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Eosurcula
''Eosurcula'' is an extinct genus of gastropod from the Eocene of Asia, Europe, and North America. Species * † ''Eosurcula capayana'' Vokes 1939 * † ''Eosurcula cohni'' Dickerson 1915 * † ''Eosurcula inconstans'' Cooper 1894 * † ''Eosurcula moorei'' Gabb, 1860 from Bartonian in Texas * † ''Eosurcula praeattenuata'' Gabb 1868 * † ''Eosurcula stena'' (Edwards, 1857) from Hampshire Original description Genus ''Eosurcula'' was originally described by Thomas Lincoln Casey (entomologist), Thomas Lincoln Casey in 1904. Casey's original text reads as follows: References This article incorporates public domain text from reference. * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 131) * P. Jeffery and S. Tracey. 1997. The Early Eocene London Clay Formation mollusc fauna of the former Bursledon Brickworks, Lower Swanwick, Hampshire. Tertiary Research 17(3-4):75-137 * R. L. Squires. 2001. Additions to the Eocene megafossil fauna of the Llajas Formation, Simi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eosurcula Cohni
''Eosurcula'' is an extinct genus of gastropod from the Eocene of Asia, Europe, and North America. Species * † ''Eosurcula capayana'' Vokes 1939 * † '' Eosurcula cohni'' Dickerson 1915 * † ''Eosurcula inconstans'' Cooper 1894 * † '' Eosurcula moorei'' Gabb, 1860 from Bartonian in Texas * † '' Eosurcula praeattenuata'' Gabb 1868 * † ''Eosurcula stena'' (Edwards, 1857) from Hampshire Original description Genus ''Eosurcula'' was originally described by Thomas Lincoln Casey in 1904. Casey's original text reads as follows: References This article incorporates public domain text from reference. * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 131) * P. Jeffery and S. Tracey. 1997. The Early Eocene London Clay Formation mollusc fauna of the former Bursledon Brickworks, Lower Swanwick, Hampshire. Tertiary Research 17(3-4):75-137 * R. L. Squires. 2001. Additions to the Eocene megafossil fauna of the Llajas Formation, Simi Valley, southern California. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eosurcula Praeattenuata
''Eosurcula'' is an extinct genus of gastropod from the Eocene of Asia, Europe, and North America. Species * † ''Eosurcula capayana'' Vokes 1939 * † ''Eosurcula cohni'' Dickerson 1915 * † ''Eosurcula inconstans'' Cooper 1894 * † '' Eosurcula moorei'' Gabb, 1860 from Bartonian in Texas * † '' Eosurcula praeattenuata'' Gabb 1868 * † ''Eosurcula stena'' (Edwards, 1857) from Hampshire Original description Genus ''Eosurcula'' was originally described by Thomas Lincoln Casey in 1904. Casey's original text reads as follows: References This article incorporates public domain text from reference. * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 131) * P. Jeffery and S. Tracey. 1997. The Early Eocene London Clay Formation mollusc fauna of the former Bursledon Brickworks, Lower Swanwick, Hampshire. Tertiary Research 17(3-4):75-137 * R. L. Squires. 2001. Additions to the Eocene megafossil fauna of the Llajas Formation, Simi Valley, southern California. C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eosurcula Inconstans
''Eosurcula'' is an extinct genus of gastropod from the Eocene of Asia, Europe, and North America. Species * † ''Eosurcula capayana'' Vokes 1939 * † ''Eosurcula cohni'' Dickerson 1915 * † ''Eosurcula inconstans'' Cooper 1894 * † ''Eosurcula moorei'' Gabb, 1860 from Bartonian in Texas * † ''Eosurcula praeattenuata'' Gabb 1868 * † ''Eosurcula stena'' (Edwards, 1857) from Hampshire Original description Genus ''Eosurcula'' was originally described by Thomas Lincoln Casey (entomologist), Thomas Lincoln Casey in 1904. Casey's original text reads as follows: References This article incorporates public domain text from reference. * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 131) * P. Jeffery and S. Tracey. 1997. The Early Eocene London Clay Formation mollusc fauna of the former Bursledon Brickworks, Lower Swanwick, Hampshire. Tertiary Research 17(3-4):75-137 * R. L. Squires. 2001. Additions to the Eocene megafossil fauna of the Llajas Formation, Simi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eosurcula Capayana
''Eosurcula'' is an extinct genus of gastropod from the Eocene of Asia, Europe, and North America. Species * † '' Eosurcula capayana'' Vokes 1939 * † '' Eosurcula cohni'' Dickerson 1915 * † '' Eosurcula inconstans'' Cooper 1894 * † '' Eosurcula moorei'' Gabb, 1860 from Bartonian in Texas * † '' Eosurcula praeattenuata'' Gabb 1868 * † ''Eosurcula stena ''Eosurcula'' is an extinct genus of gastropod from the Eocene of Asia, Europe, and North America. Species * † ''Eosurcula capayana'' Vokes 1939 * † ''Eosurcula cohni'' Dickerson 1915 * † ''Eosurcula inconstans'' Cooper 1894 * † ''Eos ...'' (Edwards, 1857) from Hampshire Original description Genus ''Eosurcula'' was originally described by Thomas Lincoln Casey in 1904. Casey's original text reads as follows: References This article incorporates public domain text from reference. * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 131) * P. Jeffery and S. Tracey. 1997. The Early Eoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eosurcula Taomeyi
''Eosurcula'' is an extinct genus of gastropod from the Eocene of Asia, Europe, and North America. Species * † ''Eosurcula capayana'' Vokes 1939 * † '' Eosurcula cohni'' Dickerson 1915 * † '' Eosurcula inconstans'' Cooper 1894 * † '' Eosurcula moorei'' Gabb, 1860 from Bartonian in Texas * † '' Eosurcula praeattenuata'' Gabb 1868 * † ''Eosurcula stena ''Eosurcula'' is an extinct genus of gastropod from the Eocene of Asia, Europe, and North America. Species * † ''Eosurcula capayana'' Vokes 1939 * † ''Eosurcula cohni'' Dickerson 1915 * † ''Eosurcula inconstans'' Cooper 1894 * † ''Eos ...'' (Edwards, 1857) from Hampshire Original description Genus ''Eosurcula'' was originally described by Thomas Lincoln Casey in 1904. Casey's original text reads as follows: References This article incorporates public domain text from reference. * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 131) * P. Jeffery and S. Tracey. 1997. The Early Eoce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whorl (mollusc)
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in numerous gastropods, but it is also found in shelled cephalopods including '' Nautilus'', '' Spirula'' and the large extinct subclass of cephalopods known as the ammonites. A spiral shell can be visualized as consisting of a long conical tube, the growth of which is coiled into an overall helical or planispiral shape, for reasons of both strength and compactness. The number of whorls which exist in an adult shell of a particular species depends on mathematical factors in the geometric growth, as described in D'Arcy Wentworth Thompson's classic 1917 book '' On Growth and Form'', and by David Raup. The main factor is how rapidly the conical tube expands (or flares-out) over time. When the rate of expansion is low, such that each subsequent whorl is not that much wider than the previous one, then the adult shell has numerous whorl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (mollusc)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term ''aperture'' is used for the main opening in gastropod shells, scaphopod shells, and also for '' Nautilus'' and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a '' gape''. Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. In gastropods In some pros ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
