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World Database of Nematodes Linked to the Marine Biology Section, UGent
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Key to the genera of the family Epsilonematidae
This identification key for the genera of the family Epsilonematidae should serve as a help in the difficult process of identifying members of this family. The key is based upon literature sources and the experience of several Nematologists from the Marine biology Section Ugent. Note that the key is an evolving tool.
Using the key still requires a basic skill in the field of nematology. Results should always be checked with the species-descriptions and illustrations available in the database.
Key created by Oleksandr Holovachov
Please refer to this identification key as Steyaert, M.; Deprez, T.; Raes, M.; Bezerra, T.; Demesel, I.; Derycke, S.; Desmet, G.; Fonceca, G.; de Assunção Franco, M.; Gheskiere, T.; Hoste, E.; Ingels, J.; Moens, T.; Vanaverbeke, J.; Van Gaever, S.; Vanhove, S.; Vanreusel, A.; Verschelde, D.; Vincx M. 2005. Electronic Key to the free-living marine Nematodes.
World Wide Web electronic publication.
www.nemys.ugent.be. 09/2005
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| Characteristics
 ambulatory setae 
 present, arranged on ventral side of posterior body region
absent
present, with an asymmetrical arrangement
amphidial fovea in female
spiral
pore-like
amphidial fovea in male
spiral: open spiral, spiral with circular outline, elongated spiral or loop shape
loop-shaped with a flap
pore-like
arrangement of ambulatory setae relative to vulva
most setae posterior to vulva
most setae anterior to vulva
all setae well anterior to vulva
all setae posterior to vulva or at level of vulva
body shape
cylindrical, almost cylindrical
enlarged at level of pharynx
dorsal cuticular protrusions (horns) in pharyngeal region
present
absent
habitus
ventrally curved
markedly elongated anterior region (from pharynx base up to ventral curvature)
clearly epsilon-shaped (sigmoid when posterior region less plicated)
clearly epsilon-shaped, posteriorly folded up
head capsule shape
globular
a truncated cone
number of caudal gland outlets, as visible under light microscope
one
three, each outlet on a smooth papilla
number of rows of ambulatory setae
< 6
> 6 or = 6
number of subcephalic setae
=< 2
2 < # scs =< 8
8 < # scs
ovaries
antidromously reflexed
outstretched
position of subcephalic setae
at level of the amphids, i.e. at base of the head capsule
anterior to amphids, about halfway head length
shape of ambulatory setae
ambulatory setae slender, s-shaped or relatively straight
relatively straight ambulatory setae + additional short, strongly built, tubular, dorsosublateral ambulatory setae
very strong, distally differentiated, glandular setae
tail ornamentation with small, subdorsal spines
present
absent
| Remaining taxa:
Akanthepsilonema Gourbault & Decraemer, 1991
Archepsilonema Steiner, 1927
Bathyepsilonema Steiner, 1927
Epsilonema Steiner, 1927
Glochinema Lorenzen, 1974
Keratonema Gourbault & Decraemer, 1986
Leptepsilonema Clasing, 1983
Metaglochinema Gourbault & Decraemer, 1986
Metepsilonema Steiner, 1927
Perepsilonema Lorenzen, 1973
Polkepsilonema Verschelde & Vincx, 1993
Pternepsilonema Verschelde & Vincx, 1993
Triepsilonema Decraemer, 1982
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Web interface and database structure initially created by Tim Deprez; now hosted and maintained by VLIZ
Page generated 2024-10-10 · contact: Tânia Nara Bezerra or info@marinespecies.org
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