Perscheloribates crassisetosus, Ermilov & Rybalov & Franke, 2011

Ermilov, Sergey G., Rybalov, Leonid B. & Franke, Kerstin, 2011, Ethiopian oribatid mites of the family Scheloribatidae (Acari: Oribatida), African Invertebrates 52 (2), pp. 311-311 : 317-320

Perscheloribates crassisetosus sp. n.

)LJV 4±6

Etymology:)URP /DWLQ crassus (thick) and seta, referring to the thickened lamellar setae. Diagnosis:This species is distinguished by the following combination of character states: body size 481–514 × 348–365; translamellar line present, interrupted medially; lamellar setae thickened; sensilli long, with asymmetrically dilated, barbed head; one pair of muscle sigilla present posterior to each saccule Sa, three pairs of muscle sigilla present posterior to each saccule S1; prolamella present; coronal setae of ovipositor present; hypostomal setae a thicker than others, setae m very short; tarsi I with 18 setae.

Description:

Measurements. %RG\ OHQJWK 48l (KRORW\SH ƃ), ƽl4 (SDUDW\SH Ƃ); ERG\ ZLGWK ³48 (KROR‒ W\SH ƃ), ³6ƽ (SDUDW\SH Ƃ).

Integument. Body brown. Dorsal and ventral surfaces of body smooth. Lateral surfaces of body weakly granulate.

Prodorsum ()LJV 4$; ƽ$±&). 5RVWUXP URXQGHG LQ GRUVDO YLHZ. /DPHOODH PRUH WKDQ half length of prodorsum. Translamellar line present; thin, interrupted medially. Rostral (57–65) and interlamellar (151–159) setae setiform, barbed. Lamellar setae (155–172) unusually thickened in basal half, ciliate. Sensilli long (94), with asymmetrically dilated head; head shorter than stalk, slightly barbed. Lateral region ()LJ. ƽ$) ZLWK SURODPHOOD present and sublamellar line long. Sublamellar areae porosae oblong or oval (8–12 ×

)LJ. 4. Perscheloribates crassisetosus sp. n.: (A) dorsal view, legs not shown; (B) ventral view, legs, palps DQG VXEFDSLWXODU VHWDH QRW VKRZQ. 6FDOH EDU = ƻoo ȝP.

4–6). Lateral carina (kf) as typical for many Scheloribatidae species, but part parallel to sublamellar line longer, more prominent. Exobothridial setae (ex, 8) thin, slightly barbed.

Notogaster ()LJ. 4$). 'RUVRVHMXJDO VXWXUH ZHDNO\ FRQYH[PHGLDOO\. 2QO\ RQH SDLU RI thin, smooth notogastral setae present (p 1, 16); nine other pairs presented by alveoli. All sacculi oblong, distinct. One pair of muscle sigilla (not sacculi) present posterior to each saccule Sa. Three pairs of muscle sigilla present posterior to each saccule S1. &LUFXPJDVWULF EDQG RI PXVFOH VLJLOOD GLVWLQFW.2SLVWKRQRWDO JODQG RSHQLQJ DQG O\UL¿VVXUHV indistinct, but developed in typical arrangement for genus.

Anogenital region ()LJV 4%; ƽ'±)). Two pairs anal (8–12), three pairs adanal (20), one pair aggenital (8–12) and four pairs of genital (g 1, 20; g 2 – g 4, 8–12) setae setiform, VPRRWK. /\UL¿VVXUHV iad in typical position for genus. Ovipositor: length of lobes 86, length of cylindrical distal part 96, width of cylindrical distal part 32. All setae of RYLSRVLWRU VHWLIRUP, VPRRWK. /REH VHWDH ȥ 1 § IJ 1 (24) ORQJHU WKDQ ȥ 2 § IJ a § IJ b § IJ c (14). Coronal setae present (k, 8).

Epimeral region ()LJ. 4%). $SRGHPHV l, ƻ, VHMXJDO, ³ DQG FLUFXPSHGDO FDULQD ZHOO‒ developed. All epimeral setae (12 – 20) setiform, smooth.

Gnathosoma ()LJV 6$±&). 6XEFDSLWXOXP ORQJHU WKDQ ZLGH: ll8 î loƻ. +\SRVWRPDO VHWDH setiform; a (26) slightly longer and thicker than h (24), both hardly barbed, setae m very short (8), smooth. Lateral lips with two pairs of adoral setae (12), setiform, barbed. Palps (OHQJWK 7³) ZLWK VHWDWLRQ o±ƻ±l±³±9(+lȦ). $OO VHWDH (H[FHSW VRPH RQ WDUVL) ZHDNO\ DQG indistinctly barbed. Chelicerae (length 131) chelate-dentate; cheliceral setae setiform, barbed, cha (61) longer than chb (32).

)LJ. ƽ. Perscheloribates crassisetosus sp. n.: (A) lateral view of prodorsum, gnathosoma and legs not shown; (%) ODPHOODU VHWD; (&) VHQVLOOXV; (') JHQLWDO SODWH, ULJKW; (() DQDO SODWH, ULJKW, DQG DGDQDO VHWDH; ()) RYLSRVLWRU. 6FDOH EDUV $ = loo ȝP; %±) = ƽo ȝP.

Legs ()LJV 6', 6().)RUPXODH RI OHJ VHWDWLRQ DQG VROHQLGLD:, (l±ƽ±³±4±l8)>l±ƻ±ƻ@, ,, (1–5–2–4–15) [1–1–2], III (2–3–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1–0]; homolo- J\ RI VHWDH DQG VROHQLGLD LQGLFDWHG LQ 7DEOH ƻ. $OPRVW DOO VHWDH EDUEHG.)DPXOXV VKRUW, VWUDLJKW, EOXQW‒HQGHG. 6ROHQLGLD Ȧ 1 RQ WDUVL ,, Ȧ 1 DQG Ȧ 2 on tarsi II, rod-shaped; other solenidia setiform.

+RORW\SH: ƃ (7+,23,$: /RFDOLW\ 6‒8 (=,63).

3DUDW\SH: (7+,23,$: Ƃ /RFDOLW\ 6‒lo (3&).

Distribution: At present, this species is known only from Ethiopia.

Remarks: In having the combination of long sensilli, with asymmetrically dilated and slightly barbed head, and the presence of translamellar line (interrupted medially), P. crassisetosus sp. n. is very similar to P. luminosus from the tropics ( Hammer 1961); however, it clearly differs from the latter by having a larger body (481–514 vs 420 in P. luminosus ) and thicker lamellar setae (thin in P. luminosus ).

)LJ. 6. Perscheloribates crassisetosus sp. n.: (A) subcapitulum; (B) palp; (C) chelicera; (D) leg I, right, DQWLD[LDO YLHZ; (() OHJ,9, ULJKW, DQWLD[LDO YLHZ. 6FDOH EDUV $, &±(= ƽo ȝP; % = ƻo ȝP.