Bioacoustics of Maghreba nkob

Description Male ( holotype ) MEASUREMENTS. Total length 3.2, carapace width 1.2. Distance PME–PME 100 µm; diameter PME 80 × 90 µm; distance PME–ALE 20 µm; diameter AME 75 µm; distance AME–AME 20 µm. Leg 1: 26.5 (7.7 + 0.5 + 7.2 + 9.3 + 1.8), tibia 2: 5.0, tibia 3: 3.8, tibia 4: 4.4; tibia 1 L/d: 58; femora 1–4 diameters: 0.20, 0.16, 0.14, 0.14. COLOR (in ethanol). Carapace pale ochre-yellow, medially darker (brown; except ocular area); sternum ochre-yellow, darker posteriorly and with darker radial marks; legs ochre-yellow, without dark rings, with black lines on femora and tibiae, very few also on metatarsi; abdomen gray, with distinct dorsal mark around heart area and dorsal and lateral whitish marks; ventrally with large dark brown mark in front of gonopore, median dark band behind gonopore divided into three parallel bands, dark brown area at spinnerets. BODY. Habitus as in Figs 199–200 . Ocular area slightly raised. Deep thoracic pit and pair of shallow furrows diverging from pit toward posterior margin. Clypeus unmodified, rim barely more sclerotized than in female. Sternum wider than long (0.85/0.60), unmodified. Abdomen slightly elongated, dorsoposteriorly weakly angular. CHELICERAE. Shape as in M. saghro gen. et sp. nov. (cf. Figs 214–215 ), but smaller (maximum width: 460 µm) and pair of frontal lateral apophyses more cylindrical in lateral view (rather as in M. stifadma gen. et sp. nov. ; cf. Fig. 234 ); distance between tips of modified hairs: 380 µm; lateral stridulatory ridges very fine, barely visible in dissecting microscope. PALPS. In general similar to congeners (cf. Figs 203–205 , 224–226 ); coxa with low retrolateral-ventral process; trochanter barely modified; femur not curved towards dorsal, distally widened and with low rounded ventral protrusion, proximally with prolateral stridulatory pick (modified hair), without retrolateral transversal line, with distinct retrolateral-ventral proximal process and very indistinct dorsal process; femur-patella joints slightly shifted toward prolateral side; tibia relatively long and slender, tibia-tarsus joints shifted toward retrolateral side; tarsus without macrotrichia; procursus ( Figs 243–245 ) with few dorsal hairs slightly curved upwards; on prolateral side with two humps, both hairless; with semitransparent ventral flap; procursus tip strongly curved towards dorsal but ending abruptly, with strong but short ventral sclerite and semitransparent process; genital bulb ( Figs 246–248 ) basal sclerite with dorsal apophysis; distal (main) sclerite large, with deep retrolateral pocket, with three ventral teeth and fine serration distally, short dorsal process, sperm duct opening not seen. LEGS. Femur 1 with single row of ~28 ventral spines; without curved hairs; with more than usual vertical hairs on all tibiae (mostly prolaterally); retrolateral trichobothrium of tibia 1 at 3.5%; prolateral trichobothrium absent on tibia 1, present on other leg tibiae; tarsal pseudosegments irregular and indistinct except ~3–5 distally. Male (variation) Tibia 1 in ten males (including holotype ): 7.2–8.8 (mean 7.9). Distance between tips of cheliceral apophyses in larger males ~400–420 µm. Ventral abdominal band variably distinct, median part sometimes reduced to small irregular marks. Males from N of Alnif with one additional ventral tooth on distal bulbal sclerite (asterisk in Fig. 246 ); males from N of Errachidia with two additional teeth in same area. Female In general similar to male ( Figs 201–202 ) but without spines on legs, with usual very low number of short vertical hairs on leg tibiae. With pair of whitish but distinct humps posteriorly on carapace, and pair of corresponding indistinct plates frontally on abdomen; with fine cheliceral stridulatory ridges as in male. Tibia 1 in nine females : 6.4–8.5 (mean 7.5). Epigynum as in Figs 251–253 , main epigynal plate triangular, weakly protruding, with pair of very low processes (in some females barely visible), medially weakly sclerotized except small brown plate anteriorly; with pair of indistinct round pockets (distance 380–420 µm); internal sclerotized arc and median round structure variably visible in uncleared specimens; posterior plate short and wide, simple; indistinct plate in front of epigynum, not elevated. Internal genitalia ( Figs 249–250 , 254–256 ) with elongated pore plates, converging anteriorly, almost contiguous; dorsal and ventral arcs medially strongly sclerotized, ventral arc with very indistinct ventral process (pocket?) directly ‘below’ (i.e., dorsal of) dark median area of epigynal plate.