Strombidium montagnesi, Xu & Song & Warren, 2006

Xu, Dapeng, Song, Weibo & Warren, Alan, 2006, Morphology and infraciliature of two new species of marine oligotrich ciliates (Ciliophora: Oligotrichida) from China, Journal of Natural History 40 (21 - 22), pp. 1287-1299 : 1294-1296

Strombidium montagnesi nov. sp.

( Figures 3 , 4 ; Table I)

Diagnosis Small marine Strombidium , 30× 20 mm in vivo with truncated conical cell shape and conspicuous equatorial ridge; hemitheca covering the posterior one-quarter to one-third of the cell; dorsoventrally flattened ca 2:3; about 21 anterior membranelles and six ventral membranelles; girdle kinety located in posterior one-quarter to one-third of the cell and has 25–27 dikinetids, while ventral kinety has 6–12 dikinetids; extrusomes ca 5 mm long, arranged along girdle kinety; single ellipsoidal macronucleus centrally positioned.

Dedication

We dedicate this new species to Dr David J. S. Montagnes, University of Liverpool, UK, for his great contribution to the taxonomy and ecology of planktonic ciliates.

Type location

Figures

Figure 3. Strombidium montagnesi nov. sp. from life (A–D) and after protargol impregnation (E–I). (A) Ventral view of a typical individual, arrows indicate the ridge along equatorial region; (B) extrusomes; (C) ventral view, to show different cell shape; (D) right side view to show the dorsoventrally flattened cell shape, arrows mark the ridge along subequatorial region; (E) ventral view of an early divider, arrow marks the oral primordium; (F) pattern of somatic ciliature; (G, H) ventral and dorsal views showing ciliary pattern; (I) ventral view of an early divider. AM, anterior membranelles; AP, apical protrusion; EM, new endoral membrane; GK, girdle kinety; Ma, macronucleus; VK, ventral kinety; VM, ventral membranelles. Scale bars: 15 mm (A, G, H); 3 mm (B).

Figure 4. Photomicrographs of Strombidium montagnesi nov. sp. from life (A–E) and after protargol impregnation (F–J). (A) Ventral view of a representative specimen, arrows indicate the ridge along equatorial region; (B) lateral view, arrows mark the ridge along subequatorial region; (C) to show the cilia of the ventral kinety (arrows); (D) arrows mark the edge of the transparent hemitheca; (E) to show different cell shape, the flame-shaped anterior membranelles when cell is at rest, and the densely arranged extrusomes; (F) ventral view, to show the oral primordium (arrowhead) and the girdle kinety (arrows); (G) to show the macronucleus and the nucleoli; (H) dorsal view, arrows indicate the girdle kinety; (I) to show the oral primordium; (J) to show the ventral kinety (arrowheads). Scale bars: 15 mm (A, B, E); 10 mm (F); 20 mm (G, J).