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Morphological, morphometrical, and molecular characterization of Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 (Rhabditida, Rhabditidae) from India and proposal of Metarhabditis longicaudata as a junior synonym of M. amsactae

Open Access
|Dec 2020

Figures & Tables

Figure 1:

Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 (line drawing). A: Anterior region; B: Cephalic region; C: Anterior branch of the female reproductive system; D: Entire female; E: Entire male; F: Female posterior region; G: Male posterior region.
Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 (line drawing). A: Anterior region; B: Cephalic region; C: Anterior branch of the female reproductive system; D: Entire female; E: Entire male; F: Female posterior region; G: Male posterior region.

Figure 2:

Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 (light microscopy). A: Anterior region (arrow pointing to the excretory pore); B: Cephalic region; C: Vagina region; D: Female posterior region (black arrow pointing to the anus, white arrow pointing to the phasmid); E: Anterior branch of the female reproductive system (black arrow pointing to the spermatheca); F-J: Male posterior region in lateral (F-I) and ventral (J) views, at spicules (F, H) and bursa (G, I) level (black arrows pointing to the genital papillae, white arrows pointing to the phasmids).
Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 (light microscopy). A: Anterior region (arrow pointing to the excretory pore); B: Cephalic region; C: Vagina region; D: Female posterior region (black arrow pointing to the anus, white arrow pointing to the phasmid); E: Anterior branch of the female reproductive system (black arrow pointing to the spermatheca); F-J: Male posterior region in lateral (F-I) and ventral (J) views, at spicules (F, H) and bursa (G, I) level (black arrows pointing to the genital papillae, white arrows pointing to the phasmids).

Figure 3:

Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 (scanning electron microscopy). A, B: Cephalic and lip region in sublateral and frontal views, respectively; C, F: Lateral field (arrows pointing to the longitudinal incisures); D, E: Excretory pore (arrow) at ventral and lateral views, respectively; G, H: Vulva in ventral and lateral views, respectively; I: Female anus; J, K: Female posterior region in right lateral and ventral views, respectively (white arrows pointing to the phasmid); L, M; Male posterior region in ventral and lateral views (black arrows pointing to the genital papillae, white arrows pointing to the phasmids).
Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 (scanning electron microscopy). A, B: Cephalic and lip region in sublateral and frontal views, respectively; C, F: Lateral field (arrows pointing to the longitudinal incisures); D, E: Excretory pore (arrow) at ventral and lateral views, respectively; G, H: Vulva in ventral and lateral views, respectively; I: Female anus; J, K: Female posterior region in right lateral and ventral views, respectively (white arrows pointing to the phasmid); L, M; Male posterior region in ventral and lateral views (black arrows pointing to the genital papillae, white arrows pointing to the phasmids).

Figure 4:

Bayesian Inference tree from previously and the newly sequenced Metarhabditis amsactae (bold) and other closely related species based on sequences of the Internal Transcribed Spacer (ITS1-5.8S-ITS2) rDNA region. Bayesian posterior probabilities (%) are given for each clade. The scale bar shows the number of substitutions per site.
Bayesian Inference tree from previously and the newly sequenced Metarhabditis amsactae (bold) and other closely related species based on sequences of the Internal Transcribed Spacer (ITS1-5.8S-ITS2) rDNA region. Bayesian posterior probabilities (%) are given for each clade. The scale bar shows the number of substitutions per site.

Figure 5:

Bayesian Inference tree from the newly sequenced Metarhabditis amsactae (bold) and other closely related species based on sequences of the small subunit (18S) of rDNA region. Bayesian posterior probabilities (%) are given for each clade. The scale bar shows the number of substitutions per site.
Bayesian Inference tree from the newly sequenced Metarhabditis amsactae (bold) and other closely related species based on sequences of the small subunit (18S) of rDNA region. Bayesian posterior probabilities (%) are given for each clade. The scale bar shows the number of substitutions per site.

