Five new and five known species of the genus Tylencholaimus de Man, 1876 (Nematoda: Dorylaimida: Tylencholaimoidea) from Western Ghats of India
Author
Islam, Md Niraul
Nematode Biodiversity Research Lab, Department of Zoology, Aligarh Muslim University, Aligarh- 202002, India.
mnislam15@gmail.com
Author
Ahmad, Wasim
Nematode Biodiversity Research Lab, Department of Zoology, Aligarh Muslim University, Aligarh- 202002, India.
text
European Journal of Taxonomy
2021
2021-10-07
774
1
58
105
http://dx.doi.org/10.5852/ejt.2021.774.1531
journal article
4101
10.5852/ejt.2021.774.1531
8d93af91-9490-40ee-8585-797b2accd9ce
2118-9773
5557162
0974BA12-57D5-4AFA-8E89-560ABDEF3AB1
Tylencholaimus cosmos
(
Dhanam & Jairajpuri, 1999
)
Fig. 6
,
Table 5
Amphitylencholaimus cosmos
Dhanam & Jairajpuri, 1999: 2
, 4
Tylencholaimus cosmos
–
Peña-Santiago 2008: 120–121
.
Material examined
INDIA
–
Goa State
•
3
♀♀
;
South Goa district
,
Verna
;
15º35.3′59.3″ N
,
73º92.2′26.4″ E
;
5–15 cm
depth;
22 Apr. 2016
; soil sample collected from around the roots of grasses (unidentified); slide reference number AMU/ZD/NC/
Tylencholaimus cosmos
/1
. –
Kerala State
•
3
♀♀
;
Thiruvananthapuram district
,
Ponmudi
hill;
8º45′36.2″ N
,
77º07′08.2″ E
;
5–15 cm
depth;
4 Nov. 2017
; soil sample collected from around the roots of grasses (unidentified); slide reference number AMU/ZD/NC/
Tylencholaimus cosmos
/2
.
Fig. 6.
Tylencholaimus cosmos
(
Dhanam & Jairajpuri, 1999
)
, ♀ (LM photographs).
A–B
.Anterior region.
C
. Anterior region showing amphid.
D
. Pharyngeal region.
E
. Expanded part of pharynx.
F–G
. Genital system.
H
. Vulval region.
I–J
. Posterior region.
K
. Posterior end. Scale bars: A–C, E–K = 10 μm; D = 20 μm.
Table 5.
Measurements of
Tylencholaimus cosmos
(
Dhanam & Jairajpuri, 1999
)
. All measurements are in µm and in the form: mean ± s.d. (range).
|
Localities
|
Verna population
|
Ponmudi population
|
|
Characters
|
Females
|
Females
|
| n |
3 |
3 |
| L |
645.8 ± 21.5 (616–667) |
656.9 ± 86.6 (555–767) |
| a |
28.9 ± 1.8 (27.3–31.7) |
29.8 ± 3.3 (25.7–33.0) |
| b |
3.9 ± 0.13 (3.8–4.2) |
3.5 ± 0.39 (3.1–4.1) |
| c |
37.3 ± 0.38 (37.0–37.8) |
34.5 ± 3.9 (29.8–39.1) |
| c’ |
1.03 ± 0.03 (1.0–1.1) |
1.1 |
| V |
58.8 ± 0.92 (58.5–60.5) |
60.4 ± 0.92 (59.6–61.7) |
| G1 |
13.1 ± 0.42 (12.6–13.6) |
12.7 ± 1.0 (11.8–14.2) |
| G2 |
11.2 ± 1.0 (10.2–12.6) |
11.7 ± 0.65 (11.0–12.5) |
| Body diameter at neck base |
21.2 ± 0.92 (20–22) |
20.5 ± 1.6 (18–22) |
| Body diameter at mid body |
21.8 ± 0.92 (20–22) |
21.5 ± 1.6 (19–23) |
| Body diameter at anus |
15.5 ± 0.46 (15–16) |
16.6 ± 0.80 (15–17) |
| Lip region diameter |
8.0 |
8.0 |
| Lip region height |
3.7 ± 0.23 (3.0–4.0) |
3.1 ± 0.23 (3.0–3.5) |
| Amphidial aperture |
2.0 |
2.6 ± 0.23 (2.5–3.0) |
| Odontostyle length |
7.8 ± 0.23 (7.5–8.0) |
7.6 ± 0.23 (7.0–8.0) |
| Odontophore length |
8.9 ± 0.23 (8.5–9.0) |
9.6 ± 0.23 (9.5–10) |
| Total stylet length |
16.6 ± 0.40 (16.5–17.0) |
17.8 ± 0.23 (17.5–18.0) |
| Guiding ring from anterior end |
5.5 |
5.2 ± 0.23 (5.0–5.5) |
| Nerve ring from anterior end |
75.1 ± 5.4 (67–80) |
70.8 ± 3.7 (65–74) |
| Neck length |
160.7 ± 2.7 (158–164) |
180.6 ± 4.5 (174–185) |
| Expanded part of pharynx |
66.6 ± 2.1 (63–68) |
75.7 ± 0.46 (75–76) |
| Cardia length |
5.0 |
4.9 ± 0.80 (4.0–5.5) |
| Anterior genital branch |
86.5 ± 4.6 (82–93) |
85.5 ± 11.3 (69–94) |
| Posterior genital branch |
73.8 ± 4.4 (68–79) |
78.0 ± 7.8 (71–89) |
| Vaginal length |
9.9 ± 0.23 (9.5–10.0) |
10.3 ± 0.46 (9.5–10.5) |
| Vulva from anterior end |
386.4 ± 18.4 (360–402) |
396.2 ± 47.1 (343–457) |
| Prerectum length |
37.5 ± 2.0 (35–40) |
39.2 ± 1.3 (37–40) |
| Rectum length |
19.2 ± 1.2 (17–20) |
21.8 ± 0.46 (21–22) |
| Tail length |
17.3 ± 0.46 (16.0–17.5) |
18.6 ± 0.80 (17–19) |
Remarks
Dhanam & Jairajpuri (1999)
described
Amphitylencholaimus cosmos
from Malnad tracts of
Karnataka
,
India
.
Peña-Santiago (2008)
did not accept the generic status of
Amphitylencholaimus
and transferred
A. cosmos
to
Tylencholaimus
.
Ahad & Ahmad (2016)
reported this species from Kaziranga National Park,
Assam
,
India
.
Dhanam & Jairajpuri (1999)
characterized this species by having the anterior slender part of pharynx expanding gradually to form the cylindroid basal part but in their fig. 1C, the anterior part of pharynx appears slender, expanding abruptly to form the basal expanded part. In the present specimens, the anterior part of pharynx is also slender, expanding abruptly to form the basal expanded part. The morphometrics of the present populations conform well with the
type
population except in having a shorter body length (0.55–0.76 vs
0.7–0.9 mm
), slightly lower b value (3.1–4.2 vs 3.9–5.0) and shorter odontophore length (8.5–10 vs 12–14 μm). The present populations also conform well with the
Assam
population except in having a slightly higher lip region (3.0–3.5 vs 2.0–3.0 μm) and a longer rectum (17–22 vs 13–14 μm).