The genus
To date more than 48 species have been recognized for
Soil, root, and moss samples, were randomly collected from different regions of eastern forests of Guilan province, northern Iran during 2015. Nematodes were extracted from sample materials by the tray method (Whitehead and Hemming, 1965) and were soaked in a small amount of water for 48 hr. The extracted nematodes were observed and hand-picked using a stereomicroscope. Adult specimens for microscopic observation were killed by gentle heat and fixed in a solution of FGA 4:1:1 (formaldehyde, glycerin, and acetic acid) and processed to anhydrous glycerin (De Grisse, 1969). Permanent slides were made and examined using an Olympus BH2 light microscope. Morphometric data were obtained using a drawing tube and photomicrographs were taken using a digital camera. Line drawings were redrawn using CorelDraw® software version 17.
Single nematode specimens were handpicked and examined individually by light microscopy and transferred to 10 μl of distilled water on a glass microscope slide, crushed with a pipette tip and collected in 50 μl AE buffer (10 mM
A volume of 1 μl of extracted DNA was transferred to an Eppendorf tube containing: 2.5 μl 10× NH4 reaction buffer, 0.75 μl MgCl2 (50 mM), 0.25 μl dNTPs mixture (10 mM each), 0.75 μl of each primer (10 mM), 0.2 μl BIOTAQ DNA Polymerase (Bioline, UK) and ddH2O to a final volume of 25 μl. The D2–D3 expansion segment of 28S rRNA gene was amplified using the forward D2A (5′-ACAAGTACCGTGAGGGAAAGTTG-3′) and reverse D3B (5′-TCGGAAGGAACCAGCTACTA-3′) primers (Nunn, 1992). The ITS region was amplified using forward primer TW81 (5′-GTTTCCGTAGGTGAACCTGC-3′) and reverse primer 5.8SM5 (5′-GGCGCAATGTGCATTCGA-3′) (Maafi et al., 2003; Vovlas et al., 2008), and the partial 18S was amplified using primers 1096F (5′-GGTAATTCTGGAGCTAATAC-3′), 1912R (5′-TTTACG GTCAGAACTAGGG-3′) (Holterman et al., 2006). PCR cycle conditions were as follows: one cycle of 94°C for 2 min, followed by 35 cycles of 94°C for 30 sec, annealing temperature of 55°C for 45 sec, 72°C for 3 min, and finally one cycle of 72°C for 10 min. PCR products were purified after amplification using ExoSAP-IT (Affmetrix, USB Products), quantified using a Nanodrop spectrophotometer (Nanodrop Technologies) and used for direct sequencing in both directions using the primers referred to above.
Newly obtained sequence of the D2–D3 expansion region of 28S, ITS, and partial 18S rRNA and available sequences of anguinid nematodes obtained from GenBank were used for phylogenetic reconstructions. The newly obtained and published sequences were aligned using Muscle (Edgar, 2004) with default parameters implemented in MEGA 5.0 (Tamura et al., 2011). Sequence alignment was edited using MEGA 5.0. The most appropriate model was determined using the Bayesian Information Criterion (BIC) implemented in the jModelTest program (Posada, 2008). Phylogenetic analyses of the sequence data set was performed based on Bayesian inference (BI) using MRBAYES3.1.2 (Ronquist and Huelsenbeck, 2003). The topologies were used to generate a 50% majority rule consensus tree. Posterior probabilities (PP) were given on appropriate clades. Trees were visualized using TreeView (Page, 1996).
