Pseudoscorpions (Arachnida: Pseudoscorpiones) from the Galapagos Islands (Ecuador) Author Mahnert, Volker text Revue suisse de Zoologie 2014 2014-06-30 121 2 135 210 journal article 10.5281/zenodo.6119794 0035-418X 6119794 7F3D846E-2842-41B4-9D37-18C86AE01259 Paraliochthonius pecki sp. n. Figs 14-17 HOLOTYPE : MHNG ; 13; Santa Cruz : Volcan Alcedo , littoral, sea cliff spraying, 1.-3.IV.1996 , leg. S. Peck (96-77). PARATYPES : Santa Cruz : MHNG ; 33 2♀ ; Volcan Alcedo, littoral, sea cliff spraying , 1.-3.IV.1996 , leg. S. Peck (96-77). ETYMOLOGY: The species is dedicated to Dr Stewart Peck , an eminent entomologist who studied the biogeography of the Galapagos archipelago for decades and collected the types . DIAGNOSIS: Carapace with 4 corneate eyes, epistome long and triangular; pedipalps: femur 4.7-5.1 times longer than broad, patella 2.1-2.3 times longer than broad, hand 1.9-2.0 times longer than deep, fixed 1.75-1.93 times longer than hand, chela 5.4-5.7 times longer than deep; chaetotaxy of femur 5-5-2-5, dorsum of hand with 8-9 chemosensory setae, paraxial margin of hand in distal half with two spine-like setae on tubercles, movable finger with two slightly thickened setae on paraxial side, fixed finger with 33-37 acute, erect, separate teeth, movable finger with 37-42 retrorse, flattened teeth. DESCRIPTION: Colour yellowish brown. Carapace (Fig. 14) 1.0-1.1 times longer than broad; basally narrowed, posterior margin concave, epistome long and slender, 4 corneate eyes, lens of posterior eyes flattened, chaetotaxy: 4 (plus one subocular seta on each side)-4-4-2-2, length of anterior medial seta 0.14 mm ; tergal chaetotaxy: I-III 4, IV-VI 6, VII-IX (6)7, X 4, XI 4 (2 tactile setae); manducatory process 2, pedipalpal coxa itself 3 setae (1 discal one), coxa I with finger-like lateral corner, II 3 + 3/4 coxal spines, III/IV 5, intercoxal tubercle absent; genital operculum 8-11 setae (mostly 6 marginal and 4 discal setae), male genital opening slit-like, 9 marginal/submarginal setae on each side, 4/4 internal glandular setae; sternal chaetotaxy: III/IV 6, mostly 3 suprastigmal setae each, V 10, VI-IX 9-10, X 8-9 (2 tactile setae). Pleural membrane papillostriate. FIGS 14-17 Paraliochthonius pecki sp. n. , 3 holotype . (14) Carapace. (15) Left chelicera. (16) Left pedipalp. (17) Trichobothrial pattern, with details of teeth and sensorial setae (isolated, not arranged as on finger). Scale units 0.1 mm . Chelicera (Fig. 15): 5 setae on hand, one long seta in middle of movable finger, fixed finger with about 6 mostly acute teeth (distal one larger), movable finger with about 6-7 rounded/flattened teeth, spinneret absent, serrula exterior with 22-24, serrula interior with 14-16 lamellae, rallum with 8 dentate setae. Pedipalps (Figs 16-17): trochanter 1.8-1.9 times, femur 4.7-5.1 times, patella 2.1-2.3 times longer than broad, hand 1.9-2.0 times longer than deep, fixed 1.75-1.93 times longer than hand, chela 5.4-5.7 times longer than deep; chaetotaxy of femur 5-5-2-5, slit sensillum between 3 rd and 4 th setae of anterior row, dorsum of hand with 8-9 microsetae between ib/isb and esb , paraxial margin of hand in distal half with two spine-like setae on tubercles, movable finger with two slightly thickened setae on paraxial side, no modified basal apodeme, fixed finger with 33-37 acute, erect, separate teeth (in distal half in saw-like arrangement), about 10 basal teeth somewhat smaller, movable finger with 37-42 retrorse, flattened teeth, but pointed and separate in basal third; trichobothrium ist distinctly distal to esb , sb of movable finger distinctly nearer to st than to b (about 2.7-3.2 times), 3-4 lanceolate setae near t , one single sensillum between sb and st . LegI: femur 5.4-5.9 timeslongerthandeep, patella 2.90-3.2 times, basitarsus 3.9-4.6 times, telotarsus 8.7-9.3 timeslongerthandeep; legIV: femur+patella 2.8-3.0 times, tibia 4.9-6.0 times, basitarsus 2.4-2.8 times, telotarsus 10.2-11.3 timeslonger thandeep; tarsiwithatactilesetaeachinbasalthird (TS=0.25-0.29 and 0.32-0.35 respectively). MEASUREMENTS of 43 ( 2♀ inparentheses): Totallength 1.90-1.91 (2.02-2.33). Carapace 0.65-0.66/0.60-0.64 (0.66-0.75/0.63-0.69). Pedipalps: trochanter 0.31-0.34/ 0.17-0.18 (0.37/0.19), femur 0.84-0.92/0.17-0.19 (0.88-0.96/0.18-0.19), patella 0.42- 0.44/0.19-0.21 (0.42-0.48/0.19-0.23), hand 0.46-0.48/0.23-0.24, lengthoffixedfinger 0.80-0.87 (0.87-0.95), ofmovablefinger 0.75-0.82 (0.81-0.89), lengthofchela 1.26- 1.34 (l.32-1.45). LegI: femur 0.49-0.53/0.09 (0.51-0.54/0.09-0.10), patella 0.22- 0.23/0.07-0.08 (0.23-0.27/0.08), tibia 0.25-0.28/0.06-0.07 (0.23-0.27/0.06-0.07), tarsus 0.46-0.51/0.05-0.06 (050-0.53/0.05-0.06); legIV: femur+patella 0.79-0.84/ 0.26-0.29 (0.77-0.86/0.26-0.29), tibia 0.55-0.59/0.09-0.11 (0.55-0.61/0.11-0.12), basitarsus 0.20-0.23/0.08-0.09 (0.23-0.25/0.08-0.09), telotarsus 0.53-0.56/0.05 (0.56-0.60/ 0.05-0.06). REMARKS: Paraliochthonius pecki sp. n. seems morphologically close to P. hoestlandti , recorded from Madeira , but differs from the latter by having a more slenderchela (5.4-5.7 timesvs. 4.7-5.1 times) andbythemorphology (saw-likearrangement) of the teeth on the fixed chelal finger. The new species has been collected together with Paraliochthonius litoralis sp. n. on Santa Cruz . Differences from the other species of the archipelago are summarized in the identification key.