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. 2021 Jul 15;12:705826. doi: 10.3389/fmicb.2021.705826

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Copyright © 2021 Shao, Gao, Warren and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Photomicrographs of Quadristicha subtropica n. sp. during morphogenesis, after protargol staining. (A–C) Early morphogenetical stages in ventral views, showing the newly formed oral primordium. (D) Ventral view of early divider, arrow marks the dedifferentiation of cirrus V/4, and double arrowheads indicate the UM-anlage. (E) Ventral view of early divider, arrow shows the frontal-ventral-transverse cirral anlagen, arrowheads mark the dedifferentiation of cirri IV/2 and IV/3, and double arrowheads indicate the UM-anlage. (F,G) Ventral and dorsal view of a divider, arrow in (F) shows frontal-ventral-transverse cirral anlagen, arrowhead marks undulating membranelles anlage, and arrows in (G) show dorsal kineties anlagen. (H) Ventral view of a mid-divider, arrow marks the dorsomarginal kineties anlage. (I) Dorsal view, to denote the fusion of the macronuclear nodules. (J,M) Ventral views, to show the ciliature. Arrows mark the dorsomarginal kinety anlagen. (K) Dorsal views, to demonstrate the development of the macronuclear nodules. (L) Dorsal view, arrows point to the caudal cirri. Bars: 30 μm.