Polystichothrix monilata, Luo & Gao & Yi & Pan & Al-Farraj & Warren, 2017
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publication ID |
https://doi.org/10.1111/zoj.12451 |
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persistent identifier |
https://treatment.plazi.org/id/070387C8-D63E-050B-4E4F-23A5D9F5FB55 |
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treatment provided by |
Plazi |
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scientific name |
Polystichothrix monilata |
| status |
sp. nov. |
POLYSTICHOTHRIX MONILATA SP. NOV. ( FIGS 1A – G View Figure 1 , 2A – T; TABLE 1)
Diagnosis
Body flexible; 125 – 155 9 25 – 35 lm in vivo; citrine-yellow cortical granules about 1 lm in diameter; about 35 adoral membranelles; one buccal cirrus, one anterior and one posterior frontal row with a frontoventral cirrus to the left of them; four or five postoral ventral cirri; four or five ventral rows; two pretransverse ventral cirri; c. seven transverse cirri; on average 37 left and 38 right marginal cirri; five dorsal kineties, dorsal kinety 4 starting at level of buccal vertex; about eight macronuclear segments; two micronuclei; brackish water habitat.
Type locality and ecology
Zhanjiang Mangrove National Nature Reserve (21 ° 55 0 N, 109 ° 75 0 E), Guangdong Province, China. Water temperature 23 ° C, salinity 15 psu .
Type specimens
A protargol slide containing the holotype specimen (see Figs 1B, C View Figure 1 , 2J, K; registration no. LXT2013120701 /1) and one paratype slide (registration no. LXT2013120701 /2) were deposited in the Laboratory of Protozoology , Ocean University of China ( OUC) . A second paratype slide was deposited in the Natural History Museum , London (registration number NHMUK 2015.7.10.1) .
Etymology
The species-group name monilata is a composite of the Latin noun ‘monile’ (necklace) and the suffix ‘ata’ (having a feature) and refers to the moniliform macronucleus.
Description
Body 125 – 155 9 25 – 35 lm in vivo, flexible but not contractile, sometimes slightly twisted, elongate, generally elliptical in outline with both ends rounded and head region slightly bent to left. Ratio of length to width about 5:1, dorsoventrally flattened about 2:1 with ventral side flat and dorsal side bulging evenly when viewed laterally ( Figs 1A View Figure 1 , 2A – E). Anterior end with a conspicuous transparent, thin collar. Adoral zone occupying about 28% of body length ( Figs 1A View Figure 1 , 2A – D). Buccal cavity wide, right margin of cavity in mid-cell region. Pellicle thin and flexible. Cortical granules citrine-yellow, spherical, approximately 1 lm in diameter, rendering cell citrine-brownish at low magnification ( Fig. 2A – E, H). Several cortical granules grouped together around dikinetids, arranged in short rows between dorsal kineties and cirral rows ( Figs 1E, F View Figure 1 , 2G). Cytoplasm colourless, usually packed with granules (1 – 5 lm in diameter), and food vacuoles usually containing diatoms and sometimes small ciliates ( Fig. 2I, L, T). Contractile vacuole not observed. Locomotion by slowly crawling on substrate and amongst debris, or occasionally by swimming in water.
Cilia of anterior membranelles approximately 15 lm long in vivo. All cirri on ventral side about 10 – 12 lm long except the stronger frontal cirri, which have cilia about 15 lm long, and the transverse cirri, which are about 15 – 20 lm long and project beyond posterior cell margin.
Infraciliature as shown in Figures 1B – D, G View Figure 1 , 2J – T. Adoral zone composed of 27 – 41 membranelles, distal end of adoral zone extending far onto right-ventral side of cell (Distal End of adoral zone-value c. 0.4; Berger, 1999, 2006). Bases of membranelles unequal in length, those in distal part comprise three short, equal-length rows of kinetosomes, those in proximal part with four rows, one short and three long ( Figs 1B, G View Figure 1 , 2J, L). Undulating membranes more or less in Oxytricha -pattern; paroral and endoral membranes almost equal in length, slightly curved and optically intersect in posterior third; endoral membrane with single-rowed kinetosomes, starting at midpoint of buccal field; paroral with multiple-rowed kinetosomes, commencing ahead of endoral ( Fig. 1B, G View Figure 1 ). Constantly three enlarged frontal cirri, rightmost one just behind distal end of adoral zone; single buccal cirrus right of paroral membrane ( Figs 1B, G View Figure 1 , 2F, J, L). Two frontal rows; anterior row composed of five to eight cirri, posterior row four to six cirri. One frontoventral cirrus located left of posterior end of anterior frontal row ( Figs 1B, G View Figure 1 , 2J). Four or five short ventral cirri rows, each composed of three to eight cirri. Four or five sparsely distributed postoral ventral cirri located left of ventral cirral rows, anterior-most one just behind buccal vertex ( Figs 1B, D, G View Figure 1 , 2R – T). Six to eight transverse cirri arranged in J-shaped row; two fine pretransverse ventral cirri located close to transverse cirri ( Figs 1B, D, G View Figure 1 , 2P, Q). Two marginal rows, almost confluent posteriorly. Right marginal row composed of 32 – 44 cirri, commencing near anterior end of anterior frontal row; left marginal row composed of 32 – 41 cirri, starting about level with posterior end of paroral membrane ( Figs 1B, G View Figure 1 , 2J). Five dorsal kineties; dorsal kinety 4 commences at about level of buccal vertex, the other four extend almost entire body length; dorsal bristles about 4 lm long in vivo ( Figs 1B, C View Figure 1 , 2K, M – O). Strong fibres associated with cirri are visible in protargol-stained specimens; pharyngeal fibres extremely strong, extending posteriorly and occupying about one-third of body length ( Figs 1G View Figure 1 , 2T). Macronucleus left of cell median, moniliform, usually composed of eight globular to ellipsoidal segments; consistently two ellipsoidal micronuclei ( Figs 1C, G View Figure 1 , 2J, L, M, P).
ORDER STICHOTRICHIDA View in CoL FAURE- FREMIET, 1961 FAMILY AMPHISIELLIDAE JANKOWSKI, 1979 View in CoL
| NHMUK |
Natural History Museum, London |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Polystichothrix monilata
| Luo, Xiaotian, Gao, Feng, Yi, Zhenzhen, Pan, Ying, Al-Farraj, Saleh A. & Warren, Alan 2017 |
AMPHISIELLIDAE
| JANKOWSKI 1979 |