Chromadorita regabi

Chromadorita regabi	Contents	Rev: 03/01/2026
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Chromadorita Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Chromadoridae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Chromadorida
Chromadoridae (or Hypodontolaimidae)
Hypodontolaiminae
Chromadorita regabi Baldrighi, Vanreusel, Zeppilli, Sandulli & Segonzac. 2018

    Synonyms:

Morphology and Anatomy:

Body length may exceed 22mm
Cuticle homogeneous over total body length, with transverse rows of rod-like punctations. No lateral differentiations. No somatic setae.
Head tapering towards anterior end. Four 8 um long cephalic setae.
Small buccal cavity with one dorsal hollow tooth without strong paharyngeal musculature, and two smaller subventral teeth.
Pharynx with posterior bulbus.
Ventral gland reaching behind the pharynx, on the ventral side of the gut.

Females:

didelphic-amphidelphic; ovaries reflexed, anterior to the right of the intestine, posterior to the left of the intestine

Ref: Baldrighi et al., 2018

Males:

aMonorchic, testis on right side of intestine
Two spicules, 62 um long, strongly curved and cuticulariized. Simple needle-like apophysis.
Nine strong cup-shaped preanal papillae present, first one at 24 um from cloaca, others separated from each other by 9 to 12 um.

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

Described ring among the eggs of the ovigerous shrimp Alvinocaris muricola, ccollected in a cold-seep area in the Gulf of Guinea, the Regab site. In this area, rich chemosynthetic communities have been discovered at a depth of 3150 m in a large pockmark field (Olu et al. 2009). This active area, named Regab, is characterised by high methane concentrations supporting a massive bacterial production (Andersen et al. 2004). At this site, A. muricola has been observed to form high-density populations (Ramirez-Llodra & Segonzac 2006),

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Feeding:

Probably bacterial feeding

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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

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Ecosystem Functions and Services:

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Management:

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References:

Andersen AC, Hourdez S, Marie B, Jollivet D, Lallier FH, Sibuet M. 2004. Escarpia southwardae sp. nov., a new species of vestimentiferan tubworm (Annelida, Siboglinidae) from West African cold seeps. Canadian Journal of Zoology 82:980â€“999. DOI:10.1139/z04-049

Baldrighi, E., Vanreusel, A., Zeppilli, D., Sandulli, R. and Segonzac, M. 2018. Occurrence of Chromadorita regabi sp. nov. (Nematoda: Adenophorea), a nematode egg predator of Alvinocaris muricola (Crustacea: Decapoda: Caridea: Alvinocarididae) from a deep cold seep area of the Gulf of Guinea, The European Zoological Journal, 85:1, 299-311, DOI: 10.1080/24750263.2018.1498926

Olu K, Caprais JC, GalÃ©ron J, Causse R, Von Cosel R, Budzinski H, Le MÃ©nach K, Le Roux C, LevachÃ© D, Khripounoff A, Sibuet M. 2009. Influence of seep emission on the non-symbiont-bearing fauna and vagrant species at an active giant pockmark in the Gulf of Guinea (Congoâ€“Angola margin). Deep Sea Research Part II: Topical Studies in Oceanography 56:2380â€“2393. DOI:10.1016/j.dsr2.2009.04.017.

Ramirez-Llodra E, Segonzac M. 2006. Reproductive biology of Alvinocaris muricola (Decapoda: Caridea: Alvinocarididae) from cold seeps in the Congo Basin. Journal of Marine Biological Association of the United Kingdom 86:1347â€“1356. DOI:10.1017/S0025315406014378