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egg capsule morphology

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Journal Article
Journal: PALAIOS
Published: 01 September 2009
PALAIOS (2009) 24 (9): 568-577.
... Cross Mountains area, central Poland. In most instances, only the bases of the egg capsules are preserved as dark outer rings with hollow cavities inside. Some specimens, however, are preserved as dark circular spots or even shallow depressions on the bivalve molds. The general occurrence, morphology...
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Journal Article
Journal: Paleobiology
Published: 01 January 2001
Paleobiology (2001) 27 (3): 485-499.
...Régis Chirat Abstract No egg of any fossil nautiloid has yet been discovered. However, anomalies of embryonic shell growth, described for the first time in several Mesozoic Nautilida, provide important clues on morphology, structure, and size of their egg capsules; on the physical characteristics...
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Journal Article
Journal: PALAIOS
Published: 01 June 2015
PALAIOS (2015) 30 (6): 482-489.
... to phosphatization, the egg capsules retained their original morphology preserving both the lower attachment base and upper hemispherical cover. Comparison with recent and fossil gastropod egg capsules indicates that these were not produced by neritimorphs, the egg capsules of which are known from the Lower Jurassic...
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Journal Article
Journal: Paleobiology
Published: 08 July 2014
Paleobiology (2014) 40 (4): 529-540.
... in fossils as old as Middle Cambrian and Silurian, the majority of records come from much younger, Cenozoic deposits. In this paper, we report the preservation of chitin in Early Jurassic neritimorph gastropod egg capsules deposited in bivalve shells from prodelta-deltafront and nearshore paleoenvironments...
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Journal Article
Published: 01 May 2010
American Mineralogist (2010) 95 (5-6): 761-769.
... to slightly elongate and 5–50 μm in diameter. From material recovered after opening capsules, 3 to 7 separate aliquots were analyzed (Table 1 ). For each run pattern, X En and X Fo were calculated. The sets were averaged, with an associated standard error, for each run. The errors represent combinations...
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Series: Geological Society, London, Special Publications
Published: 01 January 2010
DOI: 10.1144/SP339.13
EISBN: 9781862395879
... morphological ones) which support the monophyly of Lissamphibia with respect to Amniota ( Laurin 2002 ). Ruta et al. (2003) and Ruta & Coates (2007) proposed a monophyletic origin of extant amphibians among temnospondyls, and placed ‘lepospondyls’ among reptiliomorphs (Fig.  1 e). According...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2421(08)
...; and topaz-OH and phase Egg in sediments. Phase D, stable in peridotite composition, and δ-AlOOH phase, stable in sediment, may transport significant amounts of water at least to 1200–1500 km depth. Studies of phase relations in hydrous peridotite show that the phase boundaries from olivine to wadsleyite...
Journal Article
Journal: Geology
Published: 01 September 2003
Geology (2003) 31 (9): 829-831.
... by planktonic larvae and within egg capsules. In well-preserved fossil gastropods, protoconchs may be preserved on the apex of the adult shell. Consequently, gastropod shells reflect ontogenies and life histories to an exceptionally high degree when compared to most other marine invertebrates ( Jablonski...
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Journal Article
Journal: Palynology
Published: 01 March 2016
Palynology (2016) 40 (S1): 2-131.
... Evitt visited the influential European palynologists Georges Deflandre and Alfred Eisenack during late 1959 and, while in Tulsa, first developed several groundbreaking hypotheses. He soon realised that the distinctive morphology of certain fossil dinoflagellates, notably the archaeopyle, meant...
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Journal Article
Published: 01 March 2010
Journal of Paleontology (2010) 84 (2): 216-230.
... in the biology of both vegetative and encysted stages (the latter at a much lower metabolic rate) in modern microalgae ( Pahlow et al., 1997 ; Lee, 2008 ) but serve the same purpose equally well in cyanobacteria or metazoan egg capsules. Resting and/or reproductive process-bearing cysts formed inside...
