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The proportions of animal inclusions and syninclusions in a sample of unselected Baltic amber from the Sambian deposit are presented.
In a small piece of Baltic amber several poorly preserved amphipod crustaceans were found. The most probable seems to be the affinity of these amphipods to the freshwater family Crangonyctidae.
The history and scope of the collection of inclusions in Baltic amber of the Muséum d’histoire naturelle Neuchâtel (MHNN) is briefly outlined. Diptera are largely dominant, with some 4600 specimens belonging to 38 families, some of which are of rare or very rare occurrence in Baltic amber. A table summarizing the families represented in the collection and including the number of specimens of each of them is provided.
Dacne (Ducne) brodzinskyi sp. nov. (Erotylidae: Dacninae), described here from amber, is the first member of the Dacninae recorded from the West Indies (Hispaniola). Dacne maculata Chûjô and D. zonaria Lewis are here transferred to the subgenus Xenodacne Boyle. A key and a checklist to all known species of Dacne Latreille are presented.
The conflicting views of Rovno amber being allochthonous, having been transported to the Pripyat area during the Eocene from the north across the sea and thus deriving from the same region as Baltic amber versus suggested local origins within the Ukrainian Crystalline Shield must have been tested by a comparison of inclusions of the Rovno and other ambers. The study of Rovno ants confirms Rovno amber being autochthonous.
Spider wasps had long been proposed to originate in the Late Cretaceous based on the Burmese amber fossil Bryopompilus interfector. We performed a morphological examination of this fossil and determined that it does not belong to Pompilidae or any other described hymenopteran family. Instead, we place it in the new family Bryopompilidae. The oldest verifiable member of the Pompilidae is from Baltic amber, which suggests that the crown group of the family probably originated in the Eocene, not in the Late Cretaceous as previously proposed. The origin of spider wasps appears to be correlated with an increase in spider familial diversity in the Cenozoic. We also add two genera to the extinct pompilid fauna: Tainopompilus Rodriguez and Pitts gen. nov. and Paleogenia Waichert and Pitts gen. nov., and describe three new species of fossil spider wasps: Anoplius planeta Rodriguez and Pitts sp. nov., from Dominican amber (Burdigalian to Langhian); Paleogenia wahisi Waichert and Pitts sp. nov., from Baltic amber (Lutetian to Priabonian); and Tainopompilus argentum Rodriguez and Pitts sp. nov., from Dominican amber (Chattian to Langhian).
We describe a fossil hydrophilid beetle Anacaena paleodominica sp. nov. from the Early Miocene amber of the Dominican Republic, which is the only definitive amber inclusion of the family Hydrophilidae documented. The species belongs to the Recent Anacaena suturalis species group known from the Nearctic, Neotropical, and Australian regions. The fossil demonstrates that representatives of the species group may already have been widespread and common by the Early Miocene, and indicates a possible Miocene/post-Miocene extinction of the aquatic insect fauna on the island of Hispaniola.
Lygistorrhina caribbiana sp. nov. (Diptera: Lygistorrhinidae), the first fossil of this extant genus, is described from Dominican amber. All other fossil Lygistorrhinidae, which are known from older amber deposits in other regions, belong to extinct genera. This is the first fossil record of this rare family in Dominican amber and the first record for Hispaniola in general as the family is currently unknown from the extant fauna.
Tonacatecutlius gibsoni gen. and sp. nov. - the first representative of the planthopper family Nogodinidae, and placed in the subtribe Nogodinina, from the Oligocene/Miocene fossil resin of Mexico is described.
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