Endonura gracilirostris, Smolis, Adrian, Skarżyński, Dariusz, Pomorski, Romuald J. & Kaprus’, Ighor J., 2007

Smolis, Adrian, Skarżyński, Dariusz, Pomorski, Romuald J. & Kaprus’, Ighor J., 2007, Redescription of Endonura taurica (Stach, 1951) and E. quadriseta Cassagnau & Péja, 1979, and description of two new species of the genus Endonura Cassagnau, 1979 (Collembola: Neanuridae: Neanurinae) from the Crimea (Ukraine), Zootaxa 1442, pp. 19-35 : 24-25

Endonura gracilirostris sp. nov.

Figs 15–26 , Tab. 2

Diagnosis. Habitus typical of the genus Endonura . Dorsal tubercles present, well developed. 2+2 eyes present. Buccal cone strongly elongated. Labral chaetotaxy 0/2, 4. Mandible thin with 4 teeth. Head with 3 chaetae Oc, chaetae A, B, C, D, E (chaeta O present or absent). Tubercle (L+So) on head with 9 chaetae. Tubercles De on thoracic terga II and III with 3 and 4 chaetae respectively. Tubecles L on abd. III and IV with 4 and 6–7 chaetae respectively. Claw without tooth. Tibiotarsi I, II with long chaetae B5 and B4. Tibiotarsus III with only one long chaeta B4.

Material examined. Type material. Holotype, adult female on slide, soil and leaf litter in mixed forest, Jaltyns’kyi Reserve, neighborhood of Jalta, Crimea, Ukraine, 11.IX.1997, leg. R. J. Pomorski, D. SkarŻyński, I. Kaprus’. Paratypes: adult female and 2 males on slides, the same data as holotype. Other material. adult female on slide, leaf litter in beech forest, ca. 800 m a.s.l., Partyzans’ke near Gurzuf, Crimea, 10.IX.1997, leg. R. J. Pomorski, D. SkarŻyński, I. Kaprus’. (holotype, 3 paratypes and other material ZIWU, 1 paratype MNHL).

Etymology. The species name is derived from the Latin words “gracilis” – slender and “rostrum” - bill. It refers to the shape of buccal cone of the new species.

Description. Habitus typical of the genus ( Fig. 15 ). Body length (without antennae) 1.16–1.45 mm. Colour of the body greyish-blue. 2+2 medium, dark-pigmented eyes.

Types of dorsal ordinary chaetae: macrochaetae Ml and Mc thickened, narrowly sheathed, distinctly serrated and not pointed ( Figs 15 , 23, 26 ); mesochaetae thin and pointed.

Head. Buccal cone strongly elongate. Labrum pointed, with ventral sclerifications ogival as in Fig. 17 . Labrum chaetotaxy 0/2, 4 ( Fig. 18 ), Chaetotaxy of labium as in Fig. 17 and Tab. 2 . Maxilla styliform, mandible thin with 2 basal and 2 apical teeth ( Fig. 16 ). Chaetotaxy of antennae as in Tab. 2 . Apical vesicle distinct, trilobed. S-chaetae subequal, long and moderately thickened. Chaetotaxy of head as in Figs 15 , 20 and Tab. 2 . Chaeta D free ( Figs 15 , 20 ).Tubercle Af wide ( Fig. 20 ), with or without chaeta O. Tubercle (L+So) with 9 chaetae (chaeta So2 absent).

Thorax, abdomen, legs. Chaetotaxy of th. and abd. as in Figs 15, 19 , 23 and Tab. 2 . Tubercles Di on th.I not differentiated ( Fig. 15 ). Tubercles L on abd. III and IV with 3 and 6–7 chaetae respectively ( Fig. 19 ). Cryptopygy absent. Chaetotaxy of legs as in Figs 21–22, 24–25 and Tab. 2 . Claw without tooth ( Figs 21–22, 24–25 ). Tibiotarsi I and II with elongate and slightly clavate chaetae B5 and B4. Tibiotarsi III with elongate and slightly clavate chaeta B4.

Discussion. The new species is the most similar to E. taurica (Stach, 1951) , but differs from it in the following characters: buccal cone elongate (in taurica short), labrum with ventral sclerifications ogival (in taurica nonogival), labrum without prelabral chaetae (in taurica present) and mandible thin (in taurica thick).

Tubercle Number of chaetae Types of chaetae Names of chaetae Cl 4 Ml F

Mc G

Number of other cephalic chaetae: Vi, 6; Ve, 10–11; labrum, 0/2, 4; labium, 11, 0x; ant. I, 7; ant.II, 11; ant. III, 18+5s; ant. IV, 8S+i +or+12mou.

b) Postcephalic chaetotaxy.

abd. II 2 3+ s 2 3 Ve: 5 Ve1 present

Figures

FIGURES 15 – 19. Endonura gracilirostris sp. nov.: 15, habitus and dorsal chaetotaxy; 16, mandible; 17, chaetotaxy of labium and group Vi; 18, chaetotaxy of labrum; 19, ventral chaetotaxy of abd. II – VI.

FIGURES 20 – 26. Endonura gracilirostris sp. nov.: 20, dorsal chaetotaxy of head; 21, tibiotarsus and claw III (ventrolateral view); 22, tibiotarsus and claw III (dorsolateral view); 23, dorsal chaetotaxy of abd. V – VI; 24, tibiotarsus and claw I (dorsolateral view); 25, tibiotarsus and claw I (ventrolateral view); 26, chaeta Di 1 of abd. V.

Tables

TABLE 2. Chaetotaxy of Endonura gracilirostris sp. nov .. a) Cephalic chaetotaxy.

Af Oc Di	11 3 2	Ml Mc me Ml Mc me Ml me	B A,O,C, E D Ocm Ocp Oca Di1 Di2
De	2	Ml me	De1 De2
Dl	6	Ml Mc me	Dl1,Dl5 Dl3,Dl4 Dl2,Dl6
(L+So)	9	Ml Mc me	L1,L4,So1 L2 L3,So3–6