Cervonema

Cervonema	Contents	Rev: 06/07/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Cervonema Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Comesomatidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Chromadorea
Chromadoria
Chromadorida: Comesomatoidea
Comesomatidae: Sabatieriinae

Cervonema Wieser, 1954

Type species of the genus?: Cervonema allometricum Wieser, 1954

Synonyms:

Morphology and Anatomy:

With characteristics of the subfamily Sabatieriinae (a weakly sclerotized buccal cavity with the posterior section as a collapsed tube; spicules enlarged proximally, gubernacular apophyses paired or single)
Striated cuticle; fine punctations may be also be present.
Anterior and posterior cephalic sensilla in distinctly separate crowns and usually equal in length.
Amphids usually set back from cephalic setae, about 2 bd from the anterior, spiral with up to 7 turns
Buccal cavity short and undifferentiated.
Cervical region elongate and narrowed, posterior esophageal bulb elongat.
Tail conico-cylindrical

Females:

Didelphic, amphidelphic

Body size range for the species of this genus in the database - Click:

Cervonema pseudodeltensis male: A, esophagus; B, head; C, pre-cloacal region; D, tail; E, gonads; F, habitus. Scale bars: 10 um (Aï¿½D), 20 um (E), and 100 um (F).
Drawings from Barnes et al., 2012

Males:

Spicules simple, poorly sclerotized and < 2 abd in length, usually ≤ 1 abd.
Gubernaculum plate-like, or not present, apophyses absent.
Diorchic
Supplements minute tubular pores or absent.

Ref Barnes et al., 2012

Distribution:

Inhabiting intertidal or subtidalzone and continental slope regions, particularly upper rgions of the continental slope.

.Like Laimella spp., species of Cervonema have been recorded from the intertidal and estuarine habitats to the deep sea; usually in fine sand and muddy sediments. They tend to be restricted to marine or near-marine salinities and have been observed to increase in abundance in disturbed sediments (Lee et al. 2001).

Cervonema spp. have been described from Africa, America, Asia and Europe, and have been recorded in, but not described from, the Arctic and Southern Oceans (Vanreusel et al. 2000; Lee et al. 2001).

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Feeding:

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Biology and Ecology:

Although usually in saline environments, (1998) reported that an upper-shore species of Cervonema was able to osmoregulate under osmotic stress conditions (immersion in hypo- or hyper-tonic solutions),reflecting at habitat-specific adaptation rather than a species or genus specific characteristic (Barnes et al., 2012)

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Life Cycle:

For Ecophysiological Parameters for this genus, click

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Ecosystem Functions and Services:

Predator.

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Management:

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References:

Barnes, N., Kim, H.G., Le, W. 2012. New species of free-living marine Sabatieriinae (Nematoda: Monhysterida: Comesomatidae) from around South Korea. Zootaxa 3368:263-290.

Lee, H.J., Gerdes, D., Vanhove, S. & Vincx, M. 2001. Meiofauna response to iceberg disturbance on the Antarctic continental shelf at Kapp Norvegia (Weddell Sea). Polar Biology, 24::926-933.

Tsechunov, A.V. 2000. Several new and known species from the families Coninckiidae and Comesomatidae (Nematoda) in the White Sea, Hydrobiologia 435: 43-59.

Vanreusel, A. 2000. Meiobenthos from the central Arctic Ocean with special emphasis on the nemtode community structure. Deep-Sea Research I, 47:1855-1879.

Wieser, W. 1954. Free-living marine nematodes 2. Chromadoroidea. Reports of the Lund University Chile Expedition 1948-49, 17, Lund University, Lund 148 pp.