- A family of predatory marine nematodes that commonly inhabit littoral
and shallow sub-littoral habitats.
- Buccal cavity conical with one dorsal and two sub-ventral lips and armed
with powerful jaws.
- Jaws formed by three mandibular plates, each with a forwardly directed
- Pharyngeal muscles are attached anteriorly to the cephalic cuticle to
form a cephqlic capsule.
- Labial sensilla are setiform.
- Smooth cuticle,
- Metanemes, (filamentous organs located in or near
lateral hypodermal chord, characteristic of Enoplida)
- Non-spiral amphideal fovea.
from Nicholas (2007)
Additional diagnostic description by Vailas-Boas et al., 2015:
- Three prominent lips.
- Setiform inner labial setae (papilliform only in Fenestrolaimus);
outer labial and cephalic setae robust and long.
- Cephalic organs are usually present, situated frontally or
ventro-frontally in relation to the lateral cephalic setae.
- Non-spiral, small amphidial fovea located posterior to the cephalic
- The inner layer of the cuticle forms a cephalic capsule to which the
pharyngeal muscles are attached.
- Buccal cavity, conical, tapered, with three jaws and three conical teeth
associated with the base of the jaws (one
dorsal and two
ventrosublateral) or a long eversible spear in subfamily
- Only dorsolateral orthometanemes with a robust scapulus but
without caudal filament.
- Female reproductive system is didelphic-amphidelphic, with antidromously
- Caudal glands located in the pre-caudal region.
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Andrassy, I. 2009. Free-living Nematodes of Hungary
(Nematoda Errantia) Vol. 111. Humgarian Natural History Museum, Budapest.
Lorenzen, S. 1994. The phylogenetic sistematics of freeliving nematodes.
London, The Ray Society, 383p.
Nicholas, W.L. 2007. A new species of Trileptium (Nematoda,
Thoracostomopsidae) from a sandy beach in southeastern Australia, with a key to
species and observations on geographical distribution. New Zealand Journal
of Marine and Freshwater Research 41: 335-344.
Vilas-Boas, A.C., da Silva, M.C., de Souza Alves, O.F., de Castro, F.J.V.,
Pinheiro-Junior, E.P. 2015. A new species of Trileptium (Nematoda:
Thoracostomopsidae) from Bahia, Brazil. Zoologia 33(1): e20150043 | DOI:
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