Length Width Carace length Cardiosomaarmatum Cardiosomaguanhumi Cardiosomaarmatum Cardiosomaguanhumi   Frequency % Frequency % Frequency % Frequency % 2.5-3.4 20 4.8 5 1.1 43 10.3 12 2.7 3.5-4.4 51 12.2 34 7.7 49 11.7 39 8.9 4.5-5.4 59 14.1 78 17.7 55 13.2 87 19.8 5.5-6.4 93 22.2 115 26.1 111 26.6 126 28.6 6.5-7.4 120 28.7 118 26.8 108 25.8 110 25.0 7.5-8.4 63 15.1 68 15.5 44 10.5 48 10.9 8.5-9.4 12 2.9 22 5.0 8 1.9 18 4.1 Total 418 100.0 440 100.0 418 100.0 440 100.0

Table 2: The frequency distribution of Carapace length and width of Cardiosoma armatum and Cardiosoma guahunmi from Lagos lagoon mangrove swamps in Nigeria (February to July, 2012).