Bioacoustics of Diplocephalus guidoi

Description. Male : (NMBE Ar7251, paratype ): colours slightly variable. Total length: 2.04. Cephalothorax: smooth, yellowish brown (464U); 1.01 long, 0.82 wide, with cephalic post-PME lobe ( Fig. 1 ), clypeus smooth. Eyes: AME smallest, ALE largest, PME and PLE of equal size, separated by less than their diameter. Chelicerae: stridulatory striae imbricated, proximally compressed; six (five big, one small) promarginal teeth, four retromarginal denticles. Sternum: smooth, brown (465U); 0.59 long, 0.62 wide. Legs: orange-brown (153U); tibial spine formula 2211; TmI: 0.54; leg formula 4-1-2-3. Pedipalp: pale brown (467U), patella ratio length/width = 2.1 ( Fig. 7 ); tibia with one retrolateral and one prolateral trichobothrium ( Fig. 7 ); prolateral tibial apophysis small, hidden behind the tibia with marginal teeth at its tip ( Figs 6, 7 ); cymbium with glabrous retrolateral lobe, lacking a striated protrusion at its dorsal side ( Fig. 3 ); paracymbium with two basal hairs ( Fig. 3 ); tegulum with small protegulum ( Fig. 4 ); suprategular apophysis with marginal apophysis, sclerotized distal apophysis and inner apophysis with folded basal section and membranous pointy tip ( Figs 3, 4 ); embolic division complex; embolus lamellar with curved tip, continuous with the anterior radical process ( Fig. 3 ); anterior radical process distinct, directed distally, longitudinally folded without retrolateral striations, tip curved ventrally ( Figs 3, 4 ); radical tailpiece with broad tip and inner margin ( Fig. 4 ). Females : (NMBE Ar7251, paratype ): Colours slightly variable. Total length: 2.63. Cephalothorax: smooth, dark brown (1545U); 1.08 long, 0.85 wide; general appearance as male, but without cephalic lobe, clypeus squamate. Eyes: posterior row procurved, anterior row straight, AME smallest, ALE, PLE and PME of equal size, separated by less than their diameter. Chelicera: six (five big, one small) promarginal teeth, four retromarginal denticles. Sternum: smooth, brown (1535U); 0.65 long, 0.63 wide. Legs: brown (1535U); tibial spine formula 2200; TmI: 0.51; leg formula 4-1-2-3. Epigynum: pale with sclerotized sections; ventral plate bisected, bearing a round appendix on each of its two lobes; anterior side of ventral plate with orthogonal margin, posterior edges squared ( Fig. 8 ). Vulva: spermathecae globular, visible in ventral view, fertilisation ducts directed mesally ( Fig. 10 ).