RESEARCH ON THE STEREOM IN SINOCRINUS LUI FROM THE KAILI FORMATION(CAMBRIAN),GUIZHOU,CHINA
Eocrinoids are the oldest class within the subphylum Blastozoa of the echinoderms,and they share many morphological similarities with the stalked crinoids(Pelmatozoa).Current research on the eocrinoid brachioles structure primarily focuses on the macroscopic level,with less study on the microscopic structure(stereom)of the brachioles.This paper,based on the general relationship between the microstructure of recent echinoderm ossicles stereom and the properties of embedded soft tissues,uses images from scanning electron microscopy and cathodo-luminescence microscopy to reveal the microstructure of the eocrinoid brachiole and the theca ossicles.The study finds that the theca of eocrinoid plates composed of coarse meshwork labyrinthic stereom,and the cover plates of the brachioles are primarily composed of the galleried stereom,while the floor plates consist of the labyrinthic stereom and galleried stereom between the brachiolar ossicle gaps.The galleried stereom are believed to be attachment areas for collagen tissues,combined with recent echinoderm structure and previous studies,suggesting that collagen tissue may be attached between the articular facets of Sinoeocrinus lui brachioles,and potentially influences their mobility.These results demonstrate that the study of the stereom plays an important role in reconstructing the body structures of the extinct echinoderm groups and offers new insights into the lifestyle of Sinoeocrinus lui.
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