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Journal Article
Published: 01 May 2018
Journal of Paleontology (2018) 92 (3): 412-431.
... of the hatched animal from the egg capsule (Arnold et al., 1987 , 2010 ). Although the change in septal spacing is often linked with hatching in Nautilus , the intraspecific variability in the chamber length pattern is high (Stenzel, 1964 ). Except in Ophioceras (Turek and Manda, 2016 ), the variability...
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Journal Article
Published: 04 December 2017
Journal of Paleontology (2017) 92 (2): 157-169.
.... Carboniferous coleoids show a high morphological plasticity with a capacity for being altered to create the diverse combinations of ‘bactritoid’ and ‘coleoid’ structures. This could be the principle evolutionary driver of their radiation in the late Carboniferous. Family Oklaconidae new family...
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Journal Article
Published: 29 June 2017
Journal of Paleontology (2017) 92 (1): 3-13.
... separated from each other by broad, deep corner sulci, and they exhibit triradial, pentaradial, or predominantly tetraradial symmetry. However, the morphology of the aperture and the modes of growth of carinachitid skeletons as well as the anatomy of their soft parts are unknown. Examination of a single new...
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Journal Article
Published: 01 March 2008
Journal of Paleontology (2008) 82 (2): 213-237.
... with the foot (B. Morton, 1986 ), but some deepwater forms prey on echinoderms ( Darragh and Ponder, 1998 ). The protoconch is generally smooth and is commonly of one to three whorls, but it is multiwhorled in some species. All modern volutes produce large eggs in capsules; most eggs develop directly...
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Series: NRC Monograph Publishing Program
Published: 01 January 2008
EISBN: 9780660198200
... of Centrosaurus and other centrosaurines. However, the cranial morphology underwent a remarkable ontogenetic change, in which the nasal and supraorbital horns of the juveniles transformed into a huge nasal boss and smaller supraorbital bosses, and the frill became adorned with spikes and horns on top...
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Journal Article
Published: 01 September 2000
Journal of Paleontology (2000) 74 (5): 839-852.
... esophagus to aid in the retention of food following ingestion ( Fretter and Graham, 1962 ). Payne and Crisp (1989) report that nassariines lacks this caecum. The distribution of this character among other nassariids or buccinids is not known. States—0, Absent; 1, Present. Egg Capsule Morphology...
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Journal Article
Journal: PALAIOS
Published: 01 August 2012
PALAIOS (2012) 27 (8): 550-559.
.... 55 , p. 103 – 114 . Zatoń M Niedźwiedzki G Pieńkowski G 2009b , Gastropod egg capsules preserved on bivalve shells from the lower Jurassic (Hettangian...
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Journal Article
Published: 01 July 2003
Journal of Paleontology (2003) 77 (4): 792-795.
... part of the shell but, after fertilization by means of the detached arm of the male in the mantle cavity, are deposited in a gelatinous mass within the arms and surrounding shell until they hatch (ovovivipary). A quite different process of retaining the hatched young either in an outer egg capsule...
Journal Article
Journal: PALAIOS
Published: 01 October 2011
PALAIOS (2011) 26 (10): 658-664.
... Coors porcelain capsule-form crucible as a base, and all were handled with gloved fingers or forceps. Prior to each treatment, each crucible set was polished with a lint-free cloth and weighed empty using an AG204 Mettler Toledo balance. One subsample pair was placed in each of eight crucibles, one...
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Journal Article
Published: 01 February 2004
Journal of Paleontology (2004) 78 (2): 424-429.
... in Virginia . Virginia Division of Mineral Resources Publication 127 , Charlottesville, Virginia , 259 p. Chaparro , O. R. , R. F. Oyarzun , A. M. Vergara , and R. J. Thompson . 1999 . Energy investment in nurse eggs and egg capsules in Crepidula dilitata Lamarck (Gastropoda...
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