Hopperia

Pastor, Catalina T. & Ward, De, 2004, New species of Hopperia (Nematoda, Comesomatidae) and Metachromadora (Nematoda, Desmodoridae) from Patagonia, Chubut, Argentina, Zootaxa 542, pp. 1-15 : 9

Key to all known species of Hopperia

1 Stoma armed with three odontia situated at juncture of cyathiform and tubular portion of the stoma; interchordal punctuations in circumferential rows................................. 2

1' Stoma armed with six odontia situated at juncture of cyathiform and tubular regions of the stoma; interchordal punctuations irregularly distributed (12–14 precloacal suppl.; spic. 101, 2 abd; ov. outstreched) ............. Hopperia hexadentata Hope & Zhang 1995

2 Length of posterior cylindrical region of the stoma larger than 1,5 amphid diameters 3

2’ Length of posterior cylindrical region of the stoma smaller than 1,5 amphid diameters (12 precloacal supplements; spicules 44 µm long, 0.5 abd; ov. outstretched) ................ ........................................................................................................ H. patagonica n. sp.

3 Length of posterior cylindrical region of the stoma between 1,5 and 2,5 amphid diameters ....................................................................................................................................... 4

3’ Length of posterior cylindrical region of the stoma larger than 2,5 amphid diameters 5

4 Spicules shorter than or equal to 2.0 abd ...................................................................... 6

4’ Spicules longer than 2 abd (precloacal suppl. present; Spic. 87.0 µm, 2.5 abd, ov. outstreched) .......................................................................... H. muscatensis Warwick 1973

5 More than 10 precloacal supplements (20–21 precloacal suppl.; Spic. 69.0 µm long, 1.5 abd, ov. outstretched ............................................. H. indiana Muthumbi et al. 1997

5’ Less than 10 precloacal supplements (8 precloacal suppl.; Spic. 37.0–44.0 µm, 1.5 abd, ov. outstretched) .............................................................. H. australis Jensen 1992

6 Tail tip not swollen........................................................................................................ 7

6’ Tail tip swollen .............................................................................................................. 8

7 Reflexed ovaries (8 precloacal suppl., spic. 40.0 µm, 2 abd) ......................................... .............................................................................. H. dorylaimopsoides ( Allgen, 1959)

7’ Outstretched ovaries (6–7 precloacal suppl., spic 54,8 µm, 1,5 abd).............................. ................................................................................... H. beaglense Chen & Vincx 1998

8 Number of precloacal supplements greater than 10 (13–16 precloacal suppl., spic. 52.0–54.0 µm long, 1.3 abd, ov. reflexed) ....................... H. massiliensis Vitiello 1969

8’ Number of precloacal supplements smaller than 10 (6 precloacal suppl., ov. outstretched) spic. 54.0 µm, 1.4 abd ........................... H. americana Pastor de Ward 1984 spic. 48.7µm, 1.8 abd ....................................................... H. arntzi Chen & Vincx 1998