Drawing from University of Nebraska
Four cephalic setae.
Oval or uni-spiral amphids.
Stoma elongate, tubular or funnel-shaped, no teeth.
Cuticle striated, sometimes with longitudinal ridges
Esophagus with terminal bulb that has an elongate,
multi-chamber valve and long extension so that the bulb may appear to be
median rather than terminal.
Females monovarial, prodelphic.
Male with supplements
No spinneret or caudal glands in tail.
The family name literally translates as
clock-stomach. Andrássy (2005) speculates that Cobb provided
the name to the genus Chronogaster because the elongate valve in
the terminal bulb resembles the hands of a clock. Alternatively, the
esophagus with terminal bulb and its elongate extension might be considered
to resemble the pendulum of a clock.
Primarily freshwater nematodes; also in thermal springs, mosit soils, algal
and fungal mats (Abebe et al., 2013)..
Species of the genus are reported to have great physiological plasticity
and tolerance to high level of oxygen fluctuation; besides freshwater, they
occupy salty habitats including caves (Abebe et al., 2006; Abebe et al.,
2013; Hodda et al., 2006).
Abebe, E., Ferebee, B., Taylor, T., Mundo-Ocampo, M., Mekete, T., De Ley, P.
2013. Neotobrilus nicsmolae n. sp. (Tobrilidae: Nematoda) and Chronogaster
carolinensis n. sp. (Chronogasteridae: Nematoda) from Lake Phelps, North
Carolina. J. Nematology 45: 66-77.
Abebe E., Traunspurger W., Andraï¿½ssy I., eds. 2006. Freshwater
nematodes: ecology and taxonomy. Wallingford, UK; CAB International.
Andrássy, I. 2005. Free-living Nematodes of Hungary Vol 1.
Hungarian Natural History Museum, Budapest.
Hodda, M., Ocana, A., and Traunspurger, W. 2006. Nematodes from extreme
freshwater habitats. Pp. 179ï¿½210 in E. Abebe, W. Traunspurger, and I.
Andraï¿½ssy, ed. Freshwater nematodes: Ecology and taxonomy. Wallingford, UK: