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The type species of the genus Ptychocylis is P. urnula described originally by Claparède & Lachmann as Tintinnus urnula in 1858. Lorica dimensions given as averaging 140 µm in length and 100 µm in diameter.
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Dimensions of the most common Ptychocylis species based on the text of the original species descriptions. The length (black arrow) is the middle of the range given in Brandt 1896, Brandt 1906-1907. The grey arrow is the lorica oral diameter based on the total length (not given in the text of the discriptions). Brandt, rather than Claparède & Laachmann, is used for P. urnula because they did not state exactly what 'diameter' was.
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The defiant diatom is probably Biddulphia (according to Anne Thessen) and the tintinnid is Ptychocylis obtusa/urnula. From a sample taken in the Canada Basin in August 2013 by Eun Jin Yang.
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Ptychocylis obtusa from the Chukchi Sea
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Ptychocylis obtusa from the Chukchi Sea
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Ptychocylis obtusa from the Chukchi Sea (Station 18 of the Araon Cruise 003)
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Ptychocylis obtusa from the Chukchi in 2012, Ara003 cruise St 50. This elongated morphotype was about half the population.
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Specimen without teeth or serrations on the lorica oral opening. From the Canada Basin in August 2013, cruise Ara04, St. 13.
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Specimen from the Canada Basin in August 2013, cruise Ara04, Station 15.
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From the Canada Basin in August 2013, St 15 of the ARA04 cruise.
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From the Canada Basin in August 2013, cruise ARA04, St 15
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From Station 13 of the ARA04 cruise to the Canada Basin in August 2013
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Image of a Lugol's fixed specimen collected by Diane Stoecker in July 2009 from the Bering Sea
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Ptychocylis obtusa from the Chukchi Sea (St 22 of the cruise Araon 003)
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