Galumnella (Galumnella) sidorchukae, Liang & Yang & Ren & Zheng, 2019

Liang, Wenqin, Yang, Maofa, Ren, Guoru & Zheng, Qianfen, 2019, New species and new records of the subgenus Galumnella (Galumnella) (Acari Oribatida: Galumnellidae) from China, Zootaxa 4647 (1), pp. 424-440 : 430-434

Galumnella (Galumnella) sidorchukae sp. nov.

(Figures 15−29)

Diagnosis. Surface of body with microfoveolae. Entire surface of notogaster, pteromorphs and anogenital region with reticulate pattern. Rostrum rounded. Rostral lamellar, notogastral, epimeral and anogenital setae setiform, short, thin, smooth. Bothridial setae long, with head dilated unilaterally, barbed, jagged. Notogaster with one pair of dorso-lateral pore. Three genital setae aligned along anterior margin of each plate. Postanal porose area absent. Leg tarsi with one claw.

Description. Dimensions. Body length 388 (holotype: female), 370–450 (ten paratypes: three females, seven males); width 292 (holotype), 280–320 (ten paratypes). Prodorsum setae: ro (16–20), le (8–12), in (4), bs (142–146), lateral pores: po, diameter 4, subcapitulum: length 73–77, width 52–57, subcapitular setae: a (20–24), h (8–12), m (12–15), adoral setae (8–10), palp: length 61–65, chelicera: length 158, epimeral setae: 1a, 3a, 3b, 4a and 4b (4–6), 3c and 4c (6–8), genital setae: g 1 – g 3 (8–12), g 4 – g 6 (6–10), ag (6–8), an 1 and an 2 (6–8), ad 1 – ad 3 (6–10).

Integument. Body dark brown. Surface of body, pteromorphs, genital and anal plates, and subcapitular mentum microfoveolate. Pteromorphs, notogaster and anogenital region with reticulate pattern.

Prodorsum (Figures 15, 17, 20, 21). Rostrum rounded. Lamellar and sublamellar lines distinct, parallel, curving backwards. Prodorsal setae ro and le setiform, short and smooth, in very short or represented by alveoli only. Bothridial seta (bs) long, falciform, with head dilated on one side, barbed, jagged. Exobothridial seta and porose area Ad not found.

Notogaster (Figures 15, 18, 19). Anterior notogastral margin distinctly developed, slightly convex. Ten pairs of notogastral setae present, short, thin, smooth, setae c represented by alveoli. One pair of lateral pores situated far anterior to setae lm. Lyrifissures im located posterior to setae la. Opisthonotal gland openings (gla) located between h 3 and p 3. Lyrifissures ip distinct. Median pore (mp) absent.

Gnathosoma (Figures 16, 22, 23). Subcapitulum longer than wide. Subcapitular setae a, m, h setiform, thin, smooth, a longer than m and h, h shortest. Two pairs of adoral setae setiform, smooth. Palps with setation 0-2-1-3- 9(+1ω). Chelicera with three small teeth on dorsal digit.

Epimeral region (Figure 16). Epimeral setal formula: 1-0-3-3. Seven pairs of simple, thin epimeral setae present, setae 3c and 4c longer than others. Apodemes clearly visible. Pedotectum II triangular, rounded anteriorly in ventral view. Discidium well developed, rounded distally. Circumpedal carina (cp) distinct, long, reaching pedotecta I.

Ano-genital region (Figures 16, 24, 25). Six pairs of genital setae, g 1 –g 3 located on anterior edge of genital plates, longer than the other three, one pair of aggenital (ag), two pairs of anal (an 1, an 2) and three pairs of adanal (ad 1, ad 2, ad 3) setae all smooth and setiform.Adanal lyrifissures iad located in preanal position. Postanal porose area (Ap) absent.

Legs (Figures 26−29). Leg tarsi with one strong claw. Formulae of leg setation and solenidia: I (1-4-3-4-20) [1- 2-2], II (1-4-3-4-15) [1-1-2], III (1-2-1-3-15) [1-1-0], IV (1-2-2-3-12) [0-1-0]; homology of setae and solenidia indicated in Table 1 . Some ventral setae of tibiae and tarsi with long cilia. Solenidia ω 1 and ω 2 on tarsi II, σ on genua III straight or weakly curved, rod-like. Other solenidia rather long, setiform, with thinner tips. Famulus short, slightly dilated and truncated distally, inserted posterior or posterolateral to solenidia ω 1.

Material examined. Holotype: male (in alcohol, GXNG02 -HR-2011), China, Nonggang National Nature Reserve (22°38’N, 107°03’E), Guangxi Province, from dark loamy soil under trees, 8 May 2011, col. Rong Huang ( GUGC) . Paratypes: eleven females and nine males (in alcohol, GXNG02 -HR-2011), same data as holotype .

Etymology. The species is named in honor of the late specialist in Oribatida, Dr. Ekaterina (Katya) Sidorchuk, who was editor at Zootaxa for several years and then editor for the Journal Acarologia, her excellent editorship was greatly appreciated by many colleagues. She passed away in a tragic accident on the Maldives. We wish to honour her contribution.

Remarks. Galumnella (G.) sidorchukae sp. nov. is most similar to Galumnella (G.) cellularis Balogh & Mahunka, 1967 from Vietnam in having microfoveolae on the body and polygonal ornamentation on notogaster, pteromorphs and anogenital region. However, it clearly differs from the latter by its bigger body size (370–450×280–320 versus 275×195), the unilaterally barbed and jagged bothridial setae (versus smooth in Galumnella (G.) cellularis ), by having one pair of lateral pores (versus absent in Galumnella (G.) cellularis ), and by the absence of postanal porose area (versus presence in Galumnella (G.) cellularis ).