Ideoblothrus aeoodi Harvey

Harvey, Mark S. & Edward, Karen L., 2007, A review of the pseudoscorpion genus Ideoblothrus (Pseudoscorpiones, Syarinidae) from western and northern Australia, Journal of Natural History 41 (5 - 8), pp. 445-472 : 450-452

Ideoblothrus aeoodi Harvey

( Figures 5, 6 )

Ideoblothrus aeoodi Harvey 1991b, p 497 –498, Figures 27–33 , 40–41 ; Harvey et al. 1993, p 131, 134.

Material examined

Holotype: „, Australia: Western Australia: Cave C-167, Cape Range peninsula, 22 ° 099090S, 113 ° 599390E, 20 June 1989, under stone in dark zone, M. S. Harvey

( WAM 91/286). Paratype: Australia: Western Australia : 1♀, collected with holotype ( WAM 91 /287) .

Other material. Australia: Western Australia: one deutonymph, Cave C-167, Cape Range peninsula, 22 ° 099090S, 113 ° 599390E, 21 July 1991, R . D. Brooks ( WAM T 71323); one protonymph, Cave C-167, Cape Range peninsula, 22 ° 099’090S, 113 ° 599390E, 30 July 1991, R . D. Brooks ( WAM T 23723) .

Description

Deutonymph. Colour: generally pale, pedipalps pale yellow orange.

Chelicera: with five setae on hand, all setae acuminate; movable finger with one subdistal seta; flagellum of five blades, distal blade broadened and finely denticulate; serrula exterior with ca 17 blades.

Pedipalp: trochanter 1.57, femur 2.77, patella 2.31, chela (with pedicel) 3.21, chela (without pedicel) 3.03, hand 1.49 times longer than broad, movable finger 1.11 times longer than hand. Fixed chelal finger with six trichobothria, movable chelal finger with two trichobothria ( Figure 5 ): esb, isb, sb, and st absent; eb situated at base of fixed finger; ib situated on dorso-distal surface of hand; ist and est situated close together; it situated distally to est and ist; et situated sub-distally; b situated sub-basally; t situated sub-medially; t slightly shortened, lanceolate, and bent backward. Venom apparatus only present in fixed chelal finger. Chelal teeth: fixed finger with 22 slightly retrorse teeth, tooth row ending just distal to it; movable finger with 32 rounded teeth, tooth row extending midway between t and b.

Cephalothorax: carapace 1.11 times longer than broad; without eyes; with 20 setae, arranged 4: 4: 4: 4: 4.

Abdomen: pleural membrane granulo-striate near cephalothorax, remainder longitudinally striate, without setae. Tergites and sternites undivided.

Dimensions (mm) of deutonymph WAM T 71323: body length 1.184. Carapace 0.354 / 0.320. Chelicera 0.192 / 0.090, movable finger 0.138. Pedipalps: trochanter 0.141 / 0.090, femur 0.282 / 0.102, patella 0.275 / 0.119, chela (with pedicel) 0.481 / 0.150, chela (without pedicel) 0.454, hand length 0.224, movable finger length 0.249 .

Protonymph. Colour: generally pale, pedipalps very pale yellow.

Chelicera: with four setae on hand, all setae acuminate; movable finger without subdistal seta; flagellum not visible in preparation; serrula exterior with ca 14 blades.

Pedipalp: trochanter 1.35, femur 2.45, patella 2.17, chela (with pedicel) 3.35, chela (without pedicel) 3.17, hand 1.53 times longer than broad, movable finger 1.13 times longer than hand. Fixed chelal finger with three trichobothria, movable chelal finger with one trichobothrium ( Figure 6 ): isb, esb, sb, st, est, ist, b, and it absent; eb situated at base of fixed finger; ib situated on dorso-distal surface of hand; et situated sub-distally; t situated medially on movable finger; t bent backwards, but not lanceolate. Venom apparatus only present in fixed chelal finger. Chelal teeth: fixed finger with 12 slightly retrorse teeth, tooth row ending distally to et; movable finger with 22 rounded teeth, tooth row extending to t.

Cephalothorax: carapace 1.26 times longer than broad; without eyes; with 16 setae, arranged 4:4:4:2:2.

Abdomen: pleural membrane granulo-striate near cephalothorax, remainder longitudinally striate, without setae. Tergites and sternites undivided.

Dimensions (mm) of protonymph WAM T 23723: body length 1.168. Carapace 0.299 / 0.237. Chelicera 0.147 / 0.075, movable finger 0.106. Pedipalps: trochanter 0.112 / 0.083, femur 0.189 / 0.077, patella 0.195 / 0.090, chela (with pedicel) 0.378 / 0.113, chela (without pedicel) 0.358, hand length 0.173, movable finger length 0.195 .

Remarks

This species is known only from Cave C-167 situated on Cape Range peninsula. Due to a typographical error, Harvey (1991b) incorrectly reported that the width of the chela in the male of I. aeoodi is 0.21 mm; the correct width is 0.27 mm.

Very few protonymphs of the family Syarinidae have been described. The protonymphs of Ideobisum caecum Mahnert, 1979 (now Ideoblothrus caecus ) from Brazil ( Mahnert 1979) and Anysrius chamberlini Harvey, 1998 from Tasmania ( Harvey 1998) were described and the trichobothrial pattern illustrated, but neither recorded or illustrated the morphology of trichobothrium t. Mahnert (1985b) illustrated the trichobothrial pattern of Microblothrus tridens Mahnert, 1985 from Brazil and showed that trichobothrium t is distinctly lanceolate. The protonymph of I. aeoodi has an acuminate trichobothrium t, quite unlike the morphology of the deutonymph and adults. Whether this pattern is more widespread throughout the family remains to be seen through the examination of more protonymphs.

Figures

Figures 5–7. Ideoblothrus spp., left chelae, lateral. (5) I. aeoodi Harvey, deutonymph from Cave C-167 (WAM T71323). (6) I. aeoodi Harvey, protonymph from Cave C-167 (WAM T23723). (7) I. sp. ‘‘Mesa A’’, deutonymph from Mesa A, Western Australia (WAM T66073). Scale bars: 0.2 mm.

Figures 22–28. Ideoblothrus nesotymbus sp. nov., holotype „ unless otherwise stated. (22) Carapace, paratype ♀ (WAM T66019). (23) Right pedipalp, dorsal. (24) Left chela, lateral. (25) Detail of left fixed chelal finger, lateral. (26) Detail of left movable chelal finger, lateral. (27) Coxal region, ventral, paratype ♀ (WAM T66019). (28) Female genitalia, paratype ♀ (WAM T75213). Scale bars: 0.2 mm (22, 24); 0.5 mm (23, 27); 0.1 mm (25, 26, 28).

Figures 29–35. Ideoblothrus aeesti sp. nov., holotype ♀. (29) Carapace. (30) Right pedipalp, dorsal. (31) Left chela, lateral. (32) Left chelicera, dorsal. (33) Leg I. (34) Leg IV. (35) Coxal region, ventral. Scale bars: 0.2 mm (29–31, 35); 0.1 mm (32–34).

Figures 36–41. Ideoblothrus descartes sp. nov., holotype „ unless otherwise stated. (36) Carapace. (37) Left pedipalp, dorsal. (38) Right chela, lateral. (39) Detail of fixed chelal finger, lateral. (40) Detail of movable chelal finger, lateral. (41) Coxal region, ventral, paratype „ (WAM T70787). Scale bars: 0.2 mm (36–38, 41); 0.1 mm (39, 40).