Thalassomonhystera oxycephalata

Thalassomonhystera oxycephalata	Contents	Rev: 02/22/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Thalassomonhystera Menu	Economic Importance	Ecosystem Functions and Services
	Distribution	Management
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Classification:

Chromadorea
Chromadoria
Monhysterida: Monhysterina
Monhysteroidea
Monhysteridae
Thalassomonhystera oxycephalata Tchesunov & Miljutina, 2005

Synonyms:

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Morphology and Anatomy:

Labial region slightly offset. Mouth opening surrounded with six small lips; labial papillae not discernible. T
Outer labial setae and cephalic setae jointed; in a single circle of ten tiny setae approximately .
Amphid large, circular to slightly longitudinally oval, with fine but distinct cuticular edging,. located well posterior to the stoma ending.
No other sensilla along body posterior to the amphid.
Buccal cavity elongate tubular, very narrow, ihardle different from the size of the esophagus lumen.
Esophagus slender and weak. Cardia small, surrounded with intestinal tissue.
Tail distinctly consists of two parts about equel length, proximal conical and distal slender flagelliform.
Tail tip slightly swollen, with minute spinneret.
Two caudal gland cell bodies visible within the proximal tail portion in some specimens.

	Females: Monodelphic, prodelphic, gobad outstretched and situated entirely to the right of the midgut. Vulva at about 65% of body length No postvulvar sac.
Thalassomonhystera ocycephalata male A= entire body; B= anterior body; C= posterior body Bars A= 100 um; B,C =10 um From Tchesunov and Miljutina, 2005
Males: Monorchic, testis outstretched and situated entirely to the right of the midgut. Spermatocytes relatively large and arranged in one row in the anterior part of the gonad. Spicules short, arcuate, distally pointed and proximally ending with slightly differentiated knobs. Gubernaculum with a dorso-caudal apophysis. No supplements. RefL Tchesunov amd Miljutina, 2005
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

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Distribution:

Deep sea nematodes. Described from samples of silt at 5569 meters depth in the Molloy Deep of the Arctic Ocean between Greenland and the Svalbard archipelgo.