Análises de crescimento relativo foram realizadas para exemplares de Ucides cordatus, coletados mensalmente durante um ano na Baía das Laranjeiras, sul do Brasil. O comprimento da carapaça, o comprimento do própodo dos quelípodos e a largura do abdome tiveram suas medidas relacionadas à largura da carapaça, para verificar o dimorfismo sexual e o tamanho na maturidade morfológica. O comprimento da carapaça e do própodo dos quelípodos maior e menor apresentaram padrões de crescimento diferenciados entre os sexos, indicando serem caracteres sexuais secundários para a espécie. O programa MATURE II indicou os tamanhos de 44 e 43mm de largura de carapaça para a maturidade sexual morfológica de machos e fêmeas, respectivamente.

Morphometry and maturity of Ucides cordatus were analyzed with males and females collected during one year on a monthly basis at Laranjeiras Bay, Paraná State, Brazil. Carapace length, chelipeds propodus length and abdominal width were measured and related to carapace width to verify sexual dimorphism and size at morphological maturity of each sex. Carapace and propodus length of larger and smaller cheliped presented difference between sexes, confirming the use of both as secondary sexual characters. MATURE II program indicated 44mm and 43mm of carapace width to represent the size at sexual maturity of males and females, respectively.

Cymothoa catarinensis sp. nov. collected at Camboriú, Santa Catarina State, Brazil is described. The new species is of small size, has a cephalon that is little immersed in pereonite 1, anterolateral angles of pereonite 1 that reach or surpass the eyes and a pleon that is deeply immersed in pereonite 7. The pleopods of the new species have small, lobular accessory gills projecting from the bases. Cymothoa excisa Perty, 1830, and Cymothoa oestrum (Linnaeus, 1758) are redescribed. Both are of large size (25-35 mm in length). C. excisa has pointed anterolateral margins of pereonite 1 that reach or surpass the eyes. This species also has trilaminate pleopods in the female and bilaminate pleopods in the male. C. oestrum has rounded anterolateral margins of pereonite 1 and no visible eyes. This is the first time the latter species has been reported from Brazil. These three species are compared to four others that have been reported from Brazilian waters, namely: C. liannae Sartor & Pires, 1988; C. brasiliensis, C. gerris and C. ianuarii, all described by Schiödte & Meinert, 1884. A key is provided to aid in the separation of the Brazilian species of Cymothoa.

O autor estudou quase todas as espécies da família Sphaeromatidae (Isopoda), da Coleção de Crustacea do USNM, e a espécie constante do catálogo 102151 USNM, na época, não possuia identificação razão pela qual o autor enquadrou no gênero Cymodoce. Hoje está classificada como Exosphaeroma madrasensis Srinivasan, 1959. Este gênero não condiz com as características da espécie motivo pelo qual o autor procedeu a transferência para o gênero Cymodoce Leach, 1814, e estabeleceu nova combinação Cymodoce madrasensis (Srinivasan, 1959).

The author studying a male of Exosphaeroma madrasensis Srinivasan, 1959, catalog 102151 Division of Crustacea - USNM, describes and transfers the species to the genus Cymodoce Leach, 1814 establishing a new combination Cymodoce madrasensis (Srinivasan, 1959).