Sperchon (Sperchon) kinabaluensis, Smit, Harry & Pešić, Vladimir, 2014

Smit, Harry & Pešić, Vladimir, 2014, Water mites from Mount Kinabalu and the Crocker Range, Borneo, Malaysia (Acari: Hydrachnidia), with the description of 34 new species, Zootaxa 3876 (1), pp. 1-71: 9-13

publication ID

http://dx.doi.org/10.11646/zootaxa.3876.1.1

publication LSID

lsid:zoobank.org:pub:071AFC59-C2EA-429A-8511-BAC5C4539C04

persistent identifier

http://treatment.plazi.org/id/03D48784-A923-FFBA-FF35-1121FE45FC5C

treatment provided by

Plazi

scientific name

Sperchon (Sperchon) kinabaluensis
status

n. sp.

Sperchon (Sperchon) kinabaluensis  n. sp.

( Figs. 4 A –KView FIGURE 4 A – K, 5 A –CView FIGURE 5 A – C)

Type series. Holotype male, dissected and slide mounted, Kipungit River, Poring Hot Springs, Mt. Kinabalu, 6 º 0 2.776 N, 116 º 41.432 E, alt. 568 m asl., 15 -ix- 2012 ( RMNH). Paratype: one female, first stream Minduk Sirung Trail, Alab, Crocker  Range, Borneo, Malaysia, 5 º 49.249 N, 116 º 19.862 E, alt. 1781 m asl., 23 -ix- 2012, palps and gnathosoma dissected and slide mounted, idiosoma conserved in Koenike fluid ( RMNH).

Further records. 1 (juv.)/0/0, Little Lumotok stream, Sayap, Borneo, Malaysia, 6 º 0 9.497 N, 116 º 34.027 E, alt. 1069 m asl., 17 -ix- 2012.

Diagnosis. Muscle attachment plates sclerotized, with pores often subtriangular, giving the plates the aspect of a spoke-wheel. P 2 distoventrally with a long rounded projection, inner margin of the segment with 4–5 stout setae, closer to ventral margin; P 3 with a few setae on inner and outer margin, ventrolaterally with one club-shaped seta on a small protuberance in distal part; P 4 relatively short, with ventral peg setae close to each other, proximal peg seta larger than distal one.

Description. Membranous integument papillate; dorsal integument papillae can be enlarged, in male obfuscating the areolate ground pattern. Dorsum with ten paired muscle attachment plates ( Fig. 5 AView FIGURE 5 A – C), from anterior to posterior: medially, 1) roundish prefrontalia, 2) large plates consisting of postfrontalia, postocularia and dc-1, 3) roundish dc- 2 located close to each other (fused in male); 4) larger and more distanced dc- 3 (more roundish in male, elongated in female), 5) small dc- 4; laterally, 6) round plate dl- 1 flanking praeocular setae, 7)- 10) round or round-elongated plates dl- 2-5 located at level of interspace dc- 1 / 2, dc- 3, and interspace dc- 3 / 4, respectively. The pores on the plates often subtriangular giving the plate the aspect of a spoke-wheel. Coxal field: Cx-III without a glandularium. Genital field: Ac- 1–2 longish, Ac- 3 roundish. Excretory pore surrounded by a sclerotized ring. Capitulum with very short rostrum ( Figs. 4 D –EView FIGURE 4 A – K). Palp: P 1 without dorsal seta, P 2 distoventrally with a long rounded projection, at its tip bearing three fine setae, two long and one short, inner face of the segment with 4–5 stout setae, closer to ventral margin; P 3 ventrally slightly concave, with a few setae on inner and outer face, laterally with one club-shaped seta on a small protuberance in distal part; P 4 relatively short, with ventral peg setae close to each other, proximal peg seta larger than distal one. Legs: III –IV-leg with short, not plumose dorsal setae ( Fig. 4 FView FIGURE 4 A – K); claws with blade slightly protruding, bearing a long dorsal and a short ventral clawlet ( Fig. 4 GView FIGURE 4 A – K).

Measurement. Male (holotype)—Idiosoma (ventral view: Fig. 4 AView FIGURE 4 A – K) length 894, width 688; distance between anterior tip of Cx-I and posterior margin of Cx-IV 494, Cx-III width 650; genital flap ( Fig. 4 BView FIGURE 4 A – K) length 113–116, length Ac- 1–3: 45 –47, 52–53, 33– 36; ejaculatory complex ( Fig. 4 KView FIGURE 4 A – K) L 117. Capitulum length 178; chelicera ( Fig. 4 CView FIGURE 4 A – K) total length 169, height 50, length/height ratio 3.4, basal segment length 138, claw length 40, basal segment/ claw length ratio 3.44; palp: total L 226, dorsal length/height, dorsal length/height ratio: P1, 19/ 35, 0.52; P2, 60/ 68, 0.89; P3, 54/ 48, 1.13; P-4, 51/ 28, 1.8; P 5, 41.5 / 15, 2.75; length P 2 /P 4 ratio 1.18. Legs: dorsal length of I-leg- 2–6: 66, 68, 146, 143, 133; dorsal length of IV-leg- 2–6: 99, 119, 208, 172, 184.

Female (paratype)—Idiosoma length 1150, width 938; distance between anterior tip of Cx-I and posterior margin of Cx-IV 637, Cx-III width 803; genital flap ( Fig. 5 BView FIGURE 5 A – C) length 145, length Ac- 1–3: 73 –75, 61–63, 50– 53. Capitulum ventral length 234; chelicera total length 215, height 53, length/height ratio 3.9, basal segment length 181, claw length 47, length basal segment/claw ratio 3.87; palp ( Fig. 5 CView FIGURE 5 A – C): total length 317, dorsal length/height, dorsal length/height ratio: P1, 29/ 44, 0.67; P2, 75/ 81.5, 0.93; P 3, 81.5 / 69, 1.18; P 4, 78.5 / 35, 2.27; P 5, 51.5 / 20, 2.58; length P 2 /P 4 ratio 0.96. Legs: dorsal length of I-leg- 2-6: 91, 133, 184, 197, 156; dorsal length of IV-leg- 2–6: 119, 148, 266, 219, 194.

Etymology. Named after the island where the new species was detected.

Remarks. Due to the similar morphology of dorsum (muscle attachment plates sclerotized, dc- 2 fused to each other in male), venter (Cx- 3 without a glandularium, excretory pore surrounded by a sclerotized ring), palp (P 2 with rounded distoventral projection) and legs (claw with dorsal and ventral clawlet), the new species resembles Sperchon cornutoides Lundblad, 1941  from Java ( Lundblad 1936, 1971). This species differs in the finely striated integument, dorsal plates without the characteristic spoke-wheel porosity, and the palp (P- 2 with a shorter distoventral projection, setae on inner margin of the segment closer to dorsal margin, P- 3 ventral margin without a club-shaped seta in distal part).

Distribution. Borneo.

RMNH

National Museum of Natural History, Naturalis