Avicularia lynnae, Fukushima, Caroline Sayuri & Bertani, Rogerio, 2017

Fukushima, Caroline Sayuri & Bertani, Rogerio, 2017, Taxonomic revision and cladistic analysis of Avicularia Lamarck, 1818 (Araneae, Theraphosidae, Aviculariinae) with description of three new aviculariine genera 01, ZooKeys 659, pp. 1-185 : 70-72

Avicularia lynnae sp. n. Figs 19, 90, 201-208, 209

Diagnosis.

Males of Avicularia lynnae sp. n. resemble those of Avicularia minatrix , Avicularia hirschii and Avicularia caei sp. n. by tibia I with discrete elevation covered by a cluster of setae in apical portion, on prolateral side (Fig. 207). They can be distinguished from all species except Avicularia caei sp. n. by very long embolus, more than 4 times tegulum’s width in retrolateral view (Fig. 202). Males of Avicularia lynnae sp. n. differ from male Avicularia caei sp. n. by having developed prominence on tegulum (Fig. 203) and by abdomen dorsum with single central longitudinal dark stripe (Fig. 209). Female unknown.

Etymology.

It was named after Lynn West, wife of mygalomorph expert Rick West. This name is considered feminine in gender.

Material examined.

Holotype male, Peru, Loreto, Rio Tigre, Cristo Rey village [3°58'S, 74°16'W] near Iquitos, R. C. West col., 21 November 1993, crossing trail by day (AMNH RW49); paratype male, Peru, Loreto, Brillo Nuevo [3°09'S, 71°46'W] (Brillo Neuvo [sic]), Rio Yaguasyacu, B. Lamar col. ( AMNH–RCW).

Additional material.

ECUADOR: Pastaza: Tigüino [1°10'S, 76°57'W], 1 male, B. Lamar col., September 1990, found in a bird capture net ( AMNH–RCW); PERU: Marañón (Marauon [sic] [river or province?]), 1 male, Bristol, October 1927 (AMNH Pe96); Madre de Dios: Zona Reservada Pakitza [11°56'S, 71°17'W], 356 m asl, 1 male, Igidio & D. Silva col., 13 August 1992 (MUSM-ENTO 500685).

Male.

Description.AMNH RW49. Carapace: 10.87 long, 10.25 wide, 2.40 high. Chelicera: 3.07 long. Legs (femur, patella, tibia, metatarsus, tarsus, total): I: 11.9, 5.4, 9.2, 9.3, 5.0, 40.8. II: 11.1, 5.2, 8.9, 8.6, 4.7, 38.5. III: 10.0, 4.6, 8.0, 8.6, 4.6, 35.8. IV: 12.2, 4.9, 10.6, 12.6, 4.0, 44.3; Palp: 6.8, 3.7, 5.5, -, 2.1, 18.1; Midwidths: femora I–IV = 1.18, 1.7, 2.14, 1.9, palp= 1.6; patellae I–IV = 1.9, 2.2, 2.0, 2.1, palp= 1.8; tibiae I–IV = 1.7, 1.6, 1.4, 1.5, palp= 1.4; metatarsi I–IV = 1.1, 1.2, 1.1, 1.2; tarsi I–IV = 1.2, 1.3, 1.4, 1.2, palp= 1.3. Abdomen: 10.77 long, 8.49 wide. Spinnerets: PMS, 1.05 long, 0.46 wide, 0.13 apart; PLS, 1.50 basal, 0.85 middle, 2.17 distal; midwidths 0.96, 0.76, 0.68, respectively.

Carapace: 1.06 times longer than wide; cephalic region not raised, thoracic striae inconspicuous.

Fovea: shallow, straight, 0.64 wide.

