Results 61 to 70 of about 103 (82)
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Zootaxa, 2015
Erpobdella borisi n. sp. is a predatory leech inhabiting cave waters in Iran. Probably, it is either a troglobiont or troglophile. The leech has no eyes, and the complete mid-body somite is divided unequally into five annuli. Results of phylogenetic analysis based on morphological characters and COI gene sequence indicate the species to be closely ...
Cichocka, Joanna M. +5 more
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Erpobdella borisi n. sp. is a predatory leech inhabiting cave waters in Iran. Probably, it is either a troglobiont or troglophile. The leech has no eyes, and the complete mid-body somite is divided unequally into five annuli. Results of phylogenetic analysis based on morphological characters and COI gene sequence indicate the species to be closely ...
Cichocka, Joanna M. +5 more
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Dina sketi n. sp., a new erpobdellid leech (Hirudinida: Erpobdellidae) from Bosnia and Herzegovina
Zootaxa, 2014The concept of the genera within the family Erpobdellidae seems to be extremely artificial. Recent phylogenetic studies (Trontelj & Sket 2000, Siddall 2002) based on morphology and DNA sequence data showed that a revision of the family was necessary because the morphological characters used to distinguish known erpobdellid genera are not ...
Grosser, Clemens +2 more
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Journal of Invertebrate Pathology, 1989
The histochemical distribution of cytoplasmic RNA in ganglion cells of the freshwater leech Nephelopsis obscura has been studied using the fluorochrome acridine orange as a marker of nucleic acids. Two series of experiments, employing 50 adult animals, involved changes in oxygen tension in the water and changes in salinity. Normal leech neurons exhibit
R N, Singhal, H B, Sarnat, R W, Davies
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The histochemical distribution of cytoplasmic RNA in ganglion cells of the freshwater leech Nephelopsis obscura has been studied using the fluorochrome acridine orange as a marker of nucleic acids. Two series of experiments, employing 50 adult animals, involved changes in oxygen tension in the water and changes in salinity. Normal leech neurons exhibit
R N, Singhal, H B, Sarnat, R W, Davies
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American Midland Naturalist, 1987
Rates of encounter with sedentary and active prey vary with a preda- tor's activity level. Experiments were conducted to determine whether observed changes in the diet of Nephelopsis obscura Verrill (Hirudinoidea:Erpobdellidae) could be attributed to reduced activity levels when hunger level is reduced. Activity levels of leeches were recorded for 1 hr
B. R. Anholt, R. W. Davies
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Rates of encounter with sedentary and active prey vary with a preda- tor's activity level. Experiments were conducted to determine whether observed changes in the diet of Nephelopsis obscura Verrill (Hirudinoidea:Erpobdellidae) could be attributed to reduced activity levels when hunger level is reduced. Activity levels of leeches were recorded for 1 hr
B. R. Anholt, R. W. Davies
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CONTRIBUTIONS TO THE BIOLOGY OF DINA SKETI GROSSER & PEŠIĆ, 2014 (HIRUDINEA: ERPOBDELLIDAE)
ACTA SCIENTIFICA BALCANICAThe known range of the species Dina sketi Grosser & Pešić, 2014 (Hirudinea: Erpobdellidae) includes several springs in the Cvrcka and Crna Rijeka basins (Republic of Srpska, Bosnia and Herzegovina). The biology of these leeches is insufficiently known.
Dejan Dmitrović +2 more
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Journal of Animal Ecology, 1982
SUMMARY (1) A population of the erpobdellid leech Erpobdella octoculata (L.) was studied over a period of 16 months in the organically polluted River Ely, South Wales. The life cycle was completed in one year. (2) Seasonal patterns of mortality were apparently related to flow, temperature and life-cycle stage.
P. M. Murphy, M. A. Learner
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SUMMARY (1) A population of the erpobdellid leech Erpobdella octoculata (L.) was studied over a period of 16 months in the organically polluted River Ely, South Wales. The life cycle was completed in one year. (2) Seasonal patterns of mortality were apparently related to flow, temperature and life-cycle stage.
P. M. Murphy, M. A. Learner
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Journal of Invertebrate Pathology, 1983
Abstract Nosema herpobdellae was recorded in populations of the leech Erpobdella octoculata from lakes in northwest England and North Wales and is redescribed using light and transmission electron microscopy. It differes from N. glossiphoniae in the nature of the infection and tissues parasitized and from N.
Stuart M. Spelling, Johnstone O. Young
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Abstract Nosema herpobdellae was recorded in populations of the leech Erpobdella octoculata from lakes in northwest England and North Wales and is redescribed using light and transmission electron microscopy. It differes from N. glossiphoniae in the nature of the infection and tissues parasitized and from N.
Stuart M. Spelling, Johnstone O. Young
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Canadian Journal of Zoology, 1989
Low salinity concentrations (1.25 and 2.5 ppt), starvation (1–4 weeks), and temperature (15 °C) produce no changes in the acridine orange – RNA fluorescence of intestinal and tegumentary epithelial cell cytoplasm of Nephelopsis obscura. However, after exposure to 5.0 ppt salinity, or starvation for 5 weeks at 20 °C, ribosomal fluorescence becomes less
R. N. Singhal +2 more
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Low salinity concentrations (1.25 and 2.5 ppt), starvation (1–4 weeks), and temperature (15 °C) produce no changes in the acridine orange – RNA fluorescence of intestinal and tegumentary epithelial cell cytoplasm of Nephelopsis obscura. However, after exposure to 5.0 ppt salinity, or starvation for 5 weeks at 20 °C, ribosomal fluorescence becomes less
R. N. Singhal +2 more
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Archiv Für Hydrobiologie, 1996
In the laboratory the freshwater invertebrate predator Nephelopsis, obscura fed ad libitum at 20°C exhibited a double-sigmoid growth pattern, with a few individuals exhibiting a single sigmoid growth pattern before death. The amount of food ingested fluctuated but two significant decreases in ingestion occurred during each sigmoid growth cycle ...
Ronald W. Davies, E. Dratnal
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In the laboratory the freshwater invertebrate predator Nephelopsis, obscura fed ad libitum at 20°C exhibited a double-sigmoid growth pattern, with a few individuals exhibiting a single sigmoid growth pattern before death. The amount of food ingested fluctuated but two significant decreases in ingestion occurred during each sigmoid growth cycle ...
Ronald W. Davies, E. Dratnal
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The Journal of Animal Ecology, 1973
Two species of leeches, Erpobdeila octoculata (L.) and Glossiphonia complanata (L.), were found in the Wilfin Beck, a small stony stream in the English Lake District. The population of G. complanata was very small and no detailed study of this species could be made.
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Two species of leeches, Erpobdeila octoculata (L.) and Glossiphonia complanata (L.), were found in the Wilfin Beck, a small stony stream in the English Lake District. The population of G. complanata was very small and no detailed study of this species could be made.
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