Geol. Mag. 127 (<5), 1990, pp. 587-589. Printed in Great Britain 587 CORRESPONDENCE AND NOTES A synonymized nomenclature for calcified sponges A. Yu. ZHURAVLEV*, F. DEBRENNEf & R. A. WOOD§ * Palaeontological Institute, USSR Academy of Sciences, Profsoyuznaya ul. 123, Moscow B321, U.S.S.R. tCNRS URA 12, Institut de Paleontologie, 8 Rue de Buffon, Paris 75005, France § Department of Earth Sciences, University of Cambridge, Downing St., Cambridge CB2 3EQ, U.K. (Received 19 March 1990; accepted 7 May 1990) Abstract - A synonymized nomenclature for calcified sponges (archaeocyaths, stromatoporoids, chaetetids, sphinctozoans and pharetronids) is here presented to enable comparison of suggested homologous structures. The rediscovery of living calcified sponges has renewed interest in the biology, phylogeny and ecology of related fossils, and many of these forms have been rescued from groups of previously problematic status. If we can prove poriferan affinity for these groups - the archaeocyaths, stromatoporoids, chaetetids and sphinctozoans - then this will have considerable implications for our understanding of the evolution of the Porifera as well as the evolution of fossil communities, especially within reefs. However, these groups have been worked on by specialists in isolation, and complex Table 1. Homologous structures and supposed synonyms for calcified sponges Stromatoporoid and chaetetid (Wood, 1987) Sphinctozoan (Finks, 1983) Archaeocyath (Debrenne, Zhuravlev & Rozanov, 1989) aquiferous unit space aquiferous unit aquiferous system (3) astrorhizae (3) astrorhizal canal (4) (calcareous) skeleton (5) [calicle] chimney (9) epitheca (13) (interlaminar space) (15) (foramina) ? lamina mamelon (17) osculum (18) pillar (19) primary calcareous skeleton (21) [pseudoseptum] reticulum (22) secondary calcareous skeleton (23) (tabula) (24) [tubercule] (1) (ambiostium) ambisiphonate (2) (aporate) [aquiferous unit space] [aquiferous unit] [aquiferous system] [astrorhizae] (endotube) (sclerosome) (cateniform) (6) cribribulla (7) endowall (8) endopore (10) exaulos (11) exowall (12) exopore chamber (14) interwall interpore (16) labripore [mamelon] (oscule) pillar [primary calcareous skeleton] prosiphonate (20) (protothalamus) protocysts radial trabeculae retrosiphonate (filling tissue) vesicle (diaphragm) (tubercule) stirrup-pore [ambisiphonate] non-porous [aquiferous unit space] [aquiferous unit] [aquiferous system] [astrorhizae] [astrorhizal canal] (cup) [calicle] thalamid [chimney] discontinuous microporous sheath tabular inner wall simple inner wall pore (holdfast) [exaulos] tabular outer wall simple outer wall pore intertabulum, chamber (tabula) (pore in tabula) [labripore] (dissepiment) [mamelon] (central cavity opening) [pillar] [primary calcareous skeleton] [prosiphonate] juvenile cup ?taenia ?dictyonal structure (invaginal inner wall) (secondary thickening, stereoplasm) (dissepiment) tubercule http://dx.doi.org/10.1017/S0016756800015478 Downloaded from http:/www.cambridge.org/core. IP address: 54.144.133.215, on 28 Nov 2016 at 09:50:57, subject to the Cambridge Core terms of use, available at http:/www.cambridge.org/core/terms.