Malaconothrus kawensis, Miko, 2019

Miko, Ladislav, 2019, Oribatid mites (Acarina, Oribatida) from French Guyana II. Two new species from superfamily Crotonioidea Thorell, 1876, Acarologia 59 (3), pp. 348-363 : 349-352

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.

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.

Figures

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; ad1 – adanal seta 1;c1-c3, cp, d1-d2, e1-e2, f2, h1-h3, p1-p3 – notogastral setae; ex1 – exobothridial seta

Figure 2 Malaconothrus kawensis n. sp., adult female: A – prodorsal setaro in dorsal and lateral view, setale in dorsal and lateral view, complex of setae in-ex; B – lateral view on posterior part of the body; C – notogastral setaed1, f2 ande2 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: ad1-ad3 – adanal setae 1-3;d2, e1-e2, f2, h1-h3, p1-p3 – notogastral setae; ex1 – exobothridial seta 1;in – interlamellar seta; le – lamellar seta; ro – rostral seta.