The nemerteans

Coe, Wesley R.

doi:10.5962/bhl.title.1985

Cited by 23 publications

(50 citation statements)

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“…Fibers that apparently are similar are observed in a number of heteronemertines (Gibson, 19796). Coe (1905) described two types of cells at the base of the epidermis, one epithelial and the other a type of anastomosing connective tissue. Electron micrographs show basal granule-containing cells that in some cases are between the epidermis and basal lamina ( Fig.…”

Section: General Structurementioning

confidence: 99%

“…The septate junction in Linens ruber is of the "pleated sheet" variety . Basal (interstitial) cells, often containing granules and associated with the basal lamina, may be seen with light microscopy in many species (Coe, 1905), but in others electron microscopy is necessary. A basiepithelial nerve supply generally is present (Burger, 1895; Strieker and Reed, 1981;Norenburg, 1982;Turbeville and Ruppert, 1983).…”

Section: General Structurementioning

confidence: 99%

“…Pigment may be distributed in the epidermis, dermis, or the body-wall musculature (Gibson, 1972;Vernet, 1983) but has not been studied in great detail (Kennedy, 1979). Intraepidermal muscle fibers arising from subepidermal perikarya are characteristic for several species of palaeonemertines (Coe, 1905;Turbeville and Ruppert, 1983). Fibers that apparently are similar are observed in a number of heteronemertines (Gibson, 19796).…”

Section: General Structurementioning

confidence: 99%

“…Most nemertines have specializations of the epidermis that function as or are related to putative sensory structures (Burger, 1897(Burger, -1907Coe, 1905;Gibson, 1972; and many others) and usually are virtually devoid of glandular cells. Pigment may be distributed in the epidermis, dermis, or the body-wall musculature (Gibson, 1972;Vernet, 1983) but has not been studied in great detail (Kennedy, 1979).…”

Section: General Structurementioning

confidence: 99%

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Structure of the Nemertine Integument with Consideration of Its Ecological and Phylogenetic Significance

Norenburg

1985

Am Zool

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SVNOPSIS. The phylum Nemertina, with more than 800 described species, occupies a wide range of habitats and figures prominently in theories of bilaterian evolution. Integuments of nemertines, from a number of habitats and representing the major orders, are compared and the general cell types constituting the epidermis are reviewed and defined. The general construction and cell demography of the integument are more or less characteristic for each order, but are not readily generalized to lower taxonomic levels. Similarly, the general structure of the integument has correlations with broad environments, but there are few conspicuous, uniquely adaptive, morphological specializations; e.g., the adhesive plate and ciliary bristles of interstitial nemertines, the tube-forming cells of Carcinonemertes epialti and various palaeonemertines, the epidermis of the pilidium larva. It is proposed that there are three generalized types of integumentary glandular cells, mucous, serous and bacillary, and that these and the ciliated cells vary only modestly across taxonomic and environmental lines. However, it is also proposed that the major structural variations of the integument not only are diagnostic for the orders but also suggest and correlate with two major evolutionary radiations of the extant nemertines, one epibenthic, the other infaunal-in that sequence. Similarities of the nemertine integument to that of turbellarians are superficial or at best plesiomorphous; i.e., they are also found in other taxa.

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Section: General Structurementioning

confidence: 99%

Section: General Structurementioning

confidence: 99%

Section: General Structurementioning

confidence: 99%

Section: General Structurementioning

confidence: 99%

See 2 more Smart Citations

Structure of the Nemertine Integument with Consideration of Its Ecological and Phylogenetic Significance

Norenburg

1985

Am Zool

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“…When looking for information on recruitment processes and the factors that influence them, one must fall back on reports of an observational nature (e.g. Coe, 1943;Riser, 1974). In the case of most nemertine species it is unknown whether they reproduce more than once during their lifetime.…”

Section: Introductionmentioning

confidence: 99%

Reproduction ofAmphiporus lactifloreus (Hoplonemertini) on tidal flats: implications for studies on the population biology of nemertines

Thiel

Dernedde

1996

Helgolander Meeresunters

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The reproductive period and life-history parameters were investigated for the hoplonemertine Amphiporus lactifloreus found on the tidal flats of the island of Sylt in the northern Wadden Sea. Every six weeks 20 individuals were collected and then histologically examined to determine the development stage of their reproductive organs. A. lactifforeus reproduces in the late autumn, its peak reproduction being in the second half of November. Individuals from all size classes > 20 mm body length produced gametes. Individuals of the cohorts that reproduced in the late autumn of 1992 persisted and grew until July 1993, indicating that A. lactifloreus is an iteroparous species. The length of relaxed individuals was significantly correlated with their length under anaesthetized conditions, but the regression changed significantly after the reproductive period. Length under 'relaxed' conditions was significantly correlated with weight (wet weight, dry weight, and ash-free dry weight); these relationships did not vary significantly before or after the reproductive period. Our results show that important life-history data of intertidal nemertines can be obtained without time-consuming histological studies. On the basis of these findings, recommendations for future studies on the population biology of intertidal nemertines are given. Regular length measurements of nemertines under 'relaxed' conditions are proposed as a useful tool for tracking the growth and survival of annual cohorts of intertidal nemertines.

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Synthesis, Optical Properties, and DNA Interaction of New Diquats Based on Triazolopyridines and Triazoloquinolines

Llabres-Campaner

Guijarro

Giarratano

et al. 2017

Chemistry A European J

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New diquat derivatives based on [1,2,3]triazolo[1,5-a]pyridine and [1,2,3]triazolo[1,5-a]quinoline have been synthesized in excellent yields. To evaluate the effect of the alkyl bridge length, ethane and propane dibromo alkane substrates were used for their synthesis. Theoretical calculations predicted a very small energetic barrier between the two possible enantiomers P (R ) and M (S ), which makes them very difficult to resolve. Thermal denaturation studies, UV/Visible spectroscopy, and fluorescence titrations with ct-DNA evidenced the intercalation of the quinoline derivatives in DNA.

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The nemerteans

Cited by 23 publications

References 0 publications

Structure of the Nemertine Integument with Consideration of Its Ecological and Phylogenetic Significance

Structure of the Nemertine Integument with Consideration of Its Ecological and Phylogenetic Significance

Reproduction ofAmphiporus lactifloreus (Hoplonemertini) on tidal flats: implications for studies on the population biology of nemertines

Synthesis, Optical Properties, and DNA Interaction of New Diquats Based on Triazolopyridines and Triazoloquinolines

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