Reproductive Parameters of Porcellium Collicola (Verhoeff, 1907) and Trachelipus Arcuatus (Buddelund, 1885) (Crustacea: Isopoda: Oniscidea) in South Romania
Porcellium collicola (Verhoeff, 1907) and Trachelipus arcuatus (Budde-Lund, 1885) (Crustacea: Isopoda: Oniscidea) are two terrestrial isopod species inhabiting the leaf litter of oak forests in South Romania. This paper presents the size of reproductive females, fecundity (the number of eggs for a female for a brood), fertility (the number of larvae or mancas per female) and the relationship between the number of eggs or mancas per brood pouch and the total body length of pregnant females. In Porcellium collicola populations' reproductive females had a total body length of 3.3 to 7.3 mm, average fecundity was 18.60±7.10 eggs per female and average number of mancas per female was 10.29±8.05. In Trachelipus arcuatus the total body length of reproductive females was between 9.80 - 16.60 mm and the average number of eggs per brood per female was 55.60±21.71. A direct correlation between the size of pregnant females and fecundity and fertility was established for Porcellium collicola.