Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was compiled by Prof A. Farinacci 1969-1989 and updated by Richard Howe 2000-2016 - see also this page.
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Current identification/main database link: Hughesius youngii da Gama & Varol 2013Compiled data
Diagnosis: Species of Hughesius with two elongated elements in the central area.
Description: This elliptical placolith has elongated two plates in the central area. When the species is aligned 45° to the polarizers, the elements of the shield become birefringent where the long axis of the plates touches the shield. In this respect it artificially resembles Cryptococcolithus biparteoperculata.
Size: Holotype; length 4.0 µm; width 2.4 µm
Etymology: In honour of Dr. Jeremy R. Young, Nannofossil specialist and good friend, UCL, UK.
Extra details from original publication
Remarks: Hughesius youngii is distinguished from Hughesius gizoensis by having strongly elongated central elements. The central plate is also made up of two pieces but rounded in H. gizoensis. The primary distinguishing characteristic is the birefringence of shield elements where apex of plates touches the shield.
Occurrence: H. youngii is recorded NN2-NN4, in Lower Miocene sediments of the Philippines, Vietnam, Malaysia, Indonesia, Gulf of Aden, West Africa, Brazil, Trinidad and Gulf of Mexico.