Figure 6:

Bayesian Inference tree from the newly sequenced Metarhabditis amsactae (bold) and other closely related species based on sequences of the D2/D3 domain of large subunit (28S) of rDNA region. Bayesian posterior probabilities (%) are given for each clade. The scale bar shows the number of substitutions per site.
Bayesian Inference tree from the newly sequenced Metarhabditis amsactae (bold) and other closely related species based on sequences of the D2/D3 domain of large subunit (28S) of rDNA region. Bayesian posterior probabilities (%) are given for each clade. The scale bar shows the number of substitutions per site.

Compendium of females of Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 populations and its synonyms_

Species M. amsactae M. amsactae M. amsactae as O. ciceri M. amsactae as O. hussainii M. amsactae as O. gingeri M. amsactae M. amsactae as M. longicaudata M. amsactae as M. rainai Metarhabditis sp. as M. amsactae
ReferencePresent study Ali et al. (2011) Shaheen et al. (2011) Shaheen et al. (2011) Pervez et al. (2012) Asif et al. (2013) Tabassum et al. (2019) Tabassum et al. (2019) Tabassum et al. (2019)
CountryIndiaIndiaIndiaIndiaIndiaIndiaPakistanPakistanPakistan
HabitatRhizosphere of sugarcane and groundnutRhizosphere of mungbeanRhizosphere of chickpeaRhizosphere of pigeonpeaRhizosphere of gingerDecaying matterRhizosphere of mango treeDecomposed guava fruitRhizosphere of chicko
L 718-1,135658-786964-1,018902-9891,418-1,813786-9021,366-1,6841,769-2,0781,546-1,694
a 10.9-21.119.7-22.920.1-22.524.4-25.518.5-21.219.2-23.514.0-18.011.7-20.015.0-18.0
b 4.5-6.64.1-4.85.7-5.93.8-4.35.1-5.34.1-5.05.5-7.87.0-8.06.0-8.0
c 8.7-14.08.9-12.110.3-12.910.2-12.712.1-13.29.6-11.212.0-16.012.0-18.013.0-19.0
c′ 2.9-5.24.1-4.63.6-4.33.3-4.84.63.8-4.52.5.-4.44.0-8.03.0-4.0
V 46-5650-5843a 42a 51-6051-5548-5649-5850-54
Lip region width5-117-88-116-88-129-1011-1512a 12a
Stoma length14-2216-1818-1922-2319-2120-2522-2826-3022-26
Corpus length68-9896-11592-10013395-17050a 62-10657a 42a
Isthmus length40-4832-4430-4044-5628-5735-4530a 27a 33a
Bulb length26-3424-3526-3133-4544a 25-3519a 16a 17a
Nerve ring-ant. end98-15399-112111-134170-179178-203110-143154-19076a 95a
Excretory pore-ant. end110-166109-130134-136166-172187-223121-160148-25098a 112a
Pharynx length156-195159-178167-176220-225189-284177-218206-265250-279218-247
Mid-body width43-8132-3939-4632-4075-8926-4078-10892-11188-105
Anal body width16-2816-1720-2819-2325-2819-2225-3312-3030-36
Tail length68-10165-8075-9677-87115-12981-10094-112100-14884-132

Compendium of males of Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 populations and its synonyms_

