Diplopeltoides suecicus

Diplopeltoides suecicus	Contents	Rev: 01/10/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Diplopeltoides Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Diplopeltoididae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Plectida: Leptolaimoidea; Diplopeltoididae

Diplopeltoides suecicus Holovachov & Bostrom, 2017

Synonyms:

Morphology and Anatomy:

Body cylindrical, posteriorly tapering in the tail region,
Cuticle coarsely annulated along entire body, except foranterior end and terminal part of the tail; annules; longitudinal striationvisible under SEM.
Labial region bluntly rounded, lips fused. Cuticularized plate underlying cephalic cuticle around amphid, cuticular plates on each side connected on ventral and on dorsal sides.
Inner labial sensilla not seen; outer labial sensilla small papilliform on anterior surface of lips. Cephalic sensilla setiform.
Amphids similar in shape and size between sexes: amphidial fovea an inverted U-shape with its dorsal branch longer than ventral branch.
Stoma very small, its cuticularized lining is uniform with the lining of the pharynx.
Pharynx subdivided into anterior corpus and posterior postcorpus; corpus cylindrical or slightly fusiform, muscular; postcorpus consists of anterior narrow non-muscular isthmus and pear-shaped glandular basal swelling.
Nerve ring surrounding isthmus. Secretory-excretory system with pore located ventrally in region of basal pharyngeal swelling;
Tail subcylindrical with bluntly rounded terminus. Somatic setae visible on tail.
Caudal glands opening via three separate openings, spinneret absent

Diplopeltoides suecicus. A. Anterior part of the female reproductive system. B. Female anterior end, surface view. C. Male anterior end, surface view. D. Female pharyngeal region, optical median section. E. Female tail. F. Male tail. Scale bar = 20 um
Drawings from Holovachov and Bostrom, 2017

Female:

Didelphic, amphidelphic, reflexed; ovary branches symmetrical.
Vulva pore-like, located near mid-body. Vagina straight, 0.2-0.3 vbd with sphincter muscle at its proximal part; pars refringens vaginae absent.
Sperm present in the uterus.
Rectum short, 0.7-0.9 abd long

Male:

Diorchic, testes outstretched.
Spicules paired and symmetrical, strongly curved, with weakly defined manubrium and subcylindrical shaft.
Gubernaculum plate-like, with a pair of strong closely set caudal apophyses.
Caudal setae present, arranged in subventral and subdorsal rows, but difficult to observe and count.

Ref: Holovachov and Bostrom, 2017

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

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Distribution:

Free-living marine nematode; describe from soft muddy sediments at 30 m depth in Gullmarn Fjord, Sweden.

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Feeding:

Probably epistrate feeders, Buccal cavity appears unarmed.

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Biology and Ecology :

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Life Cycle:

Ecophysiological Parameters:

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

Lorenzen, S. 1981. Entwurf eines phylogenetischen Systems der freilebenden Nematoden.(Outline of a phylogenetic system for the free-living nematodes).Veroffentlichungen des Instituts fur Meeresforschung in Bremerhaven 1981 No.Suppl. 7 pp.472 pp.