Spinitectus thaiensis

Spinitectus thaiensis	Contents	Rev 02/20/2024
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Spinitectus Menu	Economic Importance	Damage
	Distribution	Management
Return to Cystidicolidae Menu	Feeding	References
	Go to Nemaplex HomePage	Go to Dictionary of Terminol;ogy

Classification:

Chromadorea
Chromadoria
Rhabditida: Spirurina
Habronematoidea
Cystidicolidae

Spinitectus thaiensis Moravec & Yooyen, 2011

Morphology and Anatomy:

Smallish nematodes, 8-12 mm long, rounded anteriorly and pointed posteriorly.
Body surface of body with transverse rings of spines which are interrupted at sides of body by lateral lines.
Oral aperture oval, dorsoventrally elongated, surrounded by four low submedian labia, two subdorsal and two subventral, with broad base; a narrow sclerotized structure at inner surface of each labium.
Four elongate submedian cephalic papillae; small amphids at outer margins of pseudolabia.
Buccal capsule very short, thin-walled, with anterior part distended into a small funnel-shaped prostom in lateral view.
Eesophagus with anterior muscular region and much longer and somewhat wider posterior glandular portion.
Nerve ring encircles muscular part of eesophagus.
Excretory pore situated at level of fourth ring of spines.
Tails of both sexes conical.

	Female: Didelphic, amphidelphic. Vulva not elevated, postequatorial, Vagina muscular, directed anteriorly from vulva.
Anterior of Spinitectus thaiensis showing rows of spines on the cuticle. From Moravec and Yooyen, 2011	Male: Monorchic, testis extending anteriorly to posterior part of glandular eesophagus. Four pairs of subventral, pedunculate precloacal papillae, spaced almost equally; 5 pairs of subventral, pedunculate postcloacal papillae, and 1 pair of ventral sessile papillae. Small phasmids just anterior to ventral postcloacal papillaeLeft spicule larger and longer than right. Ref: Moravec and Yooyen (2011). Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Anterior of Spinitectus thaiensis showing esophagus, nerve ring and rows of spines on the cuticle. From Moravec and Yooyen, 2011

Distribution:

Spinitectus thaiensis was recovered from the intestine of freshwater fish (Asian bumblebee catfish Pseudomystus siamensis in northern Thailand (Moravec and Yooyen, 2011).

Feeding:

Intestinal parasites of freshwater fish.

Life Cycle:

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

Ecosystem Functions and Services:

Moravec, F. , Yooyen, T. 2011. Observations on two nematode species parasitizing freshwater fishes in Thailand, including Spinitectus thaiensis sp. nov. (Cystidicolidae) from Pseudomystus siamensis (Bagridae). Acta Parasitologica 56:58-66; DOI: 10.2478/s11686-011-0014-1.