Niarchos scutatus, Platnick & Duperre, 2010

Platnick, Norman I. & Dupérré, Nadine, 2010, The Andean Goblin Spiders Of The New Genera Niarchos And Scaphios (Araneae, Oonopidae), Bulletin of the American Museum of Natural History 2010 (345), pp. 1-120 : 35-45

Niarchos scutatus , new species Figures 226–311

TYPES: Male holotype and female paratype taken from litter along stream trail at an elevation of 2130 m at the Yanayacu Biological Station , 0u 35.9559S, 77u 53.4319W, Napo, Ecuador (Nov. 25, 2009; Niarchos Exped. ), deposited in QCAZ (PBI_OON 409) .

ETYMOLOGY: The specific name is Latin, meaning ‘‘armed with a shield,’’ referring to the dorsal abdominal scutum found in males (but not females).

DIAGNOSIS: Males resemble those of N. ramirezi and its relatives, but have a thicker embolar base (figs. 234–238); females resemble those of N. ramirezi and N. bonaldoi in having a thumblike anterior process on the anterior receptaculum, but have a thick transverse sclerite connecting distally narrower apodemes (figs. 310, 311).

MALE (PBI_OON 407, figs. 226–272): Total length 1.41. Posterior eye row straight from above. Sternum surface smooth. Endites with anterior projection triangular, laterally directed. Leg spination: tibiae IV v0-0-2. Embolus on wide base about half as long as rest of bulb, tip bent at right angle (figs. 234–238).

FEMALE (PBI_OON 407, figs. 273–311): Total length 1.76. Leg spination: tibiae IV v0- 0-2. Epigastric scutum with posterior margin only slightly invaginated at middle, postepigastric scutum short, occupying only about half of space between epigastric furrow and posterior spiracles (figs. 310, 311).

OTHER MATERIAL EXAMINED: Ecuador: Napo: Yanayacu Biological Station, trail to San Jorge de Yanayacu Wildlife Refuge, 0.58813uS, 77.88428uW, Nov. 26, 2009, elev. 2140 m ( Niarchos Exped., AMNH PBI _OON 40819), 1 U, same, Nov. 30, 2009 ( Niarchos Exped., MACN PBI _OON 40820), 1 U, same, Nov. 25–30, 2009 (MACN PBI_OON 439). 1 -; Yanayacu Biological Station, stream trail, 0u 35.9559S, 77u 53.4319W, Nov. 25, 2009, from epiphytes, elev. 2130 m ( Niarchos Exped., AMNH, MACN, QCAZ PBI 407), 3 -, 3 U (including 1 - P. Michalik voucher EC-004).

DISTRIBUTION: Known only from the Yanayacu Biological Station in Napo province, Ecuador.

Figures

Figs. 226–238. Niarchos scutatus, new species, male. 226. Habitus, dorsal view. 227. Same, ventral view. 228. Same, lateral view. 229. Carapace, dorsal view. 230. Habitus, anterior view. 231. Carapace, lateral view. 232. Epigastric region, ventral view. 233. Sternum and mouthparts, ventral view. 234. Embolus, posterior view. 235. Same, prolateral view. 236. Palp, prolateral view. 237. Same, ventral view. 238. Same, retrolateral view.

Figs. 239–246. Niarchos scutatus, new species, male. 239. Habitus, dorsal view. 240. Same, lateral view. 241. Same, anterior view. 242. Carapace, dorsal view. 243. Same, lateral view. 244. Chelicerae, anterior view. 245. Same, posterior view. 246. Sternum, ventral view.

Figs. 247–254. Niarchos scutatus, new species, male. 247. Labium and endites, ventral view. 248. Labrum and endites, dorsal view. 249. Serrula, dorsal view. 250. Tarsal organ, leg I, dorsal view. 251. Same, leg II. 252. Same, leg III. 253. Same, leg IV. 254. Same, palp.

Figs. 255–262. Niarchos scutatus, new species, male. 255. Claws, leg I, distal view. 256. Same, leg II. 257. Same, leg III. 258. Same, leg IV. 259. Distal portion of tibia III, lateral view. 260. Same, metatarsus III. 261. Dorsal scutum, dorsal view. 262. Sperm pore, ventral view.

Figs. 263–270. Niarchos scutatus, new species, male. 263. Spinnerets, distal view. 264. Anterior lateral spinneret, same. 265. Posterior median spinneret, same. 266. Posterior lateral spinneret, same. 267. Palpal femur, dorsal view. 268. Palpal tibia, dorsal view. 269. Palp, prolateral view. 270. Palp, retrolateral view.

Figs. 271–278. Niarchos scutatus, new species. 271. Male palpal bulb, prolateral view. 272. Male embolus, ventral view. 273. Female habitus, dorsal view. 274. Same, anterior view. 275. Female carapace, dorsal view. 276. Same, lateral view. 277. Female chelicerae, anterior view. 278. Same, posterior view.

Figs. 279–286. Niarchos scutatus, new species, female. 279. Labium and endites, ventral view. 280. Labrum and endites, dorsal view. 281. Serrula, dorsal view. 282. Sternum, ventral view. 283. Claws of leg I, distal view. 284. Same, leg II. 285. Claws of leg III, lateral view. 286. Same, leg IV.

Figs. 287–294. Niarchos scutatus, new species, female. 287. Tarsal organ, leg I, dorsal view. 288. Same, leg II. 289. Same, leg III. 290. Same, leg IV. 291. Same, palp. 292. Trichobothrial base, metatarsus I, dorsal view. 293. Genitalia, dorsal view. 294. Same, anterior view.

Figs. 295–301. Niarchos scutatus, new species, female. 295. Spinnerets, distal view. 296. Anterior lateral spinneret, same. 297. Posterior median spinneret, same. 298. Posterior lateral spinneret, same. 299. Palp, prolateral view. 300. Same, retrolateral view. 301. Palpal tibia, dorsal view.

Figs. 302–311. Niarchos scutatus, new species, female. 302. Habitus, dorsal view. 303. Same, ventral view. 304. Carapace, dorsal view. 305. Sternum and mouthparts, ventral view. 306. Habitus, lateral view. 307. Same, anterior view. 308. Carapace, lateral view. 309. Epigastric region, ventral view. 310. Genitalia, ventral view. 311. Same, dorsal view.