Species M. amsactae M. amsactae M. amsactae as O. cicero M. amsactae as O. hussainii M. amsactae as O. gingeri M. amsactae M. amsactae as M. longicaudata M. amsactae as M. rainai Metarhabditis sp. as M. amsactae
ReferencePresent study Ali et al. (2011) Shaheen et al. (2011) Shaheen et al. (2011) Pervez et al. (2012) Asif et al. (2013) Tabassum et al. (2019) Tabassum et al. (2019) Tabassum et al. (2019)
CountryIndiaIndiaPakistanPakistanIndiaIndiaPakistanPakistanPakistan
HabitatRhizosphere of sugarcane and groundnutRhizosphere of mungbeanRhizosphere of chickpeaRhizosphere of pigeonpeaRhizosphere of gingerDecaying matterRhizosphere of mango treeDescomposed guava fruitRhizosphere of chicko
L 653-999594-804754-973855-889673-821683-8681,154-1,3251,100-1,3921,234-1,498
a 12.7-20.716.6-19.319.4-20.825.0.-28.018.3-24.018.1-21.714.4-19.415.0-24.014.0-20.0
b 3.8-5.94.0-5.05.0-5.63.83-3.894.32-5.34.3-4.55.3-6.64.0-6.06.0-8.0
c 9.8-20.910.7-17.813.6-16.713.9-13.611.5-16.711.5-13.714.9-19.023.0-37.016.0-20.0
c′ 1.5-3.82.6-2.82.1-2.73.22.8-3.12.5-3.02.1-3.71.0-2.02.0-3.0
Lip region width6-107-88-116-87a 9-1011-14??
Stoma length13-2115-171922-2317-1918-2020-2824-2820-24
Corpus length58-7681-109?13471-11272a ???
Isthmus length35-4127-42?44-5621-3827a ???
Bulb length24-3520-36?33-45?23a ???
Nerve ring-ant. end92-12579-108116-136149-17990-114100-127143-185??
Excretory pore-ant. end113-14487-114127-138155-168110-142119-141137-179??
Pharynx length141-175134-169149-172223-228142-187155-190184-256211-256204-236
Midbody width40-6631-4539-4630-3532-3926-4064-6954-8870-98
Anal body width17-2716-2026-3019-2116-1920-2421-4026-3427-32
Tail length49-6241-5555-5861-6543-5958-6762-7632-5666-78
Spicules length (SL)34-4931-3635-4441-4424-2733-3940-4632-6042-60
Gubernaculum length (GL)16-2813-1719-2014-189-1014-2020-3413-2316-22
GL/SL × 10050-6043-4645-5434-403642-5150-744037-38

Nematode species, GenBank accession number, and origin of the sequences used for phylogenetic study_

