Serianus cf. galapagoensis Beier, 1978

Mahnert, Volker, 2014, Pseudoscorpions (Arachnida: Pseudoscorpiones) from the Galapagos Islands (Ecuador), Revue suisse de Zoologie 121 (2), pp. 135-210 : 171-172

Serianus cf. galapagoensis Beier, 1978

SPECIMENSTUDIED: Baltra: MHNG; 13; leg. Y. Mumcuoglo (Basle) , IV. 1977. – Sombrero Chino: 1♀; northern part, littoral zone, 10 m, under Sesuvium edmonstonei , decayed leaflitterandredsoil, 21.II.1987, leg. H. Schatz (87-684).

SHORTDESCRIPTION: Carapace 1.5 timesaslongasbroad (0.60 mm / 0.40 mm), withanindistincttransversefurrow (band?), with 22 setae (5/7/4/2/4); tergalchaetotaxy: 4/5/6/5/5/8/7/7/8/8/ (4 tactilesetae)/8 (4 tactilesetae). SternalchaetotaxyIII-XI: 6+2/2 suprastigmalsetae/6+2x1 suprastigmalsetae/8/8/6/6/8/10 (4 tactilesetae)/8 (4 tactile setae), sternites VI and VII with 3 median glandular setae each, VIII with 2 glandular setae. Chelicera: 5 long, smooth setae on hand, galea of movable finger long, with short apical fork and a thin lateral branch proximal of middle; serrula exterior with 17 lamellae, rallum with 4 setae, the basal one distinctly shortest. Pedipalps: femur smooth, with a dorsal tactile seta (TS=0.44), 3.2 times longer than broad (0.51 mm / 0.16 mm), patellasmooth, 2.4 times (0.50/0.21), handwithpedicel 1.7 times longer than broad (0.51/0.39) and 1.14 times longer than finger, chela with pedicel 3.0 times longer than broad, length of finger 0.45 mm, length of chela 0.94 mm; fixed finger with 25 acute teeth, movable finger with 19 teeth (distal 9 acute); venom ducts very short, trichobothrial pattern as in S. galapagoensis . Leg I: femur 1.4 times longer thandeep (0.13/0.09), patella 1.9 timeslongerthandeep (0.21/0.11) and 1.55 times longerthanfemur, tibia 3.8 timeslongerthandeep (0.26/0.07), basifemur 2.0 times (0.09/0.05), telotarsus 2.7 timeslongerthandeep (0.11/0.04) and 1.2 timeslongerthan basitarsus. LegIV: femur+patella 2.8 timeslongerthandeep (0.49/0.18), tibia 3.5 times (0.36/0.10), atactilesetainproximalthird (TS=0.30), basitarsus 2.0 times (0.12/0.06), telotarsus 2.9 timeslongerthandeep (0.16/0.05), basitarsuswithabasal tactile seta (TS= 0.16), telotarsus 1.3 times longer than basitarsus. Arolia and claws as in galapagoensis .

The specimen from Baltra shows also an divergent tergal chaetotaxy (tergites I-VI 6-5-6-6-6-8..), the morphological and morphometric values are within the variability range of those of S. galapagoensis .

REMARKS: These specimens show an irregular, asymmetrical tergal chaetotaxy (particularly on tergites III-V), and are, for this reason, separated from typical S. galapagoensis (no such variation has been observed on the numerous specimens examined). No other morphological differences are evident.