Hapsidoxylon terpsichorum gen. et sp. nov., a stem with unusual anatomy from the Triassic of Antarctica.

The Middle Triassic flora of the Fremouw Formation in the central Transantarctic Mountains consists of conifers, cycads, ferns, pteridosperms, and sphenophytes. Stems with an unusual anatomy have been discovered within silicified peat from the same locality. The diameters of the stems range from 1.

Anatomy of umkomasia (corystospermales) from the triassic of antarctica.

The permineralized, corystosperm, cupulate, ovule-bearing organ Umkomasia resinosa is described from the early Middle Triassic of Antarctica. This is the first description of anatomically preserved Umkomasia, which consists of a determinate cupulate branch with helically arranged, recurved, pedicellate megasporophylls, each of which bears one or two abaxially attached unitegmic ovules. Cupules are ovoid, bilobed with elongate ventral and dorsal openings or unlobed with a single ventral opening, and have a two-zoned parenchymatous cortex and abundant secretory cavities.

An unusual, structurally preserved ovule from the Permian of Antarctica.

Anatomically preserved ovules are described from silicified peat of Late Permian age collected from Skaar Ridge in the central Transantarctic Mountains, Antarctica. The small ovules are significant in possessing fleshy apical appendages and a funnel-shaped micropylar extension formed by the sarcotestal layer of the integument, by which they differ from all other Permian ovules described to date. The apical modifications may have functioned in pollination and/or seed dispersal.

The first discovery of a brachiosaurid from the Asian continent.

Described here is a sauropod tooth from the Early Cretaceous of South Korea, similar to Brachiosaurus. The crown of the tooth is beveled off lingually so that when worn it presents a chisel-like edge. This find confirms the presence of a brachiosaurid in East Asia during the Early Cretaceous.

Spatial variability in oviposition damage by periodical cicadas in a fragmented landscape.

Effects of the periodical cicada (Magicicada spp.) on forest dynamics are poorly documented. A 1998 emergence of M.

Monophyly and extensive extinction of advanced eusocial bees: insights from an unexpected Eocene diversity.

Advanced eusociality sometimes is given credit for the ecological success of termites, ants, some wasps, and some bees. Comprehensive study of bees fossilized in Baltic amber has revealed an unsuspected middle Eocene (ca. 45 million years ago) diversity of eusocial bee lineages.

Osteology and skeletal development of Pyxicephalus adspersus (Anura: Ranidae: Raninae).

Despite the abundance and diversity of neobatrachians, relatively few descriptions exist of their ontogenesis and skeletal development. Herein, the adult and larval skeleton and the ontogenesis of the skeleton of the African frog, Pyxicephalus adspersus (Ranidae: Raninae), are described on the basis of cleared and double-stained, dry, and alcohol-preserved specimens. In P.