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gastropod egg capsule morphology

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Journal Article
Journal: PALAIOS
Published: 01 September 2009
PALAIOS (2009) 24 (9): 568-577.
... bivalves ranges from 18 to 67 mm. In this paper we describe egg capsules preserved on several bivalve shells from the Lower Jurassic (Hettangian) deltaic to nearshore deposits of Poland. The occurrence, morphology, and composition of these egg capsules point to gastropods as the most probable...
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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.
... ). On the basis of their morphology, composition, size and arrangement (e.g., Figs. 1 , 2 ), the egg capsules we investigated here have been attributed to neritimorph gastropods ( Zatoń et al. 2009 ). The egg capsules produced by neritimorphs are tough, and are composed of conchiolin as well as chitin ( Adegoke...
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Journal Article
Journal: Geology
Published: 01 September 2003
Geology (2003) 31 (9): 829-831.
... gastropod larvae was probably caused by predatory, selective forces. Protoconchs are early ontogenetic gastropod shells that are formed 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...
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Journal Article
Published: 01 February 2004
Journal of Paleontology (2004) 78 (2): 424-429.
.... F. Oyarzun , A. M. Vergara , and R. J. Thompson . 1999 . Energy investment in nurse eggs and egg capsules in Crepidula dilitata Lamarck (Gastropoda, Calyptraeidae) and its influence on the hatching size of the juvenile . Journal of Experimental Marine Biology and Ecology , 232...
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Journal Article
Published: 01 March 2008
Journal of Paleontology (2008) 82 (2): 213-237.
..., which they envelop 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...
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Journal Article
Published: 01 November 2011
Journal of Paleontology (2011) 85 (6): 1052-1066.
...Carlos Marques Da Silva; Bernard Landau; Rafael La Perna Abstract The Marginellidae Fleming and the Cystiscidae Stimpson, herein collectively referred to as marginelliform gastropods, are convergent families of thermophilic marine gastropods. Shallow-water marginelliform gastropods are found...
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Series: GSA Special Papers
Published: 01 July 2008
DOI: 10.1130/2008.442(07)
... is called the trochophore larva, and a similar larval type is developed in all molluscan groups. The trochophore larvae may be free swimming, as in the ancient gastropod groups (Patellogastropoda and Archaeogastropoda), or may occur in egg capsules, as in more advanced gastropods. The last larval stage...
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Journal Article
Published: 01 September 2000
Journal of Paleontology (2000) 74 (5): 839-852.
... for this study were obtained from all available sources of morphology: anatomical, conchological, radular, and egg capsule morphology. Opercular characters were used in preliminary analyses. However, the amount of variation in opercular morphology observed even within a single species was high enough to preclude...
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Journal Article
Published: 01 September 2004
Journal of Paleontology (2004) 78 (5): 914-919.
... of fine threads. Periostracum thick except in A. beckii ( Broderip, 1836 ). Callus restricted to parietal area. None to four columellar folds, two or three in most specimens. Egg capsule flat to globose, attached to hard subtratum, without external calcareous layer. Late Eocene-Middle Miocene...
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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 May 2018
Journal of Paleontology (2018) 92 (3): 412-431.
... coincides with its emergence from an egg and formation of the nepionic constriction (Naef, 1921– 1923 ; Arnold et al., 1987 ; Ward, 1987 ; Tajika et al., 2015 ). Both reflect stress following the emergence of the hatched animal from the egg capsule (Arnold et al., 1987 , 2010 ). Although the change...
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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. Fig. 6 Oklaconus okmulgeensis n. gen. n...
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Journal Article
Journal: PALAIOS
Published: 01 August 2012
PALAIOS (2012) 27 (8): 550-559.
... of the concavities in the tubes resemble eggs or egg cases produced by certain recent invertebrate species. Morphologically similar egg capsules are laid by the snails of the family Neritidae, which have inhabited shallow-marine and freshwater environments since some time in the Mesozoic ( Kano et al., 2002...
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Journal Article
Published: 01 November 2005
Micropaleontology (2005) 51 (5): 345-372.
... in facilitating uptake of oxygen or organic solutes. Podocopid Ostracoda have direct development of instars, lacking larvae or pelagic stage. Thomontocypris is a good demersal swimmer, but Xylocythere can only crawl. Both lay eggs, rather than brooding them in the female carapace, though nothing is known...
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Journal Article
Published: 01 October 2015
Journal of Paleontology (2015) 89 (3): 487-493.
... : Iberus , v. 27 , p. 113 – 154 . Penchaszadeh P.E. , and Rincon A ., 1996 , Egg capsules and development of Prunum prunum (Gmelin, 1791) (Prosobranchia: Marginellidae) from...
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Journal Article
Published: 10 October 2019
Journal of the Geological Society (2019) jgs2019-110.
... the evidence for rapid burial it is likely that the water column biota is under-represented. Sponges are the dominant sessile element, with brachiopods, echinoderms (the edrioasteroid Heropyrgus and a crinoid), a cirripede, coral, and a possible dendroid graptolite and gastropod ( Platyceras ?) as minor...
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Journal Article
Journal: PALAIOS
Published: 01 May 2015
PALAIOS (2015) 30 (5): 388-402.
... of the Touro Passo River. Most encrusting organisms on these shells were gastropods, insect eggs or capsules, algae, and fungi. The vast majority of encrusting organisms lacked calcified structures ( Kotzian and Simões 2006 ). Indeed, encrusting organisms from river environments might not be as skeletonized...
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Journal Article
Published: 01 July 2001
Journal of Paleontology (2001) 75 (4): 870-882.
... formed in depressions on the volcanic landscape. Some of the freshwater interbeds occurring from north of Sana'a to south of Taiz contain fossilized plants, as well as freshwater bivalves, gastropods, and ostracods ( Geukens, 1966 ). Three freshwater interbeds were recognized at Ar Rhyashia, one...
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Journal Article
Journal: PALAIOS
Published: 01 October 2008
PALAIOS (2008) 23 (10): 683-699.
... studies have interpreted increased precipitation in the Bighorn Basin during the PETM interval ( Koch et al., 2003 ; Shellito et al., 2003 ; Bowen et al., 2004 ). Studies of fossil floras ( Wing et al., 2005 ) and changes in the sedimentology, morphology, and geochemistry of paleosols through the PETM...
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