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The magnitude of the worldwide invasions of Didemnum vexillum Kott, 2002 has taken a number of years to be comprehended. During the past 15 years, it has been identified as different species depending on its location—D. carnulentum on the U.S. west coast, D. lutarium or D. vestum in New England, D. lahillei or D. helgolandicum in France and the Netherlands,(More)
BACKGROUND The question of how many marine species exist is important because it provides a metric for how much we do and do not know about life in the oceans. We have compiled the first register of the marine species of the world and used this baseline to estimate how many more species, partitioned among all major eukaryotic groups, may be discovered. (More)
Numerous colonies of the invasive colonial ascidian Didemnum vexillum Kott, 2002 have been found in the Lagoon of Venice (Italy) in 2012, overgrowing fouling organisms on maritime structures such as docks, pilings, and pontoons. This is the first record for the Mediterranean Sea. A survey conducted in July 2012 revealed that D. vexillum is present in the(More)
A colonial tunicate belonging to the genus Didemnum has recently been found in many temperate coastal regions throughout the world, as well as large areas of Georges Bank in the NW Atlantic. It continues to spread rapidly and compete aggressively with native, hard substrate species (e.g., mussels, barnacles, bryozoans, other ascidians). In addition, it can(More)
The majority of invertebrate skeletal tissues are composed of the most stable crystalline polymorphs of CaCO(3), calcite, and/or aragonite. Here we describe a composite skeletal tissue from an ascidian in which amorphous and crystalline calcium carbonate coexist in well-defined domains separated by an organic sheath. Each biogenic mineral phase has a(More)
The ability to control crystallization is a critical requirement in the synthesis of many technologically important materials. [1±5] Crystalline inorganic structures with micrometer-scale regularity have applications in microelectronics, optics, information storage, biomedical implants, catalysis, and separation technologies. [6±9] Such patterned(More)
R Ra ap pi id d a as ss se es ss sm me en nt t s su ur rv ve ey y o of f n no on n-n na at ti iv ve e a an nd d n na at ti iv ve e m ma ar ri in ne e s sp pe ec ci ie es s o of f f fl lo oa at ti in ng g d do oc ck k c co om mm mu un ni it ti ie es s, , A Au ug gu us st t 2 20 00 03 3 This publication may not be reproduced, stored in a retrieval system or(More)