Ischnocolus ignoratus, Guadanucci & Wendt, 2013

Guadanucci, José Paulo Leite & Wendt, Ingo, 2013, Revision of the spider genus Ischnocolus Ausserer, 1871 (Mygalomorphae: Theraphosidae: Ischnocolinae), Journal of Natural History (J. Nat. Hist.) 48 (7 - 8), pp. 387-402 : 396-398

Ischnocolus ignoratus sp. nov.

( Figure 5 )

Type material

Holotype male ( NMW 21447) from Syria, 1896, Godl leg. Paratypes: 1f and 2m ( NMW 21448) from Jerusalem, Israel .

Etymology

From the Latin word “ignored”. The specimen here designated as holotype was found in the same jar of the female holotype of I. syriacus , but placed in a separate vial and with a different label. Ischnocolus syriacus has already been transferred by Guadanucci and Gallon (2008) to the genus Chaetopelma , under the synonym of C. olivaceum (C. L. Koch) . Ausserer (1871) did not mention this extra specimen, which we suspect was put in the jar subsequent to the description. Moreover, the collection date of this specimen, according to the label, is 1896, 25 years after the description of I. syriacus . The examination of this specimen revealed it to be a new species of Ischnocolus . Fortunately, an extra vial with two males and one female from the same locality was found in the Naturhistorisches Museum Wien arachnid collection, making it possible to establish the correspondence between both sexes.

Diagnosis

Male representatives can be distinguished from congeners by the morphology of the palpal bulb, which is slightly bent at the apical end ( Figure 5 ). Female representatives can be distinguished by the morphology of the spermatheca, which is composed of two twisted receptacula ( Figure 5C ).

Description

Male (NMW 21447). Total length 17.9. Carapace: length 7.2; width 5.8. Eye tubercle: length 0.9; width 1.1. Labium: length 0.8; width 1.3. Sternum: length 3.4; width 3.1. Cheliceral basal article with nine teeth. Labium twice as wide as long with 21 cuspules. Maxilla with more than 90 cuspules. Sternum oval, posterior sigilla marginal. Thoracic fovea straight. Palp: femur 3.7 / patella 2.5 / tibia 2.7 / cymbium 1.8 / total 10.7. Legs I: femur 5.5 / patella 3.8 / tibia 4 / metatarsus 3.8 / tarsus 2.6 / total 19.7. II: 5.2 / 3.3 / 3.6 / 3.7 / 2.7 / 18.5. III: 4.6 / 2.6 / 3 / 4.2 / 2.9 / 17.3. IV: 6.3 / 3.3 / 5 / 5.8 / 3.5 / 23.9. Spines: Tarsi without spines. Palp: femur (d) 0-0-2, patella (p) 1, tibia (p) 0-2-2. Legs: I: femur (d) 0-0-4, patella (p) 1, tibia (v) 2-3-ap1, (p) 0-7-0, (r) 0-1-0, metatarsus (v) 0-1-ap1, (p) 0-1-0. II: femur (d) 0-0-p3, patella (p) 1, tibia (v) 2-1-ap3, (p) 1-1-1, metatarsus (v) 0-1-ap1, (p) 2-1-0. III: femur (d) 0-0-2, patella (p) 2, tibia (v) 1-3-ap3, (p) 2-2-0, (r) 2-1-0, metatarsus (v) 4-3-ap3, (p) 2-1-1, (r) 0-1-1. IV: femur (d) 0-0-3, patella (p) 1, tibia (v) 2-4-ap3, (p) 1-1-0, (r) 4-4-2, metatarsus (v) 3-3-ap3, (p) 2-2-1, (r) 1-2-2. Scopula on metatarsi: I and II nearly totally occupied, III more than three-quarters occupied, IV three-quarters occupied. Scopula on tarsi: I–IV divided by a longitudinal band of setae. Tarsus IV cracked ( Figure 2G ). Eyes: anterior row slightly procurved, posterior slightly recurved, clypeus narrower than the diameter of anterior median eyes. Posterior lateral spinnerets three-segmented, apical article digitiform.