GenBank accession number
Speciesa 18S rDNA28S rDNAITS rDNACountryIsolation sourceReference
Ablechroiulus cristatus EU196013EU195976 USAUnknownKiontke et al. (2007)
Ablechroiulus dudichi AF083012 USAUnknownFitch (unpublished)
Auanema rhodensis EU196004 USAUnknownKiontke et al. (2007)
Buetschlinema nidrosiensis EU196020 USAUnknownKiontke et al. (2007)
Bursilla belari MK359049 IndiaSoilPalanisamy et al. (unpublished)
Bursilla sp. EF990722 USAUnknownKiontke et al. (2007)
Caenorhabditis angaria JN636068 USARotting fruits Kiontke et al. (2011)
Caenorhabditis elegans Z92784 UKUnknown Sulston and Waterston (1998)
Caenorhabditis elegans X03680 USAUnknown Ellis et al. (1986)
Caenorhabditis sinica JN636142 USARotting fruits Kiontke et al. (2011)
Cephaloboides cf. armatus EU196005 USAUnknownKiontke et al. (2007)
Crustorhabditis transita EU195995 USAUnknownKiontke et al. (2007)
Cruznema tripartitum U73449 Unknown Baldwin et al. (1997)
Diploscapter coronatus AY593921 NetherlandsSoilHelder et al. (2006)
Diploscapter sp. EU195959 USAUnknownKiontke et al. (2007)
Distolabrellus veechi EF990725 USAUnknownKiontke et al. (2007)
Haematozoon subulatum EU040125 ChinaSoilLi et al. (unpublished)
Haematozoon subulatum AF083017 USAUnknownFitch (unpublished)
Haematozoon subulatum EF990727 USAUnknownKiontke et al. (2007)
Heterorhabditis bacteriophora KJ636408 NetherlandsUnknownvan Megen (unpublished)
Heterorhabditis downesi KU573061IrelandSoil Maher et al. (2016)
Heterorhabditis megidis KJ636320 NetherlandsUnknownvan Megen (unpublished)
Litoditis marina AF083021 USAUnknownFitch (unpublished)
Litoditis marina AM399053 Belgium Fucus sp. Derycke et al. (2008a)
Litoditis marina AM937053GreeceDecaying seaweeds Derycke et al. (2008b)
Litoditis mediterranea AF083020 USAUnknownFitch (unpublished)
Litoditis mediterranea AM399068 New ZealandUnknown Derycke et al. (2008a)
Mesorhabditis anisomorpha AF083013 USAUnknownFitch (unpublished)
Mesorhabditis anisomorpha EF990723 USAUnknownKiontke et al. (2007)
Mesorhabditis longespiculosa EU196014EU195980 USAUnknownKiontke et al. (2007)
Metarhabditis amsactae MT872503, MT872504MT872508, MT872509MT873043, MT873044IndiaSoilPresent study
Metarhabditis amsactae MT422254PhilippinesSoilDichusa et al. (unpublished)
Metarhabditis amsactae MT452472, MT452471PhilippinesSoilSangcopan and Sumaya (unpublished)
Metarhabditis amsactae MH392568, KY083045 KP834433, KP834432IndiaSoilChavan et al. (unpublished)
Metarhabditis amsactae MK973071PakistanSoilTabassum et al. (unpublished)
Metarhabditis blumi U13935 GermanyUnknown Fitch et al. (1995)
Metarhabditis blumi MT043860 PhilippinesSoilAndalan et al. (unpublished)
Metarhabditis blumi MF989442 Colombia Bos indicus Chaves et al. (unpublished)
Metarhabditis blumi MT012150 PhilippinesSoil compostGuadalquiver (unpublished)
Metarhabditis blumi MN453373 IndiaSoilKandhasamy and Muthugounder (unpublished)
Metarhabditis blumi EU195965 USAUnknownKiontke et al. (2007)
Metarhabditis blumi KM233152, KM233153 BrazilCow Bossi et al. (2015)
Metarhabditis blumi DQ121436South AfricaUnknownJumba and Gray (unpublished)
Metarhabditis rainai MT012135, MT012133 PhilippinesSoilKabalu et al. (unpublished)
Metarhabditis rainai MT012153 PhilippinesSoilBuldiman et al. (unpublished)
Metarhabditis rainai JQ237848 USACitrus groves Campos-Herrera et al. (2012)
Metarhabditis rainai AF083008 USAUnknownFitch (unpublished)
Metarhabditis rainai EU195966 USAUnknownKiontke et al. (2007)
