🪰 Freshwater Friday - Flat-bodied stone-clingers (Heptageniidae)
Larvae in this family of mayflies have a flattened shape, which is perfect for clinging to rocks in fast-flowing streams.
If you spot them, it’s a good sign of a healthy river.
#FreshwaterFriday #Riverfly #Heptageniidae
Larvae in this family of mayflies have a flattened shape, which is perfect for clinging to rocks in fast-flowing streams.
If you spot them, it’s a good sign of a healthy river.
#FreshwaterFriday #Riverfly #Heptageniidae
November 7, 2025 at 12:04 PM
🪰 Freshwater Friday - Flat-bodied stone-clingers (Heptageniidae)
Larvae in this family of mayflies have a flattened shape, which is perfect for clinging to rocks in fast-flowing streams.
If you spot them, it’s a good sign of a healthy river.
#FreshwaterFriday #Riverfly #Heptageniidae
Larvae in this family of mayflies have a flattened shape, which is perfect for clinging to rocks in fast-flowing streams.
If you spot them, it’s a good sign of a healthy river.
#FreshwaterFriday #Riverfly #Heptageniidae
#FreshwaterFridays #Heptageniidae #RiverflyMonitoring #Microscope #Entomology #CitizenScience #Invertebrates #Ecology #UKRivers
July 25, 2025 at 7:39 AM
#FreshwaterFriday
🔬 The flattened head of a Heptageniidae mayfly nymph, perfect for life in fast-flowing water.
💧The nymphs are specially adapted to cling to submerged rocks in high-velocity water. Their broad, flattened head and streamlined body allow them to resist against high flow conditions.
🔬 The flattened head of a Heptageniidae mayfly nymph, perfect for life in fast-flowing water.
💧The nymphs are specially adapted to cling to submerged rocks in high-velocity water. Their broad, flattened head and streamlined body allow them to resist against high flow conditions.
July 25, 2025 at 7:39 AM
#FreshwaterFriday
🔬 The flattened head of a Heptageniidae mayfly nymph, perfect for life in fast-flowing water.
💧The nymphs are specially adapted to cling to submerged rocks in high-velocity water. Their broad, flattened head and streamlined body allow them to resist against high flow conditions.
🔬 The flattened head of a Heptageniidae mayfly nymph, perfect for life in fast-flowing water.
💧The nymphs are specially adapted to cling to submerged rocks in high-velocity water. Their broad, flattened head and streamlined body allow them to resist against high flow conditions.
Selective Retention of Long-Chain Polyunsaturated Fatty Acids in Heptageniidae (Ephemeroptera) of Subalpine Streams onlinelibrary.wiley.com/doi/10.1111/... #stableisotopes
Selective Retention of Long‐Chain Polyunsaturated Fatty Acids in Heptageniidae (Ephemeroptera) of Subalpine Streams
Benthic macroinvertebrates are crucial for linking dietary energy from the base of aquatic food webs to consumers at higher trophic levels. Ephemeroptera (mayfly) grazers rely on periphyton as the...
onlinelibrary.wiley.com
June 25, 2025 at 10:37 PM
Selective Retention of Long-Chain Polyunsaturated Fatty Acids in Heptageniidae (Ephemeroptera) of Subalpine Streams onlinelibrary.wiley.com/doi/10.1111/... #stableisotopes
A Sunday morning #RiverSchool introducing families attending a Forest School Camp at Stitchcombe to the wonders of chalk streams.
Lots of invertebrates found (pictured a flat-bodied heptageniidae larva and a cased caddis), a couple of bullhead fry and some hatching mayfly too.
#riverkennet
Lots of invertebrates found (pictured a flat-bodied heptageniidae larva and a cased caddis), a couple of bullhead fry and some hatching mayfly too.
#riverkennet
May 25, 2025 at 3:39 PM
A Sunday morning #RiverSchool introducing families attending a Forest School Camp at Stitchcombe to the wonders of chalk streams.
Lots of invertebrates found (pictured a flat-bodied heptageniidae larva and a cased caddis), a couple of bullhead fry and some hatching mayfly too.
