While some wasps are tough to ID, so are not, this is an ensign wasp, Hymenoptera, Evaniidae - the constriction at the abdomen is a dead giveaway. The larvae of the ensign wasp are parasitic in egg capsules of roaches. The adults are likely to appear in places where cockroaches appear.
Bristletails are rarely found in Dominican amber. The order Thysanura, is characterized by three long tails and long slender antennae. The body is shrimp-like. Thysanura, in particular, may be the direct ancestor of winged insects. There are also 3 or 4 fungus gnats, Diptera, Mycetophilidae. This is a good piece.
Interesting piece. This has a large long legged fly, Diptera, Dolichopodidae (?), an unknown beetle (not sure about this one), two fungus gnats, Diptera, Mycetophilidae and a moth fly. It has some other stuff also. A lot of the animals were caught at the 'interface' of two layers of resin - easily seen in the photo.
Lots of air bubbles, sometimes clouding the visibility. But among the air bubbles are a number of moving air bubbles. That water has been in the amber of 20 million years - just think about that - especially if there is an ancient virus that could wipe out life on earth. (Probably not, but an interesting thought.....) The piece is nice sized and has a barklice, Psocoptera. Also a worker ant and part of a leaf.
Almost rectangular in shape, the amber is clear. Inside this tomb is a young cock roach, Orthoptera, Blattidae. Also not far away is a barklice, Psocoptera, possibly in the family Psocidae. There is some surface glazing that slightly distracts from the specimen (which photographs VERY well as you will see in the images.)
If you recognize the wings, then you know that this is a mayfly Emphemeridae. This is a male since the cerci are so long. This specimen with all three cerci intact is very rare. Mayflies are characterized by protruding eyes. Hind wings are small and rounded or very reduced. Mayfly adults enjoy a life span of no more than two days. On the transition from nymph to adult stage, they fly from the surface of the water for mating, but do not feed. They complete their mating process and die after one or two days. This specimen is perfect.
Good sized, almost egg shaped, clear piece of amber. This is rather cool.....inside is a spider that has just pounced on a female worker ant. They are both small. Evidently this occurred just as they became stuck in the sticky resin. Talk about a moment in time. There is also a small parasitic wasp.