Abstract
One new and one known (but uncommon) species of the genus Ablechroiulus are described and illustrated from natural areas in the Iberian Peninsula. Ablechroiulus spelaeus sp. n. is characterized by having body length 0.81–1.48 mm in females and 0.74–1.20 mm in males, lip region nearly continuous and 9–13 μm wide, stoma 23–29 µm long or 1.8–2.7 times the lip region width, neck 166-265 μm long, metacorpus well differentiated, oviduct with a small sac, V = 55–59, female tail (51–60 µm, c = 14–25, c' = 1.9–2.7) with two marked sections, male tail (52, 58 µm, c = 14.3, 20.7, c' = 2.0) with filiform posterior part, bursa leptoderan and with nine pairs of papillae (1+2/1+2+1+2), spicules 40, 44 µm long having a terminal protuberance, and gubernaculum 20, 24 µm long. Furthermore, one female of A. dudichi Andrássy, 1970 is described from the north of the Iberian Peninsula. Descriptions, measurements and illustrations are presented for the two species, and SEM pictures are provided for A. spelaeus sp. n. The identity of Ablechroiulus is discussed, including a historical outline, its morphological characterization, and a discussion on the status of several of its species. An emended diagnosis of the genus is provided as well as a list of its species and a key to their identification.
References
Abolafia, J. & Peña-Santiago, R. (2005) Nematodes of the order Rhabditida from Andalucía Oriental: Pseudacrobeles elongatus (de Man, 1880) comb. n. Nematology, 7, 917–926.
Abolafia, J. & Peña-Santiago, R. (2006) Nematodes of the order Rhabditida from Andalucía, Spain. The family Panagrolaimidae, with a compendium of species of Panagrolaimus and a key to their identification. Journal of Nematode Morphology and Systematics, 8 (2005), 133–159.
Abolafia, J. & Peña-Santiago, R. (2009) Nematodes of the order Rhabditida from Andalucía Oriental, Spain. The genus Ablechroiulus Andrássy, 1966 with description of three new species and a key to species. Nematology, 11, 77–94.
Andrássy, I. (1966) Erd- un Süsswasser-Nematoden aus Ghana. Klasse Secernentea (Phasmidia). Annales Universitatis Scientiarum Budapestensis de Rolando Eötvös nominatae - Sectio Biologica, 8, 5–24.
Andrássy, I. (1970) Freilebende Nematoden aus Vietnam. Opuscula Zoologica Instituti Zoosystematici Universitatis Budapestinensis, 10, 5–31.
Andrássy, I. (1976) Evolution as a basis for the systematization of nematodes. London, Pitman Publishing, 288 pp.
Andrássy, I. (1982) Six new species of the suborder Rhabditina. Revue de Nématologie, 5, 39–50.
Andrássy, I. (1983) A taxonomic review of the suborder Rhabditina (Nematoda: Secernentia). ORSTOM, Paris, 241 pp.
Andrássy, I. (1984) Klasse Nematoda (Ordnungen Monhysterida, Desmoscolecida, Araeolaimida, Chromadorida, Rhabditida). Bestimmungsbücher zur Bodenfauna Europas, No. 9. Berlin, Deutschland, Akademie Verlag, 509 pp.
Andrássy, I. (1987) The free-living nematode fauna of the Kiskunság National Park. In: The Fauna of the Kiskunság National Park: 15–46.
Andrássy, I. (2005) Free-living nematodes of Hungary (Nematoda errantia), Volume 1. Pedozoologica Hungarica, 3, 518 pp.
Baermann, G. (1917) Eine einfache Methode zur Auffindung von Ankylostomum (Nematoden) Larven in Erdproben. Geneeskunding Tijdschrift voor Nederlandsch-Indië, 57, 131–137.
Bastian, H.C. (1865) Monograph on the Anguillulidae, or free nematoids, marine, land, and freshwater; with descriptions of 100 new species. Transactions of the Linnean Society of London – Zoology, 25, 73–184.
Buckley, J.J.C. (1931) On a new species of Rhabditis found in an ice-chest. Journal of Helminthology, 9, 197–204.
