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Invertebrates: Sponges: Entobia cretacea Portlock (Mississippi) |
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Written by Keith Minor
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Entobia cretacea Portlock, 1843 (casts of borings covering the internal mold of Volutomorpha conradi (Gabb)) 
Remarks Collection: Mississippi Museum of Natural Science. Photos by Curator George Phillips. Thanks! -
Formation: Navarro Group Equivalent, Prairie Bluff Chalk, Late Maastrichtian in Age -
Location: Oktibbeha County, Mississippi
We'd like to thank Earl Manning for correcting our caption. The filled borings cover the steinkern (internal mold) of Volutomorpha conradi (Gabb), not its shell. Thanks! For everyone's clarification, the filled clionid borings were originally bored into the now-dissolved shell. General Info Synonyms (older names and misidentifications in the literature) Borings of a clionid sponge -
1822 parasitical bodies Mantell -
1837 Entobia Bronn -
1838 Entobia Bronn; Bronn -
1843 Entobia cretacea Portlock -
1848 Entobia conybeari Bronn -
1848 Entobia cretacea Portlock; Bronn -
1850 Clionites conybeari (Bronn); Morris -
1851 Clionites conybeari (Bronn); Morris -
1852 Cliona conybeari (Bronn); Bronn & Roemer -
1852 Entobia cretacea Portlock; Morris -
1854 Cliona cretacea (Portlock); Morris -
1856 Cliona conybeari (Bronn); Morris -
1856 Cliona conybeari (Bronn); Bronn -
1868 Cliona cretacea (Portlock); Fischer -
1875 Cliona conybeari (Bronn); Geinitz -
1883 Cliona cretacea (Portlock); Hinde -
1932 Cliona cretacica Fenton & Fenton -
1958 Cliona cretacica Fenton & Fenton; Richards -
1960 Cliona celata micropora Nestler -
1962 Entobia cretacea Portlock; Häntzschel -
1965 Entobia cretacea Portlock; Häntzschel -
1968 Cliona cretacea (Portlock); Fischer -
1970 Entobia cretacea Portlock; Bromley
Stratigraphic Occurrence (by no means an all-inclusive list) White Limestone of northern Ireland (probably Campanian) -
Top of the Upper Chalk of England (Early Campanian) -
Chalk Rock of England (Late Turonian) -
Prairie Bluff Chalk of Mississippi -
Monmouth Group, Navesink Formation of New Jersey -
Monmouth Group, Mount Laurel Formation of New Jersey -
Matawan Group, Merchantville Formation of New Jersey -
Taylor Group, Sprinkle Formation of central Texas
Age - Entobia cretacea Portlock ranges from at least the Late Turonian Stage to the Late Maastrichtian Stage (89-66 mya). Most Early Cretaceous bivalves from Texas also have borings attributable to clionid sponges, so the ichnotaxon Entobia cretacea Portlock may have a range much longer than is suggested here. We'll continue to add literature reports as we come across them.
Geographic Occurrence (by no means an all-inclusive list) - England
- Monmouth County, New Jersey
- Northern Ireland
- Oktibbeha County, Mississippi
- Travis County, Texas
Remarks For identification and descriptions, see: Bromley, H. G. 1970. "Borings as Trace Fossils and Entobia cretacea Portlock, as an Example. 6. Redefinition of Entobia cretacea". In: Crimes, T. P.; Harper, J. C., ed's. Trace Fossils. Geological Journal, Special Issue 3, 79-82; plates 4 and 5.
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Last Updated ( Sunday, 13 January 2008 )
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