TY - JOUR

T1 - The morphology and phylogeny of the diatom genera Rhizosolenia, Proboscia, Pseudosolenia and Neocalyptrella from Gulf of Thailand and the Andaman Sea, with description of Rhizosolenia loanicola sp. nov., Proboscia siamensis sp. nov. and Probosciales ord. nov.

AU - Boonprakob, Atchaneey

AU - Lundholm, Nina

AU - Medlin, Linda K.

AU - Moestrup, Øjvind

N1 - Publisher Copyright: © 2021 The International Society for Diatom Research.

PY - 2021

Y1 - 2021

N2 - The marine planktonic diatom genera Rhizosolenia, Proboscia, Pseudosolenia and Neocalyptrella have been studied with emphasis on morphology and phylogeny. Material was collected October 2008—January 2011 at seven localities in the four provinces of the marine coastal waters of Thailand: Rayong, Chonburi, Chumphon and Phuket. Fifty strains were established in culture and used for morphological and phylogenetic analyses, complemented with morphological studies of field material. Morphological studies were done using light microscopy, scanning and transmission electron microscopy. Ten species and two varieties of Rhizosolenia were identified and described in detail: R. styliformis, R. acuminata, R. bergonii, R. clevei var. clevei, R. clevei var. communis, R. formosa, R. hyalina, R. imbricata, R. ostenfeldii, R. aff. pungens, R. setigera and R. loanicola sp. nov. Pseudosolenia calcaravis was also found, and detailed studies indicated that this taxon formed a species complex. Proboscia was represented by P. indica and P. siamensis sp. nov., but more species probably exist. Neocalyptrella was represented by N. robusta. The molecular studies supported Pseudosolenia, Proboscia and Neocalyptrella as separate genera. Culturing and molecular analyses were often difficult or unsuccessful. The data show that Rhizosolenia can be a monophyletic genus if R. pungens and R. setigera, which are distantly related to the remaining Rhizosolenia species, are described as a new genus. This will be done in a companion study of the type material of R. setigera.

AB - The marine planktonic diatom genera Rhizosolenia, Proboscia, Pseudosolenia and Neocalyptrella have been studied with emphasis on morphology and phylogeny. Material was collected October 2008—January 2011 at seven localities in the four provinces of the marine coastal waters of Thailand: Rayong, Chonburi, Chumphon and Phuket. Fifty strains were established in culture and used for morphological and phylogenetic analyses, complemented with morphological studies of field material. Morphological studies were done using light microscopy, scanning and transmission electron microscopy. Ten species and two varieties of Rhizosolenia were identified and described in detail: R. styliformis, R. acuminata, R. bergonii, R. clevei var. clevei, R. clevei var. communis, R. formosa, R. hyalina, R. imbricata, R. ostenfeldii, R. aff. pungens, R. setigera and R. loanicola sp. nov. Pseudosolenia calcaravis was also found, and detailed studies indicated that this taxon formed a species complex. Proboscia was represented by P. indica and P. siamensis sp. nov., but more species probably exist. Neocalyptrella was represented by N. robusta. The molecular studies supported Pseudosolenia, Proboscia and Neocalyptrella as separate genera. Culturing and molecular analyses were often difficult or unsuccessful. The data show that Rhizosolenia can be a monophyletic genus if R. pungens and R. setigera, which are distantly related to the remaining Rhizosolenia species, are described as a new genus. This will be done in a companion study of the type material of R. setigera.

KW - marine planktonic rhizosolenioid diatoms

KW - morphology

KW - phylogeny

KW - taxonomy

KW - Thailand

U2 - 10.1080/0269249X.2021.1957719

DO - 10.1080/0269249X.2021.1957719

M3 - Journal article

AN - SCOPUS:85118261351

VL - 36

SP - 143

EP - 184

JO - Diatom Research

JF - Diatom Research

SN - 0269-249X

IS - 3

ER -