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Hyperiid amphipods (Amphipoda, Hyperiidea) of the world's oceans: By M.E. Vinogradov, A.F. Volkov and T.N. Semenora, Science Publishers, USA, 1996, 632 pp.

P. 428 Fig. 186. Phronimella elongata (Claus)

https://library.si.edu/digital-library/book/hyperiidamphipod00vino

Possibly the second record west of the Continental Divide, the first being http://n2t.net/ark:/65665/39d93e4e8-a728-44d6-b31e-86529dc0e56e

Habitat temporary pool with much vegetation.
Image 1 - male head showing fan-shaped antennae with three pointed tips.
Image 2 - male, ventral view.
Image 3 - male right second antenna, lateral view.
Image 4 - knob at base of distal segment of male left second antenna. Although Hartland-Rowe in his 1967 description of the species describes this knob as round, it's actually more-or-less pear shaped.
Image 5 - frontal view of male head.
Image 6 - habitat.

Female. Jelly coat not visible.
Habitat: open water of lake.
H. glacialis is morphologically indistinguishable from H. gibberum, but their distributions are largely separate. The location of this specimen was very far from the area where both co-exist. See section 'Differential Diagnosis' on page 29 of the paper below:
https://www.researchgate.net/profile/Sarah-Adamowicz/publication/287753132_Three_New_Cryptic_Species_Of_The_Freshwater_Zooplankton_Genus_Holopedium_Crustacea_Branchiopoda_Ctenopoda_Revealed_By_Genetic_Methods/links/5b22930b0f7e9b0e374325fd/Three-New-Cryptic-Species-Of-The-Freshwater-Zooplankton-Genus-Holopedium-Crustacea-Branchiopoda-Ctenopoda-Revealed-By-Genetic-Methods.pdf

Parasitic copepod on leopard shark.

Shark observation here: https://www.inaturalist.org/observations/128752888

Resources:
https://www.ogfishlab.com/2021/05/09/fish-in-the-bay-may-2021-finishing-off-the-la-nina-spring/

https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=78260&inline=1

https://www.shark-references.com/literature/listBySpecies/Achtheinus-oblongus

Attached to N.P. spiny dogfish (Squalus suckleyi) caught while longlining.
From what I observed they were only attached to the top side of pectoral fins and only 1 per dogfish. 11 out of 12 observed were on the right pectoral. It was quite hard to tell the ratio as I wasn’t able to check every dogfish throughout the day but once I noticed them on the fin, they appeared to be fairly common.

Habitat small, temporary pool.
Image 1 shows left lateral anterior of male.
Image 2 shows male cercopods with the distinctive distal spines.
Image 3 shows female cercopods.
Image 4 shows male left antenna II. Need to look closely to see the small protrusion between the thumb's main ramus and the spur.
Image 5 shows male frontal appendage to be entire, not cleft.
Image 6 shows ova.

Формально ещё в географических границах моря Лаптевых, но по геоморфологической сути уже в собственно Северном Ледовитом океане. Прилов при подъёме трала с глубины 2350 м. 63 рейс НИС "Академик Мстислав Келдыш", ст. 5225.

Photo CC-BY-NC-SA license and credit and taxonomic work belongs to the Florida Museum of Natural History (FLMNH).

This observation is a part of the long-term monitoring efforts of Gustav Paulay and his team at FLMNH and Friday Harbor Labs.

Although this observation also falls within the boundaries of the MarineGEO iNaturalist umbrella project (which is an ongoing collaborative work between MarineGEO and the Tennenbaum Marine Observatories Network, the Florida Museum of Natural History, the Smithsonian’s National Museum of Natural History Museum, and our network partners), this is not from a MarineGEO specific campaign.

Habitat montane pool.
Image 1 - Male, ventral view.
Image 2 - Female, ventral view.
Image 3 - Male's 5th pair of legs, posterior view.
Image 4 - Process on antepenultimate segment of the male's right first antenna.
Image 5 - Female's 5th pair of legs.

Habitat small, alpine, astatic pool.
This arctic species was reported from this pool in 1967 by R.S. Anderson, probably arriving in Alberta via resting eggs contained in the feces of migrating waterbirds.
https://cdnsciencepub.com/doi/abs/10.1139/z67-113

Image 1 - Male, ventral view.
Image 2 - Female, ventral view.
Image 3 - Male's 5th pair of legs, posterior view.
Image 4 - The process on the antepenultimate segment of the male's right first antenna, projecting past the terminal segment.
Image 5 - Ventral view of the female's genital segment with lateral protrusions, and the ovisac.
Image 6 - Female's 5th pair of legs.
Image 7 - Specimens swimming near surface. These were preyed upon by the larger Hesperodiaptomus shoshone also inhabiting this pool (observed by myself).