Corynoppia gamoensis Ermilov, 2025, sp. nov.
Creators: name: Ermilov, Sergey G.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Oppiidae
Corynoppia
Corynoppia gamoensis

description: Description of Corynoppia gamoensis sp. nov.
(Figures 1, 2)
Type material. Holotype (female) and three paratypes (one male and two females): southern Ethiopia, South Ethiopia Regional State, Gamo Zone, 6°01’36.7’’N, 37°35’42.7’’E, 1170 m a.s.l., 5 km East from the town Arba Minch, 1 km from the lake Abai, mineral soil (0–5 cm) in a mixed forest on the terrace (first layer of forest: Celtis sp., Ficus sycomorus, Schefflera sp., Acacia sp.; second layer of forest: Lemon sp., Coffee arabica) on the brown (black-brown) soil with light-medium loam soil texture, 7.XII.2018, dry season (L.B. Rybalov).
Five paratypes (three males and two females): southern Ethiopia, South Ethiopia Regional State, Gamo Zone, 6°01’28.7’’N, 37°35’49.7’’E, 1179 m a.s.l., 5 km East from the town Arba Minch, 20–40 m from the lake Abai, mineral soil (0–5 cm) in a mixed deciduous forest on the alluvial organic soil, wet place, around water spots, 8.XII.2018, dry season (L.B. Rybalov).
The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany; eight paratypes are deposited in the collection of the University of Tyumen, Museum Zoology, Tyumen, Russia. All specimens are preserved in 70% solution of ethanol with a drop of glycerol.
Diagnosis. Body length: 270–300. Prodorsum with sparse tubercles; notogaster and anogenital region not tuberculate. Interbothridial region with three pairs of muscle sigillae. Rostral seta medium-sized, nearly setiform, barbed; lamellar and interlamellar setae medium-sized, broadly phylliform, barbed; bothridial seta long, with unilaterally fusiform and shortly ciliate head. Humeral tubercle developed. Notogastral seta c short, setiform, roughened, inserted on humeral tubercle; other notogastral setae medium-sized, broadly phylliform (sometimes some setae slightly bifid), barbed. Epimeral, genital and aggenital setae setiform, nearly smooth; both anal setae and adanal seta ad 3 setiform, slightly barbed; adanal setae ad 1 and ad 2 broadly phylliform (sometimes slightly bifid), barbed. Anterodorsal part of leg tibia IV with broad dilatation in males.
Description of adult. Measurements. Body length: 300 (holotype), 270–300 (male paratypes), 285–300 (female paratypes); notogastral width: 157 (holotype), 135–150 (male paratypes), 143–157 (female paratypes).
Integument (Figs 1A, C; 2B). Body color light brown to grayish. Body nearly smooth, but prodorsum and subcapitular mentum sparsely tuberculate; region between bothridium and acetabula I–III with typical dense tubercles; leg femora I–IV and trochanter III, IV partially densely tuberculate; all tubercles small (their diameter up to 2).
Prodorsum (Figs 1A, C). Rostrum broadly rounded. Costular-transcostular complex elongate trapezoid, poorly developed. Interbothridial longitudinal ridges and three pairs of muscle sigillae between them well visible. Lateral ridge medium-sized, slightly arch-like. Rostral seta (26–28) nearly setiform, barbed; lamellar and interlamellar setae (17–19) broadly phylliform, narrowed distally, barbed; exobothridial seta (5) setiform, roughened; bothridial seta (52–56) with long, smooth stalk and shorter, unilaterally fusiform and shortly ciliate head. Postbothridial tubercle present; slight tubercle-like thickening located opposite to postbothridial tubercle.
Notogaster (Figs 1A, C; 2A). Anterior margin of notogaster slightly convex and shortly interrupted medially. Humeral region with tubercle and crista. Notogastral seta c (5) setiform, roughened, inserted in medial part of humeral tubercle; other setae (22–26) broadly phylliform, narrowed distally, barbed; sometimes some setae slightly bifid. Opisthonotal gland opening and all lyrifissures well visible.
Gnathosoma (Figs 2B–D). Subcapitulum size: 60–64 × 45–49; subcapitular setae a (13–15) and h (13–15) setiform, roughened; m (15) setiform, barbed; all adoral setae (6) setiform, smooth. Palp length: 45–49; with typical setation: 0-2-1-3-9(+ω); postpalpal seta (4) spiniform, smooth. Chelicera length: 60–64; setae (cha: 19; chb: 13–15) setiform, barbed.
Epimeral and lateral podosomal regions (Figs 1B, C). Epimeres with typical epimeral setal formula (3-1-3-3); setae (11–15) setiform, nearly smooth. Discidium triangular, with rounded top.
Anogenital region (Figs 1B, C; 2A). With typical anogenital setal formula (5-1-2-3); genital (7–9) and aggenital (11–15) setae setiform, nearly smooth; both anal setae (19–22) and adanal seta ad 3 (22) setiform, slightly barbed; adanal setae ad 1 (22) and ad 2 (22) broadly phylliform, narrowed distally (sometimes slightly bifid), barbed. Adanal lyrifissure distinct, in typical position for genus (close and parallel to lateral side of anal plate).
Legs (Figs 2E–H). Claw of each leg smooth. Porose area on all leg segments not visible.Anterodorsal projection well developed on tibia I. Trochanter III with posterior tooth. Sexual dimorphism in morphology of tibia IV present: in males, anterodorsal part of segment with broad dilatation (Fig. 2H) versus in females, segment without dilatation. Formulas of leg setation and solenidia: I (1-5-2-4-20) [1-2-2], II (1-5-2-4-16) [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; seta s on tarsus I eupathidial; some setae narrowly or broadly phylliform; solenidion ω 2 on tarsus I rod-like; φ 1 on tibia I subflagellate; other solenidia nearly thickened, rounded distally.
Remarks. Corynoppia gamoensis sp. nov. is similar is similar to C. weigmanni (Murvanidze & Behan-Pelletier, 2011) from Caucasus in the presence of the unilaterally fusiform bothridial seta and medium-sized, broadly phylliform interlamellar seta. However, the new species differs from the latter by the morphology of the adanal seta ad 2 (phylliform versus setiform), the morphology and location of the notogastral seta c (setiform, inserted on humeral tubercle versus phylliform, inserted medial to humeral tubercle), the number of the interbothridial muscle sigillae (three pairs versus two pairs), and the absence (versus presence) of the cerotegumental bands on the notogaster and in the anogenital region.
Etymology. The species name gamoensis refers to the place of origin, Gamo Zone.
description: Published as part of Ermilov, Sergey G., 2025, Taxonomic contribution to knowledge of the oribatid mite genera Corynoppia, Ramusella and Wallworkella (Acari, Oribatida, Oppiidae), pp. 353-370 in Zootaxa 5621 (3) on pages 355-358, DOI: 10.11646/zootaxa.5621.3.4, http://zenodo.org/record/15262822