4.2 Article

Three new cryptogenic species in the tribes Polysiphonieae and Streblocladieae (Rhodomelaceae, Rhodophyta)

期刊

PHYCOLOGIA
卷 56, 期 6, 页码 605-623

出版社

TAYLOR & FRANCIS LTD
DOI: 10.2216/17-17.1

关键词

Cox1; Introduction vectors; Melanothamnus; Melanothamnus pseudoforcipatus sp nov.; Non-native; Polysiphonia; Polysiphonia delicata sp nov.; Polysiphonia radiata sp nov.; rbcL; New species

资金

  1. postdoctoral programmes Axudas de apoio a etapa inicial de formacion posdoutoral do Plan I2C (Xunta de Galicia)
  2. Diputacion da Coruna
  3. Spanish Government [1541S/2015]
  4. Australian Biological Resources Study [RFL213-08]
  5. Australian Research Council [FT110100585]
  6. Holsworth Foundation

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During our sampling surveys of the tribes Polysiphonieae and Streblocladieae in Spain and Australia, three previously unrecorded species were collected. Based on molecular and morphological evidence they are proposed as new species. Polysiphonia delicata sp. nov. and Polysiphonia radiata sp. nov. belong to the Polysiphonieae and share the synapomorphy in this group, rhizoids in open connection to pericentral cells. They differ from other members of this group either by rbcL sequence divergences greater than 4.5% and/or by morphological characters. The third species is placed in Melanothamnus (tribe Streblocladieae), as Melanothamnus pseudoforcipatus sp. nov. In agreement with the morphological delineation of the genus, it has plastids lying only on the radial walls of pericentral cells. It can be separated from most other members of the genus by having naked segments between trichoblasts or branches and/or rbcL sequence divergences higher than 4%. In Galicia, Spain, both Polysiphonia species were mainly collected in marinas, while M. pseudoforcipatus was found at a site close to oyster aquaculture facilities. Polysiphonia delicata was also found in Victoria, Australia, and the potentially non-native status of these three species in relation to their known distribution is discussed.

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