Urodepressa guatemalaensis Kontschán 2018, sp. nov.
Creators: name: Kontschán, Jenö
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Urodinychidae
Urodepressa
Urodepressa guatemalaensis

description: Urodepressa guatemalaensis sp. nov.
Figs 1-16
Holotype: MHNG; female; Guatemala, Tikal (app. Winkler); 28-29 December 1975; leg. A. de Chambrier.
Paratypes: MHNG; two females and seven males with same data as for holotype.
Diagnosis: See diagnosis of genus.
Description of females: Length of idiosoma 370- 410, width 340-350 (n=3). Idiosoma subpentagonal, with anterior vertex and humeral projections. Posterior margin with deep and concave incision. Color yellowish brown.
Dorsal side of idiosoma (Fig. 1): Seven pairs of short (about 22-42), phylliform and marginally serrate setae placed on anterior margin dorsal shield. Eight pairs of longer (about 60-120), narrow and marginally serrate setae in groups (2-4-2) situated on lateral, caudal-lateral margins of dorsal shield and caudal part of marginal shield. A large, rectangular depression (about 110- 120×130-145) situated in central area of dorsal shield. Anterior part of dorsal depression shallow, with small oval pits on its surface; posterior part deeper, with posterior margin reversely U-shaped. Medial posteriormost surface with flat elevation bearing two small triangular structures. Dorsal surface of elevated region bearing three pairs of short (about 18-25), phyliform marginal setae and covered by web-like sculptural pattern. Surface of anterior area of dorsal shield covered by reticulate sculptural pattern. Marginal shield with numerous (20- 21) short (about 30-40), phyliform marginal setae, its surface covered by reticulate sculptural pattern, setae j1 longer and wider (about 55-60) than other setae on marginal shield (Fig. 2).
Ventral side of idiosoma (Fig. 4): Base of tritosternum narrow, with two anterolateral spines; tritosternal laciniae three-tined, tines smooth and pointed, central tine moderately elongate (Fig. 9). Sternal shield without sculptural pattern. All sternal setae short (about 6-8), smooth and needle-like. Sternal setae St1 situated close to anterior margin of sternal shield, St2 at level of central area of coxae II, St3 at level of anterior margin of coxae III, St4 at level of anterior margin of coxae IV and St5 at level of central area of coxae IV. One pair of lyriform fissures situated close to St1, one pair of pores placed close to first pair of needle-like ventral setae. Two pairs of ventral setae posterior to genital shield minute (about 7-10), smooth and needle-like, other ventral setae longer (about 25-35), slightly broadened medially, phylliform, with marginal serration (Fig. 5). Surface of ventral shield covered by reticulate sculptural pattern. Anal opening small (about 9-10×6-7), two pairs of adanal setae minute (about 4-6), smooth and needle-like. Postanal seta absent. Genital shield large (about 110-120×80- 85), scutiform, with reticulate surface and with a large, hook-like anterior process (Figs 6-8). Stigmata situated between coxae II and III. Prestigmatic part of peritremes V-shaped, poststigmatic part absent (Fig. 3). Pedofossae relatively deep, their surface smooth.
Gnathosoma (Fig. 9): Corniculi horn-like, internal malae twice as long as corniculi and apically pilose. Hypostomal setae h1 longer (about 26-28 in length), smooth and needle-like; h2 shorter (about 14-16), robust and laterally with one pair of subapical spines; h3 narrower (about 16- 18 in length), with unpaired subapical spine; h4 robust (about 17-20 in length), with distal lateral margins well spinate. Palp trochanter bearing two ventral seta with serrate margins. Other setae on palp smooth and needlelike. Epistome lanceolate, densely serrate on lateral margins (Fig. 11). Chelicerae with one tooth on fixed digit, fixed digit longer than movable digit, one pit-like sensory organ situated in central part of movable digit and one on apical part of fixed digit. Internal sclerotized node present (Fig. 10).
Legs (Figs 12-15): Leg I 240-250 long, leg II 270-280, leg III 240-255, leg IV 230-240. Legs I without claws. Most setae on legs needle-like, a few spine-like and serrate setae present on all legs.
Description of males: Length of idiosoma 410-430, width 340-370 (n=6). Shape same as in females.
Dorsal side of idiosoma: Ornamentation and chaetotaxy of dorsal shield as in female.
Ventral side of idiosoma: Ornamentation and chaetotaxy of ventral shield as in female. Sternal shield without sculptural pattern (Fig. 16). Sternal setae smooth and needle-like (about 5-7 long), St1 situated close to anterior margins of sternal shield, St2 at level of posterior margin of coxae II, St3 at level of central area of coxae III, St4 and St5 situated lateral to genital shield. One pair of pores situated between St2 and St3, two pairs of lyriform fissures close to St4 and two other pairs close to first needle-like ventral setae. Genital shield rounded, slightly wider than long (about 45-48× 50-55 in dimension) and situated between coxae IV. Other characters as in female. Larva and nymphs unknown.
Etymology: The name of the new species refers to the country where the type specimens were collected.
description: Published as part of Kontschán, Jenö, 2018, Urodepressa guatemalaensis gen. nov, sp. nov., a new remarkable genus and species from Guatemala (Acari: Uropodina: Urodinychidae), pp. 239-243 in Revue suisse de Zoologie 125 (2) on pages 240-243, DOI: 10.5281/zenodo.1414211