2
Key features Body truncate to conical, posterior end pointed, anterior end forms dome, no peristomial collar; APZ distinctly separated from VPZ; girdle supraequatorial; one oval to spherical macronucleus; dark staining extrusomes Measurements Length: 40 (20-55) μm Width: 40 (20-50) μm No of APk: 15 (12-18) No of VPk: 11 (9-22) Ma diameter: 9 (8-15) μm Biovolume: 35,000 μm 3 Movement - Food Mixotrophic, chloroplast-retention; autotrophic flagellates Ecological data Temperature: 7-20 ˚C Salinity: 24-32 ‰ References Kahl A 1932; Leegaard C 1915; Lynn DH et al. 1988; Montagnes DJS et al. 1988 Fig 1 Line drawings of protargol stained cell, showing kineties, oral structures, extrusomes, and nucleus. Fig 2 Lugol’s fixed cell, showing anterior dome shape. Fig 4 Lugol’s fixed and DAPI stained cell, illustrating nuclear shape; cell shape not preserved. Fig 5 SEM of Lugol’s fixed cell with extruded trichites (Tr). Fig 6-8 Protargol stains, lateral view, showing distinct extrusomes (E), the girdle kinety (G), and the macronucleus (Ma). Page 1 of 2 6 4 2 1 Strombidium acutum (Leegaard, 1915) Kahl, 1932 Ma G APk of APZ PO 20 μm 20 μm Guide to UK Coastal Planktonic Ciliates © 2001 DJS Montagnes, University of Liverpool http://www.liv.ac.uk/ciliate 20 μm 5 20 μm 3 20 μm E CS VPk of VPZ extruded extrusomes APZ CS VPZ APZ Tr APZ E Ma CS Ma 9 8 20 μm G E APZ 7 20 μm VPZ Ma APZ E food vacuoles n/a n/a

Strombidium acutum (Leegaard, 1915) Kahl, 1932zooplankton.cn/ciliate/Datasheets/s_acut/s_acut.pdf · Cell truncate to conical, 40 (20-55) µm long and 40 (20-50) µm wide; posterior

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Page 1: Strombidium acutum (Leegaard, 1915) Kahl, 1932zooplankton.cn/ciliate/Datasheets/s_acut/s_acut.pdf · Cell truncate to conical, 40 (20-55) µm long and 40 (20-50) µm wide; posterior

Key featuresBody truncate to conical, posterior end pointed, anteriorend forms dome, no peristomial collar; APZ distinctlyseparated from VPZ; girdle supraequatorial; one ovalto spherical macronucleus; dark staining extrusomes

MeasurementsLength: 40 (20-55) µmWidth: 40 (20-50) µmNo of APk: 15 (12-18)No of VPk: 11 (9-22)Ma diameter: 9 (8-15) µmBiovolume: 35,000 µm3

Movement-

FoodMixotrophic, chloroplast-retention; autotrophicflagellates

Ecological dataTemperature: 7-20 ˚CSalinity: 24-32 ‰

ReferencesKahl A 1932; Leegaard C 1915; Lynn DH et al. 1988;Montagnes DJS et al. 1988

Fig 1 Line drawings of protargol stained cell, showing kineties,oral structures, extrusomes, and nucleus. Fig 2 Lugol’s fixedcell, showing anterior dome shape. Fig 4 Lugol’s fixed andDAPI stained cell, illustrating nuclear shape; cell shape notpreserved. Fig 5 SEM of Lugol’s fixed cell with extruded trichites(Tr). Fig 6-8 Protargol stains, lateral view, showing distinctextrusomes (E), the girdle kinety (G), and the macronucleus(Ma).

Page 1 of 2

6

4

2

1

Strombidium acutum (Leegaard, 1915) Kahl, 1932

Ma

G

APkof APZ

PO

20 µm

20 µm

Guide to UK Coastal Planktonic Ciliates © 2001 DJS Montagnes, University of Liverpool http://www.liv.ac.uk/ciliate

20 µm

5

20 µm

320 µmE

CS

VPkof VPZ

extruded extrusomes APZ

CS

VPZ

APZ

Tr

APZ

E

Ma

CS

Ma

98 20 µm

G

E

APZ

7 20 µm

VPZ

Ma

APZ

Efoodvacuoles

n/a

n/a

Page 2: Strombidium acutum (Leegaard, 1915) Kahl, 1932zooplankton.cn/ciliate/Datasheets/s_acut/s_acut.pdf · Cell truncate to conical, 40 (20-55) µm long and 40 (20-50) µm wide; posterior

Guide to UK Coastal Planktonic Ciliates © 2001 DJS Montagnes, University of Liverpool http://www.liv.ac.uk/ciliate Page 2 of 2

Species descriptionCell truncate to conical, 40 (20-55) µm long and 40(20-50) µm wide; posterior end pointed, anteriorend forms a dome shape (Fig 1,2,6); the largeextrusomes are distinct in protargol stained cells, theycan be numerous to absent and insert anterior to thegirdle and extend posteriorly and internally (Fig 1,6-8).

Shallow oral cavity; APZ distinctly separated fromVPZ; paroral kinety in the upper right surface of oralgroove - not visible in Lugol’s fixed cells (Fig 1).

Girdle kinety supraequatorial, completely surroundingthe cell, with very short cilia (Fig 1, 7,8).

One spherical to oval macronucleus, 9 (8-15) µmin diameter, centrally located (Fig 1,4,6-8).

Similar speciesStrombidium reticulatum (anterior protuberance), S.compressum (less APks, APZ and VPZ not so clearlyseparated, small trichites), S. conicoides (more APks)S. basiomorphum (no distinct extrusomes, long ventralkinety present).

List of synonyms-

Taxonomical remarks-

Notes

Strombidium acutum (Leegaard, 1915) Kahl, 1932


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