Rhynchocyrtus klausi, Mendoça, Maria Cleide De & Fernandes, Liliane Henriques, 2007

Mendoça, Maria Cleide De & Fernandes, Liliane Henriques, 2007, Rhynchocyrtus gen. nov. (Collembola, Entomobryidae) from the Southeast and Northeast Brazilian regions, Zootaxa 1660, pp. 45-51 : 46-50

Rhynchocyrtus klausi sp. nov.

Figs 1–19 , 24–25

Description. Total body length up to 1.59 mm. Body covered with ciliated setae and hyaline and striated scales. Pale color with blue diffuse pigment areas in the antennal segments, ocular spot, lateral surface of the head and intersegmental region of the thorax III and abdominal I. Pigment more concentrated between the antennae, inverted V-shaped, on the lateral borders of the thoracic segments and of the abdominal segments I and II, two semi-circular spot in the dorsolateral region of the abdominal segment IV. Antennae slightly longer than the cephalic diagonal and only covered with ciliated setae; ratio antennae: cephalic diagonal = 1.3:1; ratio of antennal segments I:II:III:IV = 1:1.7:1.5:2.8. Antennal segment IV without apical bulb, with about 40 thin sensilla, distributed among ciliated setae from various lengths ( Fig. 1 ). Organ on antennal segment III formed by two curved subcylindrical sensilla and protected by two lateral sensilla and one dorsolateral sensillum ( Fig. 2 ). Antennal segment II with 8–10 sensilla on sub apical region and two basal microchaetae. Antennal segment I with three basal microchaetae on dorsal surface ( Fig. 3 ).

Elongated anterior part of the head covered with ciliated setae and small rounded scales. Labral chaetotaxy with 4/554 ciliated setae, apex of labrum with 4 rounded papillae ( Fig. 4 ). Five labial papillae present. Smooth labial setae, one seta M and seta r vestigial ( Fig. 5 ). Linea ventralis with 4+4-5+5 ciliated setae. Elongated mandible with 5 apical teeth, pars molaris with 2–3 series conical teeth and apical part with innumerous denticles ( Fig. 6 ); maxilla head with thin bidentate ungulum and with only three lobed, smooth lamellae without fringes ( Fig. 7 ); smooth and subequal setae of maxillary palp ( Fig. 8 ). Ocular spot rounded and strongly pigmented with 8+8 eyes, G and H small; interocular chaetotaxy as in Fig. 9 ; the row of setae between eyes and the ocular spot represented by 20 macrochaetae ( Fig. 4 ).

Scaleless legs with ciliated setae. Trochanteral organ V-shaped with about 11 smooth setae ( Fig. 10 ). Tibiotarsi I–III with one long and spatulate tenent hair each; claws with 2 proximal teeth in inner margin and 1 subapical tooth; empodium lanceolated; ratio claw: empodium= 1.4:1 ( Fig. 11 ). Apical face of collophore with 7–9 ciliated setae; basal face with 15+15 long and ciliated setae ( Fig. 12 ). Tenaculum with 4+4 teeth and long ciliated seta ( Fig. 13 ).

Thorax II to abdomen IV with pseudopores; abomen II with two bothriotrichia and one macrochaeta; abdomen III with three bothriotrichia and three macrochaetae; abdomen IV with two bothriotrichia and 18 macrochaetae arranged as in Figs 14–17 . Macrochaetae on the head only in the anterior region.

Manubrium with rounded scales and setae in ventral face and only setae in dorsal face ( Fig. 18 ). Dens with apically rounded tubercle in basal region, elongated scales and ciliated setae along ventral face ( Figs 19– 20 ). Mucro with two teeth and basal setae without spine ( Fig. 20 ); ratio manubrium: dens: mucro= 1:1:0,05.

Type locality. National Park of Tijuca, Rio de Janeiro city, Rio de Janeiro State, Brazil. Found in litter and soil.

