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﻿The second species of the genus Ivoria Kontschán, 2019: description of Ivoriaalourouai sp. nov. from Ivory Coast (Acari, Mesostigmata, Urodinychidae)

﻿Abstract A new Ivoria species (Ivoriaalourouaisp. nov.) is described from Ivory Coast based on five females. The new species differs from the previously described congener (Ivoriataienesis Kontschán, 2019) based on the shape of female genital shield, dorsal setae, centro-caudal part of the marginal shield and peritremes.


Introduction
Uropodina are a very diverse group of soil-inhabiting mites, especially in tropical rainforests (Lindquist et al. 2009). Despite this high diversity, these mites remain poorly investigated in many tropical countries, like Ivory Coast, from where only nine species have been reported from the genera Trichouropoda Berlese, 1916sensu lato, Uroobovella Berlese, 1903 sensu lato (Wiśniewski 1993) and Rotundabaloghia Hirschmann, 1975(Kontschán 2009), Ivoria Kontschán, 2019, Mahnertellina Kontschán, 2020and Origmatrachis Hirschmann, 1979 (Kontschán 2019(Kontschán , 2020a. The genus Ivoria was described from Taï National Park in Ivory Coast (Kontschán 2019), which contains one of the largest primary rainforests in West Africa. In recent years, the first author spent numerous weeks in the Natural History Museum of Geneva to study the Uropodina mite diversity of the tropical soils. During the investigation of the West African soil samples, the second species of Ivoria was discovered from Taï National Park in a disturbed area close to the village Dropleu. This new species is described in this paper.

Materials and methods
Specimens were cleared in lactic acid for a week and investigated with a Leica 1000 scientific microscope with a drawing tube. The photos were taken with a Keyence 5000 digital microscope. Specimens examined were stored in 70% ethanol and deposited in the Natural History Museum, Geneva (NHMG). Measurements are given in micrometers (μm).

Abbreviations
Setae and pores: st1 -5 sternal setae; h1-h4 hypostomal setae; p pores.  Kontschán, 2019 Diagnosis. Idiosoma subpentagonal, dorsally domed, marginal and dorsal shields fused anteriorly. All dorsal setae short, with pilose or serrate distal margins. Five pairs of sternal setae smooth or pilose. Genital shield of female subtriangular. Peritreme L-shaped or hook-shaped. Tritosternum with vase-like base, apically serrate, laciniae subdivided into two pairs of short lateral and one pair of long central branches. Hypostomal setae h1 robust, basally with lateral teeth, h2, h3, and h4 narrow and marginally serrate. Palptrochanter setae v1 robust and serrate, v2 situated on small protuberance and divided into a short smooth and a long, basally serrate and apically pilose branches. Corniculi small and horn-like, situated at posterior level of h2. Internal malae long and smooth. Chelicerae large and robust with internal sclerotized nodes, movable digit shorter than fixed digit, both digits bearing a large central tooth in addition to smaller subapical teeth. Leg I without ambulacral claws; majority of leg setae marginally pilose.

Taxonomy
Remarks. The robust and large chelicerae occur only in some genera within the Uropodina. The following genera Baloghjkaszabia Hirschmann, 1973, Kaszabjbaloghia Hirschmann, 1973, Wernerhirschmannia Hiramatsu, 1983, Multidenturopoda Wiśniewski & Hirschmann, 1991, Bloszykiella Kontschán, 2010, Editella Kontschán, 2011and Jedediella Kontschán & Starý, 2012 have large and robust chelicerae; the most important differences among them are summarized in Kontschán (2019: table 1). Unfortunately, families of Uropodina are not well defined, and the classification system of Uropodina is confusing, so it is questionable which genera belong to the family Urodinychidae. The chelicerae of the other members (like species of the genus Uroobovella sensu lato) in the family Urodinychidae are small, narrow, and usually have a shorter or longer apical prolongation on the fixed digit.
Diagnosis. Idiosoma subpentagonal, dorsally domed, marginal and dorsal shields fused anteriorly. All dorsal setae short, with pilose margins. Five pairs of sternal setae pilose. Genital shield of female triangular, anterior margin rounded and situated between coxae IV. Peritreme hook-shaped. Tritosternum with vase-like base, apically serrate, its laciniae subdivided into two pairs of short lateral branches and one pair of long central branches. Hypostomal setae h1 robust, with a short lateral branch and with numerous lateral teeth, h2, h3, and h4 narrow and marginally serrate. Palptrochanter setae v1 robust and serrate, v2 situated on small protuberance, basally serrate and apically pilose. Internal malae long and smooth with a short lateral branch.
Etymology. The name of the new species is dedicated to Alouroua the mythical creator of the Akan (Baoule) people who are the major cultural group of the Ivory Coast.
Remarks. Until now, only one species had been described from this poorly-known genus. The differences between of the two species are summarized in Table 1.

Discussion
The genus Ivoria seems to be a rare, endemic genus in the West African region. The two known species occur only in Ivory Coast. The Uropodina fauna and the distribution of the known species are very poorly investigated in this region, therefore discovery of numerous additional species might be expected. A similar situation exists for the East African Uropodina genus Bloszykiella (Kontschán and Ermilov 2020).