Ribautia donatellae Pereira, Uliana & Minelli, 2006, n. sp.
Creators: name: Pereira, Luis A.
name: Uliana, Marco
name: Minelli, Alessandro
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Chilopoda
Geophilomorpha
Geophilidae
Ribautia
Ribautia donatellae

description: Ribautia donatellae n. sp.
(Figs. 30–71)
Diagnosis: A species of Ribautia with coxal organs opening independently on the coxopleura of last leg­bearing segment and last legs with tubercle­like praetarsus. Of the Neotropical species in the same genus, R. donatellae n. sp. shares most traits with R. ducalis Pereira, Minelli & Barbieri, 1995, R. onycophaena Pereira, Foddai & Minelli, 2000; R. rossi Chamberlin, 1957 and R. tropica (Brölemann, 1898). Characters in table 3 differentiate these five species.
For diagnostic characters of Neotropical species of Ribautia with coxal organs opening independently on the coxopleura, see also Pereira, Minelli & Barbieri (1995) and Pereira, Minelli & Foddai (1997, 2000).
Type material: Holotype ɗ (with 4+3 coxal organs), 49 pairs of legs, body length 19 mm, from Brazil: Amazonas: at Km 45, BR­174 near Manaus, sandy soil of primary whitesand shrubs (Campina) [K 11 CPA], 10.06.1987, J. Adis et al. leg. (INPA).
Other material examined: same locality, 10.06.1987, J. Adis et al. leg.: 1 ɗ, adult, 47 pairs of legs, body length 22 mm, 3+3 coxal organs; 1 ɗ, subadult, 49 pairs of legs, body length 14 mm, 3+3 coxal organs (INPA); 1 Ψ, subadult, 53 pairs of legs, body length 13 mm, 3+3 coxal organs (INPA); 1 Ψ, juvenile, 51 pairs of legs, body length 9 mm, 2+2 coxal organs (INPA).
Etymology: The species is dedicated to dr. Donatella Foddai, who was a very kind and active partner in our previous studies on Neotropical centipedes.
Description of ɗ holotype. 49 pairs of legs, body length 19 mm, maximum body width 0.5 mm. Colour (of preserved specimen in alcohol) pale ochre.
Antennae ca. 3.0 times as long as the cephalic plate, distally very slightly attenuate. Setae on a.a. I to VI of various length, few in number; those of remaining articles progressively shorter and more numerous towards the tip of the appendage (Fig. 30). Terminal a.a. with ca. 11 claviform sensilla on the external border and ca. 12 on the internal border (Fig. 31). Distal end of this a.a. with ca. five very small sensilla, apparently not split apically (Fig. 31). Ventral and dorsal surface of a.a. II, V, IX and XIII (Figs. 32– 33) with very small specialised sensilla. On the ventral side these sensilla are restricted to an internal latero­apical area and are represented by two different types: a and b. Type a sensilla are very thin and not divided apically, type b sensilla are thicker than type a, have two diminutive apical branches and are pale in colour (a, b, Fig. 32). Specialised sensilla on dorsal side restricted to a latero­apical area and of two types: a and b similar to those of ventral side (a, b, Fig. 33). Distribution of sensilla as in table 4.
Ribautia donatellae n. sp.
Cephalic plate subrectangular with curved sides, distinctly longer than wide (ratio 1.50:1). Shape and chaetotaxy as in Fig 34.
Clypeus: anterior part with two pairs of setae on the clypeal area, two setae on the middle and a seta on each side, remaining clypeal surface without setae (Fig. 35). Clypeal area very small, surface very densely reticulate (Fig. 36).
Labrum: mid­piece well developed and sclerotized, with four relatively short and sharply pointed teeth in the middle and 5+5 hyaline filaments at the sides. Side­pieces with 7+6 long hyaline filaments on the internal half and 3+3 very small sharply pointed hyaline teeth on the external half (Fig. 37).
Mandible: pectinate lamella with ca. 12 hyaline teeth (Fig. 38).
First maxillae without coxosternal lappets (Fig. 39); telopodites with rudimentary lappets (Fig. 40). Coxosternum without setae; median projections of coxosternum subtriangular, well­developed, with 3+4 large setae. Article II of telopodite with 2+2 ventral setae and 2+2 lateral sensilla (Fig. 39), dorsal surface apparently without sensilla.