Metarhabditis rainai KR011843, KR011846 BrazilSoil de Brida et al. (2017)
Metarhabditis sp. MK973071PakistanSoilTabassum et al. (unplublished)
Myolaimus byersi KU180665KU180676 SwedenUnknown Holovachov et al. (2015)
Oscheius carolinensis FJ547240FJ547239 USAVermicompost Ye et al. (2010)
Oscheius chongmingensis EF503692 ChinaSoil Zhang et al. (2008)
Oscheius chongmingensis EU273599 ChinaSoil Liu et al. (2012)
Oscheius chongmingensis MT548593China Spodoptera frugiperda Li et al. (unpublished)
Oscheius colombianus AY751546 Colombia Cyrtomenus bergi Stock et al. (2005)
Oscheius dolichura EU196010 USAUnknownKiontke et al. (2007)
Oscheius dolichuroides AF082998 USAUnknownFitch (unpublished)
Oscheius dolichuroides EU195970 USAUnknownKiontke et al. (2007)
Oscheius guentheri EU196022 USAUnknownKiontke et al. (2007)
Oscheius indicus MF441252 IndiaSoil Kumar et al. (2019)
Oscheius insectivorus AF083019 USAUnknownFitch (unpublished)
Oscheius insectivorus EU195968 USAUnknownKiontke et al. (2007)
Oscheius myriophilus AY602176 USAUnknown Kiontke et al. (2004)
Oscheius myriophilus MG742117ThailandSoilNitjarunkul et al. (unpublished)
Oscheius myriophilus U13936 USASoil Fitch et al. (1995)
Oscheius necromenus KT884894 Australia Oncocladosoma castaneum Carta et al. (2018)
Oscheius onirici MG551687 PortugalUnknownCampos-Herrera (unpublished)
Oscheius onirici LN613263 ItalySoil Torrini et al. (2015)
Oscheius rugaoensis JQ002566 ChinaSoil Zhang et al. (2012)
Oscheius rugaoensis KT884891 Japan Chamberlinius hualienensis Carta et al. (2018)
Oscheius saproxylicus MK959600MK959601 SpainDecaying wood Abolafia and Pena-Santiago (2019b)
Oscheius tipulae EU195969 USAUnknownKiontke et al. (2007)
Oscheius tipulae KP792649BrazilSoilCampos-Herrera and Pu˚ža (unpublished)
Parasitorhabditis obtusa EF990724 GermanyBark beetlesKiontke et al. (2007)
Parasitorhabditis obtuse EU003189 USAUnknownKiontke et al. (2007)
Pellioditis typica AF036946KenyaFeces of an antelope Adams et al. (1998)
Pelodera pseudoteres EU196023EU195997 USAUnknownKiontke et al. (2007)
Pelodera teres AF083002 USAUnknownFitch (unpublished)
Pelodera teres EU195979 USAUnknownKiontke et al. (2007)
Phasmarhabditis hermaphrodita DQ639980 ScotlandNemaslug MacMillan et al. (2006)
Phasmarhabditis neopapillosa DQ639982 Scotland Arion ater MacMillan et al. (2006)
Phasmarhabditis papillosa KX267675South Africa Deroceras reticulatum Pieterse et al. (2017)
Poikilolaimus floridensis AB370214 USATermites Kanzaki et al. (2009)
Poikilolaimus oxycercus AF083023 USAUnknownFitch (unpublished)
Poikilolaimus oxycercus EU195984 USAUnknownKiontke et al. (2007)
Poikilolaimus piniperdae DQ059060 GermanyUnknown Hong et al. (2005)
Poikilolaimus regenfussi AF083022 USAUnknownFitch (unpublished)
Poikilolaimus regenfussi DQ059057 GermanyUnknown Hong et al. (2005)
Protorhabditis sp.AF083001 USAUnknownFitch (unpublished)
Protorhabditis sp. AY602168 USAUnknownKiontke et al. (2007)
Rhabditella axei U13934 GermanyUnknown Fitch et al. (1995)
Rhabditella axei AY602177 USAUnknown Kiontke et al. (2004)
Rhabditis brassicae EU196006 USAUnknownKiontke et al. (2007)
Rhabditis sp.MN082353, MN082355 TaiwanSoil Yang et al. (2020)
Rhabditoides inermis AF082996 UnknownFitch (unpublished)
Rhabditoides regina EF990726 USAUnknownKiontke et al. (2007)
Rhomborhabditis regina KX385908 MexicoWhite grub Jiménez-Cortés et al. (2016)
Teratorhabditis mariannae EF990716EF990721 USASoil compost Kanzaki et al. (2008)
Teratorhabditis palmarum U13937 USAUnknown Fitch et al. (1995)

