• First species of Inbiomyia from the Atlantic Forest of Brazil (Diptera, Inbiomyiidae). (American Museum novitates, no. 3935) 

  Riccardi, Paula Raile.; Amorim, Dalton de Souza. (American Museum of Natural History., 2019-08-12)

  We describe and illustrate Inbiomyia azevedoi, sp. nov., the first species of Inbiomyiidae known from the Atlantic Forest in southeastern Brazil. SEM photos show that the bifurcated labella have on their ventral face rows ...
• New fossil birds from the earliest Eocene of Mongolia. (American Museum novitates, no. 3934) 

  Hood, Sarah C.; Torres, Chris R.; Norell, Mark.; Clarke, Julia A.; Mongolian-American Museum Paleontological Project. (American Museum of Natural History., 2019-08-09)

  Understanding of the Asian early Paleogene avifauna is limited relative to that of North American and European avifauna of the same period. While major patterns of mammalian faunal exchange among these three regions across ...
• Implications of the tympanal hearing organ and ultrastructure of chaetotaxy for the higher classification of Embioptera. (American Museum novitates, no. 3933) 

  Szumik, Claudia.; Juárez, María Laura, 1980-; Ramírez, Martín J.; Goloboff, Pablo A.; Pereyra, Verónica V. (American Museum of Natural History., 2019-07-30)

  Several slowly evolving characters are evaluated with the main objective of reinforcing the higher classification of Embioptera. An embiopteran femoral auditory organ, described here for the first time, exhibits differences ...
• Psittacosaurus amitabha, a new species of ceratopsian dinosaur from the Ondai Sayr locality, central Mongolia. (American Museum novitates, no. 3932) 

  Napoli, James G.; Hunt, Tyler.; Erickson, Gregory M.; Norell, Mark. (American Museum of Natural History., 2019-07-25)

  Psittacosaurus is the most speciose nonavian dinosaur genus, represented by at least 10 (and possibly as many as 19) species uncovered over a wide geographic range. Here, we report a new species of large-bodied Psittacosaurus ...
• Early nesting biology of the bee Caupolicana yarrowi (Cresson) (Colletidae, Diphaglossinae) and its cleptoparasite Triepeolus grandis (Friese) (Apidae, Nomadinae). (American Museum novitates, no. 3931) 

  Rozen, Jerome G., Jr. (Jerome George), 1928-; Danforth, Bryan N.; Smith, Corey Shepard.; Decker, Brenna L.; Dorian, Nicholas N.; Dority, Delina.; Kilpatrick, Shelby Kerrin.; Krichilsky, Erin.; Laws, Angela N.; Urban-Mead, Katherine R.; Cane, James H. (James Harley), 1955- (American Museum of Natural History., 2019-06-28)

  The first part of this publication, written by a group of participants in Bee Course 2018, results from the discovery of three nests of Caupolicana yarrowi (Cresson, 1875) at the base of the Chiricahua Mountains in ...
• Myrmecicultoridae, a new family of myrmecophilic spiders from the Chihuahuan Desert (Araneae, Entelegynae). (American Museum novitates, no. 3930) 

  Ramírez, Martín J.; Grismado, Cristian J.; Ubick, Darrell.; Ovcharenko, V. I.; Cushing, Paula Elizabeth, 1964-; Platnick, Norman I.; Wheeler, Ward.; Prendini, Lorenzo.; Crowley, Louise M.; Horner, Norman V. (American Museum of Natural History., 2019-06-26)

  The new genus and species Myrmecicultor chihuahuensis Ramírez, Grismado, and Ubick is described and proposed as the type of the new family, Myrmecicultoridae Ramírez, Grismado, and Ubick. The species is ecribellate, with ...
• Description of a new species of ponyfish (Teleostei, Leiognathidae, Equulitini, Photolateralis) from the Gulf of Oman. (American Museum novitates, no. 3929) 

  Sparks, John S.; Chakrabarty, Prosanta. (American Museum of Natural History., 2019-06-19)

  A new species belonging to the leiognathid genus Photolateralis, collected from the coastal waters of Oman, is described herein. Photolateralis is unique among leiognathid genera in possessing a species-specific translucent ...
• Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae). (American Museum novitates, no. 3928) 

  Hopkins, Melanie J. (American Museum of Natural History., 2019-05-07)

  The Balnibarbiinae is one of eight subfamilies of the Olenidae, a diverse family of late Cambrian to Ordovician trilobites. Balnibarbiine species occur in a relatively continuous section of deeper-water sediments exposed ...
• A new morphological dataset reveals a novel relationship for the adzebills of New Zealand (Aptornis) and provides a foundation for total evidence neoavian phylogenetics. (American Museum novitates, no. 3927) 

  Musser, Grace M.; Cracraft, Joel. (American Museum of Natural History., 2019-05-03)

  Relationships among Neoaves, a group comprising approximately 95% of all extant birds, are difficult to resolve because of multiple short internodes presumably created by a rapid evolutionary radiation around the K/Pg ...
• Karyotypes of six species of colubrid snakes from the Western Hemisphere, and the 140-million-year-old ancestral karyotype of Serpentes. (American Museum novitates, no. 3926) 

  Cole, Charles J.; Hardy, Laurence M. (American Museum of Natural History., 2019-04-29)

  Karyotypes are described for six species of snakes from the Western Hemisphere, and comparisons are made with all species of snakes from around the world that have been karyotyped with modern methods. Although there is ...
• Lower jaw of Spathites (Ammonoidea, Acanthoceratoidea) from the Upper Cretaceous (Turonian) of New Mexico. (American Museum novitates, no. 3925) 

