Avicularia caei sp. n.

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 : 72-73

Avicularia caei sp. n. Figs 19, 90, 210-217, 218, 313

Diagnosis.

Males of Avicularia caei sp. n. resemble those of Avicularia minatrix , Avicularia hirschii and Avicularia lynnae sp. n. by tibia I with discrete elevation covered by a cluster of setae in apical portion, on prolateral side (Fig. 216). They can be distinguished from all species except Avicularia lynnae sp. n. by very long embolus, more than 4 times tegulum’s width in retrolateral view (Fig. 211). Males of Avicularia caei sp. n. can be distinguished from males of Avicularia lynnae sp. n. by weakly-developed prominence on tegulum (Fig. 212) and abdomen with lateral dark stripes (Fig. 218). Female is unknown.

Etymology.

This species is named after Carlos Eduardo Gurgel Paiola, aka Caê, in honor to his continuous support to one of the authors (CSF). This name is masculine in gender.

Material examined.

Holotype male, Brazil, Pará, Juruti, Acampamento Mutum (01°36'44.7"S, 56°11'39.2"W), L. T. Miglio col., 08 August 2008, ref. JURU 009 0043 (MPEG 15637).

Male.

Description.

MPEG 15637. Carapace: 10.44 long, 9.96 wide, 3.08 high. Chelicera: 3.45 long. Legs (femur, patella, tibia, metatarsus, tarsus, total): I: 11.01, 5.79, 8.44, 8.21, 4.47, 37.92. II: 10.37, 5.18, 8.05, 8.30, 4.35, 36.25. III: 9.19, 4.34, 7.17, 7.92, 4.02, 32.64. IV: 10.85, 5.26, 10.26, 10.66, 4.59, 41.62. Palp: 6.39, 3.96, 5.29, -, 2.62, 18.26. Midwidths: femora I–IV = 2.08, 2.08, 2.44, 1.89, palp= 1.44; patellae I–IV = 1.98, 2.10, 2.17, 1.90, palp= 1.48; tibiae I–IV = 1.25, 1.50, 1.47, 1.45, palp= 1.57; metatarsi I–IV = 1.10, 1.46, 1.02, 1.01; tarsi I–IV = 1.15, 1.37, 1.33, 1.15, palp= 1.64. Abdomen: 12.51 long, 7.59 wide. Spinnerets: PMS, 1.32 long, 0.63 wide, 0.19 apart; PLS, 2.31 basal, 1.16 middle, 2.04 distal; midwidths 1.17, 0.93, 0.76, respectively.

Carapace: 1.05 times longer than wide; cephalic region not raised, thoracic striae inconspicuous.

Fovea: shallow, recurve, 1.14 wide.

Eyes: eye tubercle 0.76 high, 1.72 long, 2.16 wide. Clypeus absent. Anterior row of eyes procurve, posterior slightly recurve. Eye size and interdistances: AME 0.50, ALE 0.57, PME 0.20, PLE 0.49, AME–AME 0.37, AME–ALE 0.20, AME–PME 0.07, ALE–ALE 1.41, ALE–PME 0.34, PME–PME 1.35, PME–PLE 0.02, PLE–PLE 1.70, ALE–PLE 0.29, AME–PLE 0.28.

Maxilla: length to width: 2.14. Cuspules: about 101 spread over ventral inner heel. Labium: 1.23 long, 1.65 wide, with 64 cuspules spaced by one diameter from each other on anterior half. Labium sternal groove shallow, flat, with two slightly separate, slim sigilla.

Chelicera: basal segment with 9 teeth and some small teeth on promargin. Sternum: 5.57 long, 4.49 wide. Sigilla: only posterior pair evident, oval, set at 45°angle, one diameter from margin.

Legs: Formula: IV=I II III. Length leg IV to leg I: 1.10. Clavate trichobothria: distal 1/2 tarsi I–II; 2/3 tarsus III, 1/2 tarsus IV. Scopula: Tarsi I–IV fully scopulate, IV with few sparse setae. Metatarsi I–II scopulate in distal 3/4; III 1/2; IV 1/4 distal scopulate. IV divided by row of setae.

Type II urticating setae: 0.99-1.05 long, 0.018-0.024 wide.

Palp (Figs 210-213, 313): globous bulb with small subtegulum and weakly-developed prominence on tegulum. Embolus: not flattened, lacking keels, 3.78 long in retrolateral view, about 4 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 0.28, 0.15, 0.03, respectively. Tegulum: 1.62 long, 0.96 high in retrolateral view. Cymbium subtriangular with subequal lobes having well-developed rounded process bearing thin setae on retrolateral lobe (Fig. 214).

Tibia I with discrete elevation covered by cluster of setae in apical portion, on prolateral side (Figs 215-217).

Color pattern (Fig. 218): carapace orange with golden brown short body setae, thick longer setae spread over the carapace. Carapace border with 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 dark brown long guard-setae. Leg rings on distal femora, tibiae and metatarsi whitish. Abdomen dorsum with light brown guard-setae, light brown short body setae forming lateral stripes, and black short body setae forming a dark background. Ventral abdomen dark brown.

Female is unknown.

Color pattern ontogeny.

Immatures are unknown.

Distribution.

Brazil, known only from type locality (Fig. 90).

Natural history.

Unknown. A single specimen was found walking on forest ground (L. Miglio, pers. comm.).