Morphometrics of
Female | Male | ||
---|---|---|---|
Character | Holotype | Paratypes | Paratypes |
|
ˋ | 6 | 4 |
|
778 | 754.7 ± 98.6 (681–962) | 640 ± 70.7 (574–738) |
|
38.9 | 35.3 ± 3.6 (30.3–38.9) | 34.1 ± 1.7 (31.9–35.6) |
|
6.1 | 5.9 ± 0.4 (5.4–6.4) | 5.4 ± 0.4 (5.2–6.0) |
|
13.2 | 11.7 ± 1.3 (8.9–13.2) | 10.6 ± 1.7 (8.4–12.5) |
|
4.5 | 5.0 ± 0.6 (4.4–6.0) | 4.7 ± 0.9 (3.8–5.9) |
|
81.6 | 80.7 ± 1.7 (77.1–82.4) | 47.6 ± 1.8 (45.3–49.7) |
Lip region height | 2.0 | 2.0 | 2.3 ± 0.5 (2.0–3.0) |
Lip region width | 5.0 | 5.4 ± 0.5 (5.0–6.0) | 5.3 ± 0.5 (5.0–6.0) |
Stylet length | 9.0 | 8.3 ± 0.5 (8.0–9.0) | 8.1 ± 0.3 (8.0–8.5) |
|
44.4 | 45.7 ± 2.9 (43.8–50.0) | 49.2 ± 3.9 (43.8–52.9) |
E. pore from anterior end | 103 | 99.0 ± 7.4 (92–112) | 92 ± 3.9 (87–96) |
Pharynx length | 128 | 127.4 ± 16.2 (114–162) | 117.3 ± 6.0 (109–123) |
Max. body diam. | 20 | 21.6 ± 3.7 (18–28) | 18.8 ± 1.5 (18–21) |
Vulval body diam. (VBD) | 19 | 19.7 ± 3.3 (17–26) | – |
Vulva–anus distance (V–A) | 84 | 80.3 ± 14.8 (70–112) | – |
Post-uterine sac (PUS) length | 45 | 43.4 ± 5.6 (39–55) | – |
PUS/Vulval body diam. | 2.4 | 2.2 ± 0.2 (2.0–2.4) | – |
PUS/V–A% | 53.6 | 54.6 ± 4.3 (49.1–62.0) | – |
Ovary length or testis | 410 | 358.7 ± 69.6 (275–457) | 305 ± 42.1 (273–367) |
Anal (cloacal) body diam. | 13 | 13.0 ± 2.3 (11–18) | 13.0 ± 1.4 (12.0–15.0) |
Spicule length | – | – | 18.0 ± 0.6 (18.0–19.0) |
Gubernaculum length | – | – | 5.3 ± 0.5 (5.0–6.0) |
Tail length | 59 | 66.1 ± 18.6 (55–108) | 62.3 ± 18.0 (46–88) |
Bursa (% of tail) | – | – | 28.0 ± 3.4 (24.6–32.6) |
aLength of conus as percentage of total stylet length.
Females
Body subcylindrical, tapering at both ends and almost straight upon fixation. Cuticle with transverse striae measuring
Males
Similar to female in general morphology with usually shorter body size. Lip region is slightly higher than female, 2 to 3 μm high and 5 to 6 μm wide. Cuticle with transverse striae measuring
Line drawings of
Photomicrographs of
The new species was recovered from moss samples (
Holotype female (slide ANA001) together with four paratype specimens: Two females, two males (slides ANA001, ANA002) deposited in the Nematode Collection of the Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran. Two female and two male paratypes deposited at Royal Belgian Institute of Natural Sciences, Brussels, Belgium. Paratype females deposited in the National Nematode Collection of the Department of Nematology, Iranian Research Institute of Plant protection, Tehran, Iran.
The new species is named in honor of Dr István Andrássy, a pioneering scientist in the systematics of nematodes.
Amplification of D2–D3 expansion segments of 28S, ITS, and the partial 18S rRNA yielded a single fragment of 615 bp, 430 bp, and 775 bp, respectively.
The molecular phylogenetic trees were obtained from Bayesian analysis under the GTR + I + G model (Tavaré, 1986) to infer the relative placement of the new species among other species of
The BlastN search of partial 18S rRNA gene sequence of
The molecular phylogenetic tree generated from the partial 18S rRNA included 32 in-group and three outgroup taxa. In this tree
The molecular phylogenetic tree generated from D2–D3 expansion segments of 28S rRNA included 36 in-group and three outgroup taxa. In this tree
The molecular phylogenetic tree generated from ITS rRNA included 27 in-group and two outgroup taxa. In this tree all species of Anguinidae grouped in a 100% supported monophyletic clade and
The molecular phylogenetic tree generated from the partial 18S rRNA inferred from Bayesian analyses under GTR + G + I model. Posterior probability values exceeding 50% are given on appropriate clades. The new species is in bold font.
The molecular phylogenetic tree generated from the D2–D3 of 28S rRNA inferred from Bayesian analyses under GTR + G + I model. Posterior probability values exceeding 50% are given on appropriate clades. The new species is in bold font.
The molecular phylogenetic tree generated from the ITS rRNA inferred from Bayesian analyses under GTR + G + I model. Posterior probability values exceeding 50% are given on appropriate clades. The new species is in bold font.