Another commonly observed mystery leafminer that I'm hoping someone can collect and rear: An Ophiomyia species (Agromyzidae) that forms winding linear mines on Lantana camara, L. x hybrida, and maybe other Lantana spp., in California, Texas, Mississippi, Alabama, and Florida. The well-known species O. camarae makes a mine based on the midrib, with short extensions into the blade along either side:
@silversea_starsong, Mission, TX, 11/5/2021
The mystery mines are not based on the midrib, although they sometimes have similar short branches where they encounter lateral veins. It's conceivable that they are made by the same species, but adults need to be reared to confirm this.
@susanhewitt, Carlsbad, CA, 10/1/2019
@dan_johnson, Houston, TX, 10/6/2019
@kimberlietx, Southlake, TX, 6/16/2020 (note long lower-surface portion in this example)
@victorengel, Austin, TX, 7/2/2020
@silversea_starsong, Newport Beach, CA, 7/15/2020 (another example with a long lower-surface portion)
@silversea_starsong, Garden Grove, CA, 10/26/2020
@wsweet321, Long Beach, CA, 11/1/2020
@terit, Natchez, MS, 11/15/2020
@wsweet321, Long Beach, CA, 1/24/2021
@sessilefielder, Los Angeles Co., CA, 1/2021
@chalon9, El Cajon, CA, 7/23/2021
@joemdo, Medley, FL, 7/26/2021 (this one has a distinct frass line and may have been made by a different species)
@silversea_starsong, Orange, CA, 8/23/2021 (the first example follows the lateral veins a lot)
@biocowboy, Long Beach, CA, 8/24/2021
@wsweet321, Long Beach, CA, 9/16/2021
@milliebasden, San Diego, CA, 9/28/2021
@vcharny, Dauphin Island, AL, 10/11/2021
@silversea_starsong, Mission, TX, 11/5/2021
@sessilefielder, Los Angeles, CA, 3/13/2022