New species of Crotonia (Acari: Oribatida: Camisiidae) from Nothofagus and Eucalyptus forests in Victoria, Australia, with a redescription of the fossil species Crotonia ramus (Womersley, 1957) Author Colloff, Matthew J. Author Perdomo, Giselle text Zootaxa 2009 2217 1 36 journal article 10.5281/zenodo.189961 f4918554-8847-4b2e-89af-ea92badaad40 1175-5326 189961 Crotonia victoriae sp. nov. ( Figs. 3 , 15 , 17–19 ) Dimensions . Holotype female length 1430, breadth 735. Paratype females (n = 4) mean length 1487 (range 1446–1557 ); mean breadth 709 (632–766). Paratype male length 1193, breadth 615. Mean ratio of length of prodorsum to total length: 0.3. Female . Prodorsum : rostrum well-developed, with very prominent naso, lateral edges incurved; rostral setae ( ro ) 58, straight, spiniform, smooth ( Fig. 3 a). Lamellar setae ( le ) 320, recurved, smooth, flagelliform. Lamellar apophyses curved, 134, two-thirds as long as their mutual distance; extending anterior of apices of rostral setae. Interlamellar apophyses twice as long as broad; interlamellar setae ( in ) slender, 460, flagelliform, smooth; extending anterior of apices of arc of lamellar setae. Prodorsal ridges extending half the distance between interlamellar and lamellar apophyses. Diameter of each bothridium 58; anteriolateral auriculate ridge in the form of a blunt, indented projection, longer than broad, bearing a series of acute ridges of cuticle projecting anteriolaterally; bothridial membrane reticulate with sub-hexagonal cells medially; sensilla containing vesicular structures ( Fig. 17 f). Inter-bothridial ridge with straight, diagonal ridges laterally, then straight, transverse medial ridge with indentation posterior of median field of muscle sigilla. Prodorsum porose. Subcapitulum : with three setae on gena. Oral setae or 1 slender, bifurcate, barbed bilaterally; or 2 and or 3 spiniform, subequal, 24 ( Fig. 15 g). Notogaster : ratio of length to breadth 1.39; broadest at bases of setae e 2 ( Fig. 3 a). Dorsosejugal suture discrete, simple. With 14 pairs of notogastral setae. Pre-notogastral shield separated from notogastral shield by transverse hyaline strip and bearing thin setiform setae c 2, 194, and shorter c 1, 64. Apophyses of setae c 3 prominent, 60, almost three times as long as broad; setae c 3 flagelliform, 385, extending as far as bases of lamellar apophyses. Notogastral shield discrete, porose; bordered laterally by two narrow strips of small tubercles extending posteriorly almost as far as setae f 1. Sparsely tuberculate in caudal region. Lateral hyaline strip (suprapleural scissure) well developed, bearing tubercles of setae cp , e 2 and f 2.Tubercles of setae f 2 short, 32, but projecting beyond lateral margin. Setae e 2 154; cp 90; f 2 115, flagelliform. Setae d 2 thin, setiform, 42. Opisthosomal gland opening gla positioned at level slightly anterior of f 2. Flagelliform setae f 1 96, their apophyses projecting posteriolaterally, markedly separated from those of h 1. Setae h 2 118, spinose, smooth; their apophyses 180 long, parallel for most of their length, diverging apically, 1.2 x longer, than distance between them. Caudal margin between apophyses of h 2 transverse; apophyses of setae h 3 positioned ventral of smooth spinose h 1, 90. Apophyses of setae f 1 and h 1 35–40, cylindrical, subequal; those of h 3 30, cylindrical. Ve n te r : epimeres porose ( Fig. 3 b); epimeral setae smooth, spiniform, formula 3-1-3-3; setae 4a longer than others, 3c on well-developed tubercle. Genital plates sub-circular. Each plate 237 long, 147 broad with eight spiniform setae and a strongly-developed median carina. Two pairs of aggenital setae subequal in length to genital setae. Anal plate 64 broad, 358 long with three spiniform setae in central region; three pairs of spiniform adanal setae. Ventral margin of notogaster surrounding anal plates U-shaped with V-shaped posteriomedian notch. Tubercles of setae p 1 on short projecting ridge; same distance apart as their length ( Fig. 3 b). Lateral view : Caudal margin slightly sloping anterioventrally; perpendicular to notogastral shield ( Fig. 17 f); distance between dorsal and ventral surface ca. 535. Apophyses of setae f 1 and h 1 and h 2 pointing dorsolaterally, those of h 2 prominent, horizontal, pointing posteriorly; those of h 3 positioned on caudal margin at base of apophyses of setae h 2, pointing posteriorly. Apophyses of setae p 1 positioned on caudal region almost in transverse line with p 2, and p 3. Distance between apophyses of p 1 and h 3 258. Pleuraspis with scattered tubercles on dorsal half. FIGURE 3. Crotonia victoriae sp. nov . holotype female a) dorsal; b) ventral. Male . As for female, except 0.82 of the length and 0.85 of the breadth. Material Examined and Locality Data. Holotype female, two paratype females and one paratype male, sieved litter and wood, open Eucalyptus forest, on Acheron Way, 2 km south of junction with Marysville Rd., ca. 18 km north-east of Healesville, Victoria, 37°33'38"S 145°40'49"E , 440 m , coll. D. Black, 4.iii.1990 . Two paratype females, sieved rainforest litter and wood, coastal warm temperate rainforest, Double Creek Nature Walk, Croajingolong National Park, ca. 8 km NW. of Mallacoota, Victoria, 37°31'25"S 149°43'4"E , 45 m , coll. D. Black, 26.x.1990 . Holotype , one paratype female, one paratype male (CRO-006) deposited in Department of Entomology, Museum Victoria, Melbourne. Remaining paratypes in Australian National Insect Collection, CSIRO Entomology, Canberra. Etymology. The species is named for the State of Victoria. Remarks. The association of the male and the female of this species is based on the shared morphology of the bothridial auriculae, the caudal setae and their apophyses and the relative dimensions of setae of the c series, d 2, e 2 and p 1. Crotonia victoriae sp. nov. can be distinguished from other members of the genus by the following combination of characters: 1) with three pairs of c setae; 2) setae c 3 long, extending at least as far as bases of lamellar apophyses; 3) notogastral shield with narrow lateral strips of small tubercles, becoming diffuse medially of strips on posterior part of the plate and caudally, otherwise porose; 4) bothridia with narrow, curved anteriolateral auriculae with series of obtuse ridges and spurs; 5); setae c 1 about a third of the length of c 2 which are about half the length of c 3; 6) inter-bothridial ridge a flat, continuous shallow curve; 7) setae f 1 and h 1 spiniform; 8) setae p 1 flagelliform, almost as long as apophyses of setae h 2. Crotonia victoriae sp. nov. is a member of the Capistrata species-group ( Colloff, 2009b ) and is morphologically most similar to Crotonia alpina sp. nov. (see remarks section for this species above).