Aspidisca polystyla Stein, 1859

Choi, Ji Hye & Jung, Atef Omar and Jae-Ho, 2023, New record of three Aspidisca species (Protozoa, Ciliophora) from South Korea, Journal of Species Research 12 (1), pp. 90-94 : 93-94

publication ID

https://doi.org/ 10.12651/JSR.2023.12.1.090

persistent identifier

https://treatment.plazi.org/id/C57F879B-8B74-FF88-FF13-FA9EFE29FE2C

treatment provided by

Felipe

scientific name

Aspidisca polystyla Stein, 1859
status

 

3. Aspidisca polystyla Stein, 1859 View in CoL ( Fig. 3 View Fig )

Material examined. Marine water (salinity 40.0‰, temperature 11.1℃) collected from Anin Beach , Gangdong-myeon , Gangneung-si, Gangwon-do, Korea (37° 44 ʹ 3 ʺ N, 128°59 ʹ 25 ʺ E) on February 28, 2022 GoogleMaps .

Diagnosis. Size 31 - 38 × 26 - 28 μm in vivo and 28 - 37 × 22 - 29 μm after protargol impregnation (n = 8); body shape broadly rotund; cortex rigid, without the peristomial spur and projections along left margin; AZM1 about 2 μm long invariably with 4 membranelles, AZM2 about 10 μm long after protargol impregnation and with 11 - 14 membranelles; 7 frontoventral cirri in “ polystyla -arrangement”; 5 transverse cirri, ( Fig. 3A, C, D View Fig ), transverse cirrus 1 (leftmost) splits into 2 or 3 parts, cirri 2, 3, and 5 usually split into 2 parts, transverse cirrus 4 consists of one or two parts; 4 dorsal kineties with 8 - 9, 8 - 10, 8 - 12, and 9 - 10 dikinetids in dorsal kineties 1 - 4, respectively ( Fig. 3B, E View Fig ); cytoplasm colorless; 1 horseshoe-shaped macronucleus, micronucleus not observed.

Distribution. Italy, Baltic Sea, South Korea.

Remarks. Within the genus Aspidisca , A. polystyla seems to possess the highest number of transverse cirri. Stein (1859) reported that A. polystyla has 10 - 12 transverse cirri. Other investigations suggest that it has up to 15 transverse cirri (Plough, 1915; Tuffrau, 1964). However, Kahl (1932) reported that A. polystyla has 5 - 6 transverse cirri but it looks like it has higher number of transverse cirri because each transverse cirrus splits into two or more parts. According to our observations on the protargol-impregnated specimens of the Korean population ( Fig. 3D View Fig ), A. polystyla has only five transverse cirri, although it looks like it has eleven or more in vivo ( Fig. 3C View Fig ), suggesting that the split occurs only in the cilia while the bases of cirri are ordinary. Other members of genus Aspidisca , which have seven frontoventral cirri in “ polystyla -arrangement” and without the peristomial spur ( A. major (Madsen, 1931) Kahl, 1932 , A. steini ), can be easily separated from A. polystyla . Aspidisca major differs from A. polystyla by the larger body size (60 - 90 μm vs. 31 - 38 × 26 - 28 μm) ( Kahl, 1932), the ordinary (vs. separated) transverse, and the two (vs. 1) macronuclear nodules ( Wu and Curds, 1979). Also, the Chinese population of A. steini is most similar to A. polystyla , but A. steini differs from A. polystyla by the transverse cirri (the leftmost cirri separated into two parts vs. almost all cirri separated into 1 - 3 parts) ( Wu and Curds, 1979; Song and Wilber, 1997).

Voucher slides. Three slides with protargol-impregnat- ed specimens were deposited at the National Marine Biodiversity Institute of Korean (MABIK PR00044191, PR00044192, and PR00044193).

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