  Landman, Neil H.; Sealey, Paul L.; Foley, Michael P.; Lucas, Spencer G. (American Museum of Natural History., 2019-04-24)

  A lower jaw was recently discovered in a limestone concretion in association with the Late Cretaceous (Turonian) ammonite Spathites puercoensis (Herrick and Johnson, 1900) from the Carlile Member of the Mancos Shale in ...
• Immature stages of selected meliponine bees (Apoidea, Apidae). (American Museum novitates, no. 3924) 

  Rozen, Jerome G., Jr. (Jerome George), 1928-; Quezada Euán, José Javier G.; Roubik, David W. (David Ward), 1951-; Smith, Corey Shepard. (American Museum of Natural History., 2019-04-08)

  This paper describes the eggs and last larval instars of certain species of bees belonging to the tribe Meliponini, one of the four related tribes that comprise the corbiculate bees in the subfamily Apinae. The four taxa ...
• A neotype for Didelphis marsupialis Linnaeus, 1758. (American Museum novitates, no. 3923) 

  Feijó, Anderson.; Voss, Robert S. (American Museum of Natural History., 2019-03-26)

  Didelphis marsupialis, type species of the genus Didelphis, is a widely distributed and commonly studied American marsupial. Unfortunately, the previously noncontroversial application of the epithet marsupialis Linnaeus, ...
• Intraspecific variation through ontogeny in late Cretaceous ammonites. (American Museum novitates, no. 3922) 

  Klein, Carina.; Landman, Neil H. (American Museum of Natural History., 2019-03-04)

  This project assesses intraspecific variation through the ontogeny of the ammonite Scaphites whitfieldi Cobban, 1951, from the Upper Cretaceous of the U.S. Western Interior. Our sample consists of 103 dorsoventral cross ...
• The phylogenetic relationships of Cretaceous biting midges, with a key to all known genera (Diptera, Ceratopogonidae). (American Museum novitates, no. 3921) 

  Borkent, Art. (American Museum of Natural History., 2019-02-25)

  The phylogenetic positions of Cretaceous species of Ceratopogonidae previously placed in the genera Archiculicoides Szadziewski, Protoculicoides Boesel, and Atriculicoides Remm are reappraised in light of synapomorphies. ...
• Unique metasomal musculature in sweat bees (Hymenoptera, Apoidea, Halictidae) revealed by micro-CT scanning. (American Museum novitates, no. 3920) 

  Herhold, Hollister W.; Davis, Steven R., 1983-; Smith, Corey Shepard.; Engel, Michael S.; Grimaldi, David A. (American Museum of Natural History., 2019-02-12)

  Bees of the family Halictidae (Apoidea: Anthophila) have three pairs of thick, bundled muscles that are circular to subcircular in cross section within the first metasomal segment, as revealed by micro-CT scanning of 16 ...
• A new Amazonian species of Adenomera (Anura, Leptodactylidae) from the Brazilian state of Pará : a tody-tyrant voice in a frog. (American Museum novitates, no. 3919) 

  Carvalho, Thiago R. de.; Giaretta, Ariovaldo A.; Angulo, Ariadne.; Haddad, Célio F. B.; Peloso, Pedro L. V. (American Museum of Natural History., 2019-02-07)

  Leptodactylid frogs are phenotypically diverse, widely distributed across the Neotropics, and are known to harbor high levels of cryptic species diversity. This is especially true in Adenomera, where several candidate ...
• Chlorocyon phantasma, a late Eocene borhyaenoid (Mammalia, Metatheria, Sparassodonta) from the Los Helados locality, Andean Main Range, central Chile. (American Museum novitates, 0003-0082 ; no. 3918) 

  Engelman, Russell K.; Flynn, John J. (John Joseph), 1955-; Gans, Phillip B., 1956-; Wyss, André R.; Croft, Darin A. (American Museum of Natural History., 2018-12-28)

  Sparassodont metatherians were the dominant terrestrial mammalian predators during South America's long Cenozoic isolation. This group's early fossil record is very poor, however, particularly for the late Eocene and early ...
• A new small barb (Cyprininae, Smiliogastrini) from the Louesse, Lekoumou (upper Niari Basin), and Djoulou (upper Ogowe Basin) rivers in the Republic of Congo, west-central Africa. (American Museum novitates, no. 3917) 

  Mamonekene, Victor.; Ibala Zamba, Armel.; Stiassny, Melanie L. J. (American Museum of Natural History., 2018-12-26)

  A new species of smiliogastrin cyprinid is described from the Louesse, Lekoumou (upper Niari basin), and Djoulou (upper Ogowe basin) rivers in the Republic of Congo, west-central Africa. The new species is readily distinguished ...
• The Cuban crocodile (Crocodylus rhombifer) from late Quaternary underwater cave deposits in the Dominican Republic. (American Museum novitates, no. 3916) 

  Morgan, Gary S.; Albury, Nancy Ann, 1955-; Rímoli, Renato O.; Lehman, Phillip.; Rosenberger, Alfred L.; Cooke, Siobhán B. (American Museum of Natural History., 2018-12-21)

  Late Quaternary fossils representing a locally extinct population of the Cuban crocodile (Crocodylus rhombifer) are reported from two underwater caves in the Dominican Republic. A large fossil sample of C. rhombifer, from ...

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