Identification key to species of the genus Gammanema Cobb, 1920 Key created by Oleksandr Holovachov
Please refer to this identification key as Holovachov, O. (2019) Identification key to species of the Gammanema Cobb, 1920. 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. (2019) NeMys: World Database of Free-Living Marine Nematodes. Accessed at http://nemys.ugent.be
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Characteristics
Amphid shape in female ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Spiral, <1.5 turns Spiral, 1.5-2 turns Spiral, 2-2-5 turns Spiral, 2.5-3 turns Spiral, 3-3.5 turns Spiral, 4-4.5 turns
Amphid shape in male ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Loop-shaped Spiral, <1.5 turns Spiral, 1.5-2 turns Spiral, 2-2.5 turns Spiral, 2.5-3 turns Spiral, 3-3.5 turns Spiral, 3.5-4 turns Spiral, 4-4.5 turns
Amphid size relative to corresponding body width in female ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 1/3 1/4 1/5 <1/5
Amphid size relative to corresponding body width in male ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 4/5 3/4 2/3 1/2 2/5 1/3 1/4
a-ratio ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60 60-65 65-70 70-75
Body length (mm) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 0.5-1.0 mm 1.0-1.5 mm 1.5-2.0 mm 2.0-2.5 mm 2.5-3.0 mm 3.0-3.5 mm 3.5-4.0 mm 4.0-4.5 mm 4.5-5.0 mm 5.0-5.5 mm 5.5-6.0 mm
b-ratio ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) <5 5-10 10-15 15-20
c'-ratio ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) <1 1.0-1.5 1.5-2.0 2.0-2.5 2.5-3.0
c-ratio ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60
Cuticular spines ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Present Absent
Length of cephalic sensilla (µm) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) <10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50
Length of outer labial sensilla (µm) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) <5 5-10 10-15 15-20 20-25 35-40
Length of spicules (µm) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) <30 30-40 50-60 60-70 70-80 80-90 >100
Number of supplements ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) <5 5-10 10-15 15-20 20-25 25-30 30-35 40-45 45-50 50-55 Absent
Shape of inner labial sensilla ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Articulated Simple setose Papilliform / conoid Leaf-shaped
Shape of outer labial sensilla ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Articulated Simple setose Papilliform / conoid
Shape of supplements ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Absent Cup-shaped Setose Tubular
Shape of the tail ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Conoid Convex-conoid Sigmoid-conoid
Somatic setae shape ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Setose Leaf-shaped
Subcephalic setae ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) Present Absent
V-ratio (%) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) <45% 50-55% 55-60% 60-65% 65-70% 70-75% | Remaining taxa: Gammanema agglutinans Leduc, 2013
Gammanema anthostoma Okhlopkov, 2002
Gammanema cancellatum Gerlach, 1955
Gammanema conicauda Gerlach, 1953
Gammanema curvata Gagarin & Klerman, 2007
Gammanema fennicum Gerlach, 1953
Gammanema kosswigi Gerlach, 1964
Gammanema magnum Shi & Xu, 2018
Gammanema mediterraneum Vitiello, 1970
Gammanema polydonta Murphy, 1965
Gammanema rapax (Ssaweljev, 1912) Gerlach, 1964
Gammanema smithi Murphy, 1964
Gammanema tchesunovi Gagarin & Klerman, 2007
Gammanema uniformis (Cobb, 1920) Tchesunov & Okhlopkov, 2006
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