Type material. Brazil, Rio de Janeiro State, Rio de Janeiro city, National Park of Tijuca, holotype male on slide Nº 1674, 08.iii.2007, M. C. Mendonça, coll.; two paratypes on slide Nº 53 CM/ MNRJ, 22.ii.1979, M. C. Mendonça, coll.; one paratype on slide Nº 56 CM/ MNRJ; one paratype on slide Nº 57 CM/ MNRJ, 10.iv.1979, M. C. Mendonça, coll.; one paratype on slide Nº 62 CM/ MNRJ, 02.v.1979, M. C. Mendonça, coll.; one paratype on slide Nº 64 CM/ MNRJ; two paratypes on slide Nº 68 CM/ MNRJ, 23.iv.1979, M. C. Mendonça, coll.; five paratypes on slide Nº 90 CM/ MNRJ, 29.viii.1979, M. C. Mendonça, coll.; ten paratypes on slide Nº 102 CM/ MNRJ, 03.i.1980, M. C. Mendonça, coll.; one paratype on slide Nº 118 CM/ MNRJ; two paratypes on slide Nº 122 CM/ MNRJ; two paratypes on slide Nº 123, 07.ii.1980, M. C. Mendonça, coll.; one paratype on slide Nº 259 CM/ MNRJ, 26.viii.1988, M. C. Mendonça, coll.; one paratype on slide Nº 388 CM/ MNRJ; ten paratypes in alcohol and three paratypes on slide Nº 394 CM/ MNRJ, v.1992, M. C. Mendonça, coll.; three paratypes on slide Nº 1220 CM/ MNRJ, 19.ix.2002, M. C. Mendonça, coll.; two paratypes on slide Nº 1670 CM/ MNRJ; one paratype on slide Nº 1673 CM/ MNRJ, 08.iii.2007, M. C. Mendonça coll.; one paratype on slide Nº 110 CM/ MNRJ; three paratypes on slide Nº 111 CM/ MNRJ, 23.v.1979, Castelo-Branco H. coll.; four paratypes on slide Nº 305 CM/ MNRJ, 23.v.1990, P. Magno coll.

Other material. Brazil, Rio de Janeiro State, Niterói city, State Park of Serra da Tiririca, found in litter and soil, 30.i.2002, S. P. Azevedo & J. D. C. Souza coll.: two specimens on slide Nº 1155 CM/ MNRJ; Rio de Janeiro State, Maricá city, Restinga de Maricá, found in sand dunes, 11.viii.2006, A.N. Bernardo coll.: one specimen on slide Nº 1611 CM/ MNRJ.

Remarks. Rhynchocyrtus klausi gen. nov. sp. nov, widely distributed throughout forest litter and soil, was also found in sand dunes in the restinga ecosystem. Another species of the new genus, that will be described later, was collected from remnant Atlantic rainforest soil in Pernambuco State, in the Northeast Brazilian region, 2300 km far from Rio de Janeiro State as well as in the Southeast Brazilian region, extending the genus occurrence area ( Fig. 21 ). The species from the Northeast region shows the same mouth structure but it has the different color pattern ( Figs 22–23 ) than Rhynchocyrtus klausi gen. nov. sp. nov. described and illustrated here ( Figs 24–25 ).

Etymology. This species is kindly dedicated to our colleague Dr. Klaus Dieter Sautter.

Figures

FIGURES 1 - 11. Rhynchocyrtus klausi gen. nov. sp. nov.: 1, antennal segment IV; 2, antennal segment III; 3, antennal segment I; 4, labral chaetotaxy and frontal macrochaetotaxy of the head; 5, labial chaetotaxy; 6, mandibles; 7, maxilla; 8, maxillary palp; 9, eyes and interocular setae; 10, trochanteral organ; 11, distal part of the tibiotarsus and claw of the leg III.

FIGURES 12 – 20. Rhynchocyrtus klausi gen. nov. sp. nov.: 12,. Collophore. 13. Tenaculum. 14. Distribution of pseudopores, trichobotriae and macrochaetae. 15. Trichobothrial complex of the abdominal segment II. 16. Trichobothrial complex of the abdominal segment III. 17. Trichobothrial complex of the abdominal segment IV. 18. Dorsal view of the manubrium. 19. Dental tubercle and some neighboring setae. 20. Distal part of the dens and mucro.

FIGURES 21 – 25. Rhynchocyrtus gen. nov.: 21, distribution of the new species of Rhynchocyrtus gen. nov. from Brazil; 22 – 23, habitus and cephalic lateral view of Rhynchocyrtus sp.; 24 – 25, habitus and cephalic lateral view of Rhynchocyrtus klausi