Eyes: eye tubercle 0.91 high, 1.80 long, 2.41 wide. Clypeus absent. Anterior row of eyes slightly procurve, posterior slightly recurve. Eye size and interdistances: AME 0.62, ALE 0.61, PME 0.19, PLE 0.55, AME–AME 0.41, AME–ALE 0.27, AME–PME 0.14, ALE–ALE 1.54, ALE–PME 0.39, PME–PME 1.50, PME–PLE 0.04, PLE–PLE 1.96, ALE–PLE 0.19, AME–PLE 0.34.

Maxilla: length to width: 2.57. Cuspules: about 85 spread over ventral inner heel. Labium: 1.08 long, 1.72 wide, with 54 cuspules spaced by more than one diameter from each other, on anterior half. Labio-sternal groove shallow, flat, two slightly separate, large sigilla.

Chelicera: basal segment with 12 teeth and some small teeth on promargin. Sternum: 6.0 long, 3.91 wide. Sigilla: three pairs, anterior rounded, middle fusiform, posterior rounded, set at 45°angle, all close to margin.

Legs: Formula: IV=I II III. Length leg IV to leg I: 1.09. Clavate trichobothria: distal 2/3 tarsi I–IV. Scopula: Tarsi I–IV fully scopulate. Metatarsi I–II fully scopulate; III 1/2, IV 1/5 distal scopulate. IV divided by a bald area.

Type II urticating setae: 0.73-0.87 long, 0.013-0.019 wide.

Palp (Figs 201-204): globous bulb with small subtegulum and developed prominence on tegulum. Embolus: not flattened, lacking keels, 3.91 long in retrolateral view, about 4.5 times tegulum’s length. Medial portion and tegulum’s margin form an acute angle in retrolateral view. Proximal part very curved in frontal view; thin distal width, tapering distally; basal, middle and distal width of 0.26, 0.18, 0.03, respectively. Tegulum: 1.51 long, 0.89 high in retrolateral view. Cymbium subtriangular with subequal lobes, with well-developed process bearing thin setae on retrolateral lobe (Fig. 205).

Tibial I with a discrete elevation covered by a cluster of setae in apical portion, on prolateral side (Figs 206-208).

Color pattern (Fig. 209): carapace brown with golden short body setae and thick dark longer setae spread over the carapace. Carapace border long setae the same color as dorsal carapace short body setae. Coxae, labium, sternum and maxillae light brown, same color as ventral femora. Legs and palps with brown short body setae and orange brown long guard-setae. Leg rings on distal femora, tibiae and metatarsi whitish. Abdomen dorsum with long guard-setae homogeneously distributed, lateral orange short body setae and black short body setae forming a central longitudinal stripe. Ventral abdomen light brown.

Color pattern ontogeny.

Immatures are unknown.

Distribution.

Ecuador and Peru (Fig. 90).

Natural history.

Specimens were found in a silken retreat in a curled living leaf (W. Lamar, pers. comm. to R. C. West).

Female unknown.

Remarks.

Aviculariinae diversity in Ecuador, Peru and Colombia is poorly known, and certainly underestimated; specimens are rare in arachnological collections. Thus, the identity of some specimens collected in these countries should be analyzed carefully. Avicularia lynnae sp. n. specimens were collected in Peru and Ecuador, and its female is unknown. The species is sympatric with Avicularia hirschii and resembles it by having tibia I with discrete elevation covered by a cluster of setae in apical portion on prolateral side, and by having cymbium with thin setae covering the process on retrolateral lobe. The difference lies in embolus length, much greater in Avicularia lynnae sp. n. (Fig. 204) than in Avicularia hirschii (Fig. 176). Pairing female and immature to males of each one of these sympatric species is a problem. Paratype female of Avicularia hirschii has very long twisted spermatheca, which is morphologically more compatible with the very long embolus of males of Avicularia lynnae sp. n. Immatures of Avicularia hirschii were described as having single dorsal black stripe on abdomen (Fig. 184). However, this immature pattern could fit to adults of either Avicularia hirschii and Avicularia lynnae sp. n. Thus, it is necessary to further collect specimens to solve this query.