Scheloribates acutirostrum, 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 : 313-316

Scheloribates acutirostrum sp. n.

)LJV l±³

Etymology:)URP /DWLQ acutus (point) and rostrum, referring to the pointed rostrum.

Diagnosis:This species is distinguished by the following combination of character states: body size 614–697 × 448–481; dorsal and ventral surfaces of body smooth; rostrum pointed; translamellar line present, thin, interrupted medially; sensilli spindle-form, barbed, with short apical part; one pair of notogastral setae and nine pairs of notogastral alveoli; prolamellae absent; tarsi I each with 19 setae.

Description:

Measurements. %RG\ OHQJWK 647 (KRORW\SH ƃ), 6l4±697 (SDUDW\SHV: ³ƃ, lƂ); ERG\ ZLGWK 48l (KRORW\SH ƃ), 448±48l (SDUDW\SHV: ³ƃ, lƂ).

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

Prodorsum ()LJV l$; ƻ$±&). 5RVWUXP SRLQWHG LQ GRUVRYHQWUDO YLHZ. /DPHOODH PRUH WKDQ half of prodorsum. Translamellar line present; thin, interrupted medially. Rostral (ro,

)LJ. l. Scheloribates acutirostrum sp. n.: (A) dorsal view, legs not shown; (B) ventral view, legs, palps and VXEFDSLWXODU VHWDH QRW VKRZQ. 6FDOH EDU = ƻoo ȝP.

94–102), lamellar (le, 155–172) and interlamellar (in, 196–229) setae setiform, barbed. Sensilli (ss, 102–116) spindle-form, barbed; apical part short. Lateral region ()LJ. ƻ%) with prolamella absent but sublamellar line present. Sublamellar areae porosae oblong or oval (Al, 12–16 × 4–8). Exobothridial setae (ex, 12) thin, slightly barbed.

Notogaster ()LJ. l$). 'RUVRVHMXJDO VXWXUH ZHDNO\ FRQYH[PHGLDOO\. 2QO\ RQH SDLU RI thin, smooth notogastral setae (p 1, 12) present; other nine pairs represented only by alveoli. Sacculi Sa and S1 oblong, distinct; S2 and S3 very small, inconspicuous. Opis- WKRQRWDO JODQG RSHQLQJ DQG O\UL¿VVXUHV LQFRQVSLFXRXV (H[FHSW im) but present in typical arrangement for genus.

Anogenital region ()LJV l%; ƻ'±)). Two pairs anal (an 1, an 2, 20–24), three pairs adanal (ad 1 – ad 3, 24), one pair aggenital (ag, 12–16) and four pairs of genital (g 1, 24–28; g 2 – g 4, l6±ƻo) VHWDH VHWLIRUP, VPRRWK. /\UL¿VVXUHV iad in typical position for genus. Ovipositor: length of lobes 86 – 90, length of cylindrical distal part (bDp) 98 – 110, width of cylindrical distal part 41 – 49. All setae of ovipositor setiform, smooth. Lobe setae ȥ 1 § IJ 1 (36 – 41) ORQJHU WKDQ ȥ 2 § IJ a § IJ b § IJ c (16 – 20). Coronal setae absent.

Epimeral region ()LJ.l%).$SRGHPHV l,ƻ, VHMXJDO DQG FLUFXPSHGDO FDULQD ZHOO‒GHYHORSHG. Apodemes 3 present, but weakly visible. All epimeral setae (16 – 24) setiform, smooth. Gnathosoma ()LJV ³$±&). 6XEFDSLWXOXP ORQJHU WKDQ ZLGH: ll8±lƻ7 î lo6±lƻ³. +\SR‒ stomal setae setiform, weakly and indistinctly barbed; h (41) longer than m (32) and a (24). Lateral lips with two pairs of adoral setae (or 1, or 2, 12–16), setiform, barbed. 3DOSV (OHQJWK 8ƻ±loƻ) ZLWK VHWDWLRQ o±ƻ±l±³±9(+lȦ). $OO VHWDH (H[FHSW VRPH RQ WDUVL) weakly and indistinctly barbed. Chelicerae (length 151–164) chelate-dentate; cheliceral setae setiform, barbed, cha (57–65) longer than chb (32–41).

)LJ. ƻ. Scheloribates acutirostrum sp. n.: (A) rostrum; (B) lateral view of prodorsum, gnathosoma and legs QRW VKRZQ; (&) VHQVLOOXV;(') JHQLWDO SODWH,ULJKW;(() DQDO SODWH,ULJKW,DQG DGDQDO VHWDH;()) RYLSRVLWRU. 6FDOH EDUV $, &, (,) = ƽo ȝP; % = loo ȝP; ' = ƻo ȝP.

Legs ()LJV ³', ³(). 0RUSKRORJ\ RI VHJPHQWV VLPLODU WR RWKHU VSHFLHV RI Scheloribates (H.J., %D\DUWRJWRNK ƻooo).)RUPXODH RI OHJ VHWDWLRQ DQG VROHQLGLD:, (l±ƽ±³±4±l9) [1–2–2], II (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]; KRPRORJ\ RI VHWDH DQG VROHQLGLD LQGLFDWHG LQ 7DEOH l. $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.

)LJ. ³. Scheloribates acutirostrum sp. n.: (A) subcapitulum; (B) palp; (C) chelicera; (D) leg I, right, paraxial YLHZ; (() OHJ,9, ULJKW, SDUD[LDO YLHZ. 6FDOH EDUV $, & = ƽo ȝP; % = ƻo ȝP; ', (= loo ȝP.

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

3DUDW\SHV: (7+,23,$: /RFDOLWLHV 6‒l (lƂ 3&), 6‒ƽ (ƻƃ 6=01), 6‒lƻ (lƃ 6=01).

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

Remarks: In having the combination of a pointed rostrum, spindle-form sensilli and prolamella absent S. acutirostrum sp. n. is similar to S. sphaeroides Hammer, 1973 from Polynesia and the Galapagos Islands (Hammer 1973). It differs from the latter in the relative length of interlamellar and lamellar setae (in longer than le in S. acutirostrum ; in not longer than le in S. sphaeroides ), the shape of the sensilli (head well developed, barbed and with short apical part in S. acutirostrum ; head weakly developed, smooth and with long apical part in S. sphaeroides ) and the presence of only notogastral setae p 1 (p 1, h 1 – h 3 present in S. sphaeroides ). In having the combination of a pointed rostrum and spindle-form sensilli, S. acutirostrum sp. n. is similar to S. rostrodentatus Hammer, 1977 from Pakistan (Hammer 1977), but differs from the latter by having smaller body (614–697 vs 980 in S. rostrodentatus ) and in the absence of a prolamella (present in S. rostrodentatus ).