Identification key to species of the genus Perepsilonema Lorenzen, 1973 Key created by Oleksandr Holovachov
Please refer to this identification key as Holovachov, O. (2018) Identification key to species of the genus Perepsilonema Lorenzen, 1973. In: Bezerra, T.N.; Decraemer, W.; Eisendle-Flöckner, U.; Holovachov, O.; Leduc, D.; Miljutin, D.; Sharma, J.; Smol, N.; Tchesunov, A.; Mokievsky, V.; Venekey, V.; Vanreusel, A. (2018) NeMys: World Database of Free-Living Marine Nematodes. Accessed at http://nemys.ugent.be
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Characteristics
Amphid shape (female) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) spiral cryptospiral
Amphid shape (male) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) spiral cryptospiral loop-shaped pore-like
Body length ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 200-250 µm 250-300 µm 300-350 µm 350-400 µm 400-450 µm 450-500 µm less than 200 µm
Cloacal tube ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) absent / indistinct present / obvious
Copulatory thorns at the level of ambulatory setae ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) absent 2-4 pairs arranged in continuous subventral rows 6-8 pairs arranged in continuous subventral rows 3+1 pairs arranged in continuous subventral rows, + one midventral unpaired 1+(3-5) pairs arranged in continuous subventral rows
Copulatory thorns at the level of spicules ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) absent two pairs in two distinct groups 2-5 pairs arranged in continuous subventral rows 10 pairs arranged in continuous subventral rows
Copulatory thorns in the cloalcal region (anal thorns) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) absent two subventral three subventral pairs
Number of body annules (counted along the subdorsal body sector) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 90-120 121-150
Number of subcephalic setae in female (pairs) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) six (three pairs) eight (four pairs)
Number of subcephalic setae in male (pairs) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) six (three pairs) eight (four pairs)
Ornamentation of annules ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) absent, cuticle smooth with vacuoles with striae or ridges, without spiny protruding end
Spicule length (along the median line / arc) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 20-30 µm 30-40 µm 40-50 µm 50-60 µm >60 µm
Spicule shape ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) arcuate semicircular
Subdorsal spines on tal ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) absent arranged in two longitudinal subdorsal rows arranged in multiple transverse rows in each subdorsal sector | Remaining taxa: Perepsilonema bahiae (Gerlach, 1957) Lorenzen, 1973
Perepsilonema benguelae Hendricks & Gibbons, 2010
Perepsilonema conifer Lorenzen, 1973
Perepsilonema coomansi Vanreusel & Vincx, 1986
Perepsilonema corsicum Vanreusel & Vincx, 1986
Perepsilonema crassum Lorenzen, 1973
Perepsilonema kellyae Gourbault & Decraemer, 1988
Perepsilonema longispiculosum Vanreusel & Vincx, 1986
Perepsilonema mediterraneum Vanreusel & Vincx, 1986
Perepsilonema moineaui Gourbault & Decraemer, 1992
Perepsilonema papulosum Lorenzen, 1973
Perepsilonema ritae Verschelde & Vincx, 1994
Perepsilonema trauci Lorenzen, 1973
Perepsilonema tubuligerum Gourbault & Decraemer, 1988
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