A haptophyte bearing siliceous scales: ultrastructure and phylogenetic position of Hyalolithus neolepis gen. et sp. nov. (Prymnesiophyceae, Haptophyta)

Protist
Masaki YoshidaIsao Inouye

Abstract

A haptophyte alga bearing hyaline but conspicuous scales was discovered in surface water samples of Shiribeshi Seamount, Japan. X-ray elemental analysis confirmed that silica was the major element in these scales. These scales were hat-shaped, ellipsoidal in top view, 4-6mum wide and 5-7mum long, perforated by several small pores, and were deposited on cells in several layers. Beneath the siliceous scale layers, organic scales were present, which are typical of haptophytes. The cells were non-motile despite having two short flagella hidden in the scale case. The haptonema, extended over the scale case, and one and a half times the cell length. The intracellular features were typical of haptophytes, including the peripheral endoplasmic reticulum (PER), Golgi cisternae with peculiar dilations, and the flagellar apparatus. The siliceous scales were produced in vesicles in the posterior region of the cell. Motile cells lacking silica scales were observed occasionally when cultures were maintained at lower temperatures and under oligotrophic conditions. This alga was described as Hyalolithus neolepis gen. et sp. nov. Phylogenetic analysis using the SSU rDNA and rbcL gene sequences indicated that Hyalolithus is a member of the Prymne...Continue Reading

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Citations

Oct 19, 2012·Extremophiles : Life Under Extreme Conditions·Tomohiko Kuwabara, Kensuke Igarashi
Feb 5, 2016·Nature Communications·Grażyna M DurakGlen L Wheeler
Dec 12, 2007·The New Phytologist·Julien DesclésPascal J Lopez
Feb 13, 2013·The Plant Journal : for Cell and Molecular Biology·Naoji Yubuki, Brian S Leander
Dec 1, 2012·Journal of Phycology·Brandon DrescherAlison R Taylor
Oct 18, 2016·Journal of Phycology·Colleen A DurkinE Virginia Armbrust
Oct 13, 2016·Molecular Biology and Evolution·Alan O MarronDaniel J Richter
Nov 15, 2017·Scientific Reports·Grażyna M DurakGlen L Wheeler
May 1, 2018·Advanced Biosystems·Marieh B Al-HandawiPanče Naumov

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