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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 Epsilonema Steiner, 1927
Key created by Oleksandr Holovachov
Please refer to this identification key as Holovachov, O. (2018) Identification key to species of the genus Epsilonema Steiner, 1927. 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
Number of body annules (counted along the subdorsal body sector)  <90 90-120 121-150 >150
Shape of body rings  non-overlapping neighboring rings overlapping neighboring rings
Ornamentation of annules  absent, cuticle smooth with vacuoles with striae or ridges, without spiny protruding end with striae or ridges, with spiny protruding end (serrated)
Long hair-like spines (longer than one annule width)  absent present, uniformly dispersed over parts of the body present, arranged in longitudinal rows along the dorsal side of the body present, arranged in longitudinal rows around the entire body
Short hair-like spines (equal to one annule width in lenght)  absent present
Ventral/subventral spines along middle flexure of the body  absent present
Body length  200-250 µm 250-300 µm 300-350 µm 350-400 µm 400-450 µm 450-500 µm more than 500 µm
Number of subcephalic setae  four (two pairs) six (three pairs) eight (four pairs) ten or more (five or more pairs)
Amphid shape (female)  spiral cryptospiral multispiral (three turns) with circular outline (round)
Amphid size in relation to corresponding body diameter (female)  <20% 20-30% 30-40% 40-50% 50-60% >60%
Amphid location on the cephalic capsule (female)  at the base of cephalic capsule in the middle of cephalic capsule
Amphid shape (male)  spiral cryptospiral multispiral (three turns) with circular outline (round) hook-shaped
Amphid size in relation to corresponding body diameter (male)  <20% 20-30% 30-40% 40-50% 50-60% >60%
Amphid location on the cephalic capsule (male)  at the base of cephalic capsule in the middle of cephalic capsule
Spines in the vulval region of the female  absent present
Pre-vulval flap  absent present
Spicule length (along the median line / arc)  20-30 µm 30-40 µm 40-50 µm 50-60 µm
Spicule shape  arcuate semicircular L-shaped
Shape of spicular capitulum  offset weak undeveloped
Copulatory thorns in the cloalcal region (anal thorns)  absent one midventral two subventral
Copulatory thorns at the level of spicules (capitulum), number  absent two three six (three pairs) 10-12 many, hard to count
Copulatory thorns at the level of spicules (capitulum), arrangement  N/A two rows small group large field single row
Copulatory thorns at the level of ambulatory setae, number  many, small many, large 3-5 pairs two three four five six seven eight nine ten absent
Copulatory thorns at the level of ambulatory setae, arrangement  N/A single row two rows small group large field | Remaining taxa: Epsilonema byssicola Lorenzen, 1973
Epsilonema costeriatum (Murphy, 1963)
Epsilonema cryptamphis Decraemer & Gourbault, 1987
Epsilonema cyrtum Steiner, 1931
Epsilonema dentatum Lorenzen, 1973
Epsilonema dentatum rugatum Lorenzen, 1973
Epsilonema docidocricum (Steiner, 1931) Lorenzen, 1973
Epsilonema enigmaticum Gourbault & Decraemer, 1994
Epsilonema espeeli Verschelde & Vincx, 1994
Epsilonema exoticum Gourbault & Decraemer, 1994
Epsilonema fernandinense Clasing, 1984
Epsilonema lasium Lorenzen, 1973
Epsilonema longispicula Decraemer, 1982
Epsilonema mangrovense Clasing, 1984
Epsilonema margaritatum Decraemer & Gourbault, 1987
Epsilonema meunierorum Decraemer & Gourbault, 1987
Epsilonema multispiralum Raes, Vanreusel & Decraemer, 2003
Epsilonema oodamphis Decraemer & Gourbault, 1987
Epsilonema paralasium Decraemer & Gourbault, 1987
Epsilonema parvospina Decraemer, 1982
Epsilonema pustulatum (Gerlach, 1952)
Epsilonema serrulatum Lorenzen, 1973
Epsilonema spinulosum Lorenzen, 1992
Epsilonema steineri Chitwood, 1935
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