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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 Desmodoridae
This key was originally created by Maarten Raes. The fine-tuning was done by the current key responsable Dominick Verschelde.
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
 amphid 
 anteriorly on non-annulated anterior end
posteriorly, near base of non-annulated anterior end
centrally on non-annulated anterior end
on lip region, i.e. on top of non-annulated anterior end
surrounded by anterior body annules
covering entire non-annulated anterior end
partly surrounded by anterior body annules
absent
buccal cavity
armed with small teeth
unarmed
armed with plates
armed with at least one large tooth
armed with exceptionally large tooth
cuticular ornamentation
normal: fine rings without special features
broad annules
long + short setae alternating
numerous stout, robust setae
regularly ordered longitudinal rows of ridges or spines
Cyanobacteria on cuticle
absent
present
labial region clearly separated from cephalic region s.s. by sutura
yes
no
location of cephalic setae
Anteriorly on head capsule (non-annulated anterior end), anterior to amphids
Anteriorly on head capsule (non-annulated anterior end), at level of (at least a part of) the amphids
Anteriorly on head capsule (non-annulated anterior end), posterior to amphids
Centrally on head capsule (non-annulated anterior end), anterior to amphids
At base of head capsule (non-annulated anterior end), anterior to amphids
At base of head capsule (non-annulated anterior end), at level of (at least a part of) the amphids
At base of head capsule (non-annulated anterior end), posterior to amphids
no head capsule, anterior to amphids
no head capsule, at level of (at least a part of) the amphids
Anteriorly on head capsule, no amphids
posterior to head capsule (non-annulated anterior end), at level of (at least a part of) the amphids
posterior to head capsule (non-annulated anterior end), posterior to amphids
posterior to head capsule (non-annulated anterior end), anterior to amphids
Centrally on head capsule (non-annulated anterior end), at level of (at least a part of) the amphids
Centrally on head capsule (non-annulated anterior end), posterior to amphids
no head capsule, posterior to amphids
non-annulated anterior end
a heavily cuticularised head capsule: dome shaped
a heavily cuticularised head capsule: consisting of several plates
a heavily cuticularised head capsule: globular
a heavily cuticularised head capsule: elongated dome
a heavily cuticularised head capsule: triangular dome
globular, weakly cuticularised
short, weakly cuticularised
rounded, weakly cuticularised
absent: body completely annulated
rectangular, weakly cuticularised
precloacal supplements (males)
tubular
papilliform
pyramidal
s-shaped
spine(s) or thorn(s)
setiform
glands
absent
longitudinal ventral protrusion
shape of buccal cavity
tiny, inconspicuous
very wide, more or less rectangular
intermediate
small
shape of fovea amphidialis
multispiral: 1.25-2 turns
multispiral: more than 2 turns
unispiral, not circular
antero-posteriorly flattened unispiral
elongated spiral
rectangular
circle or unispiral with circular outline
on plaque
U-shape or inverted loop
C-shape
ellips
2 concentric circles
tube-shaped
inverted U-shape or loop-shaped
no amphids
shape of posterior oesophageal bulb
absent or no obvious widening of the pharynx
gradually widening, pyriform
well-developed, round or oval
well-developed, clearly elongated, consisting of several (2-...) parts
anterior bulb present
mid-pharyngeal bulb present
| Remaining taxa:
Acanthopharyngoides Chitwood, 1936
Acanthopharynx Marion, 1870
Alaimonema Cobb, 1920
Amphispira Cobb, 1920
Aponema Jensen, 1978
Bolbonema Cobb, 1920
Chromaspirina Filipjev, 1918
Croconema Cobb, 1920
Desmodora de Man, 1889
Desmodorella Cobb, 1933
Echinodesmodora Blome, 1982
Eubostrichus Greeff, 1869
Laxonema Cobb, 1920
Laxus Cobb, 1894
Leptonemella Cobb, 1920
Metachromadora Filipjev, 1918
Metadesmodora Schuurmans Stekhoven, 1942
Molgolaimus Ditlevsen, 1921
Onyx Cobb, 1891
Papillonema Verschelde, Muthumbi & Vincx, 1995
Paradesmodora Schuurmans Stekhoven, 1950
Parallelocoilas Boucher, 1975
Parathalassoalaimus Allgén, 1929
Polysigma Cobb, 1920
Prodesmodora Micoletzky, 1923
Psammonema Verschelde & Vincx, 1995
Pseudochromadora Daday, 1899
Pseudodesmodora Boucher, 1975
Pseudometachromadora Timm, 1954
Pseudonchus Cobb, 1920
Robbea Gerlach, 1956
Sigmophoranema Hope & Murphy, 1972
Spirinia Gerlach, 1963
Squanema Gerlach, 1963
Stilbonema Cobb, 1920
Stygodesmodora Blome, 1982
Xenodesmodora Wieser, 1951
Xenonema Cobb, 1920
Zalonema Cobb, 1920
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