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3. Sclerobionts on soft-bottom, free-living Stylomaeandra Fromentel corals from the Lower Cretaceous Agrio Formation, Neuquén Basin, Argentina: palaeobiological implications for umbrella-shaped colonies.

Author

Luci, L., Garberoglio, R.M., Lazo, D.G., and Manceñido, M.O

Subjects
*CORALS, *DEEP-sea corals, *PALEOECOLOGY, *COLONIES, *BRACHIOPODA, *BRYOZOA, *INCRUSTATIONS
Abstract

Several beds hosting corals are found within the marine members of the Agrio Formation (Lower Cretaceous, Neuquén Basin). In one of them, free-living, soft-bottom pedunculate colonies of Stylomaeandra sp. occur commonly; their palaeoecology and sclerobiont community were surveyed. The best-preserved coral specimens were statistically analysed; their upper and lower surfaces were mapped. Stylomaeandra sp. morphology suggests that it lacked automobility. Sclerobionts were dominated by thecideid brachiopods followed by oysters; other sclerobiont taxa comprise tubicolous polychaetes, cyclostome bryozoans, calcareous sponges and encrusting corals. Sclerobionts are more speciose and abundant in the coral's lower surfaces, the upper ones being scarcely colonized, indicating likely in vivo encrustation. Serpulid tubes were often embedded within the coral's skeleton, an example of in vivo interaction by bioimmuration. On most undersurfaces sclerobionts were clustered, half or more of such surfaces remaining unoccupied. This suggests part of the colony undersurface rested on the seafloor, agreeing with the small pedicle and lack of automobility of Stylomaeandra sp. In the coral meadows, Stylomaeandra sp. dwelled among larger massive and ramose corals and in their vicinity; but unlike the latter, that coped better with sedimentation, the umbrella-shaped Stylomaeandra sp. were eventually smothered. [ABSTRACT FROM AUTHOR]

Published
2021
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4. Post-mortem and symbiotic sabellid and serpulid-coral associations from the lower cretaceous of Argentina

Author

Garberoglio, R.M. and Lazo, D.G.

Subjects
Scleractinia, Hauterivian, Argentina, Sabellidae, Serpulidae, Sabellida, Symbiosis, Anthozoa
Abstract

One morphotype of sabellids (Sabellida, Sabellidae) and two of serpulids (Sabellida, Serpulidae), found as encrusters on scleractinian ramose corals of the species Stereocaenia triboleti (Koby) and Columastrea antiqua Gerth, from the Agrio Formation (early Hauterivian) from Neuquén Basin, Argentina, are described. The identified morphotypes, Glomerula lombricus (Defrance), Mucroserpula mucroserpula Regenhardt and Propomatoceros sulcicarinatus Ware, have been previously recorded from the Early Cretaceous of the northern Tethys. Two different type of sabellid and serpulidcoral associations have been recognized. The first and more abundant association corresponds to post-mortem encrustation on corals branches. The second one corresponds to a symbiotic association between the serpulid P. sulcicarinatus and both species of corals. The serpulid tubes are recorded parallel to the coral branches reaching the upper tip of them and they were bioimmured within the coral as they grew upwards. The studied symbiotic relationship between serpulids and corals may be regarded as a mutualism as both members probably benefited each other. This type of association has similarities with recent cases of symbiosis between serpulids and corals, but had no fossil record until now. © 2011 by the Sociedade Brasileira de Paleontologia. Fil:Garberoglio, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lazo, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.

Published
2011

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