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3 prmin thickness(Pl. B, D). They seemto have been originally organicas arethe lamellaein the chitinousjaws (compare Pl. E). Thus,the ultrastructureof the pro-ostracumis unique and lacks any ultrastructuralresemblanceto either the prismaticor nacreouslayersof the phragmocone. The Jaws. The jaws of the specimen show thin laminationsthat are fracturedin a "step-like"pattern(Pl. 1, Fig. E). Similar fracturepatternshave also been observedin broken gladii of fossil squid-like coleoids (Doguzhaeva& Mutvei, 2003), The resemblance between the ultrastructureof the outer layer of the proostracumand the jaws indicatesthat both are composedof organicmaterial.

Pp. 203-222. , FLASH, T. and HOCHNER, B. 2005. Nature, 433: 595-596. 28 2ndInternational Symposium- Coleoid CephalopodsThrough Time - Prague 2005 Comparison of adhesiveorgan betweenldiosepius sp. at ABSTRACT: Histological, histochemicaland ultrastructuralmethods were applied to elucidate the nature of the secretionin the epithelial cells of three ldiosepius species(1. This folm ofadhesionmaybethe resultofadaptionto habitatand behaviorof Idiosepius. Keywords: Coleoid cephalopods,adhesion,adhesivegland,glue compounds,Idiosepius,EupryynnrscoLopes,duogland-system,Stefan-type-adhesion Attachmentin cephalopodsis primarily achievedby reducedpressuresystemsas in sllckers on the arms, tentacles or defined dermalstructureson the mantle(von Boletzky and Roeleveld,2000).

EXPLANATION. L nnamed coleoid; sp. no. \ustria. 2 mm. B Pro-ostracum composedof the two organiclayers:the innerone is of columnarunits (cu) and the ollterone is of micro-plates(pl) arrangedparallelto the surface;scalebar - 15 gm. C. Close-upof B to showmicro-lamination of the columnarunits(ml); scalebar - 6 um. D. The ultrastructnre of the micro-platesof the or,rter layer;scalebar - 3 Um. E. Thin laminationand step-likefracturepatternin a jaw; scalebar - 6 pm.

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