New Faunistic And Taxonomic Data On Oribatid Mites (Acari: Oribatida) Of Mexico Author Serrano-Herrera, Adela Author Espinosa-Sanchez, Juan Manuel text Acta Zoologica Academiae Scientiarum Hungaricae 2023 2023-12-20 69 4 385 397 http://dx.doi.org/10.3389/fnana.2023.1330452 journal article 10.17109/AZH.69.4.385.2023http://zoobank.org/DC1720A2-1E2D-4AC4-AC10-C640F0A14A7C 2064-2474 10777948 Mucrobates solidarensis sp. n. http://zoobank.org/ F6BABBB6-5651-4DAB-A132-86036E2E735A ( Figs 1 , 2 ) Material examined – Holotype (female) and 10 paratypes ( five males and five females ): Mexico , 20°41’N , 87°02’W , Quintana Roo , Municipio de Solidaridad , vicinities of Playa del Carmen , leaf litter in large karst pit under trees and bushes in secondary semi-evergreen tropical forest. Type deposition. – The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany ; 10 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 solidarensis refers to the place of origin, vicinities of Municipio de Solidaridad. Diagnosis – Body length: 450–495. Prolamella directed to lateral side of prodorsum, lateral to insertion of rostral seta; translamella represented by two parts near lamellae; keel-shaped ridge present. Rostral, lamellar and interlamellar setae long, setiform, barbed; bothridial seta long, fusiform, barbed; exobothridial seta medium-sized, setiform, slightly barbed. Notogastral setae p 1 – p 3 short, setiform, thin, roughened; other setae vestigial. Posterolateral and posterior parts of notogaster with small sparse tubercles. Carina at the lateral margin of the coxisternum simple. Pedotectum II rounded distally. Epimeral and anogenital setae short, setiform, roughened. Leg femora III and IV point- ed distoventrally; some segments with thick, heavily barbed setae. Fig. 1. Mucrobates solidarensis sp. n. , adult (not shown: legs): A = dorsal view; B = ventral view; C = right lateral view. Scale bar: 100 μm Description of adult – Measurements . Body length: 495 ( holotype ), 450–495 ( paratypes ); notogaster width: 285 ( holotype ), 270–307 ( paratypes ). No difference between males in females in body size. Integument . Body color brown. Cuticle densely microporose (visible under high mag- nification in dissected specimens). Lateral side of body partially densely microgranulate. Posterolateral and posterior parts of notogaster with small sparse tubercles. Prodorsum ( Figs 1A, 1C ). Rostrum rounded. Lamella slightly shorter than half of prodorsum; prolamella directed to lateral side of prodorsum, lateral to insertion of rostral seta; translamella represented by two distinct parts near lamellae, each part slightly convex, of- ten bifurcate (sometimes asymmetrically); sublamella absent; sublamellar porose area (4–6) rounded; keel-shaped ridge slightly developed. Rostral (67–75), lamellar (101–109) and interlamellar (112–127) setae setiform, barbed; bothridial seta (77–86) with long, roughened stalk and fusiform (narrowed distally), barbed head; exobothridial seta (30–41) setiform, slightly barbed. Dorsosejugal porose area not observed. Dorsophragma semi-oval. Notogaster ( Figs 1A, 1C ). Posterior notogastral setae ( p 1 – p 3 : 9–11) setiform, thin, roughened; other setae vestigial. Four pairs of sacculi drop-like (in lateral view). Opisthonotal gland opening and all lyrifissures distinct. Gnathosoma ( Figs 2A–C ). Subcapitulum size: 101–109 × 75–82; all subcapitular setae ( a : 15–17; m : 13–15; h : 22–30) setiform, barbed; m thinnest; both adoral setae (7) setiform, bent distally, barbed. Palp length: 71–79; setation: 0–2–1–3–9(+ω); postpalpal seta (5–7) spini- form, roughened. Chelicera length: 111–116; setae ( cha : 30–32; chb : 19–22) setiform, barbed. Epimeral and lateral podosomal regions ( Figs 1B, 1C ). Epimeral setal formula: 3–1–3–3; all setae ( 1b , 1c , 3b , 3c : 26–34; others: 17–19) setiform, thin, roughened. Humeral porose areas Am and Ah not observed. Carina at the lateral margin of the coxisternum simple. Pedotectum II rounded distally. Discidium slightly developed. Anogenital region ( Figs 1B, 1C ). Genital, aggenital, anal, and adanal setae (9–11) setae setiform, thin, roughened. Adanal lyrifissure distinct. Marginal porose area represented by some band-like parts. Legs ( Figs 2D–G ). Median claw distinctly thicker than lateral claws; all claws barbed on dorsal side; lateral claw with minute tubercle ventrodistally. Anterodorsal process on tibiae III and IV well developed; tibiae I and II with small proximoventral tubercle; trochanter of all legs with posterior collar-like tectum; femora III and IV pointed distoventrally. Porose area on tarsi I–IV, tibiae I–IV, femora I–IV, and trochanters III, IV well visible. Formulas of leg setation and solenidia: I (1–5–3–4–19) [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]; homology of setae and solenidia indicated in Table 1 . Famulus of tarsi I short, erect, slightly dilated and blunted distally, inserted posterior to solenidion ω 2 ; solenidion ω 1 on tarsus I, ω 1 and ω 2 on tarsus II and σ on genu III thickened, rounded distally versus other solenidia setiform, pointed; some segments with thick, heavily barbed setae. Remarks – Mucrobates solidarensis sp. n. differs from both known species of the genus ( M. cayoaguaensis , M. fissuratus ) by the presence of translamellar line (versus absent in M. cayoaguaensis , M. fissuratus ) and rounded pedotectum II (versus absent in M. cayoaguaensis ; bifurcate in M. fissuratus ). The other leg IV, right, antiaxial view. Scale bars: 10 μm (B), 20 μm (A, C), 50 μm (D–G) Fig. 2. Mucrobates solidarensis sp. n. , adult: A = subcapitulum, ventral view; B = palp, right, antiaxial view; C= chelicera, left, paraxial view; D = leg I, right, antiaxial view; E = leg II (not shown: tarsus), right, antiaxial view; F = leg III (not shown: tarsus), left, antiaxial view; G = Table 1 . Leg setation and solenidia of adult Mucrobates solidarensis sp. n.

Leg	Tr	Fe	Ge	Ti	Ta
I	v’	d, (l), bv”, v”	(l), v’, σ	(l), (v), φ, φ 1 2	(ft), (tc), (it), (p), (u), (a), s, (pv), v’, (pl), ε, ω 1, ω 2
II	v’	d, (l), bv”, v”	(l), σ	(l), (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv), ω 1, ω 2
III	v’, l’	d, l’, ev’	l’, σ	l’, (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv)
IV	v’	d, ev’	d, l’	l’, (v), φ	ft”, (tc), (p), (u), (a), s, (pv)

Note: Roman letters refer to normal setae; Greek letters to solenidia (except ε = famulus); single quotation mark ( ’ ) designates seta on the anterior and double quotation mark ( ” ) seta on the posterior side of a given leg segment; parentheses refer to a pair of setae. distinctive characters of the new species compared with other members of Mucrobates can be found in the identification key below.