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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 Draconematidae
This identification key for the genera of the family Draconematidae 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 Maaike Steyaert
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
 body shape 
 cylindrical, almost cylindrical: 1<mbd/(mbd)<1.1
slightly enlarged at level of pharynx: 1.1<mbd/(mbd)<2
pronounced enlargements at level of pharynx: mbd/(mbd)>=2
buccal cavity
narrow, unarmed
weakly developed with a small dorsal tooth
moderately to well developed with a dorsal and two subventral teeth
cuticle pattern
normal, thin
markedly thickened
helmet
absent, cuticle not thickened
present, cuticle more or less thickened, sclerotized
lumen wall of endbulb
not thickened
moderately thickened
strongly thickened
number of annules on tail
> 10
=<10
number of CAT
(4-6-)8-12
> 13
ornamentation of cuticle
smooth
presence of small spines
higher size of the first (7-14) body annules
lateral alae present
PAT
modified (= without differentiated tip)
typical (= with bell-shaped tip)
pharynx shape
more or less cylindrical, posteriorly slightly swollen
pharynx predominantly cylindrical, with endbulb well-developed
pharynx with mid-corpus swelling and endbulb well-developed
dumbbell-shaped, with swollen corpus and swollen endbulb
position of CAT
posterior to helmet, extending up to more than 2 head diameters along cervical region
within one head diameter posterior to helmet
on helmet
shape of CAT
modified
typical (= with enlarged base)
shape of fovea amphidialis
spiral, loop-shaped
reduced inverted U-shape (tubular)
| Remaining taxa:
Apenodraconema Allen & Noffsinger, 1978
Bathychaetosoma Decraemer, Gourbault & Backeljau, 1997
Cephalochaetosoma Kito, 1983
Cygnonema Allen & Noffsinger, 1978
Dinetia Decraemer & Gourbault, 1997
Dracogalerus Allen & Noffsinger, 1978
Dracognomus Allen & Noffsinger, 1978
Dracograllus Allen & Noffsinger, 1978
Draconactus Allen & Noffsinger, 1978
Draconema Cobb, 1913
Notochaetosoma Irwin-Smith, 1918
Paradraconema Allen & Noffsinger, 1978
Prochaetosoma Micoletzky, 1922
Tenuidraconema Decraemer, 1989
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Web interface and database structure initially created by Tim Deprez; now hosted and maintained by VLIZ
Page generated 2024-04-19 · contact: Tânia Nara Bezerra or info@marinespecies.org
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