Bioacoustics of Pandinurus

DIAGNOSIS. Total length 70–135 mm . External trichobothria on patella number 16–21 (5–6 eb , 3–6 esb , 2 em , 3–4 est , 3 et ); ventral trichobothria on patella number 29–59; accessory external trichobothrium ea on chela absent or present, internal trichobothria on chela number 1–4; ventral trichobothria on chela number 10– 19. Pedipalp chela manus lobiform. Dorsoexternal carina on pedipalp chela absent. Male has pronounced median lobe on movable finger of pedipalp and larger telson than female. Pectines with fulcra. Pectinal teeth number 12–22. Sternum subpentagonal, longer than wide. Carapace without distinct carinae. Dentate margins of movable and fixed fingers of pedipalp chela with distinct granules in two parallel rows present in distal half of fingers. Proximal half of fingers almost without granules in males and with distinct granules in a row in juveniles and females. These granules do not cover whole median lobe in males, but are usually represented by only several granules on top of lobe. Tergites I–VI of mesosoma bear one carina. Stridulation organ located on pedipalp coxae and first pair of legs, but can be reduced. Metasomal segments I–IV with paired, parallel ventral submedian carinae present. Telson without subaculear tubercle. Legs with one pedal spur, retrolateral spur absent.