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World Database of Nematodes Linked to the Marine Biology Section, UGent
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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
 Body length (mm) 
 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
a-ratio
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
b-ratio
<5
5-10
10-15
15-20
c-ratio
10-15
15-20
20-25
25-30
30-35
35-40
40-45
45-50
50-55
55-60
c'-ratio
<1
1.0-1.5
1.5-2.0
2.0-2.5
2.5-3.0
V-ratio (%)
<45%
50-55%
55-60%
60-65%
65-70%
70-75%
Cuticular spines
Present
Absent
Somatic setae shape
Setose
Leaf-shaped
Shape of inner labial sensilla
Articulated
Simple setose
Papilliform / conoid
Leaf-shaped
Shape of outer labial sensilla
Articulated
Simple setose
Papilliform / conoid
Length of outer labial sensilla (µm)
<5
5-10
10-15
15-20
20-25
35-40
Length of cephalic sensilla (µm)
<10
10-15
15-20
20-25
25-30
30-35
35-40
40-45
45-50
Subcephalic setae
Present
Absent
Amphid shape in male
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 male
4/5
3/4
2/3
1/2
2/5
1/3
1/4
Amphid shape in female
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 size relative to corresponding body width in female
1/3
1/4
1/5
<1/5
Length of spicules (µm)
<30
30-40
50-60
60-70
70-80
80-90
>100
Shape of supplements
Absent
Cup-shaped
Setose
Tubular
Number of supplements
<5
5-10
10-15
15-20
20-25
25-30
30-35
40-45
45-50
50-55
Absent
Shape of the tail
Conoid
Convex-conoid
Sigmoid-conoid
| 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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Page generated 2025-05-22 · contact: Tânia Nara Bezerra or info@marinespecies.org
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