Jon Sweetman

Hopefully the job will be more stable 😄

Chimarra (Trichoptera: Philopotamidae). Head capsule with asymmetrical notch on frontoclyetus; membranous T-shaped labrum

Chimarra (Trichoptera:Philopotomidae). Foreleg showing subapical process on coxa

Chimerra (Trichoptera: Philopotamidae)

#Macroinvertebrate for this week: Chimarra (Trichoptera: Philopotamidae) a net-spinning caddisfly collected from Centre County, PA. T-shaped labrum; assymetrical notch on frontoclypeus and long slender process on coxa of foreleg.. #caddisflies

Burrowing Mayflies. A thread Part 1: Ephemeridae, Polymitarcyidae, and (Potamanthidae) are three families of mayflies whose ecology is strongly shaped by associations with fine-sediment habitats in rivers and streams and their burrowing habits #Ephemeroptera 1/6

Dorsal view of larvae of Anthopotamus (Ephemeroptera:Potamanthidae)

Close up of head, Anthopotamus (Ephemeroptera:Potamanthidae)

Third taxa - Anthopotamus (Ephemeroptera:Potomanthidae), the "Hackle-Gills". Forked gills projecting laterally, tusks projecting beyond head. Less of a burrower. Still have cool tusks 😊 #Ephemeroptera 6/6

Head of Polymitarcyidae (Ephemeroptera). Long downward curving tusks with tubercles on upper surface

lateral view of Polymitarcyidae larvae. Long forked gills on abdominal segments 2-7.

A second family of burrowing mayflies, Ephoron spp. (Ephemeroptera:Polymitarcyidae). Downward facing tusks with tubercles on upper surface and large forked gills. Also known for having large mass emergences. #Ephemeroptera 5/6

We have a third genera of Ephemeridae, Litobranchia retrocurva (Ephemeroptera:Ephemeridae). 1st gill is small and unbranched. #Ephemeroptera 4/6

Dorsal view of head, domed frontal process, prminent whorled flagella/setae? on antennae

Detail of gills of Hexagenia

second genera of Ephemeridae! Hexagenia spp (Ephemeroptera:Ephemeridae). Note the rounded/conical frontal processand whorled setae on antennae. Gorgeous gills! Hexagenia is known for large mass emergences, #Ephemeroptera 3/6

Burrowing mayfly of Ephemeroptera:Ephemeridae: Ephemera spp. Dorsal view of head. Note the forked frontal process

Burrowing mayfly of Ephemeroptera:Ephemeridae: Ephemera spp. Lateral view of head with upturned tusks

Burrowing mayfly of Ephemeroptera:Ephemeridae: Ephemera spp. Fluffy abdominal gills on dorsal area of abdomen

Below are images of Ephemera (Ephemeroptera:Ephemeridae), who often contruct U-shaped burrows in depositional substrates. Note the forked frontal process.. #Ephemeroptera 2/6

see also: diptera.de/CNC_Diptera/

New semester, first lab of my aquatic invertebrate class. Had students looking through some old samples today with Mason Ward’s help @masonsward.bsky.social. Had a beautiful Philopotamidae specimen: Chimarra spp. in a sample from half Moon Creek, PA #macroinvertebrates #Trichoptera

Sediment microbial communities in long‐term wetland restorations within the Prairie Pothole Region of the United States Hydrologic wetland restoration in the Prairie Pothole Region is a common management practice to facilitate habitat and ecosystem recovery after degradation or drainage. Little is known about the reco...

Happy Yule to me and co-authors Marinus Otte and @jonsweetman.bsky.social!! Final PhD chapter out in @restorationecology.bsky.social
Read about microbial communities in restored and natural wetlands in ND this holiday season 😊
doi.org/10.1111/rec....

I just got off an extremely depressing call with my amazing Canadian collaborators at Natural Resources Canada who are facing cuts, retirement buy-outs, and layoffs for biologists across the board. This just seems a slap in the face to scientists in Canada.

Journal retracts influential glyphosate safety study from 2000 | CBC News An influential research article that claimed a popular weed-killer was safe has been retracted 25 years after it was published, prompting environmental groups in Canada to ask the federal government t...

This seems like kind of a big deal given the tumultuous history involved... www.cbc.ca/news/health/...

Mesocosm tanks in a field with insect emergence traps

Severe thunderstorm and tornado warning this evening. We will see how our floating emergence traps fare.. the joys of outdoor mesocosms! @masonsward.bsky.social

A Home Made of Microplastics - bioGraphic Caddisfly cases from museum collections reveal that microplastics infiltrated “pristine” freshwater environments far earlier than suspected.

www.biographic.com/a-home-made-...

Plastic in every level of food web, say Sussex scientists The university study analyses more than 580 invertebrate samples from 51 sites across Sussex.

Plastic is everywhere. Even in earthworms! Find out about our new research funded by @hedgehogsociety.bsky.social and @sussex.ac.uk. www.bbc.co.uk/news/article...
@emilyzoologist1.bsky.social

Thanks for a great meeting @freshwaterscience.bsky.social!

@masonsward.bsky.social

Party on! Really enjoyable talk by Mason Ward about invertebrate residents of vernal ponds and their determinants at #sfs2025

Setting up and filling mesocosms today with @masonsward.bsky.social M

Not completely set up yet, but they will be out at Rock Springs. agsci.psu.edu/research/cen...

Pulling mesocosm tanks out of storage and cleaning them in preparation for summer experiment! Quill was happy to come out and help..

📣Join the Early Career Committee for their workshop on navigating mentorship in freshwater science!

📆Thursday, May 9, 12:00 PM EST

🌐Registration: ua-edu.zoom.us/meeting/regi...

Freshwater macroinvertebrates have been incorporating microplastics for more than 50 years.
👇 Caddisfly cases with plastics from 1971 and 1986
Paper: www.sciencedirect.com/science/arti... and @science.org news: www.science.org/content/arti...

Crane fly larvae (Tipulidae) Nice big chonker (technical term)..

Sampling aquatic invertebrate substrate cages with PhD student Ibrahim Fagbohun and colleague Dan Allen in Maryland today. A little drizzly but otherwise good field day!

Eubranchipus vernalis (Branchiopoda: Anostraca). eastern fairy shrimp #macroinvertebrates #fairyshrimp

Happy Spring! Fairy shrimp (Eubranchipus vernalis) are hatching in the local vernal
ponds

Litobranch recurvata (Ephemeroptera: Ephemeridae) larvae

Mandibular tusks

Antennae lack the big whorl like setae like in Hexagenia

1st abdominal gill is small, a single filament

A cool burrowing mayfly (Ephemeroptera: Ephemeridae) from eastern North America - from last year's class samples from a stream in central Pennsylvania. Litobrancha recurvata (McCafferty, 1971). #macroinvertebrates #Ephemeroptera

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