scholarly journals Unravelling spiral cleavage

Development ◽  
2020 ◽  
Vol 147 (1) ◽  
pp. dev181081 ◽  
Author(s):  
José M. Martín-Durán ◽  
Ferdinand Marlétaz
Keyword(s):  
1989 ◽  
Vol 27 ◽  
pp. 19
Author(s):  
M.J.M. de Boer ◽  
A. Lindenmayer
Keyword(s):  

2012 ◽  
Vol 12 (1) ◽  
pp. 11 ◽  
Author(s):  
Julia Merkel ◽  
Tim Wollesen ◽  
Bernhard Lieb ◽  
Andreas Wanninger
Keyword(s):  

Development ◽  
2002 ◽  
Vol 129 (3) ◽  
pp. 719-732 ◽  
Author(s):  
Françoise Z. Huang ◽  
Dongmin Kang ◽  
Felipe-Andres Ramirez-Weber ◽  
Shirley T. Bissen ◽  
David A. Weisblat

In leech embryos, segmental mesoderm and ectoderm arise from teloblasts by lineages that are already relatively well characterized. Here, we present data concerning the early divisions and the definitive fate maps of the micromeres, a group of 25 small cells that arise during the modified spiral cleavage in leech (Helobdella robusta) and contribute to most of the nonsegmental tissues of the adult. Three noteworthy results of this work are as follows. (1) The c′′′ and dm′ clones (3d and 3c in traditional nomenclature) give rise to a hitherto undescribed network of fibers that run from one end of the embryo to the other. (2) The clones of micromeres b′′ and b′′′ (2b and 3b in traditional nomenclature) die in normal development; the b′′ clone can be rescued to assume the normal c′′ fate if micromere c′′ or its clone are ablated in early development. (3) Two qualitative differences in micromere fates are seen between H. robusta (Sacramento) and another Helobdella sp. (Galt). First, in Helobdella sp. (Galt), the clone of micromere b′′ does not normally die, and contributes a subset of the cells arising exclusively from c′′ in H. robusta (Sacramento). Second, in Helobdella sp. (Galt), micromere c′′′ makes no definitive contribution, whereas micromere dm′ gives rise to cells equivalent to those arising from c′′′ and dm′ in H. robusta (Sacramento).


2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Reiko Kuroda ◽  
Kohei Fujikura ◽  
Masanori Abe ◽  
Yuji Hosoiri ◽  
Shuichi Asakawa ◽  
...  

1995 ◽  
Vol 46 (1-2) ◽  
pp. 8-21 ◽  
Author(s):  
André E. Van Loon ◽  
Wim G.M. Damen ◽  
Jo A.M. Van Den Biggelaar
Keyword(s):  

Zootaxa ◽  
2017 ◽  
Vol 4238 (4) ◽  
pp. 594
Author(s):  
CLAUS NIELSEN

Several species of solitary entoprocts of the genera Loxosoma and Loxosomella occur on maldanid polychaetes or in their tubes (Nielsen 1964). New species turn up almost every time maldanids from new localities are studied, and the species described below has been the subject of a study of spiral cleavage (Merkel et al. 2012). This paper describes a new species of Loxosomella from tubes of the maldanid polychaete Axiothella rubrocincta (Johnson, 1901) from False Bay, San Juan Island, WA, USA. 


2017 ◽  
Vol 145 ◽  
pp. S60
Author(s):  
Yu-Wen Hsieh ◽  
Mette Handberg-Thorsager ◽  
Pavel Tomancak

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