Pedrocortesella hangayi, Hunt, 1996

Hunt, Glenn S., 1996, A review of the genus Hexachaetoniella Paschoal in Australia (Acarina: Cryptostigmata: Pedrocortesellidae), Records of the Australian Museum 48 (3), pp. 223-286 : 256-258

Pedrocortesella hangayi n.sp.

Figs 24A,B,E , 25, 26

Type material. New South Wales: HOLOTYPE adult, AM KS43679 , Willandra Homestead via Hillston, 33°12'S 145°07'E, berlese extraction leaf litter near river, G. Hangay and T. Ra1ph, July 1992 . PARATYPE adults. AM KS46539 SEM stub no. S/134 (ill.), same data as holotype, 1 adult ; ANIC, 13 km S. of Collarenebri , 29°34'S 148°35'E, berlese extraction Geijera leaf litter, ANIC berlesate 88, L.A. Mound, 5 June 1968, 8 adults ; AM KS43680 , same data, 2 adults ; AM KS46540 , SEM stub no. S/248 (ill.), same data, 3 adults ; FMNH, same data, 2 adults ; CNC, same data, 2 adults .

Diagnosis. Body medium, length about 500-600 /lm; scalps rarely (if at all) carried by adult; sensillus with long flattened tuberculate blade; notogaster with caudal invagination when viewed dorsally, reticulate-alveolate around margins, more open alveolate-rugose pattern centrally; 5 pairs of notogastral setae arising from large pits, genitoanal chaetotaxy 7:1:2:3, genital setae in arcuate file, insertion of seta ad3 adjacent to posterior half of anal valve; claw stalk very short.

Description

ADULT: Body: dark brown; length 530 /lm, 560 /lm. Cerotegument: body generally with thin veneer of cerotegument; reticulations on prodorsum and notogaster and rim of bothridium highlighted with cushion-like masses or crests of cerotegument ( Fig. 25 E-G). Setae ro and le and notogastral setae with thick ribbed accretion of cerotegument near base. Legs with cerotegument capping surface sculpturing, setae with striking ribbed accretions. Prodorsum: integument reticulate-alveolate particularly anterior to median transverse groove, no carina between le and ro; le dorsolateral, distance between them about 0.65 distance between ro, arising from large pit, ro ventrolateral. Pedotectal tooth similar to P. propinqua . Bothridium abutting but not closely adpressed to notogaster ( Fig. 25F ), wall subcircular and depressed anterolaterally, posterolateral carina weak, situated close to notogaster; sensillus with long flattened tuberculate blade ( Fig. 25E ), length about 0.8 interbothridial distance; posterior margin of prodorsum forming a smooth arc between bothridia. in small, set close to base ofbothridial wall, at edge of dorsosejugal furrow, entirely encased in cerotegument ( Fig. 25F ). Exuvial scalps: none seen. Notogaster: oval, length:width 360:290, 380:295. Intramarginal depression U-shaped. Notogaster reticulatealveolate around margins but with more open alveolaterugose pattern centrally ( Fig. 25A ); posterior margin slightly invaginate when viewed from above, with a Vshaped carina between setae pi when viewed posteriorly ( Fig. 25D ). Fissura ia and im oblique and ip obliqueperpendicular to sagittal plane; pore to gla posterior to im; 5 pairs of moderately short notogastral setae arising from large pits ( Fig. 25D,H ); hi widely separated, each located just inside posterior margin; pi inserted midheight on posterior flank, further apart than hi; lpx, p2x and p3x arise just inside posterolateral flank, their insertions easily visible from above, lpx and p2x equidistant from fissura ip, lpx inserted posterior to it ( Fig. 25H ). Gnathosoma : cheliceral movable finger ventrolaterally with prominent shelf on antiaxial surface and larger but more flexible flap on paraxial surface. Rutella basally with strong concave flexure and moderate lateral buttressing, small pointed mesad processes present, transverse striations absent ( Fig. 26B ). Pedipalp tarsus with setae (vt), I" and cm with medium-short barbs, apophysis supporting seta aem short; solenidion omega almost reaching to base of aem. Epimeral region: strongly convex immediately anterior to genital valves, though not tending to overhang them. Genitoanal region: separation of anal and genital vestibules relatively broad but with interruption to ventral plate microsculpture, wide mesal isthmus without strong transverse grooves between the vestibules ( Fig. 26A ). Ventral plate reticulatealveolate. Genitoanal chaetotaxy 7:I:2:3; genital setae in arcuate file, g4 and g5 furthest away from margin, gi slightly longer than other setae, inserted close to inner anterior corner in marginal notch; g5 situated at about 0.5 valve length, g7 inserted well anterior to inner posterior corner in marginal notch; setae ag inserted at level posterior to g7; setae adi distinctly postanal, ad3 level with posterior half of anal valve; adi-3 inserted in large pits. Legs. Distal apophysis of tibia overlaps about 30% of tarsus ( Fig. 25A ). Tarsal cluster of leg I placed distodorsally on apophysis, almost directly above setae te; fi" with very thick base ribbed by cerotegument and together with omega 1 and 2 enclosed in common rim (partition separating fi" from omega 1 and 2 not seen); fi" longer than solenidia; tarsus lacking distal recess for receiving retracted unguinal complex, stalk very short.

Etymology. This species is named after George Hangay, a former colleague at the Australian Museum, who collected the holotype.

Distribution. Western New South Wales.

Figures

Fig . 24 . Pedrocortesella spp . , appendage structures . A , B , E : P hangayi n . sp . A , leg I tibia ( distal ) and tarsus , antiaxial ; B , detail of tarsal cluster ; E , pedipalp . C , D : P gunjina n . sp . C , leg I , tarsus ; D , detail of tarsal cluster ( damaged ) . Scale bars : A , C = 20 Ilm ; B , E = 10 Ilm ; D = 51 lm . A , E = Collarenabri ; B = Hillston ; C = Gunjin Gully .

Fig. 25. Pedrocortesella hangayi n.sp. A, body, dorsal; B, prodorsum, frontal; C, body, lateral; D, notogastral setae hI and pI, posterior view; E, bothridium, sensillus and seta in, dorsolateral; F, bothridium and seta in, dorsal; G, notogastral integument and fissura im; H, notogaster, posterior, dorsal, arrows right to left label setae hI, pI, alveolus of lpx (seta broken), alveolus of p2x, setae p3x. Scale bars: 䅾䌠 TODO = 100 /lm; D,E,H = 50 /lm; F,G 20 /lm.

Fig. 26. Pedrocortesella hangayi n.sp. A, body, ventral; B, part of gnathosoma: rutella, chelicerae with ventral paraxial and ventral antiaxial processes; C, subcapitulum; D, anal valves; E, genital valves. Scale bars: A = 100 J.!m; C-E = 50 J.!m; B 20 J.!m. A,B Hillston; C-E Collarenabri.