Second maxillae: coxites with 5+5 setae near the internal margin and 3+4 sensilla near the external margin, medially joined through a narrow, hyaline and non­areolate membranous isthmus only (Fig. 39). Process of antero­internal corners of coxosternum inconspicuous (Fig. 41). Apical claw of telopodite well­developed, tip slightly curved inward (Fig. 42). Chaetotaxy of coxosternum and telopodites as in Figs. 39 and 42.
Forcipular segment: when closed, the telopodites reach the level of the anterior margin of the head or slightly project beyond. Forcipular tergum trapeziform; an irregular transverse row of ca. six setae on the middle, very few additional smaller setae dispersed on the remaining surface. Coxosternum with incomplete chitinous lines (Fig. 43). Telopodites: trochanteropraefemur apically with a conspicuous, subtriangular, deeply pigmented tooth; proximally and next to it there is a smaller, unpigmented, round­tipped projection. Femur and tibia without denticles. Tarsungulum basally with a well developed, deeply pigmented, subtriangular denticle; dorsal and ventral edges of the ungular blade inconspicuously serrulate (Fig. 44). Calyx of poison gland as in Figs. 44–45. Chaetotaxy of coxosternum and telopodites as in Fig. 43.
Walking legs: chaetotaxy uniform throughout the body length (Figs. 46–50). Claws with an anterior and a posterior ventrobasal spine (Fig. 51).
Sterna: pore fields on the second to the penultimate sternum. Fields undivided on sterna II–XVIII and XLIV–XLVIII, divided in two subsymmetrical areas on sterna XIX– XLIII. Form of fields changing along the trunk as in Figs. 52–59. Number of pores on selected sterna: on sternum II, 17 pores; on IX, 36; on XVIII, 25; on XIX, 9+8; on XLIII, 12+10; on XLIV, 21; on XLV, 27; on XLVIII, 12.
Last leg­bearing segment without pleurites at the sides of praetergum. Praesternum not divided along the sagittal plane; form and chaetotaxy of tergum and sternum as in Figs. 60–61. Coxopleura sligthly protruding at the distal ventral end, setae numerous on the distal internal edge, the remaining surface with few setae. Right coxopleuron with four single ('homogeneous') coxal organs (Figs. 61–63), left coxopleuron with three coxal organs (Fig. 61), opening near the membrane between coxopleuron and sternum (Figs. 61, 63). Last legs with seven podomeres, form and chaetotaxy as in Figs. 60–61. Praetarsus as a very small tubercle with a diminutive apical spine (Fig. 64).
Terminal segments: intermediate tergum with posterior margin convex, intermediate sternum and first genital sternum with posterior margin concave. Gonopods biarticulate, basal article with 6 setae, apical article with 6–7 setae (Figs. 65–66); penis with 3+2 dorsal apical setae (Fig. 67). Anal organs present (Figs. 61, 68).
Ψ (subadult specimen): 53 pairs of legs, body length 13 mm. All features similar to those in the ɗ except for the shape and hairiness of the last leg­bearing segment and terminal segments.
Last leg­bearing segment: form and chaetotaxy of tergum and sternum as in Figs. 69– 70. Coxopleura slightly protruding at the distal ventral end, setae small and numerous on the distal ventral edge, the remaining surface with few larger setae. Three single coxal organs on each coxopleuron (Figs. 69–70). Shape and chaetotaxy of the podomeres of last legs as in Figs. 69–71.
Terminal segments: shape and chaetotaxy as in Figs. 69–70.
Individual variation. In our small series, the ɗɗ have 47 or 49 pairs of legs, the ΨΨ 51 or 53. Adult and subadult ɗɗ have 4+3 or 3+3 coxal organs, the only subadult Ψ 3+3 coxal organs. No significant variation was detected in other characters.
description: Published as part of Pereira, Luis A., Uliana, Marco & Minelli, Alessandro, 2006, New species and new records of the genus Ribautia Brölemann, 1909 (Chilopoda: Geophilomorpha: Geophilidae) from South America, pp. 45-68 in Zootaxa 1106 on pages 55-66, DOI: 10.5281/zenodo.171440