• 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 ...
• In situ observations of the meso-bathypelagic scyphozoan, Deepstaria enigmatica (Semaeostomeae, Ulmaridae). (American Museum novitates, no. 3900) 

  Gruber, David F.; Phillips, Brennan.; Marsh, Leigh.; Sparks, John S. (American Museum of Natural History., 2018-05-09)

  Deepstaria enigmatica (Semaeostomeae: Ulmaridae) is one of the largest and most mysterious invertebrate predators of the deep sea. Humans have encountered this jellyfish on only a few occasions and many questions related ...
• A second specimen of Citipati osmolskae associated with a nest of eggs from Ukhaa Tolgod, Omnogov Aimag, Mongolia. (American Museum novitates, no. 3899) 

  Norell, Mark.; Balanoff, Amy M.; Barta, Daniel E.; Erickson, Gregory M. (American Museum of Natural History., 2018-04-26)

  Adult dinosaurs preserved attending their nests in brooding positions are among the rarest vertebrate fossils. By far the most common occurrences are members of the dinosaur group Oviraptorosauria. The first finds of these ...
• Preliminary study of the bumble bee Bombus griseocollis, its eggs, their eclosion, and its larval instars and pupae (Apoidea, Apidae, Bombini). (American Museum novitates, no. 3898) 

  Rozen, Jerome G., Jr. (Jerome George), 1928-; Smith, Corey Shepard.; Johnson, Dennis E. (Dennis Earl), 1942- (American Museum of Natural History., 2018-04-04)

  This paper describes and illustrates the egg, fifth, first, and fourth larval instars, as well as the female pupa of Bombus (Cullumanobombus) griseocollis (DeGeer), all collected from a single nest in June 2017 in Wisconsin. ...
• A new species of Forstercooperia (Perissodactyla, Paraceratheriidae) from northern China with a systematic revision of forstercooperiines. (American Museum novitates, no. 3897) 

  Wang, Hai-Bing.; Bai, Bin, 1981-; Meng, Jin (Paleontologist); Wang, Yuan-qing. (American Museum of Natural History., 2018-03-21)

  Forstercooperiines are a group of large, primitive rhinocerotoids that are commonly regarded as ancestral to later giant rhinos. However, the type genus of forstercooperiines, the Middle Eocene Forstercooperia, is one of ...
• A new collared lizard (Tropidurus, Tropiduridae) endemic to the western Bolivian Andes and its implications for seasonally dry tropical forests. (American Museum novitates, no. 3896) 

  Carvalho, André L. G. (André Luiz Gomes); Rivas, Luis Rolando.; Céspedes, Ricardo.; Rodrigues, Miguel Trefaut Urbano. (American Museum of Natural History., 2018-03-19)

  In this study we describe Tropidurus azurduyae, a new species of lizard endemic to the Andes. This species is restricted to inter-Andean dry valleys of central and southern Bolivia, within the ecoregion known as Bolivian ...
• Leeches from Chiapas, Mexico, with a new species of Erpobdella (Hirudinida, Erpobdellidae). (American Museum novitates, no. 3895) 

  Tessler, Michael.; Siddall, Mark Edward, 1966-; Oceguera-Figueroa, Alejandro. (American Museum of Natural History., 2018-03-12)

  Freshwater leeches were collected from Chiapas, Mexico. Among these collections and prior records, a total of nine species were found, comprising six genera and four families. One species, Diestecostoma octannulata, ...
• A review of the Pattonomys/Toromys clade (Rodentia, Echimyidae), with descriptions of a new Toromys species and a new genus. (American Museum novitates, no. 3894) 

  Emmons, Louise.; Fabre, Pierre-Henri. (American Museum of Natural History., 2018-03-09)

  New phylogenomic analyses of South American arboreal echimyids show that there are three species within the genus Toromys (T. grandis, T. rhipidurus, and T. sp. nov.) and that the genera Pattonomys and Toromys form a clade ...
• Nesting biologies and mature larvae of oxaeine bees (Apoidea, Andrenidae). (American Museum novitates, no. 3893) 

  Rozen, Jerome G., Jr. (Jerome George), 1928- (American Museum of Natural History., 2018-02-22)

  This study encompasses a number of field encounters by the author and others with nests of representatives of three of the four genera of the little-known New World andrenid subfamily Oxaeinae. Species treated include ...
• Puyehuemyia chandleri, gen. nov., sp. nov. (Diptera, Opetiidae) : remnant of a Cretaceous biota in Chile. (American Museum novitates, no. 3892) 

  Amorim, Dalton de Souza.; Silva, Vera Cristina.; Brown, Brian Victor. (American Museum of Natural History., 2018-02-21)

