@article{fdi:010085281, title = {{A}ncient {T}ethyan vicariance and long-distance dispersal drive global diversification and cryptic speciation in the red seaweed {P}terocladiella}, author = {{B}oo, {G}. {H}. and {L}eliaert, {F}. and {L}e {G}all, {L}. and {C}oppejans, {E}. and {D}e {C}lerck, {O}. and {V}an {N}guyen, {T}. and {P}ayri, {C}laude and {M}iller, {K}. {A}. and {Y}oon, {H}. {S}.}, editor = {}, language = {{ENG}}, abstract = {{W}e investigated the globally distributed red algal genus {P}terocladiella, comprising 24 described species, many of which are economically important sources of agar and agarose. {W}e used {DNA}-based species delimitation approaches, phylogenetic, and historical biogeographical analyses to uncover cryptic diversity and infer the drivers of biogeographic patterns. {W}e delimited 43 species in {P}terocladiella, of which 19 are undescribed. {O}ur multigene time-calibrated phylogeny and ancestral area reconstruction indicated that {P}terocladiella most likely originated during the {E}arly {C}retaceous in the {T}ethys {S}ea. {A}ncient {T}ethyan vicariance and long-distance dispersal have shaped current distribution patterns. {T}he ancestor of {E}astern {P}acific species likely arose before the formation of the formidable {E}astern {P}acific {B}arrier-a first confirmation using molecular data in red algae. {D}ivergences of {N}ortheast and {S}outheast {P}acific species have been driven by the {C}entral {A}merican {S}eaway barrier, which, paradoxically, served as a dispersal pathway for {A}tlantic species. {B}oth long- and short-distance dispersal scenarios are supported by genetic relationships within cosmopolitan species based on haplotype analysis. {A}symmetrical distributions and the predominance of peripatry and sympatry between sister species suggest the importance of budding speciation in {P}terocladiella. {O}ur study highlights the underestimation of global diversity in these crucial components of coastal ecosystems and provides evidence for the complex evolution of current species distributions.}, keywords = {biogeography ; {E}astern {P}acific {B}arrier ; {G}elidiales ; molecular dating ; overlooked biodiversity ; sister species ; {T}ethyan origin ; {PACIFIQUE}}, booktitle = {}, journal = {{F}rontiers in {P}lant {S}cience}, volume = {13}, numero = {}, pages = {849476 [17 p.]}, ISSN = {1664-462{X}}, year = {2022}, DOI = {10.3389/fpls.2022.849476}, URL = {https://www.documentation.ird.fr/hor/fdi:010085281}, }