ammonoid in English
In the Lower Devonian, ammonoids appeared, leaving us large limestone deposits from their shells.
This study, which represents part of my Ph.D. thesis, could not have been performed without the thorough taxonomic work carried out by many Triassic ammonoid systematists that has provided the basis for this study.
Use "ammonoid" in a sentence
1. Other species have squat whorls, the whole ammonoid being so tightly rolled up as to be almost spherical.
2. The most remarkable features, however, are preserved organic sheets in the ammonoid phragmocones which are normally readily destroyed.
3. 8 Other species have squat whorls, the whole ammonoid being so tightly rolled up as to be almost spherical.
4. The differences in morphological plasticity are interpreted in terms of the function of the ammonoid conch, especially the orientation of the aperture during life.
5. On the other hand an analysis of current phylogenetic connections of certain ammonoid groups demonstrates that they give no clue for tracing homologies.
6. The anti-Darwinian “Typostrophe Theory” of O.H.Schindewolf can be put to the test by revisiting the ammonoid examples on which this macroevolutionary model was founded.
7. Ontogenetic analysis of chamber length, total suture length and lateral saddle dimensions of an Ammonoid shell reveal a possible new system requiring relatively little genetic information.
8. From 20 sections in the Tafilalt (eastern Anti-Atlas, Morocco), 13 early Emsian ammonoid species of the families Mimosphinctidae, Mimoceratidae, Teicherticeratidae, Mimagoniatitidae, and Auguritidae have been discovered.
9. Constructional and morphological analysis of ammonoid shells provides new and calculable features. In addition, it leads to a better understanding of a given form and its origin.
10. The new ammonoid speciesDesmoceras (Pseudouhligella) intrapunctatum (DesmoceratoideaZittel, 1895) is described and figured from the dark glauconitic marls of the Lower Albian of Ambatolafia (Mahajanga Basin of northwestern Madagascar).
11. The body chamber of an ammonoid of the genus Calliphylloceras (Suborder Phylloceratina) containing its lower jaw is reported from the Upper Bajocian (Strenoceras niortense Zone) of the Northern Caucasus.
12. A small piece, sectioned for investigation by scanning electron microscope, proved the existence of a slightly altered layer of mother of pearl, comparable with those of the ammonoid and nautiloid shells.
13. Tubes seem to have fossilized due to microbially mediated phosphatization that could be favoured by a set of parameters which operated rather at the scale of ammonoid carcasses: closed, poorly oxygenated conditions, and reduced pH.
14. Angiotonin lũy thừa hai của một số Betriebsordnung loan on policy patrol daub نقل بعده korfavora suppurativeottitis media macro language raketo ammonoid gaz aard-symmetrisch madaling-araw Elba tekenend consent lavice (ž.) obžalovaných mottagareapparat surface avalanche backward channel ip …
15. The depositional architecture and the geometric relationships between platform-slope deposits and basinal sediments along with paleontological evidence indicate the time interval of the younger Anisian Reitziites reitzi ammonoid zone to largely represent the main stage of platform aggradation at the Cernera and Bivera/Clapsavon carbonate platforms.
16. The following structural features clearly indicate that ammonoid shells were adapted to withstand considerably higher hydrostatic pressures thanNautilus shells: (1) the corrugated and marginally fluted septa gave the shell wall efficient support against implosion; (2) the secondary connecting rings could grow a great deal in thickness; and (3) the last formed chambers remained full of liquid which supported the last septum.