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Photo is an actual photo of live insect taken by me at the time listed 2023-10-01 16:43:29 at OAK airport arrival terminal for southwest flight (SWA3845) from Baltimore. It was found alive on a passenger inside the airplane while landing, captured, and euthanized in the airport terminal. All details (ie coordinates, time of photo) are exact. No other individuals were seen but a detailed search of fuselage was not performed by poster.

Host Q. agrifolia. Seems to fit some if not most of the bill, as described in Eiseman 1st Ed pg 1012. What appears to be a ridge (tentiform?) in the small blotch(?) at the end worries me. No doubt other features should, too!

On Engelmann oak in Santa Barbara botanic garden. Unlike a blister gall, there is a well defined, somewhat lumpy, mostly flat abaxial organism associated with each adaxial pimple. But unlike the plate gall that white oaks host, these don't seem detachable, plus with Andricus pattersonae there's no adaxial deformation (as there is here in this observation), just downstream damage. And this is well out of range. Last photo is probably of something completely different using the same space, but who knows?!

Host: Artemisia tridentata. Unlike anything represented for this host in Russo (Plant Galls of the Western US, 2021.) Very likely a midge however given the astonishing diversity of midge galls known to occur on this host plant.

Sacoglossan Sea Slug. Maximum length 6 mm. Rhinophores cylindrical, enrolled,
black with posterior white stripes from base to half-way up,
leaving apices completely black. Oral tentacles
completely black; foot corners yellow. Head black with two
yellow-orange patches, eyespots at base of yellow-orange
patches. Lateral yellow-orange line on head connects
yellow-orange eye patches to dorsum. Body elongate,
with numerous cylindrical cerata covering most of the
dorsum. Proximal half of cerata yellow-orange, distal half
black. Foot yellow-orange ventrally from head to tail.
Posterior end of foot is pointed, black dorsally.
Radula of a 4 mm long specimen from Catalina Island,
California (CPIC 01962) composed of 7 teeth in ascending
row, 12 teeth in descending row, and 2–4 teeth in ascus. Leading tooth smooth, lacking denticles, with a cylindrical,
short, slightly curved, pointed cusp. Base of teeth
short, triangular, slightly concave ventrally.