منابع مشابه
Calcareous sponges of Indonesia
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متن کاملCalcareous sponges of Indonesia.
The calcareous sponges collected during Indonesian-Dutch research projects, incorporated in the collections of the Naturalis Biodiversity Center (formerly the Rijksmuseum van Natuurlijke Historie and the Zoölogisch Museum of the University of Amsterdam), are described and discussed. A total of 37 species were distinguished, of which 16 are new to science, while several others are very poorly kn...
متن کاملFirst fossil record of parasitism in Devonian calcareous sponges (stromatoporoids).
INTRODUCTION Palaeozoic calcareous sponges (stromatoporoids) are common bio-constructing fossils; they are sometimes found in association with helicoidal structures of unknown biological affinities. The interaction between the tube-forming organisms has usually been classified as commensalism. METHODS About 260 stromatoporoid skeletons from the Middle Devonian (Givetian) of the Mont d'Haurs s...
متن کاملGastrulation in Calcareous Sponges: In Search of Haeckel's Gastraea.
Haeckel's studies of development in calcareous sponges (1872) led him to develop the "Gastraea Theory," which proposes that the ancestral mode of germ layer formation, or gastrulation, was by invagination to produce a functional gut. His observations that gastrulation in the Calcarea occurs by invagination of a ciliated larva upon settlement and metamorphosis were supported by remarkable photom...
متن کاملSpicule formation in calcareous sponges: Coordinated expression of biomineralization genes and spicule-type specific genes
The ability to form mineral structures under biological control is widespread among animals. In several species, specific proteins have been shown to be involved in biomineralization, but it is uncertain how they influence the shape of the growing biomineral and the resulting skeleton. Calcareous sponges are the only sponges that form calcitic spicules, which, based on the number of rays (actin...
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ژورنال
عنوان ژورنال: Annals and Magazine of Natural History
سال: 1869
ISSN: 0374-5481
DOI: 10.1080/00222936908695986