Search

We describe two new species of Hyalella Smith, 1874 from São Paulo state, southeastern Brazil, presenting morphological details and shedding some light on the reproductive and populational aspects of the new species. Hyalella bala n. sp. not only has a smaller mean body length in relation to H. virgineae n. sp. , but their antennas 1 and 2 are also shorter than those of H. virgineae n. sp. There is a positive but weak correlation between head size of paired males and females, and unpaired females are usually smaller than paired or ovigerous ones, for both species. The sex ratio for H. bala n. sp. favors females, while there are 28% more males than available females in H. virgineae n. sp.. Hyalella virgineae n. sp. ovigerous females carry more and larger eggs than H. bala n. sp. , probably in response to differences in habitat use. We increase to 37 the number of species of Hyalella in Brazil, and to eight in São Paulo state. [ABSTRACT FROM AUTHOR]

We describe two new species of Hyalella Smith, 1874 from São Paulo state, southeastern Brazil, presenting morphological details and shedding some light on the reproductive and populational aspects of the new species. Hyalella bala n. sp. not only has a smaller mean body length in relation to H. virgineae n. sp. , but their antennas 1 and 2 are also shorter than those of H. virgineae n. sp. There is a positive but weak correlation between head size of paired males and females, and unpaired females are usually smaller than paired or ovigerous ones, for both species. The sex ratio for H. bala n. sp. favors females, while there are 28% more males than available females in H. virgineae n. sp.. Hyalella virgineae n. sp. ovigerous females carry more and larger eggs than H. bala n. sp. , probably in response to differences in habitat use. We increase to 37 the number of species of Hyalella in Brazil, and to eight in São Paulo state. [ABSTRACT FROM AUTHOR]

Copyright of Revista Ceres is the property of Revista Ceres and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)