  The first Opetiidae known from the Southern Hemisphere is described--Puyehuemyia chandleri, gen. nov., sp. nov.--based on a female specimen collected in Valdivian forest in the Province of Osorno, south Chile. The Palearctic ...
• A revision of Philander (Marsupialia, Didelphidae). Part 1, P. quica, P. canus, and a new species from Amazonia. (American Museum novitates, no. 3891) 

  Voss, Robert S.; Díaz-Nieto, Juan F.; Jansa, Sharon A.; Angermann, Renate. (American Museum of Natural History., 2018-01-31)

  This is the first installment of a revision of the didelphid marsupial genus Philander, commonly known as gray four-eyed opossums. Although abundant and widespread in lowland tropical forests from southern Mexico to northern ...
• Wing tracheation in Chrysopidae and other Neuropterida (Insecta) : a resolution of the confusion about vein fusion. (American Museum novitates, no. 3890) 

  Breitkreuz, Laura C. V.; Winterton, Shaun L. (Shaun Leslie); Engel, Michael S. (American Museum of Natural History., 2017-12-18)

  The wings of insects are one of their most prominent features and embody numerous characters and modifications congruent with the variety of their lifestyles. However, despite their evolutionary relevance, homology statements ...
• Osteology of a new late Cretaceous troodontid specimen from Ukhaa Tolgod, Ömnögovi Aimag, Mongolia. (American Museum novitates, no. 3889) 

  Pei, Rui.; Norell, Mark.; Barta, Daniel E.; Bever, Gabe S.; Pittman, Michael, 1985-; Xu, Xing, 1969- (American Museum of Natural History., 2017-12-15)

  A new troodontid dinosaur, Almas ukhaa, from the Late Cretaceous deposits of the Djadokhta Formation at Ukhaa Tolgod, Mongolia, is described here. The holotype specimen (IGM 100/1323) comprises an almost complete and ...
• A new genus of Eastern Hemisphere stingless bees (Hymenoptera, Apidae), with a key to the supraspecific groups of Indomalayan and Australasian Meliponini. (American Museum novitates, no. 3888) 

  Rasmussen, Claus, 1972-; Thomas, Jennifer C.; Engel, Michael S. (American Museum of Natural History., 2017-12-14)

  A new genus of stingless bees (Apinae: Meliponini) is described and figured from Indonesia (Sulawesi), known from a single species previously placed in Geniotrigona Moure. Based on recent phylogenetic studies, Trigona ...
• Molecular phylogenetics of the wrens and allies (Passeriformes, Certhioidea), with comments on the relationships of Ferminia. (American Museum novitates, no. 3887) 

  Barker, F. Keith (Frederick Keith) (American Museum of Natural History., 2017-12-08)

  The superfamily Certhioidea is distributed on four continents and while comprising relatively few species, includes forms as diverse as creepers, nuthatches, gnatcatchers, and wrens. Previous attempts to infer the phylogeny ...
• Notes on Southeast Asian stingless bees of the genus Tetragonula (Hymenoptera, Apidae), with the description of a new species from Thailand. (American Museum novitates, no. 3886) 

  Engel, Michael S.; Michener, Charles D. (Charles Duncan), 1918-2015.; Boontop, Yuvarin. (American Museum of Natural History., 2017-12-06)

  A new species of stingless bee (Apinae: Meliponini) is described from workers and two males recovered from nests in tree trunks in Kanchanaburi Province, Thailand. Tetragonula (Tetragonula) malaipanae, new species, resembles ...
• Polar bear foraging behavior during the ice-free period in western Hudson Bay : observations, origins, and potential significance. (American Museum novitates, no. 3885) 

  Gormezano, Linda J.; Ellis-Felege, Susan N.; Iles, David T.; Barnas, Andrew, 1991-; Rockwell, Robert F. (American Museum of Natural History., 2017-10-24)

  During much of the year, polar bears in western Hudson Bay use energy-conserving hunting tactics, such as still-hunting and stalking, to capture seals from sea-ice platforms. Such hunting allows these bears to accumulate ...
• A catalog of Zalmoxes (Dinosauria, Ornithopoda) specimens from the Upper Cretaceous Nălaț-Vad locality, Hațeg Basin, Romania. (American Museum novitates, no. 3884) 

  Brusatte, Stephen.; Dumbravă, Mihai.; Vremir, Mátyás.; Csiki-Sava, Zoltán.; Totoianu, Radu.; Norell, Mark. (American Museum of Natural History., 2017-10-23)

  The Transylvanian area of Romania boasts a rich fossil record of dinosaurs, which lived on an island (Haţeg Island) during the very end of the Cretaceous. Many of these are dwarfed in body size or exhibit other unusual ...

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