Oribatid mites (Acarina, Oribatida) from French Guyana II. Two new species from superfamily Crotonioidea Thorell, 1876 Author Miko, Ladislav Charles University Prague, Institute for Environmental Studies, Czech Republic. text Acarologia 2019 2019-08-09 59 3 348 363 http://dx.doi.org/10.24349/acarologia/20194336 journal article 10.24349/acarologia/20194336 2107-7207 5173683 8100ECA7-4A71-46A4-94AE-1A5E812B3C3B Malaconothrus kawensis n. sp. Zoobank: F2AA5098-43CB-48EF-ADD7-DFBAD9A80483 Figures 1 , 2 Diagnosis — Malaconothrus species from “plumosus” group (Colloff, 2013), with most of notogastral setae slightly dilated and bilaterally barbed, and some notogastral setae e 2 , ( h 1 , h 2 , p 2 ) smooth, setae h 2 being the longest. Centrodorsal setae of notogaster d 1 reaching significantly behind half distance of d 1 and e 1 . Prodorsal setae, particularly in , quite short, smooth, with only rostral setae densely bilaterally barbed. Epimeral setae 4b longest of epimeral setae IV and not positioned on posterior tectum of epimere IV. Dotted/porose areas present parallel to insertions of centrodorsal setae, also along lateral margins of notogaster and parallel to lateral edges of anogenital plate. Material examined — 5 females collected 10-III- 2012 in Kaw Mountains, in litter, dead leaves and rotting timber on the soil surface in tropical rainforest near to Coq du Roche Reserve, 4°34’2” N , 52°11’58” W (sample nr. LM-2012-008), French Guyana . Type and one paratype preserved in acarological collection of Senckenberg Museum in Goerlitz, 3 paratypes (one damaged) in collection of the author. Figure 1 Malaconothrus kawensis n. sp. , adult female: A – dorsal view, B – ventral view (legs not depicted). Abbreviations and descriptions: 1a-1c, 2a, 3a-3c, 4a-4c – epimeral setae; ad 1 – adanal seta 1; c 1 -c 3 , cp , d 1 -d 2 , e 1 -e 2 , f 2 , h 1 -h 3 , p 1 -p 3 – notogastral setae; ex 1 – exobothridial seta Figure 2 Malaconothrus kawensis n. sp. , adult female: A – prodorsal seta ro in dorsal and lateral view, seta le in dorsal and lateral view, complex of setae in-ex ; B – lateral view on posterior part of the body; C – notogastral setae d 1 , f 2 and e 2 in dorsal view; D – leg I in antiaxial view with description of setae, E – leg IV in antiaxial view with description of setae. Size of structures given in text. Abbreviations and descriptions: ad 1 -ad 3 – adanal setae 1-3; d 2 , e 1 -e 2 , f 2 , h 1 -h 3 , p 1 -p 3 – notogastral setae; ex 1 – exobothridial seta 1; in – interlamellar seta; le – lamellar seta; ro – rostral seta. of setae e 1 and f 1 , axially to lateral setae (from c 2 to the level of h 1 insertion). Irregular areas also present along notogastral posterior ridges, and V-shaped areas present behind insertions of setae c 1 . Similar, longitudinal areas present on ventral side, laterally along anogenital plate. Genital plates with more or less distinct, rugose surface sculpture. Prodorsum – ( Figs 1A , 2A ). Rostrum conical, with very blunt tip or almost rounded. Short rostral carinae ( roc ) present, running posteriad from ro insertions, their anterior ends connected with distinct transversal line; this structure giving rostrum angular appearance in slightly posterodorsal view. Lateral carinae ( lac ) poorly developed, visible only in proximal part, not reaching insertions of setae le . Posterior of prodorsum behind insertions of setae in and ex narrowed, creating elbow-like postbothridial carinae. Indistinct transverse line visible between insertions of in , probably representing slightly thickened cuticle on anterior edge of deepened posterior part of prodorsum. Rostral setae ( ro ) medium long (31–39), slightly thickened at base, distinctly barbed. Lamellar setae le ) of about the same length as ro (32–39), simple setiform, smooth. Interlamellar setae ( in ) largest of prodorsal setae (47–50), smooth, setiform. Setae ex 1 short, between one quarter and one third of in length (14–15), smooth, setiform. Setae ex 2 absent. Notogaster – ( Figs 1A , 2B, 2C ). Anterior margin straight, posterior margin slightly angulate in area of p 1 insertions. Notogaster slightly dilated posteriad, broadest part is at level of setae f 2 . Notogastral ridges present, well visible only in posterior part as inverted “W” with anterior ridges reaching more or less posterior to e 1 insertions. Distinct transverse ridge present between insertions of setae p 1 in posterior part of notogaster. Setae c 2 inserted on blunt tubercular thickening of cuticle. Notogastral setae of different length and form, d 1 , e 1 and h 2 longest (42–49), c 2 , c 3 , e 2 , h 1 , h 3 , p 1 and p 3 shortest (24–28). All notogastral setae barbed, most of them slightly thickened and with distinct barbs longer than width of setae, only e 1 , h 1 , p 2 and h 2 appearing almost smooth, but in detailed view each with at least few minute barbs. All lyrifissures distinct. Ventral characters – ( Fig. 1B ). Gnathosoma as in other species in genus ( Colloff and Cameron, 2013), setae a , m and h short, simple setiform. Epimeral region with distinct apodemes, epimeres IV with blunt posterior tectum projecting posteriad over anterior part of anogenital plate. Epimeral setal formula 3-1-3-3, epimeral setae mostly simple setiform and smooth (with only few minute barbs at most), except setae 3b and 3c which are distinctly barbed. Length of epimeral setae very different, 1a, 1c, 2a and 3a minute or vestigial, 4a and 4c short (around 7–8) and 1b, 3b, 3c and 4b somewhat longer (13–18). Anogenital plate with more or less parallel sides, length of genital plates 70, width 29, anal and adanal plates slightly longer (83), maximum width of anal plates 8, adanal 31. Five pairs of smooth genital setae present, with growing size from anterior to posterior, g 1 (10) more than 2 times shorter than g 5 (23). Alveoli of single pair of anal setae indistinct. Three pairs of quite long (38–44) adanal setae present, ad 1 distinctly barbed, ad 2 almost smooth or with some barbs, ad 3 setiform and smooth. Adanal lyrifissures large, distinct, mostly transversal, located anteriorly to ad 3 . Lyrifissures ips quite large, positioned near lateral edge of anogenital plate at level of anterior margin of anal plates. Legs – ( Figs 2D, 2E ). Robust and rather short, as typical for genus, with smooth claws. Setae differently shaped, mostly (except tarsi) setifom or slightly thickened and barbed, on tarsi some setae strong, spiniform, with blunt or pointed and curved tip. Trochanteral setal formula 0-0-2-1, setae of trochanter III barbed. Only leg I and IV studied in detail, setal formula of leg I 0-4-3[1]-4(1)-11, setal formula of leg IV 1-3-2-2-10. Setae d of femur, genu and tibia I and IV, lateral setae of genu I as well as setae l’ and v” of femur I barbed similar to notogastral setae. Setae tc of tarsus on both leg I and IV long (44–46), filiform, tactile. Setae u , pv and ft’ of leg I and p , u , s and pv of leg IV thick, spiniform, rather short and more or less blunt, seta ft” of tarsus IV long (33), thickened, curved and acute, claw-like. Solenidia longer than setae d on genu and tibia of leg I (solenidion φ the longest, 47), tarsal solenidia as long as seta ft” or longer, but shorter than setae tc . Famulus short, baculiform.