Two new species in the Chaetoceros socialis complex (Bacillariophyta) : C. sporotruncatus and C. dichatoensis, and characterization of its relatives, C. radicans and C. cinctus

© 2017 Phycological Society of America.

Détails bibliographiques
Publié dans:Journal of phycology. - 1966. - 53(2017), 4 vom: 24. Aug., Seite 889-907
Auteur principal: Gaonkar, Chetan C (Auteur)
Autres auteurs: Kooistra, Wiebe H C F, Lange, Carina B, Montresor, Marina, Sarno, Diana
Format: Article en ligne
Langue:English
Publié: 2017
Accès à la collection:Journal of phycology
Sujets:Journal Article Research Support, Non-U.S. Gov't Chaetoceros Chaetoceros dichatoensis sp. nov. Chaetoceros sporotruncatus sp. nov. diatoms phylogeny spores taxonomy DNA, Algal plus... RNA, Ribosomal, 18S RNA, Ribosomal, 28S
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520 |a © 2017 Phycological Society of America. 
520 |a The diatom genus Chaetoceros is one of the most abundant and diverse phytoplankton in marine and brackish waters worldwide. Within this genus, Chaetoceros socialis has been cited as one of the most common species. However, recent studies from different geographic areas have shown the presence of pseudo-cryptic diversity within the C. socialis complex. Members of this complex are characterized by curved chains (primary colonies) aggregating into globular clusters, where one of the four setae of each cell curves toward the center of the cluster and the other three orient outwards. New light and electron microscopy observations as well as molecular data on marine planktonic diatoms from the coastal waters off Chile revealed the presence of two new species, Chaetoceros sporotruncatus sp. nov. and C. dichatoensis. sp. nov. belonging to the C. socialis complex. The two new species are similar to other members of the complex (i.e., C. socialis and C. gelidus) in the primary and secondary structure of the colony, the orientation pattern of the setae, and the valve ultrastructure. The only morphological characters that can be used to differentiate the species of this complex are aspects related to resting spore morphology. The two newly described species are closely related to each other and form a sister clade to C. gelidus in molecular phylogenies. We also provide a phylogenetic status along with the morphological characterization of C. radicans and C. cintus, which are genetically related to the C. socialis complex 
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650 4 |a Chaetoceros 
650 4 |a Chaetoceros dichatoensis sp. nov. 
650 4 |a Chaetoceros sporotruncatus sp. nov. 
650 4 |a diatoms 
650 4 |a phylogeny 
650 4 |a spores 
650 4 |a taxonomy 
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650 7 |a RNA, Ribosomal, 18S  |2 NLM 
650 7 |a RNA, Ribosomal, 28S  |2 NLM 
700 1 |a Kooistra, Wiebe H C F  |e verfasserin  |4 aut 
700 1 |a Lange, Carina B  |e verfasserin  |4 aut 
700 1 |a Montresor, Marina  |e verfasserin  |4 aut 
700 1 |a Sarno, Diana  |e verfasserin  |4 aut 
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