#riverkennet
Lots of invertebrates found (pictured a flat-bodied heptageniidae larva and a cased caddis), a couple of bullhead fry and some hatching mayfly too.
#riverkennet
New #checklist dataset in @gbif.org: Discovering diversity of Central Asian and Himalayan Epeorus (Caucasiron) mayflies (Ephemeroptera, Heptageniidae) using DNA barcoding and morphology https://www.gbif.org/dataset/f3d80a20-a08f-4782-8aa0-04c554c78e66
April 9, 2025 at 10:30 PM
New #checklist dataset in @gbif.org: Discovering diversity of Central Asian and Himalayan Epeorus (Caucasiron) mayflies (Ephemeroptera, Heptageniidae) using DNA barcoding and morphology https://www.gbif.org/dataset/f3d80a20-a08f-4782-8aa0-04c554c78e66
Been cooped up in the office all winter, so I went and dipped my toes in the local creek. IDs in the alt text!
#inverts
#insects
#freshwater
#inverts
#insects
#freshwater
March 31, 2025 at 8:24 PM
Been cooped up in the office all winter, so I went and dipped my toes in the local creek. IDs in the alt text!
#inverts
#insects
#freshwater
#inverts
#insects
#freshwater
Baetidae, Heptageniidae and Hydropsychidae?
March 22, 2025 at 8:40 AM
Baetidae, Heptageniidae and Hydropsychidae?
New #checklist dataset in @gbif.org: Taxonomic review of Epeorus s. l. Eaton, 1881 (Ephemeroptera: Heptageniidae) in Sapporo City and adjacent areas, Hokkaido, Japan (65 species occurrences) https://www.gbif.org/dataset/97abf0e8-64cc-43e5-b7a0-680d884001e8
March 5, 2025 at 4:30 PM
New #checklist dataset in @gbif.org: Taxonomic review of Epeorus s. l. Eaton, 1881 (Ephemeroptera: Heptageniidae) in Sapporo City and adjacent areas, Hokkaido, Japan (65 species occurrences) https://www.gbif.org/dataset/97abf0e8-64cc-43e5-b7a0-680d884001e8
学生（元）との共著論文 Taxonomic review of Epeorus s. l. Eaton, 1881 (Ephemeroptera: Heptageniidae) in Sapporo City and adjacent areas, Hokkaido, Japan doi.org/10.11646/zoo...
Taxonomic review of Epeorus s. l. Eaton, 1881 (Ephemeroptera: Heptageniidae) in Sapporo City and adjacent areas, Hokkaido, Japan
| Zootaxa
doi.org
February 27, 2025 at 12:07 PM
学生（元）との共著論文 Taxonomic review of Epeorus s. l. Eaton, 1881 (Ephemeroptera: Heptageniidae) in Sapporo City and adjacent areas, Hokkaido, Japan doi.org/10.11646/zoo...
Definitely! I'm less familiar with the fish. Macroinvertebrates are my specialty. The bug with two "tails" is a kind of predatory stonefly nymph (young form), and the one with three "tails" is a mayfly nymph in the family heptageniidae. All were found in a small stream in Kentucky.
February 26, 2025 at 11:35 PM
Definitely! I'm less familiar with the fish. Macroinvertebrates are my specialty. The bug with two "tails" is a kind of predatory stonefly nymph (young form), and the one with three "tails" is a mayfly nymph in the family heptageniidae. All were found in a small stream in Kentucky.
Aha!
The notes I'm studying say that the genus we have here that have only two cerci is Epeorus, and yep: Heptageniidae. Thank you! So happy to be learning this stuff. 🥰 🥰
The notes I'm studying say that the genus we have here that have only two cerci is Epeorus, and yep: Heptageniidae. Thank you! So happy to be learning this stuff. 🥰 🥰
February 11, 2025 at 12:28 AM
Aha!
