Two new species of the orb-weaving spider genus Alpaida (Araneae, Araneidae) from Peru Author Deza, Mariajosé Author Andía, Juan Manuel text Zootaxa 2014 3827 1 67 77 journal article 36822 10.11646/zootaxa.3827.1.6 6f4ce5d8-1a5c-4145-9af9-8aafb22c9921 1175-5326 286492 AE81C74A-6143-4934-9B32-47BFE95969D4 Alpaida losamigos new species ( Figures 1–9 , 34–36 ) Type material. Female holotype from PERU : Madre de Dios, Cuenca Río Los Amigos, CICRA (Los Amigos ACCA Biological Station), 12º34′07″ S 70º05′ 57″W, Sep. 24, 2005 , M. Deza coll., deposited in MEKRB (UAAr- 694/2005); same label data, three female paratypes (UAAr-104/2005). Additional material examined. None. Etymology. The specific name is a noun in apposition taken from type locality. Diagnosis. The female is distinguished from all Alpaida except A . delicata and A. sulphurea (see Levi 1988 , figs. 472−473, 640−643), by the shape of epigynum, which has a slightly curved posterior margin and median lobe ( Fig. 6 ); it differs from A . delicata by the posterior median plate narrower ( Fig. 7 ) and by the larger median lobe ( Fig. 6 ); it differs from A. sulphurea also by the narrow posterior median plate in posterior view and by lacking abdominal spines ( Figs. 1−3 ). Description. Female ( holotype ): Carapace orange white with a dark V – shaped mark. Margins of thoracic area dark ( Fig 4 ). Eye measurements: AME 0.15, ALE 0.11, PME 0.14, PLE 0.12, AME-ALE 0.40, PME-PLE 0.47, AME-AME 0.11, PME-PME 0.12. Chelicerae pale orange with three retromarginal and four promarginal teeth; sternum pale orange with a dark central spot; labium, endites light orange ( Fig. 5 ). Legs yellowish white with dark marks covering 2/3 distal parts of each article, except femora. Abdomen elongate, narrower at the end, with three pairs of indistinct black-spotted humps. Dorsum of abdomen light brown with a longitudinal white guanine central band with irregular borders, and several guanine spots on the sides ( Figs. 1, 3 ). Venter with a rectangular light brown mark, spinnerets brown ( Fig. 2 ). Epigynum square or slightly longer than wide, with thick transverse lip and wide median lobe ( Fig. 6 ); in posterior view, the sides of median plate are very convex ( Fig. 7 ); spermathecae spherical; fertilization ducts slightly curved and divergent, antero-dorsally directed ( Fig. 8 ); copulatory ducts in dorsal posterior position relative to spermathecae ( Fig. 9 ). Total length 7.74; carapace length 2.53, width 1.97; clypeus height 0.08; sternum length 1.17, width 0.97; abdomen length 5.45, width 2.43, height 2.60. Leg formula I/ IV/II/III. Leg lengths (I/II/III/IV): femur 2.73/2.33/1.67/2.83; patella 1.07/0.90/0.67/0.87; tibia 2.23/1.80/1.10/ 2.03; metatarsus 2.40/1.97/1.13/2.20; tarsus 1.10/0.93/0.78/0.98; total leg 9.53/7.93/5.35/8.91. Male. Unknown. Variation. Females vary in carapace length from 2.48 to 2.53 (n=4). Natural history. These spiders were collected in the understory, during night and day, in the dry season. Habitat is a warm, humid and seasonal forest; with pronounced rainfall between three to four months in rainy season (December–March). This area functions as biological corridor connecting the Manu National Park with the Tambopata National Reserve ( Rosenthal et al ., 2012 ). Distribution. Only known from the type locality (Cuenca Río Los Amigos, Madre de Dios, Peru ).