Strombidium capitatum

Mixotrophic, chloroplast retention, nanoflagellates

Cell squat-shaped (truncate); conspicuous peristomial collar; girdle kinety subequatorial, divides conical bottom from hemispherical top; oral cavity wide and deep, APZ and VPZ clearly separated, VPZ distinct and extends 1/3 down the side of the cell; one macronucleus, shape variable, but generally elongate

Body squat in shape (truncate), wide-conical; 40 (30-70) µm long and 40 (30-55) µm wide; conspicuous peristomial collar (Fig 1,2-5,7,10,13), deep ventral groove (Fig 1,3,8,9,13); trichites distinct, possibly in bundles (Fig 1,2). Oral cavity wide and deep (Fig 1,2,8); 15 (14-16) APks and 19 (14-23) VPks; APZ and VPZ clearly separated (Fig 1,3,8,9,13); paroral ciliated; VPZ runs distinctly about 1/3 down the side of the cell (Fig 1,3,8). Girdle kinety subequatorial (Fig 1,8), with stubby cilia, surrounding the cell; ventral kinety extends in longitudinal groove from the girdle to the posterior pole, consists of 5-10 ciliated kinetosomes (Fig 1). One macronucleus, shape variable but mostly elongate and shaped like a question mark (Fig 1,6,7,11,12).

Rotates slowly, interrupted by short jumps

Temperature: 5-24 ºC; eurythermal Salinity: 30-32 ?