The evolution of hominoid locomotor versatility: Evidence from Moroto, a 21 Ma site in Uganda.

Living hominoids are distinguished by upright torsos and versatile locomotion. It is hypothesized that these features evolved for feeding on fruit from terminal branches in forests. To investigate the evolutionary context of hominoid adaptive origins, we analyzed multiple paleoenvironmental proxies in conjunction with hominoid fossils from the Moroto II site in Uganda. The data indicate seasonally dry woodlands with the earliest evidence of abundant C4 grasses in Africa based on a confirmed age of 21 million years ago (Ma). We demonstrate that the leaf-eating hominoid Morotopithecus consumed water-stressed vegetation, and postcrania from the site indicate ape-like locomotor adaptations. These findings suggest that the origin of hominoid locomotor versatility is associated with foraging on leaves in heterogeneous, open woodlands rather than forests.

Regulatory compliance and the zebrafish.

The growth of the zebrafish as a model organism has so far greatly outpaced regulatory oversight governing its care and use in research. However, the same levels of regulation that characterize the use of traditional mammalian model animals will likely be extended to zebrafish, especially as use of the animal continues to increase. The challenge for both the zebrafish research community and regulatory agents is to ensure that emerging guidelines are sensible and serve to promote quality science and the highest standards of animal care. This brief review summarizes a panel discussion that was convened on this subject at the World Aquaculture Society's Aquaculture America 2009 Conference in Seattle, Washington. The current regulatory environment in the United States is discussed, and a set of generalized recommendations for developing new guidelines is presented.

Diagnosis and clinical management of multiple chromatophoromas in an eastern yellowbelly racer (Coluber constrictor flaviventris).

A wild-caught subadult eastern yellowbelly racer (Coluber constrictor flaviventris) presented with three raised, circumscribed, freely moveable subcutaneous masses over the dorsal and right epaxial musculature. Microscopic examination and special staining of surgically excised masses were diagnostic for chromatophoroma. No metastases were apparent on whole-body plain film radiographs and computed tomography. Additional excisional biopsies of previously affected sites performed 13 wk later demonstrated normal skin and subcutis. The snake recovered uneventfully and continued to do well 18 mo later. Surgical excision of chromatophoromas remains the treatment of choice in snakes. Subcutaneous masses in snakes should be thoroughly investigated.