Ancyromonas micra ( Cavalier-Smith 2008 ) Heiss et al. 2010

Aydin, Esra Elif & Lee, Won Je, 2012, Free-living Heterotrophic Flagellates from Intertidal Sediments of Saros Bay, Aegean Sea (Turkey), Acta Protozoologica 51 (2), pp. 119-137 : 120-123

Ancyromonas micra ( Cavalier-Smith 2008) Heiss et al. 2010 ( Figs 1c , 2c )

(= Planomonas micra Cavalier-Smith 2008 )

Observation: Gliding flagellate. Cells are oval shaped, 3.5–5 μm long and dorso-ventrally flattened. The cells have a shallow groove ventrally near an anterio-lateral margin of the cell. The cells have a stiff and thikened anterior flagellum emerging from an anterior depression. The posterior flagellum is 1.5–2 times the length of the cell and acronematic. The cells move by gliding with the posterior flagellum trailing. Description based on records of two cells.

Remarks: Recently, detailed studies of this genus were carried out by Heiss et al. (2010, 2011) and Cavalier-Smith et al. (2008). According to Heiss et al. (2010), Ancyromonas has a junior synonym, Planomonas Cavalier-Smith 2008 and contains 7 nominal species: 5 marine – A. sigmoides , A. cephalopora , A. melba , A. sinistra , A. micra , 2 freshwater – A. howeae , A. limna . We assign our cells to Ancyromonas micra because our observations are in agreement with those of Cavalier-Smith et al. (2008) under the name of Planomonas micra . It is similar to A. melba Simpson and Patterson 1996 , A. magna Zhang and Yang 1993 and A. sinistra Al-Qassab et al. 2002 . Ancyromonas micra differs from A. melba because A. melba is larger. Ancyromonas micra is distinguished from A. sinistra because A. sinistra has a margin with the presumptive extrusomes and the cell body is flatter. This species is very similar to A. sigmoides , but can be distinguished because A. micra has a thicker anterior flagellum and a bigger rostrum. Due to their morphological similarity, Ancyromonas micra might have been reported elsewhere under the name A. sigmoides . Ancyromonas micra can be distingushed from a freshwater species A. howeae and A. limna by its thicker anterior flagellum and because A. howeae has a contractile vacuole.

Figures

Fig. 1. a – Actinomonas mirabilis/Pteridomonas danica; b – Amastigomonas mutabilis; c – Ancyromonas micra; d – Bicosoeca conica; e – Bordnamonas tropicana; f – Caecitellus parvulus; g – Cafeteria minuta; h – Cafeteria roenbergensis; i – Cyranomonas australis; j – Developayella elegans; k – Discocelis saleuta; l – Goniomonas amphinema; m – Goniomonas pasifica; n – Kiitoksia ystava; o – Dinema platysomum; p – Anisonema acinus; q – Heteronema exaratum; r – Heteronema ovale; s – Kathablepharis remigera; t – Notosolenus canellatus; u – Massisteria marina; v – Metromonas grandis; w – Neobodo designis; x – Neobodo saliens; y – Percolomonas similis. Scale bar: 10 μm for all figures.

Fig. 2. a – Actinomonas mirabilis/Pteridomonas danica; b – Amastigomonas mutabilis; c – Ancyromonas micra; d – Bicosoeca conica; e – Caecitellus parvulus, note the mouth on the left-hand side; f – Bordnamonas tropicana; g – Cafeteria roenbergensis; h – Cyranomonas australis; i – Developayella elegans; j – Discocelis saleuta; k – Goniomonas amphinema; l – Cafeteria minuta, feeding cell; m – Anisonema acinus, dorsal view, note the ingestion organelle; n – Dinema platysomum, ventral view showing surface striations; o – Goniomonas pacifica; p – Heteronema exaratum, ventral view, general appearance of cell; q – Kathablepharis remigera; r – Massisteria marina; s – Neobodo saliens; t – Neobodo designis; u–v – Heteronema ovale, same cell; u – general appearance; v – extended cell. All micrographs are DIC images. Scale bar: 5 μm for all figures.