. The slightest vibrations of transportation cause them to fall apart easily into smaller fragments.

The shells of the turtles show great individual modifications. Among the turtles of one species there are always specimens whose theca shows characteristics of closely related species. To be able to get a positive picture of a fossil turtle you have at least to find a shell which is to some extent complete.

For these reasons it isn’t possible to identify the remains of Guimarota exactly. Evenso there are different types which can be positively distinguished. The question is, whether there are one of several species within each group of types. This question cannot be determined by means of the material known at present. Most likely each group belongs to another family. More complete findings only could lead us to a more positive certainity.

in the following shall be demonstrated, that one type (Plesiochelys) settled in the sea near the coast, which it sometimes left, at least to lay eggs. The two other types lived in fresh water and its immediate surroundings.


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