Reitner, Joachim

[["dc.bibliographiccitation.firstpage","335"],["dc.bibliographiccitation.journal","Geologisch-paläontologische Mitteilungen, Innsbruck"],["dc.bibliographiccitation.lastpage","347"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Mehl, Dorte"],["dc.date.accessioned","2019-07-10T08:12:34Z"],["dc.date.available","2019-07-10T08:12:34Z"],["dc.date.issued","1995"],["dc.description.abstract","Sponges are primitive metazoan organisms which occur since the late Proterozoic. The oldest sponge remains (hexactinellids) are from a shallow marine carbonate facies of the late Sinian Shibantan Member (China). From the Tommotian (Sansha, China) protospongiid and rossellimorph hexactinellids were discovered in shallow marine silicified rocks. The middle part of this section consists of silty shales with entirely preserved hexactinellid sponges: Sanshadictya, Hyalosinica, Solactinella, Triticispongia, Hunanospongia. The hexactinellids typically are soft bottom dwellers, which sometimes grow on and form in situ spiculites (spicule mats). The sponges from the Chengjiang deposits of Atdabanian age, which show a rossellimorph spicule organization typical of the conservative hexactinellid groups, which inhabited the deep sea during most of the Phanerozoic, were also typical soft bottom dwellers. All sponge taxa (Leptomitella, Leptomitus, Paraleptomitella etc.) described from this locality we consider to be hexactinellids and not demosponges, as originally classified. The sponge communities of carbonate-dominated archaeocyathid mounds are completely different from the above described sponge mounds. The sponges from the archaeocyath mounds of the Flinders Ranges (S.Australia) are characterized by Calcarea and demosponges ($; modern type of pharetronid Calcarea Gravestockia pharetroniensis, and many tetractinellid demosponges, Geodiida). Questionable is the origin of four-rayed demosponge spicules found in some archaeocyaths. The oldest ceractinomorph demosponges are documented from the middle Cambrian (Vauxia - an aspicular sponge with keratose affinities, and isolated sigmata microscleres). Sponge communities of the Early Cambrian were highly developed, and already then they were taxonomically strongly dependent on substrates and trophic conditions."],["dc.description.abstract","Schwammfragmente (Hexactinelliden) stammen aus einer flachmarinen Karbonatfazies im späten Sinium des Shibatan Members in China. Aus dem Tommotium (Sansha, China) wurden protospongiide und rossellimorphe Hexactinelliden innerhalb flachmariner, verkieselter Gesteinsformationen entdeckt. Der mittlere Abschnitt dieses Profils besteht aus siltigem Tongestein mit körperlich erhaltenen hexactinelliden Schwämmen: Sanshadictya, Hyalosinica, Solactinella, Triticispongia, Hunanospongia. Die Hexactinelliden sind typische Weichbodenbewohner, die manchmal in-situ-Spiculite (Spicula-Matten) bilden und auf diesen wachsen. Die Schwämme der Chengjiang Lagerstätte (Atdabatium), die eine • rossellimorphe Sklerenanordnung, typisch für konservative Hexactinellidengruppen des tieferen Wassers während des Phanerozoikums, zeigen, waren ebenfalls charakteristische Weichbodenbewohner. Alle Spoilgien-Taxa, die von dieser Lokalität beschrieben sind (Leptomitella, Leptomitus, Paraleptomitella, ect.), werden von uns als Hexactinellida angesehen und nicht als Demospongiae, wie sie sie ursprünglich klassifiziert wurden. Die Schwamm-Gemeinschaften der karbonatreichen Acrchaeocyathidenmounds unterscheiden sich von den oben beschriebenen Spongien mounds signifikant. Die Schwämme aus den Archaeocyathenmounds der Flinders Ranges (Südaustralien) sind charakteristischerweise Calcarea und Demospongiae (pharetronide Calcarea von \"moderner\" Organisation wie Gravestockia pharetroniensis und viele tetractinellide Demospongiae der Geodiida). Umstritten bleibt der Ursprung der vierstrahligen demospongiiden Spicula, die in einigen Archaeocyathen gefunden wurden. Die bisher ältesten ceractinomorphen Demospongien sind aus dem mittleren Kambrium nachgewiesen (Vauxia - ein aspikulärer Schwamm mit Affinität zu den Keratosen, und isolierte Sigmata\\ Mikroskleren). Spongien-Gemeinschaften des frühen Kambriums waren hochentwickelt und in ihrer taxonomischen Zusammensetzung schon damals sehr vom Substrat und Nahrungsangebot abhängig."],["dc.format.mimetype","application/pdf"],["dc.identifier.ppn","50499400x"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/2195"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60963"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.rights","Goescholar"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject","Paläontologie: