Review of Admirandus Belogurov & Belogurova, 1979 (Nematoda, Oncholaimidae) with the description of a new species and the first record of the genus from Brazil
Author
Cavalcanti, Mariana Da Fonseca
Author
Guilherme, Betânia C.
0000-0001-5459-2222
betaguilherme2@gmail.com
Author
Rosa-Filho, José Souto
0000-0002-5496-7706
souto.rosa@ufpe.br
text
Zootaxa
2023
2023-02-16
5244
1
71
81
http://dx.doi.org/10.11646/zootaxa.5244.1.6
journal article
10.11646/zootaxa.5244.1.6
1175-5326
7645815
DE93F31E-A885-463B-A28A-D40EAFCB795C
Genus
Admirandus
Belogurov & Belogurova, 1979
Diagnosis of
Admirandus
Belogurov & Belogurova, 1979
(after
Mordukhovich
et al
. 2015
and Lo Russo
et al.
2016).
Outer labial and cephalic sensilla papilliform. Cephalic sensilla setiform, surrounded by marginal lamellae shaped in form of hook plates. Buccal capsule elongated, length to width ratio
ca
. 1.5:1 to 3:1. Buccal cavity with three teeth, right ventrosublateral large, two other smaller, equal in size. Ovaries paired. Demanian system of
Adoncholaimus
type
, but with terminal canals and pores located caudally. Spicules curved, cephalated proximally, point-ed distally, broadening slightly prior to distal end. Gubernaculum present. Supplementary ventromedial pre-cloacal organ present or absent. Tail conical anteriorly, cylindrical posteriorly. Pre- and post-cloacal sensilla setiform.
FIGURE 1.
Admirandus capibaribei
sp. n.
male. A: General view, showing the tip of the anterior testis (arrow). B: head, showing the outline of the pocket-shaped amphid (arrow). B’: head showing the dorsal tooth, denticles, and secretory-excretory pore (arrow). C: tail with spicules, gubernaculum and cloacal setae. Scale bars: A = 200 µm; B, B’ and C = 50 µm.
FIGURE 2.
Admirandus capibaribei
sp. n.
female. A: General view, showing the uvette of the demanian system (arrow). B: region of the head, showing the pocket-shaped outline of the amphid and secretory-excretory pore (arrows). B’: region of the head, showing the teeth. C: region of the tail region, showing the anus and the pores of the Demanian system (arrows). Scale bars: A = 200 µm; B, B’, and C = 50 µm.
FIGURE 3.
Admirandus capibaribei
sp. n.
male: A: general view. B: Head. B’: buccal cavity, showing the nerve ring and secretory–excretory pore. C: secretory–excretory gland. D: tail, showing the spicules, gubernaculum and caudal glands. Scale bars: A = 200 µm; B, B’, C, and D = 50 µm.
FIGURE 4.
Admirandus capibaribei
sp. n.
, female: A: general view. B: buccal cavity. B’: head. C: Gonad with an egg and part of the demanian system. D: Tail showing the pores of the demanian system. Scale bars: A = 200 µm; B, B’, and C = 100 µm; D = 50 µm.
TABLE 1.
Morphometric parameters (µm) of
Admirandus capibaribei
sp. n.
(n.a. = not applicable; n.v. = not visualized).
| Measurements |
Holotype |
Male paratypes (n=2) |
Female paratypes (n=6) |
| Total body length |
2370 |
2520–2730 |
2520–3150 |
| Body length divided by maximum body diameter (a) |
24.4 |
23.7–31.6 |
20.7–29.2 |
| Body length divided by pharynx (b) |
4.8 |
5.1–6.1 |
6.1–7 |
| Body length divided by tail (c) |
18.2 |
16.9–18.7 |
11.2–15.2 |
| Tail length divided by anal body diameter (c’) |
2.6 |
2.6–3.3 |
3–3.8 |
| Cephalic setae length (large) |
1.4 |
1.8 |
1.8 |
| Cephalic setae length (short) |
0.9 |
0.9–1.1 |
0.9 |
| Distance of amphideal fovea from anterior end |
18 |
15.3–17.1 |
14.4–17.1 |
| Amphideal fovea diameter |
9.9 |
9–10.8 |
7.2–9 |
| Corresponding body diameter (cbd) |
32.4 |
29.7–30.6 |
31.5–34.2 |
| Percentage of amphideal fovea diameter |
30.8 |
30.3–35.3 |
21.1–28.6 |
| Buccal cavity width |
13.5 |
10.8–18.4 |
18–19.9 |
| Buccal cavity length |
40.5 |
40.5–43.2 |
45 |
| Buccal cavity ratio |
2.4 |
2.4–2.8 |
2.3–2.5 |
| Distance of the secretory-excretory gland to anterior end |
630 |
567–667 |
558–720 |
| Distance of the secretory-excretory pore to anterior end |
68.4 |
66.6–74.7 |
65.7–99 |
| Distance of the nerve ring to anterior end N.R. |
225 |
225 |
204.3–225 |
| Pharynx length |
495 |
414–495 |
405–450 |
| Maximum body diameter (mbd) |
97.2 |
81.9–106.2 |
108–127.8 |
| Spicule arc length |
54 |
49.5 54 |
- |
| Anal body diameter (abd) |
49.5 |
48.6–51.3 |
51.3–63.9 |
| Sp/abd |
1.1 |
0.9–1.1 |
- |
| Gubernaculum length |
18 |
18 |
- |
| Tail cylindrical part length |
504 |
504–621 |
- |
| Periocloacal setae |
2.7 |
2.7–4.5 |
- |
| Distance of the vulva to the anterior end |
- |
- |
1365–1470 |
| Position of the vulva as percentage of body length to posterior end |
- |
- |
43–53 |
| Tail length |
130.5 |
135–162 |
189–225 |
| Tail cylindrical part length |
90 |
90–117 |
117–135.9 |
| Tail cylindrical portion ratio |
1.5 |
1.3–1.5 |
1.5–1.9 |
Emended identification key for
Admirandus
species
1 Demanian system with 2 tubes and pores.........................................................
A. papillatus
- Demanian system with 3 tubes and pores................................................................... 2
2 Presence of a mid-ventral preanal supplementary organ.............................................
A. belogurovi
- Preanal supplement absent.............................................................................. 3
3 Spicule longer than
50 mm
....................................................................
A. multicavus
- Spicule length less than
50 mm
........................................................
A. capibaribei
sp. nov.