Gymnobodes paraminimus, Tang & Zhang & Guo & Luo & Jiang & Pan, 2023

Tang, Jin, Zhang, Gongaote, Guo, Junqi, Luo, Lingxuan, Jiang, Jiamei & Pan, Hongbo, 2023, Contribution To The Knowledge Of The Oribatid Mite Genus Gymnobodes (Acari, Oribatida, Carabodidae), With Description Of A New Species From Mexico, Acta Zoologica Academiae Scientiarum Hungaricae 69 (2), pp. 83-92 : 85-89

Gymnobodes paraminimus sp. n.

http://zoobank.org/ 1793D22B-3F5F-4FC5-8112-C631060019F3 ( Figs 1–3 )

Material examined – Holotype (female) and six paratypes (six females): Mexico, 20°33’N, 87°13’W, Quintana Roo, Municipio de Solidaridad, vicinities of Playa del Carmen, leaf litter under trees and bushes in secondary semi-evergreen tropical forest (date and collector unknown; collection of the Tyumen State University Museum of Zoology , Tyumen, Russia; see GASHEV et al. 2005).

Type deposition – The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany; six paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia . All specimens are preserved in 70% solution of ethanol with a drop of glycerol.

Etymology – The species name paraminimus refers to the similarity between the new species and Gymnobodes minimus Ermilov, 2016 .

Diagnosis – Body length: 255–285. Dorsal side of prodorsum with tubercles and strong tuberculate-like ridges; notogaster with sparse tubercles; genital and anal plates with sparse foveolae; anogenital region with thin, curved ridges. Translamella present. Bothridial seta with phylliform (dilated distally) head. Humeral process anteriorly triangularly pointed. Epimeral setal formula: 1–1–3–3. Aggenital setae absent.

Description of adult – Measurements. Body length: 255 (holotype), 255–285 (paratypes); notogaster width: 150 (holotype), 150–165 (paratypes).

Integument ( Figs 1A, C, D ; 2A–C ; 3A–D ). Body color light brown. Body with dense, granulate microsculpturing. Dorsal side of prodorsum (between lamellae) with tubercles (diameter up to 9) and strong tuberculate-like ridges; lateral side of prodorsum with foveolae (diameter up to 7). Notogaster with sparse tubercles (diameter up to 9). Subcapitular mentum with slight foveolae (diameter up to 5). Genital and anal plates with sparse foveolae (diameter up to 2). Anogenital region with thin, curved ridges. Marginal part of ventral plate slightly longitudinally striate. Antiaxial side of leg femora I–IV and trochanters III, IV with foveolae (diameter/length up to 7).

Prodorsum ( Figs 1A, B, D ; 2B ). Rostral margin broadly rounded. Lamella with strong distal tooth-like process; translamella present, well visible in dorsal view. Rostral (9–11), lamellar (9–11) and interlamellar (4–6) setae setiform, thin, smooth; bothridial seta (34–37) with well developed, phylliform (dilated distally) head, having slight ribs and indistinct barbs; opening of bothridium complete, not interrupted ventrally; exobothridial seta absent. shown). Scale bars 50 μm (A, C, D), 10 μm (B)

Notogaster ( Figs 1A, D ; 2A ). Anterior notogastral margin straight; posterior notogastral margin broadly rounded. Humeral process distinctly developed, anteriorly triangularly pointed. Notogastral setae (4–6) setiform, thin, smooth. Lyrifissures im and ip distinct, others (ia, ih, ips) not observed; opisthonotal gland opening poorly visible.

Gnathosoma ( Figs 2C–E ). Subcapitulum size: 64–67 × 49–52; subcapitular setae (a: 7; m: 5; h: 4) setiform, thin, smooth. Palp length: 32–34; setation: 0–2–1–2–8(+ω); postpalpal seta (5) spiniform. Chelicera length: 71–75; setae (cha: 19–22; chb: 9–11) setiform, barbed.

Epimeral and lateral podosomal regions ( Figs 1C, D ). Epimeral setal formula: 1–1–3–3; setae (4–6) setiform, thin, smooth. Slight concavity present between sejugal apodemes. Discidium distinct.

Anogenital region ( Figs 1C, D ; 2A ). Genital, anal and adanal setae (4–6), setiform, thin, smooth; aggenital seta absent. Adanal lyrifissure not visible.

chelicera, left, paraxial view. Scale bars 50 μm (A), 20 μm (B, C, E), 10 μm (D)

Legs ( Figs 3A–D ). Claw of each leg strong, smooth. Porose area on femora I–IV distinct; porose area on trochanters III, IV not observed. Formulas of leg setation and solenidia: I (1–4–3–4–16) [1–2–2], II (1–4–3–3–15) [1–1–2], III (2–3–1–2–15) [1–1–0], IV (1–2–2–2–12) [0–1–0]; homology of setae and solenidia indicated in Table 1.

left, antiaxial view. Scale bar 20 μm

Remarks – Gymnobodes paraminimus sp. n. is morphologically similar to G. minimus from Cuba in having sparse small tubercles on the notogaster and minute foveolae on genital and anal plates, however, it differs from the latter by the: smaller elongation of body (length/width of body ≈ 1.7 versus 2.0); presence (versus absence) of translamella; presence of tubercles and strong tuberculate-like ridges on the prodorsum; absence of a pair of depressions anteriorly to interlamellar setae.

Figures

Fig. 1. Gymnobodes paraminimus sp. n., adult:A = dorsal view; B = bothridial seta; C = ventral view (gnathosoma and legs not shown); D = right lateral view (gnathosoma and legs not

Fig. 2. Gymnobodes paraminimus sp. n., adult: A = posterior view; B = anterior part of prodorsum, dorsoanterior view; C = subcapitulum, ventral view; D = palp, left, paraxial view; E =

Fig. 3. Gymnobodes paraminimus sp. n., adult: A = leg I, right, antiaxial view; B = leg II, without tarsus, right, antiaxial view; C = leg III, without tarsus, left, antiaxial view; D = leg IV,