Bioacoustics of Nerudia guirnalda

( FIGS 1F , 25 , 26 ) Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. org:act: 7EF740D6-19C7-4A45-97BA-2FB853B8FB 2F . Diagnosis: Distinguished from most known congeners by shape of procursus ( Fig. 25A–C ; wide in lateral view, with prolateral–ventral ridge proximally), from the similar N. trigo by armature of male chelicerae ( Fig. 25G, H ; strong frontal apophyses pointing downward, with flattened tip; set with strong hairs), from some congeners also by bulbal processes ( Fig. 25D–F ; ventral apophysis slender, weakly curved, same length as embolus), and by epigynum and female internal genitalia ( Figs 25I , 26 ; epigynal plate trapezoidal, medially light, much narrower than posterior plate; internal genitalia with posteriorly wide open receptacle; similar to N. colina and N. trigo ). Type material: ARGENTINA – Catamarca : • ♂ holotype ; El Rodeo , trail to Cristo Redentor ; 28.2229° S, 65.8677° W; 1460 m a.s.l. ; 11 Mar. 2019 ; B. A. Huber and M. A. Izquierdo leg.; LABRE-Ar 590 • 3 ♂♂, 4 ♀♀ , paratypes ; same data as holotype; ZFMK Ar 23896 . Other material examined: ARGENTINA – Catamarca : • 5 ♀♀ , in pure ethanol (two prosomata used for molecular study); same data as holotype; ZFMK Arg 166, 167 • 1 ♀ ; same data as holotype; LABRE-Ar 538 • 1 ♂; El Rodeo ; Jan. 1957 ; M.E. Galiano leg.; MACN 20015 part • 2 ♂♂ , 2 ♀♀ , 1 juv. ; Mutquin; ~ 28.32° S , 66.13° W ; 2000 m a.s.l.; Jan. 1966 ; O. de Ferrariis leg.; MACN 20050 part. Etymology: The species epithet guirnalda (Spanish for a ‘garland’) is taken from Pablo Neruda’s poem ‘Sed de ti’; noun in apposition. Description Male ( holotype ). Measurements: Total body length 1.40, carapace width 0.60. Distance PME–PME 70 µm; diameter PME 60 µm; distance PME–ALE 20 µm; distance AME–AME 15 µm; diameter AME 45 µm. Leg 1: 4.80 (1.37 + 0.23 + 1.23 + 1.40 + 0.57), tibia 2: 1.03, tibia 3: 0.87, tibia 4: 1.27; tibia 1 L/d: 18. Colour (in ethanol): Prosoma and legs pale ochre-yellow; with indistinct Y-mark on carapace; legs without dark rings; abdomen ochre-yellow to light grey, with indistinct internal marks. Body: Habitus as in Figure 1F . Ocular area barely raised. Carapace with indistinct thoracic groove. Clypeus unmodified, only at rim slightly sclerotized. Sternum wider than long (0.44/0.38), with pair of low anterior processes near coxae 1. Abdomen globular. Chelicerae: As in Figure 25G, H ; with pair of short frontal apophyses pointing downward, with flattened tip, i.e. wide in frontal view, pointed in lateral view; set with strong hairs; stridulatory files on pair of low lateral protrusions. Palps: In general, similar to N. colina (cf. Fig. 4 ); coxa unmodified; trochanter with indistinct ventral projection; femur cylindrical, slightly widened distally, proximally with indistinct retrolateral hump and prolateral stridulatory pick (modified hair), femur length/width: 1.81; patella short; tibia globular (length/width: 1.05); procursus simple ( Fig. 25A–C ), wide but mostly semi-transparent in lateral view, with prolateral–ventral ridge proximally; genital bulb ( Fig. 25D–F ) with weakly curved ventral apophysis, embolus partly membranous. Legs: Without spines and curved hairs; with vertical hairs in two rows (prolateral, retrolateral) proximally on tibia 1 only; retrolateral trichobothrium of tibia 1 at 62%; prolateral trichobothrium absent on tibia 1; tarsus 1 with ~six pseudosegments, distally distinct. Variation (male): Tibia 1 in six males (including holotype ): 1.22–1.47 (mean 1.33). Female: In general, similar to male but sternum without pair of anterior humps. Tibia 1 in ten females : 1.08–1.33 (mean 1.22). Epigynum ( Fig. 26A ) anterior plate weakly protruding, trapezoidal, medially light; posterior plate wide but short. Internal genitalia ( Figs 25I , 26B–D ) with posteriorly wide open receptacle. Distribution: Known from two localities in the Cerro el Manchao region in Catamarca , Argentina ( Fig. 3 ). Natural history: At the type locality the spiders were found by turning rocks along the trail in low forest.