FIG 5.

Phylogeny, morphology, and distribution of the dominant cryptophyte in this study. (A) Maximum-likelihood phylogeny of 18S rRNA genes from cryptophytes within the Teleaulax/Plagioselmis/Geminigera lineage, revealing the position of the WAP cryptophyte clone sequence (in bold). Taxon names are taken directly from GenBank and include strain identifiers and accession numbers. Environmental sequences are named by their location or as “environmental” when the location could not be determined. Symbols represent key morphological traits. The right-hand colored bar signifies the latitude at which the sequence-containing sample was taken (or the latitude of isolation for sequences from cultured representatives). Potential clades are highlighted and identified with a roman numeral. (B) Map of the Antarctic continent with stations where full-length cryptophyte sequences originated, either as cultured isolates or environmental samples. (C) Scanning electron microscopy (SEM) images of the WAP cryptophyte where the external morphological features can be appreciated.