Oxytricha chongqingica, Han & Xue & Zhang & Shao, 2025
|
publication ID |
https://doi.org/10.3897/zookeys.1247.155543 |
|
publication LSID |
lsid:zoobank.org:pub:791C10AB-3313-4692-BE65-39405C11551F |
|
DOI |
https://doi.org/10.5281/zenodo.16419644 |
|
persistent identifier |
https://treatment.plazi.org/id/69EB1241-A3A6-5670-8B9C-29D8778CF16B |
|
treatment provided by |
|
|
scientific name |
Oxytricha chongqingica |
| status |
sp. nov. |
Oxytricha chongqingica sp. nov.
Figs 2 A – E View Figure 2 , 3 A – L View Figure 3 ; Table 1 View Table 1
Diagnosis.
Body size 100–160 × 40–60 μm in vivo, elliptical to elongate-elliptical in outline. Two macronuclear nodules and one to five micronuclei. Contractile vacuole located at mid-body close to left margin. Cortical granules about 1 μm across, arranged in long rows, colorless. The adoral zone occupying 35–44 % of the body length, consisting of 37–49 adoral membranelles. Paroral and endoral arranged in a typical Oxytricha - pattern. Typical 18 frontoventral-transverse cirri, buccal cirrus positioned at the anterior end of paroral, cirrus III / 2 close to and slightly ahead of the level of cirrus VI / 3, cirrus V / 4 behind cirrus IV / 2, the distances between cirri V / 3 and V / 4 and between cirri V / 2 and VI / 2 obvious shorter than that between cirri V / 3 and V / 2. Right and left marginal rows with 32–46 and 33–43 cirri, respectively, confluent at the posterior end of cell. Usually, six dorsal kineties including two dorsomarginal kineties. Dorsal kinety 3 terminating caudally, dorsal kineties 3 and 4 connected by four or five dikinetids, and dorsal kinety 5 ending at approximately 80 % down length of body. Three caudal cirri, each one at the posterior end of dorsal kineties 1, 2, and 4.
Type material.
The protargol-stained slide (no. XXJ 202408130901 A ) with the holotype specimen (Figs 2 D, E View Figure 2 , 3 G, H View Figure 3 ) marked with an ink circle, and two paratype slides (no. XXJ 202408130901 B , C) are deposited in the Laboratory of Protozoological Biodiversity and Evolution in Wetland, Shaanxi Normal University ( SNNU), China GoogleMaps .
Type locality.
Soil from Yintiaoling Nature Reserve GoogleMaps in Chongqing, southwestern China (31°31'26"N, 109°49'31"E).
Etymology.
The species-group name “ chongqingica ” refers to Chongqing, the type locality.
Description.
Body size 100–160 × 40–60 μm (n = 7) in vivo, 110–170 × 40–100 μm after protargol staining. Ratio of body length to width 2.5–3.0 in vivo. Flexible but not contractile, elliptical to elongate-elliptical in outline with anterior and posterior ends slightly narrowly rounded. Right margin slightly flat and left margin distinctly convex (Figs 2 A View Figure 2 , 3 A, B View Figure 3 ; Table 1 View Table 1 ). Nuclear apparatus consisting of two macronuclear nodules and one to five micronuclei. Macronuclear nodules usually located at 33 % and 66 % down length of body, respectively, and slightly left of the cell mid-line, about 25 × 15 μm in vivo. Micronuclei attached to macronuclear nodules at variable positions, each about 7 μm across in vivo (Figs 2 E View Figure 2 , 3 D, J View Figure 3 ; Table 1 View Table 1 ). Contractile vacuole about 13 μm in diameter when fully expanded, located at about mid-body close to left margin, contracting at intervals of about 10 s, with two non-obvious collecting canals (Figs 2 A View Figure 2 , 3 A, B View Figure 3 ). Cortical granules arranged in long rows on both sides, colorless, about 1.0 μm across (Figs 2 B, C View Figure 2 , 3 C View Figure 3 ). Cytoplasm colorless, filled with numerous food vacuoles (2–10 μm in diameter), lipid droplets (0.5–2 μm across), and diatoms (up to 21 μm in length). Movement usually crawling moderately rapidly on the bottom of a petri dish or other substrates, when in suspension, swimming rapidly while spiraling in a counter-clockwise helix.
Adoral zone occupying 35–44 % of body length in protargol preparations and consisting of 37–49 membranelles, and cilia extending up to 21 μm in length (Figs 2 A, D View Figure 2 , 3 G, I View Figure 3 ; Table 1 View Table 1 ). DE-value 0.26–0.37 (Table 1 View Table 1 ). Buccal cavity flat. Endoral and paroral bending and optically intersecting with each other. Pharyngeal fibres inconspicuous after protargol impregnation (Figs 2 D View Figure 2 , 3 E, I View Figure 3 ).
Three slightly enlarged frontal cirri, with cilia approximately 16 μm long, arranged in an oblique pseudorow, with rightmost cirrus located behind distal end of adoral zone of membranelles. Single buccal cirrus positioned at the anterior end of the paroral. Four frontoventral cirri, characteristically arranged, namely, cirrus III / 2 close to and slightly ahead of level of cirrus VI / 3. Three postoral ventral cirri, cirrus V / 4 positioned behind level of cirrus IV / 2, the distances between cirri V / 3 and V / 4, and between cirri V / 2 and VI / 2 shorter than that between cirri V / 3 and V / 2. Two pretransverse ventral cirri, cirrus VI / 2 located ahead of rightmost transverse cirrus. Usually, five (rarely four, only two in 21) slightly enlarged transverse cirri arranged in hook-shaped pseudorow, with cilia about 20 μm long in vivo. One right and one left marginal row, with cilia about 15 μm long, consisting of 32–46 and 33–43 cirri, respectively. Right marginal row commencing at level of VI / 4, while left marginal row starting near posterior end of adoral zone. Both terminating at posterior end of cell and confluent (Figs 2 D View Figure 2 , 3 G, I, K View Figure 3 ; Table 1 View Table 1 ).
Usually six (rarely seven, only four in 21) dorsal kineties including two (rarely three, only four in 21) dorsomarginal kineties, cilia about 4 μm in vivo. Dorsal kinety 1 commencing subapically, while kineties 2 and 3 starting apically, all ending at posterior end of cell, comprising 33–52, 25–39, and 19–29 dikinetids, respectively. Dorsal kinety 4 commencing at about 55 % down length of body, terminating at posterior end of cell, and consisting of 9–15 dikinetids. Dorsal kinety 4 not clearly separated from kinety 3, four to six dikinetids existing between them. Dorsal kinety 5 (dorsomarginal kinety) stretching to approximately 80 % down length of body and composed of 15–28 dikinetids, while dorsal kinety 6 (dorsomarginal kinety) terminating near midbody and consisting of 9–19 dikinetids. Dorsal kinety 7 (dorsomarginal kinety), if presenting, positioned at about 25 % down length of body near right body margin, consisting of one or two dikinetids. Three caudal cirri, each one at the posterior end of dorsal kineties 1, 2, and 4 (Figs 2 E View Figure 2 , 3 H, L View Figure 3 ; Table 1 View Table 1 ).
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.
|
Kingdom |
|
|
Phylum |
|
|
Class |
|
|
SubClass |
Hypotrichia |
|
Order |
|
|
Family |
|
|
Genus |