Escaphiella isabela, Platnick & Dupérré, 2009

Platnick, Norman I. & Dupérré, Nadine, 2009, The American Goblin Spiders Of The New Genus Escaphiella (Araneae, Oonopidae), Bulletin of the American Museum of Natural History 2009 (328), pp. 1-151 : 140-141

Escaphiella isabela , new species Figures 922–943 ; map 12

TYPES: Male holotype and female allotype screened from Pisonia litter in a community with Macraea , Croton , Opuntia , Tournefortia , and Chiococca , west of lava flow at an elevation of 360–380 m on Volcán Darwin, Isla Isabela, Galapagos Islands (May 25, 1980; W. Reeder), deposited in TMM (59889, 34307, PBI_OON 36406, 36405).

ETYMOLOGY: The specific name is a noun in apposition taken from the type locality.

DIAGNOSIS: This species can easily be separated from E. cristobal by the unpatterned abdomen (fig. 935), pale yellow color, and longer legs, by the smaller palpal femur and ventrally more invaginated palpal bulb of males (figs. 929–932), and by the more rounded epigynal atrium of females (fig. 940).

MALE (PBI_OON 36404): Total length 1.34 (figs. 922, 923, 926). Carapace pale orange, surface of elevated portion of pars cephalica granulate, sides granulate, carapace lightly granulated all over, smoothing when reaching elevated portion of pars cephalica; lateral margins with blunt denticles (figs. 924, 927). Eyes: ALE circular, PME squared; ALE separated by less than their radius, ALE-PLE separated by less than ALE radius, PME touching, PLE-PME touching (fig. 925). Sternum pale orange, without radial furrows between coxae I–II, II–III, III–IV, surface smooth, microsculpture absent (fig. 934). Chelicerae, endites, and labium pale orange. Abdomen ovoid; book lung covers large, ovoid; pedicel tube medium, scutum extending far dorsal of pedicel; dorsal scutum pale orange, covering more than 3/4 of abdomen, no soft tissue visible from above, middle surface finely reticulate, sides finely reticulate; epigastric scutum with anterior spiracles apparently connected by groove (figs. 928, 933); postepigastric scutum pale orange, sides striated. PMS present (compound microscope). Legs pale orange. Right and left palps symmetrical, proximal segments pale orange; embolus dark; femur normal size (figs. 929–932); cymbium and bulb pale orange.

FEMALE (PBI_OON 36405): Total length 1.60 (fig. 937, 941, 943). Abdomen with soft portions of dorsum white (fig. 935, 938, 939); sides of postepigastric scutum finely reticulate (fig. 936). Anterior epigynal sclerite abruptly widened at about half its length (figs. 940, 942).

OTHER MATERIAL EXAMINED: GALAPAGOS ISLANDS: Isla Isabela: Bursera Camp, Volcán Alcedo , May 19, 1980, small irregular webs, elev. 340 m (W. Reeder, TMM 61193, PBI_OON 36407), 18; E slope, Volcán Alcedo, May 25, 1980, from down wood ( Bursera , Psidium ) in gully with Bursera , Croton , Waltheria and some Pisonia , elev. 380 m (W. Reeder, TMM 57856, PBI_OON 36404), 18.

DISTRIBUTION: Known only from Isla Isabela, Galapagos Islands (map 12).

Figures

Figs. 922–928. Escaphiella isabela, new species, male. 922. Habitus, dorsal view. 923. Same, ventral view. 924. Carapace, dorsal view. 925. Habitus, anterior view. 926. Same, lateral view. 927. Carapace, lateral view. 928. Epigastric region, ventral view.

Figs. 929–934. Escaphiella isabela, new species, male. 929. Left palp, dorsal view. 930. Same, prolateral view. 931. Same, ventral view. 932. Same, retrolateral view. 933. Abdomen, ventral view. 934. Cephalothorax, ventral view.

Figs. 935–943. Escaphiella isabela, new species, female. 935. Habitus, dorsal view. 936. Same, ventral view. 937. Carapace, dorsal view. 938. Habitus, anterior view. 939. Same, lateral view. 940. Abdomen, ventral view. 941. Cephalothorax, ventral view. 942. Epigynum, ventral view. 943. Carapace, lateral view.