The notes I'm studying say that the genus we have here that have only two cerci is Epeorus, and yep: Heptageniidae. Thank you! So happy to be learning this stuff. 🥰 🥰
The notes I'm studying say that the genus we have here that have only two cerci is Epeorus, and yep: Heptageniidae. Thank you! So happy to be learning this stuff. 🥰 🥰
Looking more closely, that actually might be an additional stonefly based on closer inspection of the eyes (picture 2017 on the NF Yuba R.)
But Heptageniidae only have two cerci - see baby below.
www.macroinvertebrates.org/taxa-info/ep...
But Heptageniidae only have two cerci - see baby below.
www.macroinvertebrates.org/taxa-info/ep...
February 10, 2025 at 11:36 PM
Looking more closely, that actually might be an additional stonefly based on closer inspection of the eyes (picture 2017 on the NF Yuba R.)
But Heptageniidae only have two cerci - see baby below.
www.macroinvertebrates.org/taxa-info/ep...
But Heptageniidae only have two cerci - see baby below.
www.macroinvertebrates.org/taxa-info/ep...
New #checklist dataset in @gbif.org: Two new species of the genus Thalerosphyrus Eaton, 1881 (Ephemeroptera: Heptageniidae: Ecdyonurinae) from India https://www.gbif.org/dataset/564b2519-5ebe-4838-a0d1-c00f7f1609e9
February 5, 2025 at 6:00 PM
New #checklist dataset in @gbif.org: Two new species of the genus Thalerosphyrus Eaton, 1881 (Ephemeroptera: Heptageniidae: Ecdyonurinae) from India https://www.gbif.org/dataset/564b2519-5ebe-4838-a0d1-c00f7f1609e9
The complete mitogenome dataset of the heptageniid mayfly Afronurus levis (Ephemeroptera: Heptageniidae: Ecdyonurinae) from South Korea https://pubmed.ncbi.nlm.nih.gov/39687368/
December 19, 2024 at 3:22 PM
The complete mitogenome dataset of the heptageniid mayfly Afronurus levis (Ephemeroptera: Heptageniidae: Ecdyonurinae) from South Korea https://pubmed.ncbi.nlm.nih.gov/39687368/
The complete mitogenome dataset of the heptageniid mayfly Afronurus levis (Ephemeroptera: Heptageniidae: Ecdyonurinae) from South Korea https://pubmed.ncbi.nlm.nih.gov/39687368/
December 18, 2024 at 11:45 AM
The complete mitogenome dataset of the heptageniid mayfly Afronurus levis (Ephemeroptera: Heptageniidae: Ecdyonurinae) from South Korea https://pubmed.ncbi.nlm.nih.gov/39687368/
We love this video of a Heptageniidae aka ‘Flat-headed mayfly’
💦They have a flattened head and body in order to cling to rocks
💧Their flattened tear-drop shape allows them to withstand fast flowing water
🏎 F1 use the same hydrodynamic principles to reduce wind resistance
💦They have a flattened head and body in order to cling to rocks
💧Their flattened tear-drop shape allows them to withstand fast flowing water
🏎 F1 use the same hydrodynamic principles to reduce wind resistance
November 18, 2024 at 12:28 PM
We love this video of a Heptageniidae aka ‘Flat-headed mayfly’
💦They have a flattened head and body in order to cling to rocks
💧Their flattened tear-drop shape allows them to withstand fast flowing water
🏎 F1 use the same hydrodynamic principles to reduce wind resistance
💦They have a flattened head and body in order to cling to rocks
💧Their flattened tear-drop shape allows them to withstand fast flowing water
🏎 F1 use the same hydrodynamic principles to reduce wind resistance
How long does it take for benthic macroinvertebrate assemblages to recover from a flash flood? By lifting stones from the bank of a wadeable stretch of the River Turia and within a week of the event I have gone from finding nothing to seeing gammaridae, melanopsidae and many, many heptageniidae.
November 17, 2024 at 2:04 PM
How long does it take for benthic macroinvertebrate assemblages to recover from a flash flood? By lifting stones from the bank of a wadeable stretch of the River Turia and within a week of the event I have gone from finding nothing to seeing gammaridae, melanopsidae and many, many heptageniidae.