Morphometrics of Metarhabditis amsactae (Ali, Pervez, Andrabi, Sharma and Verma, 2011) Sudhaus, 2011 from India_

CharactersFemaleMaleL3
n202020
Body length (L)939 ± 119 (718-1135)800 ± 91 (653-999)383 ± 55 (305-475)
a (L/MBW)16.4 ± 2.7 (10.9-21.1)16.7 ± 2.0 (12.7-20.7)18.9 ± 2.0 (15.7-22.9)
b (L/NL)5.4 ± 0.6 (4.5-6.6)4.9 ± 0.5 (3.8-5.9)3.4 ± 0.5 (2.7-4.3)
c (L/T)10.9 ± 1.7 (8.7-14.0)13.7 ± 2.7 (9.8-20.9)7.5 ± 1.2 (6.0-10.2)
c′ (T/ABW)4.1 ± 0.6 (2.9-5.2)2.9 ± 0.5 (1.5-3.8)4.8 ± 1.0 (3.0-6.0)
V (VA/L × 100)51.2 ± 2.1 (46-56)
Lip region width7.9 ± 1.4 (5-11)7.1 ± 1.1 (6-10)3.3 ± 0.5 (2-5)
Stoma length18.4 ± 2.3 (14-22)17.1 ± 2.3 (13-21)12.8 ± 1.1 (11-15)
Stomatal tube width5.0 ± 0.4 (2.5-3.5)3.5 ± 0.7 (2.5-5.5)?
Pharyngeal corpus length74 ± 5.6 (68-98)68 ± 4.5 (58-76)35 ± 2.9 (30-42)
Metacorpus length31 ± 3.9 (24-36)30 ± 2.6 (24-33)22 ± 2.4 (19-27)
Isthmus length40 ± 5.5 (40-48)39 ± 2.5 (35-41)27 ± 2.6 (23-31)
Bulb length29 ± 2.3 (26-34)29 ± 2.6 (24-35)16.8 ± 2.8 (12-24)
Pharynx length175 ± 13.3 (156-195)166 ± 7.3 (141-175)101 ± 6.5 (88-112)
Nerve ring – anterior end123 ± 15.0 (98-153)112 ± 9.1 (92-125)69 ± 10.9 (53-92)
Excretory pore–anterior end (EP)137 ± 18.2 (110-166)130 ± 9.1 (113-144)78 ± 11.7 (56-103)
Deirid–anterior end133 ± 16.0 (110-167)125 ± 11.0 (107-147)?
Neck length (stoma + pharynx, NL)173 ± 15.0 (148-195)163 ± 8.3 (144-176)114 ± 6.1 (101-124)
Body width at neck base43 ± 5.2 (32-50)38 ± 4.2 (32-50)18.7 ± 2.9 (14-25)
Mid-body width (MBW)58 ± 10.4 (43-81)48 ± 7.2 (40-66)20.5 ± 3.3 (16-29)
Anterior genital branch or Testis260 ± 38.2 (192-372)198 ± 15 (188-222)
Posterior genital branch278 ± 27.5 (229-321)
Vagina length24.5 ± 4.1 (17-30)
Vulva–anterior end (VA)480 ± 64 (380-579)
Rectum length31 ± 6.4 (22-42)15.0 ± 4.0 (9-23)
Anal body width (ABW)22 ± 2.7 (16-28)20.9 ± 2.5 (17-27)11.2 ± 2.2 (9-17)
Tail length (T)87 ± 10.5 (68-101)63 ± 8.2 (49-62)52 ± 5.9 (48-58)
Spicules length41 ± 7.5 (34-49)
Gubernaculum length19.6 ± 3.5 (16-28)
DOI: https://doi.org/10.21307/jofnem-2020-116 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
Language: English
Page range: 1 - 23
Published on: Dec 14, 2020
Published by: Society of Nematologists, Inc.
In partnership with: Paradigm Publishing Services
Publication frequency: 1 times per year

© 2020 Aashaq Hussain Bhat, Shreyansh Srivastava, Aasha Rana, Ashok Kumar Chaubey, Ricardo A. R. Machado, Joaquín Abolafia, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.