Microscopic anatomy and ultrastructure of the digestive system of <i>Natatolana obtusata</i> (Vanhöffen, 1914) (Crustacea, Isopoda)

Storch, Völker; Štrus, Jasna; Brandt, Angelika

doi:10.1046/j.1463-6395.2002.00093.x

Cited by 10 publications

(10 citation statements)

References 34 publications

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“…This strategy, and scavenging, as seen in Cirolanidae, would seem to be the plesiomorphic strategy within this clade. Some species of Natatolana are scavengers and will enter baited traps (Arntz and Gutt 1999;Marsden 1999;Storch et al 2002). Cirolanid diversity is higher in tropical than cooler regions (Bruce 1986;Keable 1995) and correlates with a more diverse food supply, exemplified by the diversity of a typical food source: fishes.…”

Section: Radiation Ecology and Biogeographymentioning

confidence: 99%

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Higher classification of the flabelliferan and related Isopoda based on a reappraisal of relationships

Brandt

Poore²

2003

Invert. Systematics

134

121

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The history of the systematics of isopod suborders is summarised. Several authors have suggested that the traditional suborder Flabellifera is paraphyletic and includes one or more of the suborders Gnathiidea, Epicaridea and Anthuridea. Two suborders, Cymothoida and Sphaeromatidea, have been proposed as replacement taxa for the Flabellifera, but it has not been possible on the basis of phylogenetic analyses to elucidate significant relationships between the suborders and families. Morphological characters are used to explore relationships between 35 genus-, family-and suborder-level taxa of flabelliferan Isopoda in a cladistic analysis (using Phreatoicidea and Asellota as outgroups) and to derive a new classification. The analysis did not find a synapomorphy for 'Flabellifera' sensu lato, but recognises two diverging clades of 'long-tailed' isopods. Members of the Oniscidea are not part of either clade. Nor is the Tainisopidea, a new suborder erected for members of the family Tainisopidae. The Tainisopidea has many synapomorphic and plesiomorphic features, but does not share characters with either clade. The first clade comprises Phoratopidea (for Phoratopus remex) and sister-taxa Cymothoida and Limnoriidea. Representatives of these suborders have uropodal rami ventral to the pleotelson and articulating from side-to-side inside the branchial space. The new suborder, Phoratopidea, is for one species with unique, broad articles of pereopods 3 and 4 with reduced dactyls. It lacks the synapomorphies of the following two suborders. In members of the suborder Cymothoida, the mandibular molar is either a flat triangular blade, reduced to a conical process, or absent, and the maxillipedal endite is rarely longer than palp article 1 (or is absent), distally tapering and has few setae. The suborder Limnoriidea is diagnosed as lacking the mandibular molar, and the non-tapering, slender (except in Keuphylia) maxillipedal endite reaches to at least the distal margin of palp article 4. Members of the second clade share a vaulted pleotelson enclosing a branchial chamber defined by ventrolateral ridges and uropods lateral to the pleotelson margin that fold down alongside the branchial space. It comprises two suborders. Members of the Sphaeromatidea have pleonite 1 much narrower than pleonite 2 and a reduced (or absent) right lacinia mobilis fused to the spine row. They lack operculiform uropods, which characterise Valvifera. The suborder Anthuridea is reduced to superfamily rank and Epicaridea is reduced to two superfamilies within Cymothoida. Unambiguous relationships between most families are resolved, but Sphaeromatidae is suspected to be paraphyletic, Paravireia is placed as the most plesiomorphic of the Sphaeromatoidea and a new family, Basserolidae, is proposed. The Tainisopidea includes freshwater taxa in a relictual environment. The sole species of Phoratopidea is marine, rare, and its ecology is unknown. The Cymothoida is most diverse in tropical regions. Members of the most plesiomorphic family, the Cirolanidae, are mo...

