Thelastoma
Leidy, 1849
Type species of the genus: Thelastoma attenuatum Leidy, 1849
- Cuticle with annulations along the body, more pronounced in female.
- Second annule from cephalic extremity enlarged.
- Esophageal corpus cylindrical. Narrow isthmus expanding into a
pyriform bulb. .
Note: Species of Thelastoma are usually distinguished on the morphology
of the adult females. The 2 main characters used in distinguishing
speciesare the position of the excretory pore relative to the esophageal
bulb and the length of the tail.
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Females:
- Vulva at anterior half of body near midbody.
- Didelphic-amphidelphic. Eggs oval.
- Tail long, filiform
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Males:
- Genital cone prominent,
- Single spicule
- Preanal and postanal papillae present; one pair on
caudal appendage.
- Filiform tail.
Ref: Carreno, 2007
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A genus of intestinal parasites of cockroaches; Females, males, and
juveniles found in hind gut of cockroaches.
Of the Thelastoma species that have been described in
North America, Thelastoma attenuatum; T. collare; T.
labiatum, T. krausi and T. spicatum have been reported
from diplopods (miilipedes).
Carreno, R.A. 2007. Description of a New
Species of Thelastoma Leidy, 1849 (Nematoda: Oxyurida: Thelastomatidae) from
the Millipede Euryurus leachii (Gray, 1832) in Ohio, U.S.A.Comparative
Parasitology 74:211-217.
Kumar, Y., Panwar, A., Anjum, A., Sharma, R.
2010. On two known nematode parasites of Periplaneta americana, L. J. Exp.
Zool. India. 13: 259-264.