The Mesozoic chironomid genus Jurochlus Kalugina, 1985, known only as pupae, is reviewed. Four new species of Jurochlus are described from the Upper Jurassic and Lower Cretaceous deposits of Mongolia, viz. J. trivittatus sp. nov., J. limbatus sp. nov., J. lineatus sp. nov. (Shar Teg, J3) and J. adustus sp. nov. (Khutel Khara, J3/K1). Both previously described species, J. sibiricus Kalugina, 198...

The black skipjack, Euthynnus lineatus, uses a centrally located vascular heat exchanger to maintain core body temperatures warmer than ambient sea water. The heat exchanger is composed of the dorsal aorta, the posterior cardinal vein, and a large vertical rete. The dorsal aorta is embedded in the posterior cardinal vein and is completely bathed in venous blood. Skipjack hemoglobin appears simi...

Lithodytes lineatus (Schneider, 1799) is a medium-sized frog distributed throughout South America and found in Brazil the Amazonia Cerrado domains. Here we document two new records of species forested areas state Amapá, Northern Brazil, provide an updated distribution map for it. The record L. Amapá extends its approximately 78 km from nearest locality, Floresta Estadual d...

This study aimed to analyze the reproductive cycle of the crab Hepatus pudibundus (Herbst, 1785). The crabs were collected in Ubatuba, SP (23 degrees 26'S and 45 degrees 02'W) monthly from the July, 1992 to June, 1993. Samplings were performed with an "otter trawl". In the laboratory the crabs were numbered, sexed and measured for their maximum carapace width. The gonad developmental stage and ...

BACKGROUND Polyandry is widespread throughout the animal kingdom. In the absence of direct benefits of mating with different males, the underlying basis for polyandry is enigmatic because it can carry considerable costs such as elevated exposure to sexual diseases, physical injury or other direct fitness costs. Such costs may be balanced by indirect genetic benefits to the offspring of polyandr...