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S. Álvarez-Ortega et al. Metaporcelaimus subhasi comb. n.: The conical elongate tail with finely rounded or acute tip of this species supports its inclusion in Metaporcelaimus. Its original description is of poor quality, lacking many relevant morphological details. It is very similar, if not identical, to M. chauhani, a widely distributed species in India, and might be its junior synonym. Key to species 1. Pars refringens vaginae absent...................2 Pars refringens vaginae present, with two well developed sclerotised pieces . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2. Lip region 12-13 μm wide; odontostyle 14 μm long .............................cylindricus comb. n. Lip region > 14 μm wide; odontostyle > 15 μm long ...............................................3 3. Lip region 20-22 μm wide; odontostyle 20-21 μm long; V = 59-61.................shamimi comb. n. Lip region < 20 μm wide; odontostyle < 19 μm long; V 58...................................4 4. Body 2.6-3.1 mm long; neck 700-760 μmlong..... .......................................oceanicus Body < 2.5 mm long; neck < 550 μmlong.......5 5. Lip region offset by more or less marked depression; tail lacking any dorsal concavity . . . . . . . . . . . . . . . . . 6 Lip region offset by constriction; tail bearing a more or less developed dorsal concavity . . . . . . . . . . . . . . . 7 6. Body 2.40-2.45 mm long and more slender (a = 49- 50); pharyngeal expansion occupying 56-57% of total neck length; uterus > 2 body diam. long . . . . . . . . . . . .................................indicus comb. n. Body 1.51-2.09 mm long and more obese (a = 30- 40); pharyngeal expansion occupying 48-56% of total neck length; uterus < 1.5 body diam. long . . . . . . . . . ................................insignis comb. n. 7. Body more slender (a = 38-51); comparatively shorter neck (b = 4.3-4.8); pharyngeal expansion occupying 45-52% of total neck length; male present . . ....................................ahmadi sp. n. Body more obese (a = 32-33); comparatively longer neck (b = 3.8-4.1); pharyngeal expansion occupying 53-55% of total neck length; male absent . . . . . . . . . . .......................................coomansi 8. Female tail conical with subacute or acute tip . . . . . 9 Female tail conical with more rounded terminus . . 11 9. Vulva more anterior, V 54; shorter neck, 1.5 mm long (including A. parangalitzi, 1.44- 1.99 mm long) and more slender (a 26). . . . . . . .12 12. Odontostyle up to 20 μmlong..................13 Odontostyle > 20 μm long (including A. capitatus 19-23 μm long) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 13. Longer body, L > 2.50mmlong................14 Shorter body, L < 2.50 mm long . . . . . . . . . . . . . . . . 18 14. Female tail shorter, c ′ = 1.0-1.3.................15 Female tail longer, c ′ 1.4.....................16 15. Vulva more anterior, V = 49-53; 10-12 regularly spaced ventromedian supplements, the posteriormost one or two lying within range of spicules. . . . . . . . . . . ......................................romanicus Vulva more posterior, V = 58; 8-9 regularly spaced ventromedian supplements lying outside range of spicules..........................thornei comb. n. 16. Body distinctly narrowing at level of odontophore base; odontostyle 14-16 μmlong..........labiatus Body not distinctly narrowing at level of odontophore base; odontostyle 19-20 μmlong...............17 17. Body 2.8-2.9 mm long; neck 644-705 μm long; male absent......................donghwaens comb. n. Body 3.1-3.2 mm long; neck 711-721 μm long; male present...............................sublabiatus 18. Female tail shorter, c ′ = 1.1-1.2.................19 Female tail longer, c ′ 1.3.....................20 19. Body 2.0 mm long; smaller odontostyle aperture (occupying ca 66% of total length); tail 50 μm long ...............................raniensis comb. n. Body 1.8 mm long; larger odontostyle aperture (occupying ca 75% of total length); tail 36 μm long. . . . ........................................efficiens 20. Lipregion12μm wide; pharyngeal expansion occupying 53-57% of total neck length . . . . . . . . . . . . . . . . . ............................parangalitzi comb. n. Lip region > 14 μm wide; pharyngeal expansion occupying
