Instituto Nacional
de Tecnología Agropecuaria 

Estación Experimental
Agropecuaria Balcarce

[ Principal ] [ Arriba ] [ Actividades ] [ Información ] [ Institucional ] [ Contactos ] [ Actualidad ]

Inicio > Información > Pósters

On the occurrence of the genus Tubixaba Monteiro & Lordello, 1980 (Dorylaimida, Aporcelaimidae) in Argentina.

Eliseo Chaves¹, Pablo Guerrero², Joaquín Abolafia² and Reyes Peña-Santiago².

¹Inta - Estación Experimental de Balcarce, 7620 - Balcarce, Argentina. E-Mail:echaves@balcarce.inta.gov.ar

²Departamento de Biología Animal, Vegetal y Ecología, Universidad de Jaén, Campus "Las Lagunillas"

s/n, Edificio 83. 23071 - Jaén, Spain. E-mail:pguerre@ujaen.es - abolafia@ujaen.es - rpena@ujaen.es

Click para ampliar

The genus Tubixaba: a brief historical outline

Monteiro and Lordello (1980) originally described Tubixaba tuxaua from rhizosphere of soybean in Paraná, Brazil. The new genus was characterized by having very large body (L=9.44-11.66), inner cuticle layer with criss-cross lines, axial spear with aperture occupying one-third of its length, pharyngeal expansion occupying about two-thirds of total neck length, pars refringens vaginae absent, and tail short conoid in both sexes.

Some years later, three species were recorded from southern Africa: T. parva Pretorius, Kruger & Heyns, 1987, T. tswanorum Nell & Heyns, 1987, and T. minima Botha & Heyns, 1990. Nevertheless, de Bruin and Heyns (1991), considered T. tswanorum as a junior synonym of T. parva. African species differ from Brazilian T. tuxaua in their smaller general size, but otherwise fit well the genus diagnosis. 

Popovici (1995) described T. saccata from Romania. This species is easily separated from the others by having well developed pars refringens vaginae and abundant sac-like bodies in tail cuticle.

The four known species display a widely separated disjunction pattern. Meanwhile the distribution of Brazilian and South African species might be explained on the basis of an ancient Godwanian spread, the presence of T. saccata in natural areas from Central Europe suggests a more primitive Pangean origin of tentative common ancestor.

The genus Tubixaba in Argentina

One of the authors (E.C.) collected a few specimens belonging to the genus Tubixaba in soil samples from Argentina.

The material studied is:

- two females collected from

- one female collected from

These specimens certainly belong to two different species.

General morphology of these specimens fits very well that of South African species: big (but not excessively big) size, pars refringens vaginae absent, and tail lacking saccate bodies.

They differ from Brazilian T. tuxaua in their significantly smaller body (vs L=9.44-11.66), and from Romanian T. saccata in the absence of pars refringens vaginae (vs present) and of abundant blister-like structures in tail cuticle (vs present).

However, the differences with South African species are finer, mainly morphometrical, but apparently relevant.

Anyway, additional material of Argentinian populations should be obtained to describe them as new species.

Click para ampliar

3b - Body longer (L=5.6 - 5.7) and more slender (α=64 - 67); tail cuticle three-layered and lacking saccate bodies; males unknown..................... ..........................................................................................................................................................................................................Tubixaba sp.1

4a - Body shorter (L=1.7 - 2.1) and more robust (α=29 - 34) uterus up to twice the corresponding body diameter..................................T. minima

4b - Body longer (L=3.3 - 5.0) and more slender (α=39 - 69); uterus more than four times the corresponding body diameter................................5

5a - Tail cuticle two-layered; males not known...........................................................................................................................Tubixaba sp. 2    
           5b - Tail cuticle three-layered; males as frequent as females.................................................................................................................T. parva

Measurements of Tubixaba species
 

Measurements in µm (except L in mm)

