Amphimonhystrella bullacauda

Amphimonhystrella bullacauda	Contents	Rev: 01/03/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Amphimonhystrella Menu	Economic Importance	Ecosystem Functions and Services
	Distribution	Management
Return to Xyalidae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Monhysterida: Monhysterina
Sphaerolaimoidea
Xyalidae
Amphimonhystrella bullacauda Tchesunov & Miljutina, 2005

Synonyms:

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Morphology and Anatomy:

Body slender, elongate spindle-shaped.
Cuticle distinctly annulated with approximately.
Cephalic end slightly narrowed, in shape of a truncated cone. Cephalic cuticle smooth from the apex to the stoma ending.
Labial papillae minute, obscure. Outer labial and cephalic setae united in a single circle. Outer labial setae two-jointed and longer than smooth cephalic setae.
Amphid relatively large, round or slightly longitudinally oval, with discontinuous fine but distinct edging.
No somatic setae visible along the body.
Buccal cavity from elongate-conical to nearly cylindroid, with thin sclerotised walls, surrounded by an esophageal ccollar.
Esophagus slender with weak radial muscular striation, slightly widened at the posterior end.
Cardia cordate, surrounded with the intestinal tissue.
Tail consists with proximal conical portion differentiated by a deep narrowing from terminal portion ;strongly enlarged ito clavate terminus.
Two or three very short terminal setae No other setae on the tail. There are two caudal glands barely visible inside the tail with seperate ducts opening at the terminal widening.

The species name recognizes the enlargement of the tail tip.

	Amphimonhystrella bullacauda. B: Female entire body. C: Male anterior body; D: Male posterior body; Bars: B=100 um, C,D: 20um. From Tchesunove and Miljutina, 2005	Females: Monodelphic, prodelphic.gonad outstretched. Uterus continues into a postvulvar sac narrowing to the blind posterior end. Spherical spermatozoa with minute central nuclei present in the postvulvar sac
Source: Tchesunov & Miljutina, 2005
Males: Monorchic, testis outstretched and situated to the left of the midgut. Spermatocytes in the testis large, in a single No supplements. Spicules very short, slightly arched, distally acute and proximally slightly cephalated. Gubernaculum with a short dorso-caudal apophysis.
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.