• 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 ...
• A new species of Eumanota Edwards (Diptera, Mycetophilidae, Manotine) from Colombia : evidence for a pseudogondwanan pattern. (American Museum novitates, no. 3915) 

  Amorim, Dalton de Souza.; Oliveira, Sarah S.; Henao-Sepulvéda, Andrea C. (American Museum of Natural History., 2018-12-18)

  Eumanota wolffae, sp. nov., is described from the high Andean forests of Colombia. This is the first Neotropical species of the clade of non-Manota genera of the mycetophilid subfamily Manotinae--to date known entirely ...
• Biostratigraphy and diversity of Paleogene perissodactyls from the Erlian Basin of Inner Mongolia, China. 

  Bai, Bin, 1981-; Wang, Yuan-qing.; Li, Qian (Paleontologist); Wang, Hai-bing.; Mao, Fang-yuan.; Gong, Yan-xin.; Meng, Jin (Paleontologist) (American Museum of Natural History., 2018-12-14)

  Extant perissodactyls (horses, rhinos, and tapirs) comprise a small portion of living mammals, but fossil perissodactyls were more diverse and commonly dominated Paleogene faunas. Unfortunately, the taxonomy and distribution ...
• An introduction to the systematics of small-bodied Neacomys (Rodentia, Cricetidae) from Peru with descriptions of two new species. (American Museum novitates, no. 3913) 

  Sánchez-Vendizú, Pamela.; Pacheco Torres, Víctor R. (Víctor Rául); Vivas-Ruiz, Dan. (American Museum of Natural History., 2018-12-10)

  The genus Neacomys includes 10 recognized species of Neotropical spiny mice in the tribe Oryzomyini. Five species have previously been reported from Peru, but the small-bodied Peruvian taxa remain unrevised. In this report, ...
• Developmental biology among corbiculate bees : Bombus impatiens, Including observations on its egg eclosion. (American Museum novitates, no. 3912) 

  Rozen, Jerome G., Jr. (Jerome George), 1928-; Smith, Corey Shepard.; Kocher, Sarah.; Wyman, Eli S. (American Museum of Natural History., 2018-12-04)

  This contribution results from an investigation of four commercially obtained colonies of Bombus (Pyrobombus) impatiens Cresson in an attempt to understand the functional anatomy and behavior of its immature stages. Eggs ...
• Complex overlapping joints between facial bones allowing limited anterior sliding movements of the snout in diplodocid sauropods. (American Museum novitates, no. 3911) 

  Tschopp, Emanuel; Mateus, Octávio; Norell, Mark. (American Museum of Natural History., 2018-10-25)

  Diplodocid sauropods had a unique skull morphology, with posteriorly retracted nares, an elongated snout, and anteriorly restricted, peglike teeth. Because of the lack of extant analogs in skull structure and tooth morphology, ...
• On egg eclosion and larval development in euglossine bees. (American Museum novitates, no. 3910) 

  Rozen, Jerome G., Jr. (Jerome George), 1928- (American Museum of Natural History., 2018-10-18)

  This study explores egg eclosion and larval biology of orchid bees (Apidae: Euglossini) in light of existing knowledge from studies dealing with a group of tribes within the Apidae referred to as corbiculate bees. It reports ...
• First tropical American species of the "relict" genus Litoleptis, and relationships in Spaniinae (Diptera, Rhagionidae). (American Museum novitates, no. 3909) 

  Grimaldi, David A. (American Museum of Natural History., 2018-10-09)

  The genus Litoleptis has consisted of nine described species, seven of them Asian and only two in the New World: L. alaskensis Chillcott, known from two specimens from northwest Alaska, and L. chilensis Hennig, known from ...
• Biological inclusions in amber from the Paleogene Chickaloon Formation of Alaska. (American Museum novitates, no. 3908) 

  Grimaldi, David A.; Sunderlin, David.; Aaroe, Georgene A.; Dempsky, Michelle R.; Parker, Nancy E.; Tillery, George Q.; White, Jaclyn G.; Barden, Phillip.; Nascimbene, Paul C.; Williams, Christopher J. (Christopher James), 1970- (American Museum of Natural History., 2018-09-28)

  The Chickaloon Formation in south-central Alaska contains rich coal deposits dated very close to the Paleocene-Eocene boundary, immediately beneath which occur dispersed nodules of amber along with abundant remains of ...
• Sea anemones through X-rays : visualization of two species of Diadumene (Cnidaria, Actiniaria) using micro-CT. (American Museum novitates, no. 3907) 

  Gusmão, Luciana Câmara, 1981-; Grajales, Alejandro.; Rodríguez, Estefania. (American Museum of Natural History., 2018-09-17)

  Diadumenidae is a monogeneric family comprised of 10 valid species in the genus Diadumene. Although these species are distributed in all but the Southern Ocean, Diadumene lineata is a cosmopolitan species and one of the ...
• Parahelicops, Pararhabdophis, paraphyly : phylogenetic relationships among certain Southeast Asian natricine snakes (Hebius). (American Museum novitates, no. 3906) 

  Kizirian, David.; Nguŷẽn, Qủang Trừơng.; Ngo, Hanh Thi.; Le, Minh Duc, 1973- (American Museum of Natural History., 2018-08-21)

  We investigate the phylogenetic relationships of two poorly known Natricinae, Parahelicops and Pararhabdophis, for which we obtained nucleotide sequence data from one mitochondrial gene (cytochrome b) and three nuclear ...
• Morphology and evolution of sesamoid elements in bats (Mammalia, Chiroptera). (American Museum novitates, no. 3905) 

  Amador, Lucila Inés.; Giannini, Norberto P.; Simmons, Nancy B.; Abdala, Virginia. (American Museum of Natural History., 2018-08-17)

  Sesamoids are skeletal elements found within a tendon or ligament as it passes around a joint or bony prominence. Here we review the distribution of sesamoids in bats, the only mammals capable of powered flight. Our survey ...

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