Mitogenome-Based Phylogeny with Divergence Time Estimates Revealed the Presence of Cryptic Species within Heptageniidae (Insecta, Ephemeroptera) https://pubmed.ncbi.nlm.nih.gov/39452321/
October 27, 2024 at 4:01 PM
Mitogenome-Based Phylogeny with Divergence Time Estimates Revealed the Presence of Cryptic Species within Heptageniidae (Insecta, Ephemeroptera) https://pubmed.ncbi.nlm.nih.gov/39452321/
Mitogenome-Based Phylogeny with Divergence Time Estimates Revealed the Presence of Cryptic Species within Heptageniidae (Insecta, Ephemeroptera) https://pubmed.ncbi.nlm.nih.gov/39452321/
October 26, 2024 at 1:53 PM
Mitogenome-Based Phylogeny with Divergence Time Estimates Revealed the Presence of Cryptic Species within Heptageniidae (Insecta, Ephemeroptera) https://pubmed.ncbi.nlm.nih.gov/39452321/
New CJAI key: Nymphs of the Northeastern Nearctic Species of Rhithrogena Eaton, 1885 (Ephemeroptera: Heptageniidae): Descriptions and key. doi:10.3752/cjai.2024.51
June 21, 2024 at 6:55 PM
New CJAI key: Nymphs of the Northeastern Nearctic Species of Rhithrogena Eaton, 1885 (Ephemeroptera: Heptageniidae): Descriptions and key. doi:10.3752/cjai.2024.51
Yeah that's definitely a mayfly nymph, not a stonefly. IIRC Heptageniidae has over 500 described species, of which ~125 or so are in North & Central America, so as to *which* one it is... ¯\_(ツ)_/¯
April 27, 2024 at 6:59 PM
Yeah that's definitely a mayfly nymph, not a stonefly. IIRC Heptageniidae has over 500 described species, of which ~125 or so are in North & Central America, so as to *which* one it is... ¯\_(ツ)_/¯
your weird little wet bugs look like mayfly nymphs, because they're clinging to a rock i'd guess they are in the family Heptageniidae 😻
April 27, 2024 at 6:37 PM
your weird little wet bugs look like mayfly nymphs, because they're clinging to a rock i'd guess they are in the family Heptageniidae 😻
A) Western Pondhawk Dragonfly, male? (Erythemis collocata)
B) Flesh Fly? (Sarcopha bercaea)
C) I saw the formation of more eyes on top of your head like a mayfly... family Heptageniidae...
D) Some kind of hover fly...
E) seems like some hawk moth... family Sphingidae...
F) in reply VVV
B) Flesh Fly? (Sarcopha bercaea)
C) I saw the formation of more eyes on top of your head like a mayfly... family Heptageniidae...
D) Some kind of hover fly...
E) seems like some hawk moth... family Sphingidae...
F) in reply VVV
October 10, 2023 at 4:45 PM
A) Western Pondhawk Dragonfly, male? (Erythemis collocata)
B) Flesh Fly? (Sarcopha bercaea)
C) I saw the formation of more eyes on top of your head like a mayfly... family Heptageniidae...
D) Some kind of hover fly...
E) seems like some hawk moth... family Sphingidae...
F) in reply VVV
B) Flesh Fly? (Sarcopha bercaea)
C) I saw the formation of more eyes on top of your head like a mayfly... family Heptageniidae...
D) Some kind of hover fly...
E) seems like some hawk moth... family Sphingidae...
F) in reply VVV
D'ailleurs, j'en parlais quand je tenais le compte @ComSciComCa , les larves aquatiques d'éphéméroptères sont super pratiques pour établir des diagnostiques écologiques de certains cours d'eau https://t.co/hb3zLxEjee (ici une larve d'éphéméroptère de la famille des Heptageniidae)
December 13, 2024 at 12:47 PM
D'ailleurs, j'en parlais quand je tenais le compte @ComSciComCa , les larves aquatiques d'éphéméroptères sont super pratiques pour établir des diagnostiques écologiques de certains cours d'eau https://t.co/hb3zLxEjee (ici une larve d'éphéméroptère de la famille des Heptageniidae)