Pseudoamphisiella lacazei ( Maupas, 1883 )
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publication ID |
https://doi.org/10.12651/JSR.2025.14.1.038 |
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persistent identifier |
https://treatment.plazi.org/id/D57887FC-FFFF-123E-EB17-F8D2FDDCF9BB |
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treatment provided by |
Felipe |
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scientific name |
Pseudoamphisiella lacazei ( Maupas, 1883 ) |
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2. Pseudoamphisiella lacazei ( Maupas, 1883)
Song, 1996 ( Fig. 2 View Fig , 3 View Fig )
Material examined. Marine water (salinity 33.9‰, temperature 10.5℃) collected from Sodol beach, Jumun-ri , Junumjin-eup , Gangnueng-si, Gangwon-do, South Korea (37°54 ʹ 24 ʺ N, 128°49 ʹ 40 ʺ E) on January 31, 2023 GoogleMaps .
Diagnosis. Size 165-202 × 37-53 μm in vivo and 93- 155 × 34-45 μm after protargol impregnation (n = 11); elliptical body with both ends broadly rounded; cytoplasm colorless; body flexible and slightly contractile ( Fig. 2A- C View Fig ); extrusomes bar shaped, about 2 μm long, loosely distributed throughout the cortex ( Fig. 2D, E View Fig ); adoral zone, composed of 40-52 membranelles, occupies about 30% of body length in staining specimens; two buccal, three frontal, and 1-2 pretransverse cirri, and 13-20 transverse cirri arranged in very long J-shape ( Fig. 2F, H, J, K View Fig ); two midventral rows: right row relatively short, composed of 9-15 cirri; and left row relatively long, composed of 14-21 cirri; one left (23-32 cirri) and one right (23-30) marginal cirral rows ( Fig. 2F, H View Fig ); 11-20 caudal cirri, between posterior ends of marginal rows ( Fig. 2F View Fig ); 9-11 dorsal kineties ( Fig. 2G, I View Fig ); about 50 macronuclear nodules, each 4-12 × 4-5 μm after protargol impregnation; micronucleus not observed ( Fig. 2F View Fig ).
Distribution. Algeria (type locality, Maupas, 1883), Baltic Sea ( Telesh et al., 2009), Brazil (Kattar, 1970), China ( Song et al., 1996), Germany ( Kahl, 1932), USA ( Torch, 1960), Korea (in this study).
Remarks. Up to date, four species are assigned to the genus Pseudoamphisiella , namely, P. alveolata ; P. elongata Li et al., 2010 ; P. lacazei ; and P. quadrinucleata Shen et al., 2008 ( Song, 1996; Song and Warren, 2000; Berger, 2006; Shen et al., 2008; Li et al., 2010). The Korean population of P. lacazei is similar to the Chinese population described by Song (1996) in all aspects except for the presence of pretransverse cirri. Song (1996) reported that the Chinese population of P. lacazei lacks pretransverse cirri, however, the Korean population has usually one and occasionally two pretransverse cirri ( Fig. 2F, H, K View Fig ) ( Song, 1996). Despite this morphological difference, the two populations show a similarity of 99.94% in the 18S rDNA sequence and cluster together with full supporting values (100% ML and 1.00 BI) in the phylogenetic trees ( Fig. 3 View Fig ). However, since the difference between the Chinese and the Korean population is only one nucleotide, the establishment of a new species or subspecies based on the presence (vs. absence) of pretransverse cirri seems not justified at the present state of knowledge. Pseudoamphisiella elongata is most similar to P. lacazei , except for the number of right midventral cirri (15-21 vs. 9-15), caudal cirri (6-7 vs. 11-20), and dorsal kineties (6-7 vs. 9-11) ( Li et al., 2010). Additionally, P. alveolata differs from P. lacazei by the number of left and right marginal cirri (14-20 vs. 23-32 and 12-14 vs. 23-30), and macronuclear nodules (2 vs. about 50) ( Song and Warren, 2000). Also, P. quadrinucleata differs from P. lacazei by the number of adoral membranelles (52-69 vs. 40-52) and macronuclear nodules (4 vs. about 50) ( Shen et al., 2008). Voucher slides. Three slides with protargol-impregnat- ed specimens were deposited at the National Institute of Biological Resources (NIBRPR0000111272, NIBRPR 0000111273, NIBRPR0000111274).
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