Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) / Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII

Metadata

Gutenberg ID

44525

Title

Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) / Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII

Language

en

Book source

Project Gutenberg

Description max 80 words

Ernst Haeckel presents a monumental monograph on Radiolaria collected during the HMS Challenger expedition, detailing over 4,000 species of microscopic marine organisms. This scientific work combines rigorous taxonomy with evolutionary insight, offering readers a glimpse into the deep-sea world and the intricate beauty of siliceous skeletons.

Summary up to 500 words

In this monumental volume, Professor Ernst Haeckel presents the first part of a comprehensive monograph on Radiolaria collected during the historic voyage of H.M.S. Challenger between 1873 and 1876. Dedicated to this exhaustive study for ten years, Haeckel describes approximately 4,300 species, including over 3,500 newly identified forms. The text specifically focuses on the subclass Porulosa, encompassing the orders Spumellaria and Acantharia, which are distinguished by their four-jointed cortical shells and complex double medullary structures. Haeckel meticulously documents the dimensions, habitats, and morphological variations of these microscopic organisms, ranging from the central Pacific to the Atlantic. He details genera such as *Panartus* and *Cannartidium*, noting how specific adaptations like polar spines or fenestrated tubes define different lineages. A significant portion of the work functions as a complete historical record, integrating all literature on Radiolaria up to 1884 while redescribing older species through the lens of modern phylogenetic principles. The report underscores the profound significance of Radiolarian ooze in deep-sea sediments, revealing that these delicate creatures form the bulk of the siliceous mud found at abyssal depths of 2,000 to 4,000 fathoms. Haeckel highlights the exceptional quality of specimens prepared by Dr. John Murray, which were stained with carmine and mounted in Canada balsam; these preparations often contained dozens of new species, preserving internal structures with remarkable clarity. By integrating rigorous morphological investigation with oceanographic data, Haeckel bridges artificial classification systems with the theory of descent. Although he acknowledges that even this extensive survey leaves much unexplored—suggesting a second decade of work would be needed for true completeness—the volume stands as an invaluable foundational text. It provides future investigators with a detailed resource that connects the vast diversity of microscopic marine life to broader evolutionary concepts, effectively opening a new world to morphological investigation.

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