Bioacoustics of Grandidierella bonnieroides

Diagnosis: Male, 3.3 mm (MZPA-AMPH-0008m). Head lateral cephalic lobes apically truncate. Antenna 1 flagellum with about 19 articles; accessory flagellum with one long and one distal rudimentary article. Antenna 2 with few long setae. Lower lip with fine setae only. Maxilla 1 inner plate without setae. Mandible , palp article 3 subequal to 2, posterior margin substraight, setae distal. Pereonites 1–3 with apically acute sternal spines. Gnathopod 1 enlarged in males only; coxa unproduced anterodistally. Gnathopod 1 coxa ventral margin without small spine, basis robust, half or more as broad as long, without a spine, anterior margin without stridulating ridges , posterodistal margin with setae sparse, anterodistal margin with flange weak; ischium anterior margin without flange, posterior margin with setae sparse; merus not greatly elongated, fused along its entire length with carpus, posterior margin with sparse setae, without posterodistal spine; carpus twice length of propodus, anterior margin without stridulating ridges, with setae sparse, anterior margin with no spine, a row of setae on inner face, posterior margin with submarginal spine (lacking in smaller males), strong posterodistal spine , and smaller obtuse distal spine ; propodus, anterior margin weakly setiferous, posterior margin straight or evenly convex, palm absent; dactylus more than half length of propodus. Gnathopod 2 subchelate; basis anterodistal margin without flange, posterodistal margin without robust setae, with few setae along length of basis; merus not enlarged or produced away from carpus; carpus longer than propodus, anterior margin not lobate, with a few spaced setae; propodus with few setae, palm with pair of robust setae defining palm. Pereopod 3 – 7 absent in all the Mediterranean collected specimens. Uropod 1 rami subequal, peduncle much longer than broad, distoventral spine one fifth length of peduncle. Uropod 2 biramous; peduncle without distoventral spine. Uropod 3 uniramous, ramus at least twice length of peduncle . Telson with distal fine setae only. Female, 3.25 mm (MZPA-AMPH-0008f) (sexually dimorphic characters). Sternal spines absent. Gnathopod 1 basis slender, much less than half as broad as long; carpus a little longer than propodus; propodus palm present, evenly continuous with posterior margin, posterior margin with three robust setae; dactylus significantly overlapping palm.