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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
buccal cavity shape  subdivided (pharyngostom) in two parts non-divided, V-shaped
apex of lips  partially fused (three lips) not fused fused
spicules  arcuate and robust long none of the above
tail shape  long and filiform with swollen tip conoid none of the above
spinneret shape  with a hyaline plug-like structure long
pharyngeal lumen sclerotized  present absent
well developed postcloacal genital papillae  present absent
protrusion of the labial cuticle surrounding the inner labial sensilla  present absent
well sclerotized cheilostome (except in Monhystrella), weakly or nonsclerotized second chamber  present absent
vagina sclerotized  present absent
copulatory bursa  present absent
ocelli  present absent
ventral gland well developed  present absent
small oral aperture, posterior buccal cavity part tube-like  present absent
pharynx with posterior bulbus  present absent
ovary reflexed  present absent
vulva close to the anus (V% = 75)  present absent
somatic setae (length < 30% of the cbd)  present absent
rectum well developed  present absent
ventral gland opening at anterior neck region  present absent
inner labial sensillae papilliform  present absent
peri-oral plates  present absent
cristalloid bodies  present absent
cheilostome weakly sclerotized and small  present absent
strong sexual dimorphism in shape of amphidial fovea and buccal cavity  present absent
two lateral setae posterior to the amphidial fovea  present absent
buccal cavity armature  18 - with three teeth 37 - denticulate 16 - with small denticle at base of buccal cavity
well developed second chamber of buccal cavity  present absent
gubernaculum without apophyse  present absent
gubernaculum slipper shaped  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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Page generated 2025-04-29 · contact: Tânia Nara Bezerra or info@marinespecies.org
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