De Ley, P., Van de Velde, M.C., Mounport, D., Baujard, P. & Coomans, A. (1995) Ultrastructure of the stoma in Cephalobidae, Panagrolaimidae and Rhaditidae, with a proposal for a revised stoma terminology in Rhabditida (Nematoda). Nematologica, 41, 153–182.
Dougherty, E.C. (1955) The genera and species of the subfamily Rhabditinae Micoletzky, 1922 (Nematoda): a nomenclatorial analysis –including an addendum on the composition of the family Rhabditidae Örley, 1880. Journal of Helminthology, 29, 105–152.
Dujardin, F. (1845) Histoire naturelle des helminthes ou vers intestinaux. Paris: 654 pp.
Flegg, J.J.M. (1967) Extraction of Xiphinema and Longidorus species from soil by a modification of Cobb's decanting and sieving technique. Annals of applied Biology, 60, 429–437.
Fuchs, G. (1931) Einige neue Rhabditis–Arten. Zoologische Jahrbücher (Systematik), 62, 119–148.
Goodey, T. (1943) On Rhabditis curvicaudata (Schneider) and R. paraciliata n. sp. Journal of Helminthology, 21, 10–17.
Hirschmann, H. (1952) Die Nematoden der Wassergrenze mittelfränkischer Gewässer. Zoologische Jahrbücher (Systematik), 81, 313–407.
Holovachov, O. (2004) Nematodes (Nematoda). In:Zagorodniuk, I. (Ed.) Cave Fauna of Ukraine. Kyiv, pp. 42–44 (in Ukrainian).
Holterman, M., Van Der Wurff, A., Van Den Elsen, S., Van Megen, H., Bongers, T., Holovachov, O., Bakker, J. & Helder, J. (2006) Phylum-wide analysis of SSU rDNA reveals deep phylogenetic relationships among nematodes and accelerated evolution toward crown clades. Molecular Biology and Evolution, 23, 1792–1800.
Kiontke, K. & Fitch, D.H.A. (2005) The Phylogenetic relationships of Caenorhabditis and other rhabditids. In: Girard, L. R. (Ed.) WormBook, The C. elegans Research Community, WormBook, doi/10.1895/wormbook.1.11.1, http://www.wormbook.org, pp. 1–11.
Osche, G. (1952) Systematik und Phylogenie der Gattung Rhabditis (Nematoda). Zoologische Jahrbücher – Abteilung für Systematik, Ökologie und Geographie der Tiere, 81, 190–280.
Paesler, F. (1946) Beitrag zur Kenntnis der im Dünger lebenden Nematoden. Österreichische Zoologische Zeitschrift, 1, 87–128.
Rahm, G.M. (1928) Alguns nematodes parasitas e semi–parasitas das plantas culturaes do Brasil. Archivos do Instituto de Biologia e Defensa Agricola e Animal, 1, 239–251.
Reiter, M. (1928) Zur Systematik und Ökologie der zweigeschlechtlichen Rhabditiden. Arbeiten aus dem Zoologischem Institut der Universität Innsbruck, 3, 91–184.
Rühm, W. (1950) Die Nematoden der Borkenkäfer. Dissertation Erlangen, 335 pp.
Siddiqi, M.R. (1964) Studies on Discolaimus spp. (Nematoda: Dorylaimidae) from India. Zeitschrift für Zoologische Systematik und Evolutionsforschung, 2, 174–184.
Southern, R. (1909) On the anatomy and life-history of Rhabditis brassicae n. sp. Journal of Ecology and Biology, 3, 91–95.
Sudhaus, W. (1976) Nomenklatorische Bemerkungen über Arten und Gattungen der Unterfamilie Rhabditinae sensu lato (Rhabditidae, Nematoda). Nematologica, 22, 49–61.
Sudhaus, W. & Fitch, D. (2001) Comparative studies on the phylogeny and systematics of the Rhabditidae (Nematoda). Journal of Nematology, 33, 1–70.
Sudhaus, W. & Kühne, R. (1990) Nematodes associated with psychodidae: description of Rhabditis berolina sp. n. and redescription of R. dubia Bovien, 1937 (Nematoda: Rhabditidae), with biological and ecological notes, and a phylogenetic discussion. Nematologica, 35 (1989), 305–320.