Chromadorina tangaroa

Chromadorina tangaroa	Contents	Rev: 03/08/2026
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Chromadorina Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Chromadoridae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Chromadorida
Chromadoridae: Chromadorinae
Chromadorina tangaroa Leduc, 2020

    Synonyms:

Morphology and Anatomy:

Body cylindrical, tapering slightly towards anterior extremity.
Homogeneously punctated cuticle, with transverse striations approximately 1 um apart and interspersed with transverse rows of punctations; lateral differentiation absent.
Short somatic setae, 3 um long, sparsely distributed throughout body.
Cephalic region blunt, slightly rounded, with relatively well-developed lip region. Inner and outer labial sensilla inconspicuous. Four cephalic setae, 0.3â€“0.5 cbd long. One or two pairs of sublateral cervical setae present on each side of body
Amphideal fovea spiral, with 1.5 turns and transversely oval outline, at level of cephalic setae,
Buccal cavity with funnel-shaped pharyngostome; one solid dorsal tooth and two solid, slightly smaller ventrosublateral teeth.
Pharynx muscular, not swollen anteriorly, lumen not cuticularized or only slightly cuticularized; conspicuous oval-shape posterior bulb with plasmatic interruptions; cardia small, surrounded by intestine.
Secretory-excretory system with elongated renette cell, located well posterior to pharynx but with poe near level of teeth
Tail conical, curved ventrally, with few sparsely distributed sublateral setae, three large caudal glands and well-developed spinneret

.Chromadorina tangaroa (A) Female anterior; (B) and (C) Male cephalic region; (D) Female cephalic region; (E) Female posterior body region; (F) Male posterior body region.

Scale bar: 35 um (A), 16 um (Bâ€“D), 30 um (E) and 25 um (F)

Drawings from Leduc (2020)

Females:

Didelphic, amphidelphic. gonads antidromously reflexed; anterior on left of intestine, posterior on right
Vulva slightly anterior to mid-body
Prevulvar pad of slightly thicker cuticle with coarse striations located immeediately anterior to vulva

Ref: Leduc, 2020

Males:

Monorchic, testis outstretched
Spicules paired, equal, slightly ventrally curved, capitulum rounded, narrow shaft and blade gradually tapering distally
Gubernaculum slightly ventrally curved, about as long as spicules,
Three small, cup-shaped precloacal supplements present, 8-13 um apart.

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

Distribution:

Free-living marine nematodes. Chromadorina tangaroa was described from filamentous seaweed growing on the hull of a ship (RV Tangaro)a anchored in Wellington, New Zealand.

Feeding:

Probably epistrate feeders with scraping tooth in stoma (Heip et al., 1998; Tchesunov, 2015)

Chromadorina spp are globally distributed, and frequently found associated with accumulations of organisms, including macro- and microalgae and crustaceans, as well as artificial substrates such as settlement plates and ship hulls. Such associations may contribute to the global dispersal of the genus (Leduc, 2020).

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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