Tylencholaimus de Man, 1876

Ahad, Sumaya & Ahmad, Wasim, 2016, Description of two new and six known species of the genus Tylencholaimus de Man, 1876 (Nematoda: Dorylaimida) with a diagnostic compendium and key to species, Zootaxa 4107 (4), pp. 451-490 : 452-454

Tylencholaimus de Man, 1876

= Xenonchium Siddiqi & Khan, 1964

Diagnosis ( Dorylaimida : Tylencholaimidae ): Small sized nematodes, between 0.3 and 1.2 mm in length. Cuticle tylencholaimoid, with irregular radial refractive elements; outer layer generally with fine transverse striations. Lip region always cap-like, offset by constriction or sometimes by depression; lips more or less amalgamated, with the perioral area either transformed into a disc-like structure or not. Cheilostom a truncate cone, often with perioral thickenings. Amphid aperture slit-like, about half as wide as corresponding lip region diameter. Odontostyle somewhat shorter than lip region diameter, its aperture about one-fourth to one-third of total length. odontophore rod-like, with more or less distinct basal knobs. Pharynx consisting of anterior slender part extending gradually or abruptly into the basal expansion with thickened inner lining, which occupies one-third to two-fifths of the total neck length. Cardia usually hemispheroid to rounded-conoid. Female genital system amphidelphic, monoprodelphic or mono-opisthodelphic. Vulva transverse. Males with dorylaimoid spicules, lateral guiding pieces and a few spaced (very rarely numerous and contiguous) ventromedian supplements. Tail similar in sexes, elongateconoid to hemispherical.

Type species: Tylencholaimus mirabilis ( Bütschli, 1873) de Man, 1876

= Tylenchus mirabilis Bütschli, 1873

= Dorylaimellus mirabilis ( Bütschli, 1873) Thorne, 1939

= Dorylaimellus (Tylencholaimus) mirabilis ( Bütschli, 1873) Meyl, 1953

= Discomyctus brevicaudatus Tarjan, 1953

= Tylencholaimus brevicaudatus ( Tarjan, 1953) Tarjan, 1956

Other species:

T. airolensis Loof & Jairajpuri, 1968

T. americanus Peña-Santiago & Coomans, 1996

T. arakii sp. n.

T. asymmetricus Khan & Ahmad, 1994

T. australis Yeates, 1979

T. cedari ( Siddiqi & Khan, 1964) Jairajpuri & Ahmad, 1992 = Xenonchium cedari Siddiqi & Khan, 1964

T. chathami Yeates, 1979

T. confusus Ahmad & Araki, 2003

T. congestus Loof & Jairajpuri, 1968

T. conicuadatus Peña-Santiago & Coomans, 1994

T. constrictus Vinciguerra, 1986

T. cosmos ( Dhanam & Jairajpuri, 1999) Peña-Santiago, 2008 = Amphitylencholaimus cosmos Dhanam & Jairajpuri, 1999

T. crassus Loof & Jairajpuri, 1968

T. cynodonti Nasira, Erum & Shahina, 2005

T. decens Andrássy, 1991

T. formosus Loof & Jairajpuri, 1968

T. gallaicus Seijas, Hernandez, Abolafia & Peña-Santiago, 2007

T. gertii Kruger, 1965

T. ibericus Peña-Santiago & Coomans, 1994 = T. japonicus Ahmad & Araki, 2003

T. imperanus Mohilal & Dhanachand, 2003 = Tylencholaimus (Discotylencholaimus) imperanus Mohilal & Dhanachand, 2003 = Tylencholaimus (Discotylencholaimus) lokus Mohilal & Dhanachand, 2003

T. innebus Ahmad & Jairajpuri, 1979

T. koreanus Ahmad, Park, Lee & Choi, 2009

T. ladakhiensis sp. n.

T. leptodorus Monteiro, 1970

T. leptonchoides Loof, 1964

= T. macrurus Siddiqi, 1964

= T. similis Jairajpuri, 1965

T. longicaudatus Peña-Santiago & Coomans, 1994

T. loofi Dhanachand, 1994

= T. minutus apud Dhanachand, Mohilal & Joymati, 1992

T. maritus Loof & Jairajpuri, 1968

= Tylencholaimus sp. Loof, 1964

T. micronanus Yeates, 1979

= T. vanguimus Mohilal & Dhanachand, 2000

T. minimus de Man, 1876

T. minutus Vinciguerra, 1986

T. mongolicus Andrássy, 1967

T. nagauriensis Baqri & Bohra, 2001

T. nanus Thorne, 1939

T. notrus Khan, Jairajpuri & Ahmad, 1990

T. obscurus Jairajpuri, 1965

= T. dorae Kruger, 1965

T. orientalis Li, Baniyamuddin, Ahmad & Wu, 2008

T. paracrassus Monteiro, 1970

T. parvus Ahmad & Araki, 2003

T. pini Mushtaq, Naz & Ahmad, 2007

T. porosus Vinciguerra & Zullini, 1980

T. proximus Thorne, 1939

T. pusillus Loof & Jairajpuri, 1968

T. rumjhumi Khan & Laha, 1982

T. savaryi Loof & Jairajpuri, 1968

T. sinensis Li, Baniyamuddin, Ahmad & Wu, 2008

T. singaporensis Ahmad & Baniyamuddin, 2010

T. stecki Steiner, 1914

= T. alpinus Vinciguerra, 1982

T. suryawanshii Ali & Chisty, 1972

T. tahatikus (Yeates, 1967) Siddiqi, 1968 = Dorylaimellus tahatikus Yeates, 1967

T. teres Thorne, 1939

T. terrestris Peña-Santiago & Coomans, 1996

T. vigil Andrássy, 1959

T. vulvulatus Rahman, Jairajpuri, Ahmad & Ahmad, 1987

= Protylencholaimus longisaccus Dhanam & Jairajpuri, 1999

Ahad & Ahmad (2016) recently transferred T. pakistanicum to the genus Tantunema Siddiqi, 1982 , and hence it is not included in this list.