A sediment agglutination on females of the free-living marine nematodeDesmodora schulzi

Blome, D.; Riemann, Franz

doi:10.1007/bf02365102

Cited by 7 publications

(5 citation statements)

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“…The extreme morphological uniformity of ectosymbiotic bacteria that we have demonstrated in the stilbonematid symbiosis is to our knowledge unique in invertebrate ectosymbiosis. For example, dense coats of bacteria are seen on the surface on the pompeii worm Alvinella pompejana (Polychaeta) [22], on Halicryptus spinulosus (Priapulida) [35], on Zebra cyathostomes (Nematoda) [13], and on some representatives within the Desmodoridae (Nematoda) ( [1], personal observation). However, these are composed of diverse bacterial morphotypes.…”

Section: Discussionmentioning

confidence: 99%

Chemoautotrophic, sulfur-oxidizing symbiotic bacteria on marine nematodes: Morphological and biochemical characterization

et al. 1992

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The marine, free-living Stilbonematinae (Nematoda: Desmodorida) inhabit the oxygen sulfide chemocline in marine sands. They are characterized by an association with ectosymbiotic bacteria. According to their ultrastructure the bacteria are Gram-negative and form morphologically uniform coats that cover the entire body surface of the worms. They are arranged in host-genus or host-species specific patterns: cocci form multilayered sheaths, rods, and crescent- or filament-shaped bacteria form monolayers. The detection of enzymes associated with sulfur metabolism and of ribulose-1,5 bisphosphate carboxylase oxygenase, as well as elemental sulfur in the bacteria indicate a chemolithoautotrophic nature of the symbionts. Their reproductive patterns appear to optimize space utilization on the host surface: vertically standing rods divide by longitudinal fission, whereas other bacteria form non-septate filaments of up to 100 μm length.

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Section: Discussionmentioning

confidence: 99%

Chemoautotrophic, sulfur-oxidizing symbiotic bacteria on marine nematodes: Morphological and biochemical characterization

et al. 1992

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“…Desmodorid specimens kept in the laboratory have also been observed to be sluggish (Blome & Riemann, 1987) and this may be a further factor in£uencing the colonization by ciliates. At both sites there are two species, Spirinia sp.…”

mentioning

confidence: 99%

“…If the host nematodes are sluggish in their movement as some studies suggest (Blome & Riemann, 1987), location near the tail is unlikely to be due to the reduction of friction/drag e¡ects. If the host nematodes are sluggish in their movement as some studies suggest (Blome & Riemann, 1987), location near the tail is unlikely to be due to the reduction of friction/drag e¡ects.…”

mentioning

confidence: 99%

“…This may provide the ciliates with enhanced points of attachment. Desmodorid specimens kept in the laboratory have also been observed to be sluggish (Blome & Riemann, 1987) and this may be a further factor in£uencing the colonization by ciliates. Mucus secretions by the host may also be an important in£uencing factor.…”

mentioning

confidence: 99%

“…Numerous observations of ¢xed specimens above report attachment near the tail of the host. If the host nematodes are sluggish in their movement as some studies suggest (Blome & Riemann, 1987), location near the tail is unlikely to be due to the reduction of friction/drag e¡ects. The dominant nematode in these sediments was the stilbonematid, Catanema sp.…”

mentioning

confidence: 99%

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Ciliate Hitch-hikers—Nematode ecto-commensals from tropical Australian sea grass meadows

Fisher¹

2003

J. Mar. Biol. Ass.

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The presence of suctorian ciliates attached to the cuticle of heavily ornamented free-living marine nematodes, especially the family Desmodoridae, has been reported. Observations of nematode hosts and their attached ciliates were made from samples extracted from very ¢ne muddy sands of tropical Australian sea grass meadows. Measurements of the point of attachment of the ciliates revealed that they tend to position themselves near the anus/cloaca of the nematode host.

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A New Deep-Sea Suctorian-Nematode Epibiosis (Loricophrya-Tricoma) from the Blanes Submarine Canyon (NW Mediterranean)

2017

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During a pluri-disciplinary study carried out within the frame of the Spanish research project DOS MARES, multicore samples were collected along the Blanes submarine canyon and its adjacent open slope to study the structure and dynamics of the meiofaunal organisms, mainly nematodes. Among the 5808 nematode individuals identified, only 190 of them belonged to the genus Tricoma (Desmoscolecidae), and only two harboured epibiont suctorian ciliates. The three specimens were located near the tail of the basibionts. A careful examination of the ciliates revealed that they were suctorians, which are here described as a new species of Loricophrya, namely L. mediterranea sp. nov. The new species is characterized by having a conical, slightly elongated lorica, narrowing towards posterior end; an anterior end inward curved, surrounding the lorica opening; a body placed near the lorica opening, occupying 1/3 of the lorica length, 4-8 capitate tentacles, and a peripheral, oval to sausage-shaped macronucleus. Our findings represent the first known report of an association with a deep-sea species of Tricoma, and the first record in the Mediterranean Sea, for a species of Loricophrya. The significance of the relationships between suctorian ciliates and their host in extreme environments such as deep-sea submarine canyons is discussed.

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A sediment agglutination on females of the free-living marine nematodeDesmodora schulzi

Cited by 7 publications

References 4 publications

Chemoautotrophic, sulfur-oxidizing symbiotic bacteria on marine nematodes: Morphological and biochemical characterization

Chemoautotrophic, sulfur-oxidizing symbiotic bacteria on marine nematodes: Morphological and biochemical characterization

Ciliate Hitch-hikers—Nematode ecto-commensals from tropical Australian sea grass meadows

A New Deep-Sea Suctorian-Nematode Epibiosis (Loricophrya-Tricoma) from the Blanes Submarine Canyon (NW Mediterranean)

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