...Kelly Lee Acker; Michael J. Risk Abstract The boring sponge Cliona caribbaea is ubiquitous on the shallow terraces around Grand Cayman Island, British West Indies, occurring as brown sheets covering and growing over both live corals and hard substrate. Throughout the zone of the radial grooves...

...Dieter K. Futterer Abstract The marine siliceous boring sponge Cliona boring into carbonate substrates of biogenic or non-biogenic origin produces characteristic particles of 15 to 100 micron in size. These particles were quantitatively determined without difficulties by grain size analysis using...

... such as Cliona ) are filled with lithified sand, micrite, or acicular crystalline cement. Just beneath the reef surface is extensive lithification of poorly sorted micritic sediments between and within the framework. Sand trapped in interframework cavities is consolidated by drusy cements. In many places...

... of a sponge (? Cliona sp.). A radiocarbon date of 8250 ± 320 years BP (GSC-3433) on several Hiatella valves from the burrows gives the age of a sea-level stand at 8 m asl at the locality, during which penecontemporaneous surf erosion or beach gravel deposition led to the demise of the shells. Other unoccupied...

... ), sipunculid worms ( Phascolosoma and Themiste ), and clinoid sponges ( Cliona ). Abundances are locally high (e.g., up to 120 sipunculids per 1,000 m 3 of rock). Other prominent but slightly less abundant borers include bryozoans, regular echinoids, and polychaete annelids (eunicids, spionids, and possibly...

... species of Halimeda can be useful sediment tracers, with H. goreauii and H. opuntia being characteristic of fore-reef slope environments and H. cryptica essentially restricted to the deep fore-reef. The present study confirms that boring sponges particularly Cliona sp. generate significant quantities...

... surface of rock showing dense cover of algal mat. Bar scale for D and E is 1.2 cm. 204 B. JONES and Q.H. GOODBODY Homotrema. Also visible on the undersides are sponge papillae (mainly Cliona) and the entrances tothe pelecypod borings. Living in cavities and crevices in the rock are small shrimps, crabs...

...FIGURE 10 —Bioerosion of shells in bags. (A) Percentage of shells with bioeroding organisms (primarily Cliona ), all taxa combined. (B) Average size of Cliona cover for shells with borings, all taxa combined. (C) Box plot showing medians, first and third quartiles, 95% confidence limits...

...FIGURE 4 —Boring traces. A) Traces of the boring sponge Cliona ( Entobia isp.) on a shell of Tellina gouldii from sample station L7. B) Boring traces of predating gastropods of the family Muricidae ( Oichnus simplex , cylindrical). C) Boring traces of predating gastropods of the family...

... synonymy because of the confused systematics of the latter. Modern borings that are similar to the fossil ichnospecies Entobia glomerata are made by the sponges Aka de Laubenfels, 1936 (= Siphonodictyon Bergquist, 1965 ) and Cliona amplicavata ( Pleydell and Jones, 1988 ). Although this boring...

...Figure 4. Log-transformed ratio of the osculum area to surface area (OSA/SA) of fossil ( Diagoniella , Eiffelospongia , Hazelia , Vauxia , Pirania , Laocoetis , Stauractinella , Camerospongia , Thectardis ) and modern ( Haliclona , Neopetrosia , Callyspongia , Cliona , Tethya...

...Saloua Gargouri GeoRef, Copyright 2008, American Geological Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France 1982 Africa Arthropoda Bivalvia borings Cenomanian Cirripedia Cliona Cretaceous Crustacea...