Female (NMW 21448). Total length 16.6. Carapace: length 6.1; width 4.8. Eye tubercle: length 0.8; width 0.9. Labium: length 0.6; width 1.1. Sternum: length 3; width 2.6. Cheliceral basal segment with nine teeth. Labium twice as wide as long with 23 cuspules. Maxillae with more than 70 cuspules. Sternum oval, sigilla marginal. Thoracic fovea straight. Palp: femur 2.9 / patella 2.1 / tibia 1.6 / tarsus 1.9 / total 8.5. Legs I: femur 3.9 / patella 2.8 / tibia 2.6 / metatarsus 2.1 / tarsus 1.7 / total 13.1. II: 3.7 / 2.5 / 2.2 / 2 / 1.7 / 12.1. III: 3.3 / 2 / 1.9 / 2.4 / 1.8 / 11.4. IV: 4.5 / 2.5 / 3.3 / 3.4 / 2.5 / 15.9. Spines: Tarsi without spines. Palp: femur (d) 0-0-p1, tibia (p) 0-1-0, (v) 0-2-ap3. Legs: I: femur (d) 0-0-p1, tibia (v) 1-1-0, metatarsus (v) 1-1-0. II: femur (d) 0-0-p1, tibia (v) 1-1-0, (p) 0-1-0, metatarsus (v) 0-1-ap1. III: femur (d) 0-0-p1, patella (p) 2, tibia (v) 2-2-ap2, (p) 1-1-0, (r) 1-1-0, metatarsus (v) 2-2-ap3, (p) 1-1-1, (r) 0-1-1. IV: femur (d) 0-0-r1, tibia (v) 2-2-ap2, (r) 0-1-2, metatarsus (v) 2-3-ap3, (p) 2-1-1, (r) 0-1- 1. Scopula on metatarsi: I totally occupied, II nearly totally occupied, III more than three-quarters occupied, IV more than half occupied. Superior tarsal claws without teeth. Eyes: anterior row slightly procurved, posterior recurved, clypeus narrower than the diameter of anterior median eyes. Posterior lateral spinnerets three-segmented, apical article digitiform.

Remarks

In the taxonomic revision of Guadanucci and Gallon (2008) of the genus Chaetopelma Ausserer the species Ischnocolus syriacus Ausserer and Ischnocolus jerusalemensis Smith were transferred to Chaetopelma under the synonymy of Chaetopelma olivaceum C. L. Koch.

Siliwal (2009) revised the Indian species of Ischnocolus and proposed the following changes: Ischnocolus khasiensis Tikader, 1977 transferred to the genus Chilobrachys as Chilobrachys khasiensis (Tikader, 1977) ; Ischnocolus decoratus Tikader, 1977 transferred to the genus Chilobrachys , under the synonymy of Chilobrachys fimbriatus Pocock, 1899 .

Figures

Figure 2. Ischnocolus valentinus. (A) Chelicerae, labium and maxillae, ventral view (arrows showing clear area of anterior edge of maxillae). (B) Left chelicera, prolateral view (arrow showing intumescense). (C) Palpal tibia, ventral view, showing sigmoid furrow. (D) Cymbium, ventral view, showing unequal lobes. (E) Tibia I, ventral view, showing concentration of spines. (F) Tarsal claws, ventral view, showing bipectinated claws. (G) Tarsus IV, dorsal view (arrow showing cracked region). Scales = 1 mm.

Figure 5. Ischnocolus ignoratus sp. nov. (A), (B) Holotype male, NMW 21447. (A) Palpal bulb, prolateral view. (B) Palpal bulb, retrolateral view. (C) Paratype female, NMW 21448, spermathecae, dorsal view. Scales = 1 mm.