Labechiida<\/a><\/p>\nGeologic Range<\/strong>
\nCambrian – Cretaceous <\/p>\nCommon Paleoecology<\/strong>
\nStromatoporoidea is an extinct class of stationary epifaunal suspension feeders which have been interpreted to have hosted symbiotic algae in their tissues<\/p>\nCharacteristics of the Class<\/strong><\/p>\n\n- Skeleton most often appears distinctly layered<\/li>\n
- Surface of the colony is commonly marked by bumps<\/li>\n
- Generally there is a hole in the center of each bump<\/li>\n
- Pattern of shallow grooves radiating from each canal opening<\/li>\n<\/ul>\n
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Davis (1998)<\/em>:<\/p>\n\n- The name stromatoporoid means “layered place”. This name is appropriate because the skeleton of these colonial creatures most often appears distinctly layered, especially in thin-section. The surface of the colony commonly is marked by bumps(see, for example, Labechia<\/em> on pl. VI). Generally there is a hole in the center of each bump; this is the opening of a canal feeding down into the mass of the colony. In many types of stromatoporoids there is a pattern of shallow grooves radiating from each canal opening. Stromatoporoids can be identified only after study of thin-sections of colonies.<\/li>\n
- For many years it was thought that stromatoporoids were long extinct, and there was much question as to just what kind of creatures they were. Then in the mid-1960’s some animals were discovered in the Caribbean which exhibited many of the characteristics of the ancient stromatoporoids. These “new” animals were found to be sponges.<\/li>\n<\/ul>\n
Nicholson & Murie (1878)<\/em>:<\/p>\n\n- Under Stromatopora<\/em>:<\/strong> Skeleton (“sarcodeme”) consisting of concentric calcareous laminae, separated by distinct “interlaminar spaces”, which are crossed by numerous vertical “radial pillars”. In some cases there are radiating water-canals and surface-grooves placed round minor centres. Sometimes there are seen on the surface the openings of large water-canals (“oscula”). <\/li>\n
- Habit-<\/i> Forming irregular masses, sometimes with a foreign body as a nucleus; spreading out into extended expansions, covered inferiorly by a thin striated calcareous membrane (“epitheca”), or growing in thin layers parasitically upon foreign objects.<\/li>\n<\/ul>\n
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