• 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 ...
• Late Quaternary fossil mammals from the Cayman Islands, West Indies. (Bulletin of the American Museum of Natural History, no. 428) 

  Morgan, Gary S.; MacPhee, R. D. E.; Woods, Roseina.; Turvey, Sam. (American Museum of Natural History., 2019-03-04)

  Abundant fossils of nesophontid lipotyphlan insectivores and capromyid rodents have been collected from late Quaternary deposits on the Cayman Islands, an island group separated by a major marine barrier from other Caribbean ...
• 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. ...
• Description of two species of Hoploscaphites (Ammonoidea, Ancyloceratina) from the Upper Cretaceous (Lower Maastrichtian) of the U.S. Western Interior. (Bulletin of the American Museum of Natural History, no. 427) 

  Landman, Neil H.; Kennedy, W. J. (William James); Larson, Neal L.; Grier, Joyce C.; Grier, James W.; Linn, Tom. (American Museum of Natural History., 2019-02-22)

  Two species of scaphitid ammonites (Ammonoidea: Ancyloceratina) from the Upper Cretaceous (lower Maastrichtian) of the Western Interior of North America are described. Hoploscaphites macer, n. sp., is medium size, with ...
• The crevice weaver spider genus Kukulcania (Araneae, Filistatidae). (Bulletin of the American Museum of Natural History, no. 426) 

  Magalhaes, Ivan L. F.; Ramírez, Martín J. (American Museum of Natural History., 2019-02-15)

  Filistatidae is one of the most phylogenetically enigmatic spider groups, and the genus Kukulcania Lehtinen includes the commonest representatives of the family. Its type species, K. hibernalis (Hentz, 1842), remains a ...
• 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 ...
• South American leaf-cutter bees (genus Megachile) of the subgenera Rhyssomegachile and Zonomegachile, with two new subgenera (Hymenoptera, Megachilidae). (Bulletin of the American Museum of Natural History, no. 425) 

  González, Víctor H.; Griswold, Terry L.; Engel, Michael S. (American Museum of Natural History., 2018-11-02)

  Leaf-cutter bees (genus Megachile Latreille) are among the most common and diverse group of bees. However, the identity and taxonomic placement of many species are problematic and species identification is often difficult. ...
• New genera and species of Myrtaceae-feeding Phylinae from Australia, and the description of a new species of Restiophylus (Insecta, Heteroptera, Miridae). (Bulletin of the American Museum of Natural History, no. 424) 

  Schwartz, Michael D.; Weirauch, Christiane.; Schuh, Randall T. (American Museum of Natural History., 2018-10-31)

  Six new genera of Australian Phylinae are described on the basis of existing collections. The tribe Exaeretini--represented by the two new genera Eucalyptophylus (two new species) and Melaleucaphylus (18 new species)--is ...
• 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, ...
• Basal Cyclorrhapha in amber from the Cretaceous and Tertiary (Insecta, Diptera), and their relationships. (Bulletin of the American Museum of Natural History, no. 423) 

  Grimaldi, David A. (American Museum of Natural History., 2018-10-24)

  Diverse new basal (aschizan) Cyclorrhapha fossilized in amber are described from the Tertiary and Cretaceous, and their relationships are examined with character-based phylogenetic hypotheses for each family or family ...
• 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 ...

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