scholarly journals Hydrodynamic pumping by serial gill arrays in the mayfly nymph Centroptilum triangulifer

2010 ◽  
Vol 213 (19) ◽  
pp. 3319-3331 ◽  
Author(s):  
A. T. Sensenig ◽  
K. T. Kiger ◽  
J. W. Shultz
Keyword(s):  
Mayfly Nymph

First fossil record of a nymph (Ephemeroptera, Teloganellidae) from the Indian subcontinent

Zootaxa ◽  
2020 ◽  
Vol 4838 (1) ◽  
pp. 137-142
Author(s):  
PRIYA AGNIHOTRI ◽  
KAJAL CHANDRA ◽  
ANUMEHA SHUKLA ◽  
HUKAM SINGH ◽  
RAKESH C. MEHROTRA
Keyword(s):  
Fossil Record ◽  
Indian Subcontinent ◽  
Early Eocene ◽  
Lignite Mine ◽  
Modern Species ◽  
The Family ◽  
Mayfly Nymph ◽  
Modern Genus ◽  
First Time ◽  
A New Species

A fossil of a mayfly nymph that shows similarities with the modern genus Teloganella Ulmer, 1939 of the family Teloganellidae is recorded for the first time from the Indian subcontinent. It is systematically described from the Gurha lignite mine of Bikaner, Rajasthan which belongs to the Palana Formation (late Paleocene-early Eocene). As assignment of the fossil to a modern species of Teloganella is difficult due to indistinguishable location of gills in the impression, a new species, Teloganella gurhaensis Agnihotri et al., sp. nov. is instituted to include this fossil naiad resembling the extant Teloganella. 

scholarly journals Do omnivorous shrimp influence mayfly nymph life history traits in a tropical island stream?

2014 ◽  
Vol 62 ◽  
pp. 41 ◽  
Author(s):  
Nicholas A. Macias ◽  
Checo Colón-Gaud ◽  
Jonathan W. Duggins ◽  
Alonso Ramírez
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Tropical Island ◽  
Mayfly Nymph

Comparative Toxicity of Larval Lampricide (TFM: 3-trifluoromethyl-4-nitrophenol) to Selected Benthic Macroinvertebrates

1975 ◽  
Vol 32 (8) ◽  
pp. 1455-1459 ◽  
Author(s):  
Alan W. Maki ◽  
Lester Geissel ◽  
Howard E. Johnson
Keyword(s):  
Locomotor Activity ◽  
Acute Toxicity ◽  
Benthic Macroinvertebrates ◽  
Orconectes Propinquus ◽  
Early Emergence ◽  
Comparative Toxicity ◽  
Mayfly Nymph ◽  
Flow Through ◽  
Blackfly Larvae ◽  
Sublethal Concentrations

The acute toxicity of larval lampricide (TFM: 3-trifluoromethyl-4-nitrophenol) to 35 species of benthic macroinvertebrates was determined in 96-h flow-through tests. The 96-h LC50 values range from 2.1 mg/liter for blackfly larvae, Simulium pugetense, to values in excess of 38.0 mg/liter for species with heavy exoskeletons: crayfish (Orconectes propinquus), dobsonfly larvae (Chauloides sp), and dragonfly naiads (Ophiogomphus sp.) Younger individuals of the clam (Ligumia sp.) and the mayfly nymph (Ephemerella cornuta) were 2 to 1.5 times more sensitive than larger individuals of the same species. Early emergence of adults and increased locomotor activity were observed among some organisms exposed to sublethal concentrations.

scholarly journals The mayfly nymph Austrophlebioides pusillus Harker defies common osmoregulatory assumptions

2017 ◽  
Vol 4 (1) ◽  
pp. 160520 ◽  
Author(s):  
Renee Dowse ◽  
Carolyn G. Palmer ◽  
Kasey Hills ◽  
Fraser Torpy ◽  
Ben J. Kefford
Keyword(s):  
Direct Result ◽  
Elevated Salinity ◽  
Freshwater Invertebrate ◽  
Mayfly Nymph ◽  
Aquarium Water ◽  
Series Of Experiments ◽  
External Salinity ◽  
Global Threat ◽  
The Relationship ◽  
Marine Salt

Osmoregulation is a key physiological function, critical for homeostasis. The basic physiological mechanisms of osmoregulation are thought to be well established. However, through a series of experiments exposing the freshwater mayfly nymph Austrophlebioides pusillus (Ephemeroptera) to increasing salinities, we present research that challenges the extent of current understanding of the relationship between osmoregulation and mortality. A. pusillus had modelled 96 h LC 10 , LC 50 and LC 99 of 2.4, 4.8 and 10 g l −1 added synthetic marine salt (SMS), respectively. They were strong osmoregulators. At aquarium water osmolality of 256 ± 3.12 mmol kg −1 (±s.e.; equivalent to 10 g l −1 added SMS), the haemolymph osmolality of A. pusillus was a much higher 401 ± 4.18 mmol kg −1 (±s.e.). The osmoregulatory capacity of A. pusillus did not break down, even at the salinity corresponding to their LC 99 , thus their mortality at this concentration is due to factors other than increased internal osmotic pressure. No freshwater invertebrate has been previously reported as suffering mortality from rises in salinity that are well below the iso-osmotic point. Recently, studies have reported reduced abundance/richness of Ephemeroptera with slightly elevated salinity. Given that salinization is an increasing global threat to freshwaters, there is an urgent need for studies into the osmophysiology of the Ephemeroptera to determine if their loss at locations with slightly elevated salinity is a direct result of external salinity or other, possibly physiological, causes.

Life spans of two species of tropical mayfly nymph (Ephemeroptera) from Magela Creek, Northern Territory

1982 ◽  
Vol 33 (1) ◽  
pp. 173 ◽  
Author(s):  
R Marchant
Keyword(s):  
Life Cycle ◽  
Life Span ◽  
Northern Territory ◽  
Annual Production ◽  
Length Frequency ◽  
Frequency Method ◽  
B Values ◽  
Size Frequency ◽  
Mayfly Nymph ◽  
Growth And Reproduction

The nymphs of Cloeon fuviatile and a species of Tasmanocoenis were common in the shallows (< 1 m) of two billabongs in Magela Creek, Northern Territory. Monthly estimates of abundance and length frequency showed that growth and reproduction occurred continuously. Estimates of the ratio of annual production to mean biomass (PIB) were calculated with the size-frequency method, using different values for nymphal life span; these estimates, when compared with P/B values predicted from the literature, suggested that the nymphs had a life span of about 1 month. Such a rapid life cycle is at least in part the result of the high mean temperature (30°C) in the shallows.

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