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Section: Radiation Ecology and Biogeographymentioning

confidence: 99%

“…This is not to say that a few scavenging species do not reach high densities in cooler waters. Seven species of Natatolana occur in the Southern Ocean (Storch et al 2002). Only 18% of 429 species of Cirolanidae live at depths greater than 200 m (Kensley et al 1996).…”

Section: Radiation Ecology and Biogeographymentioning

confidence: 99%

Higher classification of the flabelliferan and related Isopoda based on a reappraisal of relationships

Brandt

Poore²

2003

Invert. Systematics

134

121

View full text Add to dashboard Cite

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“…Apical membranes of hepatopancreatic cells are lined with densely packed microvilli, a feature shown to be present in other isopod species [27][28][29]. Large nuclei are ovoid in shape and lacking any projections as those seen N. obtusata [27] or amphibious isopod Ligia italica under starvation [30]. Although some cells appeared to have higher amount of heterochromatin, indicative of lower gene expression and by extension lower overall activity, it was shown that in L. italica part of hepatopancreatic cells were euchromatic, while others had higher amount of heterochromatin [29].…”

Section: Discussionmentioning

confidence: 78%

“…However, it does not seem to be lined with cuticle as seen in some other species of isopods [26] or at least it is not as prominent as in other species. Most of the cell nuclei appeared ovoid or round, with no or only small protrusions compared to nuclei seen in free-living isopod Notatolana obtusata [27]. Moreover, majority of cell nuclei were euchromatic, indicative of active gene expression.…”

Section: Discussionmentioning

confidence: 86%

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Host-Parasite Interaction between Parasitic Cymothoid Ceratothoa oestroides and Its Host, Farmed European Sea Bass (Dicentrarchus labrax)

et al. 2020

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Parasitic isopod Ceratothoa oestroides (Cymothoidea, Isopoda) is a common and generalist buccal cavity-dweller in marine fish, recognised for its detrimental effect in fingerling and juvenile farmed European sea bass (Dicentrarchus labrax). Although distributed throughout the Mediterranean, the isopod provokes acute outbreaks mainly limited to particular endemic areas in Croatia (Adriatic Sea) and Greece (Aegean Sea). While numerous studies have previously evidenced its gross effect on farmed fish (i.e. decreased condition index, slower growth rate, lethargy and mortality), details on the host-parasite interaction are still lacking. Therefore, using a multimethodological approach, we closely examined the structure and appearance of isopod body parts acting in the attachment and feeding (stereomicroscopy, scanning and transmission electron microscopy), and the extent of host tissues damage (histology, immunohistochemistry, micro-computational tomography) induced by parasitation. Interestingly, while hematophagous nature of the parasite has been previously postulated we found no unambiguous data to support this; we observed host tissues fragmentation and extensive hyperplasia at the parasitation site, and no structures indicative of heme detoxifying mechanisms in the parasite gut, or other traces of a blood meal. The bacterial biofilm covering C. oestroides mouthparts and pereopods suggests that the isopod may play a role in conveying secondary pathogens to the infected host, or alternatively, it serves the parasite in normal interaction with its environment.

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Morphology and ultrastructure of the esophagus during the ontogeny of the spider crab Maja brachydactyla (Decapoda, Brachyura, Majidae)

Castejón

Rotllant

Ribes

et al. 2018

Journal of Morphology

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The esophagus of the eucrustaceans is known as a short tube that connects the mouth with the stomach but has generally received little attention by the carcinologists, especially during the larval stages. By this reason, the present study is focused on the morphology and ultrastructure of the esophagus in the brachyuran Maja brachydactyla during the larval development and adult stage. The esophagus shows internally four longitudinal folds. The simple columnar epithelium is covered by a thick cuticle. The epithelial cells of the adults are intensively interdigitated and show abundant apical mitochondria and bundles of filamentous structures. The cuticle surface has microspines and mutually exclusive pores. Three muscle layers surrounded by the connective tissue are reported: circular muscles forming a broad continuous band, longitudinal muscle bundles adjacent to the circular muscles, and dilator muscles crossing the connective tissue vertically toward the epithelium. The connective tissue has rosette glands. The esophagus of the larvae have epithelial cells with big vesicles but poorly developed interdigitations and filamentous structures, the cuticle is formed by a procuticle without differentiated exocuticle and endocuticle, the connective layer is thin and the rosette glands are absent. The observed features can be explained by his role in the swallowing of the food.

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Microscopic anatomy and ultrastructure of the digestive system of Natatolana obtusata (Vanhöffen, 1914) (Crustacea, Isopoda)

Cited by 10 publications

References 34 publications

Higher classification of the flabelliferan and related Isopoda based on a reappraisal of relationships

Higher classification of the flabelliferan and related Isopoda based on a reappraisal of relationships

Host-Parasite Interaction between Parasitic Cymothoid Ceratothoa oestroides and Its Host, Farmed European Sea Bass (Dicentrarchus labrax)

Morphology and ultrastructure of the esophagus during the ontogeny of the spider crab Maja brachydactyla (Decapoda, Brachyura, Majidae)

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