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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 Monhysteridae
Polytomous key to the genera of the family Monhysteridae based on the publication of Fonseca and Decramer (2008) Key created by Katja Guilini
Please refer to this identification key as Fonseca G., Decraemer W. (2008) State of the art of the free-living marine Monhysteridae (Nematoda). Journal of the Marine Biological Association of the United Kingdom, 2008, 88(7), 1371–1390
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| Characteristics
apex of lips ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) partially fused (three lips) not fused fused
buccal cavity armature ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) 18 - with three teeth 37 - denticulate 16 - with small denticle at base of buccal cavity
buccal cavity shape ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) subdivided (pharyngostom) in two parts non-divided, V-shaped
cheilostome weakly sclerotized and small ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
copulatory bursa ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
cristalloid bodies ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
gubernaculum slipper shaped ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
gubernaculum without apophyse ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
inner labial sensillae papilliform ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
ocelli ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
ovary reflexed ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
peri-oral plates ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
pharyngeal lumen sclerotized ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
pharynx with posterior bulbus ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
protrusion of the labial cuticle surrounding the inner labial sensilla ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
rectum well developed ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
small oral aperture, posterior buccal cavity part tube-like ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
somatic setae (length < 30% of the cbd) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
spicules ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) arcuate and robust long none of the above
spinneret shape ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) with a hyaline plug-like structure long
strong sexual dimorphism in shape of amphidial fovea and buccal cavity ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
tail shape ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) long and filiform with swollen tip conoid none of the above
two lateral setae posterior to the amphidial fovea ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
vagina sclerotized ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
ventral gland opening at anterior neck region ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
ventral gland well developed ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
vulva close to the anus (V% = 75) ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
well developed postcloacal genital papillae ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
well developed second chamber of buccal cavity ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent
well sclerotized cheilostome (except in Monhystrella), weakly or nonsclerotized second chamber ![Pictorial key](https://www.marinespecies.org/aphia/images/idkeys/camera1.gif) present absent | Remaining taxa: Anguimonhystera Andrássy, 1981
Cryonema Tchesunov & Riemann, 1995
Diplolaimella Allgén, 1929
Diplolaimelloides Meyl, 1954
Eumonhystera Andrássy, 1981
Gammarinema Kinne & Gerlach, 1953
Geomonhystera Andrássy, 1981
Halomonhystera Andrássy, 2006
Hieminema Tchesunov & Portnova, 2005
Monhystera Bastian, 1865
Monhystrella Cobb, 1918
Odontobius Roussel del Vauzème, 1834
Sinanema Andrássy, 1960
Thalassomonhystera Jacobs, 1987
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