Trefusia de Man, 1893

Leduc, Daniel, Zhao, Zeng Qi & Sinniger, Frederic, 2020, Halanonchus scintillatulus sp. nov. from New Zealand and a review of the suborder Trefusiina (Nematoda: Enoplida), European Journal of Taxonomy 661 (661), pp. 1-45 : 17-18

Genus Trefusia de Man, 1893

Bognenia Allgén, 1932 .

Diagnosis (modified from Leduc 2013)

Trefusiinae . Cuticle smooth or striated. Six jointed outer labial setae situated in separate circle from the cephalic setae; the latter situated either slightly anterior to, at same level as, or posterior to amphids. Amphideal fovea circular, oval, unispiral, spiral, elongated or pocket-shaped. Buccal cavity small or minute, funnel-shaped, not cuticularized. Males with mid-ventral row of pharyngeal supplements that may be papilliform, setiform, or complex; sometimes two additional subventral rows are also present. Precloacal supplements usually present, papilliform or setiform. Arcuate or almost straight spicules, with or without capitulum; gubernaculum present or absent. Male reproductive system diorchic. Female reproductive system with two opposed and reflexed ovaries. Tail conico-cylindrical or filiform. Eighteen species.

Type species

Trefusia longicauda de Man, 1893 .

Other valid species

T. americana Keppner, 1992 .

T. axonolaimoides Allgén, 1953 .

T. conica Gerlach, 1957 .

T. cornea Gerlach, 1958 .

T. curvispiculosa Vincx & Vanreusel, 1989 .

T. filicauda Allgén, 1933 .

= T. longispiculosa Bresslau & Schuurmans Stekhoven, 1940 .

T. helgolandica Riemann, 1966 .

T. honessi Keppner, 1986 .

T. litoralis ( Allgén, 1932) De Coninck & Schuurman Stekhoven, 1933 .

= Bognenia litoralis Allgén, 1932 .

T. longicorpa Keppner, 1986 .

T. multipapillatum Bouwman, 1981 .

T. piperata Leduc, 2013 .

T. pseudolitoralis Vitiello, 1970 .

T. schiemeri Ott, 1977 .

T. spatulata Keppner, 1992 .

T. varians Gerlach, 1955 .

T. zostericola Allgén, 1933 .

Species inquirendae

T. filum Schuurmans Stekhoven, 1942 .

T. longiseta Allgén, 1947 .

T. nidrosiensis Allgén, 1933 .

T. obtusicaudata Allgén, 1933 .

Remarks

Keppner (1992) and Leduc (2013) provided keys to the males of the genus based on Riemann (1966). De Coninck & Stekhoven (1933) synonymised Bognenia with Trefusia . No male specimens have yet been described for Trefusia varians . Trefusia filum , T. longiseta , T. nidrosiensis and T. obtusicauda were considered species inquirendae by Riemann (1966). The latter author also synonymised T. longispiculosa with T. filicauda . In his PhD thesis, Bussau (1993) described T. dominatrix Bussau, 1993 and T. attenuata Bussau, 1993 , but these species are considered nomina nuda because the descriptions were not published.