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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
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 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 female  1/3 1/4 1/5 <1/5
Amphid size relative to corresponding body width in male  4/5 3/4 2/3 1/2 2/5 1/3 1/4
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
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
b-ratio  <5 5-10 10-15 15-20
c'-ratio  <1 1.0-1.5 1.5-2.0 2.0-2.5 2.5-3.0
c-ratio  10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60
Cuticular spines  Present Absent
Length of cephalic sensilla (µm)  <10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50
Length of outer labial sensilla (µm)  <5 5-10 10-15 15-20 20-25 35-40
Length of spicules (µm)  <30 30-40 50-60 60-70 70-80 80-90 >100
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 inner labial sensilla  Articulated Simple setose Papilliform / conoid Leaf-shaped
Shape of outer labial sensilla  Articulated Simple setose Papilliform / conoid
Shape of supplements  Absent Cup-shaped Setose Tubular
Shape of the tail  Conoid Convex-conoid Sigmoid-conoid
Somatic setae shape  Setose Leaf-shaped
Subcephalic setae  Present Absent
V-ratio (%)  <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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Page generated 2023-05-29 · contact: Tânia Nara Bezerra or info@marinespecies.org
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