Lanzavecchia mangrovi sp. n. (Nematoda, Dorylaimida) from mangroves of Red River Estuary, Vietnam.
Author
Gagarin, Vladimir G.
text
Zootaxa
2014
3764
4
489
494
journal article
46460
10.5281/zenodo.225100
bc6bf5ac-6e00-46c9-9a3e-5988b4cbf085
1175-5326
225100
F7E9B081-D98E-4512-8DAB-1A1FFF058468
Lanzavecchia mangrovi
sp. n.
(
Figs 1
,
2
;
Table 1
)
Type
material
.
Holotype
male, slide reference number 102/24, deposited in the RAS Helminthological Museum, Institute of Ecology and Evolution, Center for Parasitology, Russian Academy of Sciences (Moscow,
Russia
).
Paratypes
. Two males and one female deposited in the RAS Helminthological Museum, Institute of Ecology and Evolution, Center for Parasitology, Russian Academy of Sciences (Moscow,
Russia
); six males and three females deposited in the collection of the Department of Nematology of the Institute of Ecology and Biological Resources (
JEBR
),
Vietnam
Academy of Science and Technology, 18 Hoang Quoc Viet Rd., Hanoi,
Vietnam
.
Measurements
.
Table 1
.
Type
locality.
North
Vietnam
, Nam Dinh Province, Red River Delta, Xuan Thuy National Park, mangroves. Latitude: 20º13, 672? N, Longitude: 106º31, 324 E. Depth
25 cm
, silt, salinity 27.0 ‰. Collected on
30 October 2012
.
Etymology
. The specific epithet means “mangroves”, “from
mangrove
thickets”.
Description. Male
. Body comparatively long and thin, tapering toward both extremities. Cuticle smooth, 3.0– 3.5 µm thick at mid-body. Lateral pores not visible. Lips amalgamated, labial and cephalic papillae barely visible. Labial region well set off. Amphidial fovea cup-like, wide, occupying 65–78 % of the corresponding body diameter and situated at the base of lips. Odontostyle long, thin and slightly curved, 1.6–1.9 times the labial region diameter, its aperture constituting only 10–15 % its length. Odontophore rod-like, 0.8–1.0 times as long as odontostyle length. Guiding ring unitary, single. Pharynx divided into two portions. Anterior portion thin, poorly muscular, posterior portion thicker, muscular, occupying 41–46 % of pharynx length. Pharyngeal gland nuclei indistinct. Cardia conoid, muscular, surrounded with intestinal tissue.
Testes paired, opposed, situated to the left of intestine; anterior testis outstretched, posterior testis reflexed. Vas deferens well developed. Spicules dorylaimoid, 1.5–1.8 cloacal body diameters long, with two spindle-shaped guiding pieces. In addition to adanal pair, a series of 29–32 contiguous ventromedial supplements are present. Prerectum very long, well developed, 13.1–18.2 cloacal body diameter long, intestine-prerectum junction anterior to anteriormost supplement. Tail long, with proximal conical and distal thin, whip-like portions, gradually merging into one another. Distal portion of this tail is 0.9–1.2 times as long as its proximal portion. Tail bearing 3–4 pairs of caudal papillae.
Female
. General morphology is similar to that of males in structure of cuticle and anterior body end. Cuticle smooth. Lips amalgamated. Labial region well set off. Amphidial fovea cup-like, wide, situated at the base of lips.
FIGURE 1.
Lanzavecchia mangrove
sp. n.
, holotype male and paratype female. A: female, entire body; B: male, entire body; C: male, head; D: male, anterior body end; E: vulva region; F: Female, posterior body end; G: male posterior body end. Scale bars: A,b=300µm, D,E=80µm; F,G=60µm; C=20µm.
FIGURE 2.
Lanzavecchia mangrove
sp. n.
, paratypes male and female. A: male, entire body; B: male, head; C: male, anterior body end; D: female, vulva region; E: female, posterior body end; F: male, posterior body end. Scale bars: A=250µm; E=100µm; C,D,F=50µm; B=20µm.
Odontostyle long, thin and slightly curved. Odontophore rod-like, 0.9–1.1 times as long as odontostyle length. Guiding ring unitary, single. Pharynx divided into two portions. Anterior portion thin, poorly muscular, posterior portion thicker, muscular, occupying 41–43% of pharynx length. Prerectum 12.3–17.5 anal body diameters long. Rectum 0.9–1.2 times as long as anal body diameter. Reproductive system didelphic, amphidelphic; ovaries antidromous, reflexed Vulva a transverse slit, pre-equatorial. Vulva lips not sclerotized, not protruding outside the body contour. Oocytes numerous, first in two rows, then a single row. Uterus spacious, containing two to four eggs, measuring 113–135
x 43
–60 µm. Vagina extending to half of the corresponding body diameter, with muscular walls. Tail long, with proximal conical and distal thin, whip-like portions, gradually merging into one another. Distal portion of this tail 1.8–2.3 times as long as its proximal portion.
