History of <i>Clitellata</i>

Omodeo, Pietro Daniel

doi:10.1080/11250009809386726

Cited by 52 publications

(42 citation statements)

References 36 publications

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“…portions of the male ducts (euprostates), which are strongly modified, and by the clitellum (see Omodeo, 1998). It must also be noted that the albumen tenaciously preserves the moisture of the cocoon and, being hygrophilous, is capable of restoring it if the cocoon contents are (moderately) dehydrated.…”

Section: The Cocoon and The Albumenmentioning

confidence: 99%

“…In this case, the size of the hatchling is proportional not to the ooplasm mass, but to the number of clitellar segments involved in making the cocoon, and to the amount of albumen that has been poured into it (Omodeo, 1998).…”

Section: Significance Of the Coenogenetic Evolutionmentioning

confidence: 99%

“…Elsewhere, I have pointed out (Omodeo, 1998) the opportunity to reduce the number of families to which these aquatic genera have been attributed. I here formally propose to unite all the Holarctic genera endowed with flask-shaped ovaries in the family Criodrilidae (Table I).…”

Section: The Lumbricoideamentioning

confidence: 99%

“…In a previous study (Omodeo, 1998) of the comparative biology of the Clitellata, I proposed some views on the evolutionary history of this taxon. For some families and family groups, my hypotheses were sufficiently congruent to draw precise phylogenies.…”

Section: Introductionmentioning

confidence: 99%

“…This paper deals with this aspect of oligochaete phylogeny by expanding the considerations put forward by Rota & Omodeo (1992) and by Omodeo (1998), in an attempt to best determine the relations between superfamilies and between lesser taxa.…”

Section: Introductionmentioning

confidence: 99%

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Evolution and biogeography of megadriles (Annelida, Clitellata)

Omodeo

2000

Italian Journal of Zoology

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Section: The Cocoon and The Albumenmentioning

confidence: 99%

Section: Significance Of the Coenogenetic Evolutionmentioning

confidence: 99%

Section: The Lumbricoideamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution and biogeography of megadriles (Annelida, Clitellata)

Omodeo

2000

Italian Journal of Zoology

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Embryonic development of the oligochaeteEnchytraeus coronatus: An SEM and histological study of embryogenesis from one‐cell stage to hatching

Bergter

Beck

Paululat

2004

Journal of Morphology

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We describe the embryonic development of the soil-living oligochaete Enchytraeus coronatus (Enchytraeidae, Oligochaeta, Annelida). Enchytraeus coronatus is a direct developer. It follows the typical spiral cleavage mode of development that is highly conserved among annelids and a large number of other lophotrochozoan taxa that are collectively named "Spiralia." Scanning electron microscopy (SEM) was combined with light microscopic analysis of wholemounted and sectioned embryos, differentially processed through histological stainings, to reconstruct and document cellular movements and organogenesis from early cleavage stages until hatching. With the help of these data we have established a scheme of morphologically defined stages in order to facilitate future studies on the molecular and histological level that will allow a detailed cross-species comparison among annelids and other phyla.

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Microorganization of ovaries and oogenesis of Haplotaxis sp. (Clitellata: Haplotaxidae)

Urbisz

Martin

Lagnika

et al. 2020

Journal of Morphology

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Ovaries of Haplotaxis sp. were studied in active and nonactive states, that is, in a sexually mature specimen and in specimens outside of the reproductive period. Two pairs of ovaries were found in segments XI and XII. Especially in the nonactive state, they were in close contact with copulatory glands. Each ovary was composed of germ cells interconnected with syncytial cysts, which were enveloped by a layer of somatic cells. Within cysts each germ cell had one ring canal connecting it to the common anuclear cytoplasmic mass called a cytophore. During oogenesis clustering germ cells differentiated into nurse cells and oocytes; thus, the oogenesis was recognized as meroistic. Vitellogenic oocytes were detached from the ovaries and continued yolk absorption within the body cavity. Because recent studies have shown the variety of ovaries and germ line cyst organization in clitellates and suggest their evolutionary conservatism at the family or subfamily level, the data presented here can be valid in understanding the phylogenetic relationships among Clitellata. In this context, ovaries found in Haplotaxis sp. resembled those of the "Tubifex" type. "Tubifex" ovaries are characteristic for numerous microdrile taxa (tubificines, limnodriloidines, propappids, lumbriculids, and leech-like branchiobdellids) and can be regarded as the primary character for these Clitellata in which germ-line cysts are formed during early oogenesis. As the family Haplotaxidae is currently considered to be paraphyletic and the species studied here belongs to Haplotaxidae sensu stricto, our results support the close relationship of Haplotaxidae sensu stricto to the clade consisting of Lumbriculidae, Branchiobdellida, and Hirudinida, in which lumbriculids are sister to the latter two.

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History of Clitellata

Cited by 52 publications

References 36 publications

Evolution and biogeography of megadriles (Annelida, Clitellata)

Evolution and biogeography of megadriles (Annelida, Clitellata)

Embryonic development of the oligochaeteEnchytraeus coronatus: An SEM and histological study of embryogenesis from one‐cell stage to hatching

Microorganization of ovaries and oogenesis of Haplotaxis sp. (Clitellata: Haplotaxidae)

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