Synonchium caudatubatum

Synonchium caudatubatum	Contents	Rev: 08/20/2026
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
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Classification:

Chromadorea
Chromadoria
Chromadorida
Selachinematidae: Selachinematinae
Synonchium caudatubatum Shi & Xu, 2017

Synonyms:

Morphology and Anatomy:

Synonchium caudatubatum is characterized by:

Body 2.3â€“2.6 mm long. Cuticle thick and annulated with transverse row of punctations and lateral pores, without lateral differentiation.
Labial region with 12 lobes and 6 pairs of membrane-like cuticle extensions. Six inner labial papillae minute. Six outer labial papillae and four cephalic papillae large and conical.
Amphideal fovea multispiral with three turns, oval-shaped.
Buccal cavity in two parts: anterior with 12 cuticularized rhabdia; posterior surrounded by pharyngeal tissue, with 3 mandibles each bearing large teeth flanked by three smaller teeth on both sides.
Pharynx cylindrical, anterior swollen. Nerve ring surrounding pharynx near mid-length; cardia flattened.
Intestine cells large, filled with numerous small granules.
Tail bluntly rounded, with a protuberant caudal duct. Three caudal glands with distinct spinneret.

	Females: Didelphic-amphidelphic, ovaries reflexed Vulva a transverse slit, in posterior half of body length (about 60% of body length). Ref: Huang and Guo, 2022
Synonchium caudatubatum. (a, b) Head of male; (c) pharyngeal region of male; (d) tail of male. (Scale bars: 50 um). (Drawings from Shi and Xu 2018 via Huang and Guo, 2022)
Males: Diorchic, testes short and broad. Spicules almost straight, with proximal end weakly cephalated, distal end pointed and slightly bent ventrally. Gubernaculum and precloacal supplements absent.
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Distribution:

Marine nematodes. Reported from intertidal silt sediment in East China Sea

Feeding:

Predatory:on nematodes and micro-invertebrates

Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

Huang, Y. and Guo, Y. 2022. Free-living Marine Nematodes from the East China Sea. Springer, Singapore and Science Press, Beijing.

Shi, B.Z., and K.D. Xu. 2018. Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae). European Journal of Taxonomy 405: 1-17.