• 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 ...
• Fossil land tortoises (Testudines, Testudinidae) from the Dominican Republic, West Indies, with a description of a new species. (American Museum novitates, no. 3904) 

  Albury, Nancy Ann, 1955-; Franz, Richard (Professor); Rímoli, Renato O.; Lehman, Phillip.; Rosenberger, Alfred L. (American Museum of Natural History., 2018-08-09)

  A new fossil tortoise, Chelonoidis dominicensis, is described from a flooded cave in La Altagracia Province in the southeastern Dominican Republic on the island of Hispaniola. The holotype, and only known specimen, includes ...
• New Paleogene notohippids and leontiniids (Toxodontia, Notoungulata, Mammalia) from the early Oligocene Tinguiririca Fauna of the Andean Main Range, central Chile. (American Museum novitates, no. 3903) 

  Wyss, André R.; Flynn, John J. (John Joseph), 1955-; Croft, Darin A. (American Museum of Natural History., 2018-06-25)

  Here we describe three new notohippid notoungulate species from the early Oligocene-aged Tinguiririca Fauna (Tinguirirican SALMA), recovered from volcaniclastic deposits of the Abanico Formation in the central Chilean ...
• Occurrence of Dipleura dekayi Green, 1832 (Trilobita, Homalonotidae) in the Devonian of Colombia. (American Museum novitates, no. 3902) 

  Carvalho, Maria da Gloria Pires de. (American Museum of Natural History., 2018-06-21)

  A large and almost complete dorsal exoskeleton of a homalonotid trilobite from the Middle Devonian of Colombia (Floresta Formation) is described and referred to Dipleura dekayi Green, 1832, confirming prior suggestions of ...
• Convergent evolution of a eusuchian-type secondary palate within Shartegosuchidae. (American Museum novitates, no. 3901) 

  Dollman, Kathleen N.; Clark, James Matthew, 1956-; Norell, Mark.; Xu, Xing, 1969-; Choiniere, Jonah N.; Mongolian-American Museum Paleontological Project.; Mongolyn Shinzhlėkh Ukhaany Akademi. (American Museum of Natural History., 2018-06-18)

  Shartegosuchids are a poorly known, early-branching group of Asian and North American crocodylomorphs. Shartegosuchids have been hypothesized to have eusuchian-type secondary palates, but a paucity of described material ...

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