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Cell Morphology and Formal Description of Ergobibamus cyprinoides n. g., n. sp., Another Carpediemonas ‐Like Relative of Diplomonads
Author(s) -
PARK JONG SOO,
KOLISKO MARTIN,
SIMPSON ALASTAIR G.B.
Publication year - 2010
Publication title -
journal of eukaryotic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 1066-5234
DOI - 10.1111/j.1550-7408.2010.00506.x
Subject(s) - biology , synapomorphy , ultrastructure , microtubule , flagellum , basal body , anatomy , organelle , dorsum , botany , clade , phylogenetics , gene , microbiology and biotechnology , genetics
. About 20 new isolates of Carpediemonas ‐like organisms (CLOs) have been reported since 2006. Small subunit rRNA gene phylogenies divide CLOs into six major clades: four contain described exemplars (i.e. Carpediemonas, Dysnectes, Hicanonectes , and Kipferlia ), but two include only undescribed organisms. Here we describe a representative of one of these latter clades as Ergobibamus cyprinoides n. g., n. sp., and catalogue its ultrastructure. Ergobibamus cyprinoides is a bean‐shaped biflagellated cell, 7–11.5 μm long, with a conspicuous groove. Instead of classical mitochondria there are cristae‐lacking rounded organelles 300–400 nm in diameter. The posterior flagellum has a broad ventral vane and small dorsal vane. There are normally four basal bodies, two non‐flagellated. There is one anterior root (AR), containing six microtubules. The posterior flagellar apparatus follows the “typical excavate” pattern of a splitting right root supported by fibres “I,”“B,” and “A,” a “composite” fibre, a singlet root, and a left root (LR) with a “C” fibre. The B fibre originates against the LR—a synapomorphy of the taxon Fornicata—supporting the assignation of Ergobibamus to Fornicata, along with diplomonads, retortamonads, and other CLOs. Distinctive features of E. cyprinoides include the complexity of the AR, which is intermediate between Hicanonectes , and Carpediemonas and Dysnectes , and a dorsal extension of the C fibre.