Bioacoustics of Armadillo officinalis

( Figures 7 (A–G), 8(A–D), 9(A–D)) Armadillo officinalis is easily recognised by its dark grey-brown colour with yellow typical muscle spots, antenna, pleon, pleotelson, pereopods and uropods strongly pigmented ( Figure 7 (A)), bigger size (male 12.5 mm ; female 10.5 mm ), smooth integument and more numerous (14) ommatidia ( Figure 7 (C)); tergite pereonite I showing denser and smaller scale-setae ( Figure 7 (C)) with two divergent lobes ( Figure 7 (D)). It differs also from A. mayeti in having narrower antenna, with the fifth article 1.5-times as long as the flagellum ( Figure 8 (A)), pereonite I with lateral groove deeper in anterior part, inner lobe not surpassing posterior margin of outer lobe ( Figure 7 (B)), caudal lamellar process with rounded apex ( Figure 7 (E)), telson nearly twice as wide as long, basal two-times longer than distal part ( Figure 9 (A)), stridulation apparatus on propodus of pereopods 4 and 5 forming row of juxtaposed globular scales ( Figure 7 (F, G)) having a less diverse chemical composition and richer in Ca (54.75%), followed by carbon rate (30.82%) and oxygen ( Table 1 ). Pereopds 1 and 7 ( Figure 8 (B, C)) are similar to those of A. mayeti , but the carpus 1 and 7 are nearly twice as long as the merus. Male pleopods 1 and 2 ( Figure 9 (C, D)) of both species are quite similar. Elements % C Ca O Al Na K Si Fe Cu Mg Total A. mayeti 58.71 19.63 13.98 4.81 0.32 0.43 0.20 0.63 1.02 − 100% A. officinalis 30.82 54.75 13.57 0.39 0.04 − 0.30 − − 0.14 100% Regarding the uropod, the protopod, nearly as long as wide, has a shorter distal part ( Figure 8 (D)); the exopodite insertion is slightly posterior to the narrowest part of the telson ( Figure 9 (B)) in A. officinalis .