A new Amazonian species of Adenomera (Anura: Leptodactylidae) from the Brazilian state of Para: a tody-tyrant voice in a frog

A trilobite cluster from the Silurian Rochester Shale of New York: predation patterns and possible defensive behavior

Sea Anemones through X-rays: Visualization of Two Species of Diadumene (Cnidaria, Actiniaria) Using Micro-CT

Biostratigraphy and Diversity of Paleogene Perissodactyls from the Erlian Basin of Inner Mongolia, China

Fossil Land Tortoises (Testudines: Testudinidae) from the Dominican Republic, West Indies, with a Description of a New Species

An Introduction to the Systematics of Small-bodied Neacomys (Rodentia: Cricetidae) from Peru with Descriptions of Two New Species

A Second Specimen of Citipati Osmolskae Associated with a Nest of Eggs from Ukhaa Tolgod, Omnogov Aimag, Mongolia

New fossil birds from the earliest Eocene of Mongolia

A Review of the Pattonomys/Toromys Clade (Rodentia: Echimyidae), with Descriptions of a New Toromys Species and a New Genus

Intraspecific variation through ontogeny in Late Cretaceous ammonites

Parahelicops, Pararhabdophis, Paraphyly: Phylogenetic Relationships among Certain Southeast Asian Natricine Snakes (Hebius)

Leeches from Chiapas, Mexico, with a new species of Erpobdella (Hirudinida: Erpobdellidae)

The phylogenetic relationships of Cretaceous biting midges, with a key to all known genera (Diptera: Ceratopogonidae)

First species of Inbiomyia from the Atlantic Forest of Brazil (Diptera: Inbiomyiida)

Developmental Biology among Corbiculate Bees: Bombus impatiens, Including Observations on Its Egg Eclosion

Biological Inclusions in Amber from the Paleogene Chickaloon Formation of Alaska

The Cuban Crocodile (Crocodylus rhombifer) from Late Quaternary Underwater Cave Deposits in the Dominican Republic

Unique Metasomal Musculature in Sweat Bees (Hymenoptera: Apoidea: Halictidae) Revealed by Micro-CT Scanning

A new morphological dataset reveals a novel relationship for the adzebills of New Zealand (Aptornis) and provides a foundation for total evidence neoavian phylogenetics

Convergent Evolution of a Eusuchian-Type Secondary Palate within Shartegosuchidae

Description of a New Species of Ponyfish (Teleostei: Leiognathidae: Equulitini: Photolateralis) from the Gulf of Oman

Morphology and Evolution of Sesamoid Elements in Bats (Mammalia: Chiroptera)

Psittacosaurus amitabha, a New Species of Ceratopsian Dinosaur from the Ondai Sayr Locality, Central Mongolia

Implications of the tympanal hearing organ and ultrastructure of chaetotaxy for the higher classification of Embioptera

Chlorocyon phantasma, a Late Eocene Borhyaenoid (Mammalia: Metatheria: Sparassodonta) from the Los Helados Locality, Andean Main Range, Central Chile

A new species of Eumanota Edwards (Diptera: Mycetophilidae: Manotine) from Colombia: evidence for a pseudogondwanan pattern

New Paleogene Notohippids and Leontiniids (Toxodontia; Notoungulata; Mammalia) from the Early Oligocene Tinguiririca Fauna of the Andean Main Range, Central Chile

Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae)

First Tropical American Species of the Relict Genus Litoleptis,and Relationships in Spaniinae (Diptera: Rhagionidae )

Puyehuemyia chandleri, gen. nov., sp nov (Diptera: Opetiidae): remnant of a Cretaceous biota in Chile

Nest Architecture, Immature Stages, and Ethnoentomology of a New Species of Trigonisca from Northern Colombia (Hymenoptera: Apidae)

Myrmecicultoridae, a New Family of Myrmecophilic Spiders from the Chihuahuan Desert (Araneae: Entelegynae)

Complex Overlapping Joints between Facial Bones Allowing Limited Anterior Sliding Movements of the Snout in Diplodocid Sauropods

Early Nesting Biology of the Bee Caupolicana yarrowi (Cresson) (Colletidae: Diphaglossinae) and Its Cleptoparasite Triepeolus grandis (Friese) (Apidae: Nomadinae)

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)

The first Tertiary fossils of mammals, turtles, and fish from Canada's Yukon

In situ Observations of the Meso-Bathypelagic Scyphozoan, Deepstaria enigmatica (Semaeostomeae: Ulmaridae)

Karyotypes of Six Species of Colubrid Snakes from the Western Hemisphere, and the 140-Million-Year-Old Ancestral Karyotype of Serpentes

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)

A Revision of Philander (Marsupialia: Didelphidae), Part 1: P. quica, P. canus, and a New Species from Amazonia

Immature Stages of Selected Meliponine Bees (Apoidea: Apidae)

An unexpected new Poropanchax (Cyprinodontiformes, Procatopodidae) from the Kongo Central Province, Democratic Republic of Congo

A New Species of Forstercooperia (Perissodactyla: Paraceratheriidae) from Northern China with a Systematic Revision of Forstercooperiines

Karyotypes of the North American Parthenogenetic Whiptail Lizard Aspidoscelis velox, and Return of Aspidoscelis innotatus to the Synonymy of A. velox (Reptilia: Squamata: Teiidae)

A new collared lizard (Tropidurus: Tropiduridae) endemic to the Western Bolivian Andes and its implications for seasonally dry tropical forests

The Guardstone Spiders of the Phrurotimpus palustris Group (Araneae, Phrurolithidae)

New species of Cerambycinae and Lamiinae (Cerambycidae, Coleoptera) from Mexico

On Egg Eclosion and Larval Development in Euglossine Bees

Occurrence of Dipleura dekayi Green, 1832 (Trilobita; Homalonotidae) in the Devonian of Colombia

Nesting Biologies and Mature Larvae of Oxaeine Bees (Apoidea: Andrenidae)