• The first Tertiary fossils of mammals, turtles, and fish from Canada's Yukon. (American Museum novitates, no. 3943) 

  Eberle, Jaelyn.; Hutchison, J. Howard (John Howard), 1939-; Kennedy, Kristen.; Koenigswald, Wighart von.; MacPhee, R. D. E.; Zazula, Grant D. (American Museum of Natural History., 2019-10-31)

  Despite over a century of prospecting and field research, fossil vertebrates are exceedingly rare in Paleogene and Neogene rocks in northern Canada's Yukon Territory. Here, we describe the first records of probable Neogene ...
• Nest architecture, immature stages, and ethnoentomology of a new species of Trigonisca from northern Colombia (Hymenoptera, Apidae). (American Museum novitates, no. 3942) 

  Engel, Michael S.; Rozen, Jerome G., Jr. (Jerome George), 1928-; Sepúlveda-Cano, Paula A.; Smith, Corey Shepard.; Thomas, Jennifer C.; Ospina Torres, Rodulfo.; González, Víctor H. (American Museum of Natural History., 2019-10-18)

  Stingless bees (Apinae: Corbiculata: Meliponini) are biologically and culturally important pollinators within the tropical and subtropical areas of the world. However, limited information is available for the majority of ...
• An unexpected new Poropanchax (Cyprinodontiformes, Procatopodidae) from the Kongo Central Province, Democratic Republic of Congo. (American Museum novitates, no. 3941) 

  Van der Zee, Jouke R.; Bernotas, Kimberly.; Bragança, Pedro H. N.; Stiassny, Melanie L. J. (American Museum of Natural History., 2019-10-10)

  A new procatopodid, assigned to the genus Poropanchax, is described from a wetland habitat located adjacent to the Inga Falls in Lower Congo. Poropanchax pepo, new species, is distinguished from all congeners by a combination ...
• Egg and mature larva of a species of Plebeia with a preliminary overview of the mature larvae of the Meliponini relative to those of other corbiculate taxa (Apoidea, Apidae). (American Museum novitates, no. 3940) 

  Rozen, Jerome G., Jr. (Jerome George), 1928-; Smith, Corey Shepard.; Roubik, David W. (David Ward), 1951- (American Museum of Natural History., 2019-09-27)

  The egg and mature larva of a presently unnamed species of the bee genus Plebeia are anatomically described, illustrated, and compared with those of other known Meliponini, based on abundant specimens collected from two ...
• Larval anatomy of the bee Tetragonula sapiens (Cockerell) (Meliponini) ; Further on the larva of Melipona fallax Camargo and Pedro, with a preliminary characterization of mature larval Meliponini ; and Analysis of multipronged spicules (Apoidea, Apidae). (American Museum novitates, no. 3939) 

  Rozen, Jerome G., Jr. (Jerome George), 1928-; Smith, Corey Shepard.; Archbold Expedition to New Guinea (7th : 1964) (American Museum of Natural History., 2019-09-27)

  The small (length less than 6 mm) postdefecating larva of Tetragonula (Tetragonula) sapiens (Cockerell) from the Huon Peninsula, Papua New Guinea is described and illustrated, the first representation of the immature stage ...
• New species of Cerambycinae and Lamiinae (Cerambycidae, Coleoptera) from Mexico. (American Museum novitates, no. 3938) 

  Noguera, Felipe A. (Felipe Arturo); Gutiérrez, Nayeli. (American Museum of Natural History., 2019-09-20)

  Four new species of longhorn beetles (Cerambycidae, Coleoptera) from Mexico are described herein. Three are in the subfamily Cerambycinae: Aphysotes santossilvai, sp. nov., from Veracruz (new country record for the genus), ...
• A trilobite cluster from the Silurian Rochester Shale of New York : predation patterns and possible defensive behavior. (American Museum novitates, no. 3937) 

  Bicknell, Russell D. C.; Paterson, John R.; Hopkins, Melanie J. (American Museum of Natural History., 2019-09-09)

  Evidence of predator-prey interactions in the fossil record offers important insights into extinct ecosystems. As direct predator-prey relationships are rarely preserved, records of failed predation upon prey species are ...
• Karyotypes of the North American parthenogenetic whiptail lizard Aspidoscelis velox, and return of Aspidoscelis innotatus to the synonymy of A. velox (Reptilia, Squamata, Teiidae). (American Museum novitates, no. 3936) 

  Cole, Charles J.; Cordes, James E.; Walker, James M. (James Martin) (American Museum of Natural History., 2019-08-30)

  Aspidoscelis velox is a triploid parthenogenetic species with clonal inheritance. We studied karyotypes of population samples representing diverse localities from much of its range. All specimens were triploids, but six ...
• 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 ...

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