Diagnosis
. Body long and thin (L = 2708–3755 µm, a = 39–51). Cuticle smooth. Lips amalgamated; labial region well off set. Odontostyle long, very thin and slightly curved, 23–25 µm long; its aperture constituting 10–15 % its length. Odontophore 21–24 µm long. Guiding ring unitary, simple. Pharynx divided into two portions: anterior portion thin, poorly muscular, posterior portion thicker, muscular, occupying 41–41% of pharynx length. Vulva a transverse slit, pre-equatorial. Uterus spacious, with numerous spermatozoa and 2–
4
eggs, measuring 113– 135
x 43
–60 µm. Spicules 63–65 µm long, 29–32 contiguous ventromedian supplements. Prerectum in males long, well developed, 13.1–18.2 cloacal body diameter long; intestine-prerectum junction always anterior to anterior most supplement. Tail long, with proximal conical and distal thin, whip-like portions, gradually merging into one another. Distal portion 1.0–2.3 times as long as its proximal portion.
TABLE 1.
Morphometrics of
Lanzavecchia mangrovi
sp. n
.
(all measurements are given in µm unless otherwise stated, expect for the ratios a, b, c, c’, V and n. sup.)
| Character |
Holotype male |
Paratype males |
Paratype females |
| n |
1 |
9 |
4 |
| L |
3103 |
2994±125 (2815–3158) |
3176±381 (2708–3755) |
| a |
40 |
44±4 (39–50) |
46±4 (41–51) |
| b |
11.0 |
10.1±0.6 (9.3–11.0) |
11.2±1.1 (9.8–12.7) |
| c |
29.3 |
28.4±1.9 (24.7–30.3) |
26.4±2.9 (22.0–30.0) |
| c’ |
2.6 |
2.6±0.2 (2.2–3.0) |
3.4±0.3 (2.9–3.7) |
| V |
– |
– |
46.2±2.2 (42.4–47.9) |
| diam.c.s |
14 |
13±1 (13–14) |
14±1 (13–14) |
| diam.midb. |
77 |
69±7 (58–77) |
69±14 (56–90) |
| a.d. |
41 |
41±3 (36–47) |
36±4 (30–41) |
| ods. |
25 |
24±1 (23–25) |
23±1 (23–24) |
| odph. |
23 |
23±1 (21–24) |
24±1 (23–24) |
| ph.l. |
281 |
297±18 (263–322) |
277±17 (250–293) |
| bul.l. |
130 |
128±9 (113–144) |
116±3 (113–119) |
| dis.ph.cl. |
2716 |
2592±117 (2435–2759) |
– |
| dis.ph.v. |
– |
– |
1155±161 (933–1229) |
| dis.v.a. |
– |
– |
1625±217 (1405–1985) |
| t.l. |
106 |
105±6 (95–115) |
119±10 (104–131) |
| pr.l. |
567 |
599±35 (563–675) |
517±56 (500–603) |
| spic. |
65 |
64±1 (63–65) |
– |
| n.sp. |
32 |
31±1 (29–32) |
– |
| l.sup.r. |
117 |
112±5 (106–117) |
– |
Differential diagnosis.
The genus
Lanzavecchia
Zullini, 1988
currently contains 2 valid species:
L. fafner
Zullini, 1988
and
L. coomansi
(
Nicholas & Stewart, 1984
)
Andrássy, 2009
).
L. fafner
was
found in Lake Zway, Ephiopia (
Zullini, 1988
). With a body length of
7.56–8.08 mm
,
L. fafner
is much longer than
L. mangrovi
.
Lanzavecchia mangrovi
sp. n.
is similar to
L. coomansi
,
found in mangroves in
Australia
(
Nicholas & Stewart, 1984
), but differs in the longer body (L =
2.71–3.76 mm
versus
L =
2.2–2.9 mm
in
L. coomansi
), shorter spicules (63–65 µm
versus
72–88 µm in
L. coomansi
), longer prerectum (500–675 µm
versus
262–310 µm in
L. coomansi
) and shorter distal portion of tail in relation to its proximal portion (0.6–0.8
versus
0.9–2.3 in
L. coomansi
) (
Nicholas, Stewart, 1984
).