Allgemeines"],["dc.subject.ddc","560"],["dc.title","Early paleozoic diversification of sponges ; new data and evidences"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","243"],["dc.bibliographiccitation.lastpage","255"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Mehl, Dorte"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.editor","Kohring, Rolf"],["dc.date.accessioned","2019-07-10T08:12:35Z"],["dc.date.available","2019-07-10T08:12:35Z"],["dc.date.issued","1996"],["dc.description.abstract","Astraeospongium is found to form secondary calcareous basal skeletons and thus may be attributed to the morphological grouping \"coralline sponges\". In A. meniscum, a bowl-shaped sponge with a massive skeleton of octactins, the ontogenetically youngest and still uncemented spicules are found at the upper, concave surface, particularly close to the edge. Towards the bottom, the spicules soon become altered through epitaxic cementation and recrystallization. From this skeletal architecture can be inferred that the soft tissues occupied only the uppermost portions of the basal skeleton. The skeletal structure is in many respects similar to that of the recent Petrobiona massiliana, although the ecological adaptations of the two species are fundamentally different."],["dc.description.abstract","Astraeospongium bildet ein sekundäres kalkiges Basalskelett und kann somit der morphologischen Gruppierung \"koralline Spongien\" zugerechnet werden. In A. meniscum, ein schüsseIförmiger Schwamm mit einem massiven Skelett aus Octactinen, befinden sich die ontogenetisch jüngsten und noch unzementierten Spicula an der oberen, konkaven Seite, insbesondere nahe dem Rand. Zum Basis hin ändern sich bald die Spicula durch epitaktische Zementation und Rekristallisation. Aufgrund dieser Skelettarchitektur kann geschlossen werden, daß sich der Weichkörper nur in den obersten Bereichen des Skeletts befand. Die Skelettstruktur ist der der rezenten Petrobiona massiliana in vielerlei Hinsicht ähnlich, wenngleich sich die ökologischen Anpassungen der beiden Arten grundlegend unterscheidet."],["dc.identifier.ppn","506616819"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/2206"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/93711"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.publisher","Fachber. Geowissenschaften"],["dc.publisher.place","Berlin"],["dc.relation.ispartof","Miscellanea palaeontologica"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject","Paläontologie: Allgemeines"],["dc.subject.ddc","560"],["dc.title","Observations on Astraeospongium meniscum (Roemer, 1948) from the Silurian of western Tennessee; constructional morphology and palaeobiology of the Astraeospongiidae (Calcarea, Heteractinellidae)"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5"],["dc.bibliographiccitation.journal","Verhandlungen des Naturwissenschaftlichen Vereins in Hamburg"],["dc.bibliographiccitation.lastpage","32"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Mehl, Dorte"],["dc.date.accessioned","2019-07-10T08:12:33Z"],["dc.date.available","2019-07-10T08:12:33Z"],["dc.date.issued","1996"],["dc.description.abstract","The monophyly of the Porifera is weil established. According to our hypothesis the Hexactinellida are the adelphotaxon of the Pinacophora (new taxon = Calcarea + Homoscleromorpha + Demospongiae). The Porifera are the adelphotaxon of the Eumetazoa/Placozoa. Sponge spicules are considered not to be a constituent character of the Porifera. Mineralized spicules developed independently within the three poriferan main taxa the Hexactinellida, Calcarea, and Demospongiae. Demospongian microscleres are not derived from megascleres in contrast to those of Hexactinellida. Accordingly, spicules probably developed several times within the Demospongiae. Remains of Porifera are known since the late Proterozoic."],["dc.format.mimetype","application/pdf"],["dc.identifier.ppn","504997033"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/2189"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60958"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.rights","Goescholar"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject","Paläontologie: Allgemeines"],["dc.subject.ddc","560"],["dc.title","Monophyly of the Porifera"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]