Character Species   n L a b c V c1 Lip width Odonto- style Odonto- phore Neck Pre- rectum Analbody width Tail Spicules Ventr. suppl Country Reference T. minima   14 1.7-2.1 29-34 3.6-4.7 62-91 47-55 0.6-0.9 15.5-17.5 16.5-19.0 30- 34 390-570 114-170 30- 41 23-31     South Africa Botha & Heyns, 1990 T. parva 13 33-44 39-53 5.1-7.9 79-144 46-56 0.5-0.8 16- 19 14- 17 25- 28 505-674 45- 58 25-48 South Africa Pretorius et al, 1987 12 3.4-4.2 41-51 5.3-7.2 89-39 0.6-0.8 15- 17 25- 39 538- 690 45- 53 43- 53 80-88 8- 11 3.7 44 7.8 115 56 0.7 19 18 33 470 365 45 32 South Africa Botha & Heyns, 1990 3.8 40 5.1 92 0.8 18 18 33 740 50 41 113 14 6 4.0-4.5 44-59 6.1-7.4 128-151 52-55 0.6-0.8 17- 18 17- 19 32- 35 610-675 444 29-34 South Africa De Bruin & Heyns, 1991 3.6 52 6.5 135 0.7 19 16 560 27 77 13     16 3.3-3.8 44-59 5.2-6.5 79-100 51-56 0.7-0.9 15- 18 16- 18 25- 29 510-650 203-488   34-45     Bostwana De Bruin & Heyns, 1991 3.7 52 6.0 87 0.9 16 16 28 610 42 86 7 Bostwana Nell & Heyns, 1987 as T. tswanorum 5 4.3-4.6 46-55 4.4-6.0 128-145 53-57 0.6-0.7 15- 18 17- 18 29- 30 750-1031 30-35 Bostwana Nell & Heyns, 1987 7 4.1-5.0 52-69 5.9-6.7 116-166 0.7-0.8 17- 19 17 22- 32 668-813 33-40 92- 114 11- 13 T. saccata 6 2.1-2.7 29-37 3.6-4.4 49-83 52-59 0.6-0.8 18- 20 21- 23 26 27 590-635 128- 188 47-63 33- 13 48 Romania Popovici, 1995 13 2.2-3.1 33-45 3.8-5.3 63-91 0.6-0.8 17- 20 20- 23 26- 32 572-662 150-268 45- 53 32-38 72- 80 22- 28 T. tuxaua 3 9.4-11.7 58-64 6.4-7.6 147-179 51-52 0.5-0.7 26* 31- 33 1480-1640 64-69 Brazil Monteiro & Lordello, 1980 3 10.8-11.0 67-71 6.2-6.6 149-180 0.6-0.7 30- 32 1633-1733 60-72 200- 204 12- 13 16 9.2-12.3 58-71 5.8-7.7 135-178 48-52 0.5-0.8 27- 32 29- 32 1680-1850 112- 119 73-87 Brazil Vovlas et al, 1987 8 10.7-12.8 67-68 5.3-7.1 107-150 0.6-1.0 28-31 30-32 1700-2110 110- 121 90-120 195- 206 Tubixaba sp. 1   2 5.6-5.7 64-67 6.3 118-133 48-50 0.8 20 24 35 894 ? 57- 60 43-48     Argentina Present communication Tubixaba sp. 1   4.2 53 6.4 104 50 0.8 18 18 31 668 178 49 41     Argentina Present communication

References
 

Botha, A. & Heyns, J. 1990. Aporcelaimidae (Nematoda: Dorylaimida) from the Kruger National Park. Koedoe, 33: 27-46.

Bruin, S. de & Heyns, J. 1991. On the identity of Tubixaba parva Pretorius, Kruger & Heyns, 1987, and Tubixaba tswanorum Nell & Heyns, 1987 (Nematoda: Aporcelaimidae). Afro-Asian Journal of Nematology, 1: 123-129.

Monteiro, A.R. & Lordello, L.G.E. 1980. Tubixaba tuxaua n. g. n. sp., a suspected parasitic nematode of soybean roots (Aporcelaimidae). Revista de Agricultura, Piracicaba, 55: 301-304.

Nell, N. & Heyns, J. 1987. A new species of Tubixaba Monteiro & Lordello, 1980 from Bostwana (Nematoda: Dorylaimida). Phytophylactica, 19: 433-436.

Popovici, I. 1995. New species of Tubixaba and Enchodelus (Nematoda: Dorylaimida) from Romania. Nematologica, 41: 435-448.

Pretorius, E.M.; Kruger, J.C. de W. & Heyns, J. 1987. A new species of Tubixaba Monteiro & Lordello, 1980 (Dorylaimida: Aporcelaimidae) with an emendation of the genus. Koedoe, 30: 41-47.

Vovlas, N.; Lamberti, F.; Antonio, H.; Monteiro, A.R. & Sharma, R.D. 1987. Morphological characteristics of Tubixaba tuxaua Monteiro & Lordello (Nematoda: Aporcelaimidae). Nematologia Brasileira, 11: 292-299.

© Copyright 2002. INTA EEA Balcarce. Ruta 226 km 73,5 (7620) Balcarce, Buenos Aires, Argentina. Tel: 02266-439100, Fax: 439101, Email: intaba@balcarce.inta.gov.ar