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 کاملsurvey on the rule of the due & hindering relying on the sheikh ansaris ideas
قاعده مقتضی و مانع در متون فقهی کم و بیش مستند احکام قرار گرفته و مورد مناقشه فقهاء و اصولیین می باشد و مشهور معتقند مقتضی و مانع، قاعده نیست بلکه یکی از مسائل ذیل استصحاب است لذا نگارنده بر آن شد تا پیرامون این قاعده پژوهش جامعی انجام دهد. به عقیده ما مقتضی دارای حیثیت مستقلی است و هر گاه می گوییم مقتضی احراز شد یعنی با ماهیت مستقل خودش محرز گشته و قطعا اقتضاء خود را خواهد داشت مانند نکاح که ...
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ژورنال
عنوان ژورنال: Annals and Magazine of Natural History
سال: 1886
ISSN: 0374-5481
DOI: 10.1080/00222938609460191