Studies on Metaporcelaimus 21. Longer neck (b = 3.6-4.2); tail 35-44 μm long; male absent.......................ovogranulosus sp. n. Shorter neck (b 4.2); tail > 45 μm long; male present.......................................22 22. Lip region 14-15 μm wide; odontostyle, 13-15 μm long; spicules 54-63 μmlong.....marinensis sp. n. Lip region 15-17 μm wide; odontostyle, 15-19 μm long; spicules 71-79 μmlong...........mombucae 23. Tail lacking any dorsal concavity . . . . . . . . . . . . . . . 24 Tail bearing a more or less developed dorsal concavityatitsposteriorhalf.........................28 24. Uterus < 1.0 body diam. long; inner core of tail not distinctly notched dorsally and ventrally . . . . . . . . . 25 Uterus > 2.0 body diam. long; inner core of tail distinctly notched dorsally and ventrally . . . . . . . . . 26 25. Body 3.04 mm long; odontostyle 20 μm long; tail 66 μmlong.........................monohystera Body 1.5-2.4 mm long; odontostyle 22-24 μm long; tail 30-43 μmlong..............conoidus comb. n. 26. Body up to 2.5 mm long; lateral chord lacking gland bodies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .capitatus Body > 2.5 mm long; lateral chord with abundant gland bodies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 27. Body 2.8-3.2 mm long; neck shorter (b = 5.3-6.2); malepresent.....................parmus comb. n. Body 2.5-2.8 mm long; neck longer (b = 4.7-5.2); maleabsent.......................placus comb. n. 28. Body length 3.04-3.32 mm long . . . . . . . . . . . digitalis Body length < 2.5mmlong....................29 29. Body more obese (a = 26-33); lip region 19-20 μm wide; female tail longer (39-45 μm, c = 38-45). . . . . .........................................adoxus Body more slender (a = 37-47); lip region 16-17 μm wide; female tail shorter (31-36 μm, c = 55-69) . . . . ..........................................invisus Table 3 provides a compendium of Metaporcelaimus species with taxonomically important morphometrics characters and information on its current distribution. Acknowledgements The authors especially thank the financial support received from the project entitled Fauna Ibérica: Nematoda, Dorylaimoidea (excepto Longidoridae) (Spanish Ministry of Science and Innovation, ref. CGL2007-66786-C08-08; co-financed FEDER). The first author thanks the ‘Estancias Breves’ Programme, also of the Spanish Ministry of Science and Innovation, for financing a research stay at the Plant Pest Diagnostics Center (California Department of Food and Agriculture, Sacramento, California, USA), of which the Director is also thanked for the facilities given. References Ahmad, W. (1995). Studies on the genus Aporcelaimellus Hens, 1965 (Dorylaimida: Aporcelaimidae) from India. Fundamental and Applied Nematology 18, 219-225. Allgén, C.A. (1953). Terrestrial nematodes from Mayen. Annals and Magazine of Natural History 6, 665-688. Altherr, E. (1952). Les nematodes du Parc National Suisse (Nematodes libres du sol). 2e partie. Ergebnisse der wissenschaftlichen Untersuchung des schweiszerischen Nationalparks 26, 315-356. Altherr, E. (1953). Nématodes du sol du Jura vaudois et français. I. Bulletin de la Société Vaudoise des Sciences Naturelles 65, 429-460. Altherr, E. (1963). Contribution a la connaissance de la faune des sables submergés en Lorraine. Nematodes. Annales de Spéléologie 18, 53-98. Altherr, E. (1968). Nématodes de la nappe phréatique du réseau fluvial de la Saale (Thuringe) et psammiques du Lac Stechlin (Brandebourg du Nord). Limnologica 6, 247-320. Altherr, E. (1974). Nématodes de la nappe phréatique du réseau fluvial de la Saale (Thuringe), II. Limnologica 9, 81-132. Altherr, E. & Delamare-Deboutteville, C. (1972). Nématodes interstitiels des eaux douces des États-Unis d’Amérique (États de Washington, du Colorado et du Massachusetts) récoltés par Cl. Delamare Deboutteville. Annales de Spéléologie 27, 683- 760. Altherr, E. & Loof, P.A.A. (1969). Paraxonchium Krall, 1958, a valid generic name. Nematologica 15, 431-432. Álvarez-Ortega, S. & Peña-Santiago, R. (2010a). Studies on the genus Aporcelaimellus Heyns, 1965 (Dorylaimida: Aporcelaimidae) – Redescription of six species studied by Thorne in 1974. Journal of Nematode Morphology and Systematics 13, 67-89. Álvarez-Ortega, S. & Peña-Santiago, R. (2010b). Studies on the genus Aporcelaimellus Heyns, 1965 (Dorylaimida: Aporcelaimidae) – material studied by Thorne and Swanger in 1936 but not named. Russian Journal of Nematology 18, 69-84. Álvarez-Ortega, S. & Peña-Santiago, R. (2011). Studies on the genus Aporcelaimellus Heyns, 1965 (Dorylaimida: Aporcelaimidae). Species from Sri Lanka originally studied by Loos. Nematology 13, 193-209. Álvarez-Ortega, S. & Peña-Santiago, R. (2012). Nematodes of the order Dorylaimida from Andalucía Oriental, Spain. Nevadanema nevadense gen. n., sp. n. (Qudsianematidae) from Sierra Nevada National Park. Nematology 14, 249-264. Vol. 00(0), 2012 25
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