On the identity of some poorly known species of the genus Endonura Cassagnau, 1979 (Collembola, Neanuridae, Neanurinae) Author Smolis, Adrian text Zootaxa 2016 4173 3 237 250 journal article 38075 10.11646/zootaxa.4173.3.3 e527922c-08e3-4bfe-b695-23cbf865770c 1175-5326 159328 EFD18D41-F846-495C-9831-60C1423A4B2C Endonura caeca ( Gisin, 1963 ) Figs 19–24 , Tab. 4 Neanura caeca : Gisin 1963 : 3 . Type material . Holotype : adult male on slide, Bosnia and Herzegovina , Igman , Veliko Polje , 1200 m a. s. l. , spruce forest Piceetum excelsae , 9.III.1961 . leg. H. Gisin ( MHNG ). Diagnosis. Habitus typical of the genus Endonura . Dorsal tubercles present and well developed. Eyes absent. Buccal cone short, labrum nonogival. Head with chaetae A, B, C, D, E, O, F and G. Tubercles Cl and Af separate. Tubercles Dl and (L+So) on head with 3 and 9 chaetae respectively. Tuberles Di on th. I present. Tubercles De on th. II and III with 3 and 4 chaetae respectively. Tubercles L on abd. III and IV with 3 and 6 chaetae respectively. Abd. IV and V with 8 and 3 tubercles respectively. Claw without inner tooth. Redescription . Habitus typical of the genus. Body length of holotype (without antennae): 0.6 mm. Colour of the body white, eyes absent ( Fig. 19 ). Types of dorsal ordinary chaetae. Macrochaetae Ml thickened, short, straight, narrowly sheathed, feebly serrated, apically rounded or pointed ( Figs 19, 23–24 ); macrochaetae Mc and Mcc thickened, straight, pointed or rounded at apex; mesochaetae and microchaetae short, thin and pointed. Head. Buccal cone short with labral sclerifications nonogival ( Fig. 20 ). Labral and labial chaetotaxy impossible to recognize. Maxilla and mandible invisible. Dorsal chaetotaxy of ant. III and IV as in Fig. 21 . Schaetae of ant. IV of medium length and thickened, S1 and S2 slightly thinner than others. Apical vesicle unilobed ( Fig. 22 ). Chaetotaxy of other part of antennae impossible to recognize. Chaetotaxy of head as in Tab. 4 a and Fig. 19 . Tubercles Cl and Af separate. Chaetae D connected with tubercle Cl, chaeta E free. Tubercle Dl with 3 chaetae, chaetae Dl2–3 and Dl6 absent ( Fig. 19 ). Tubercle (L+So) with 9 chaetae, chaeta So2 absent. Elementary tubercle BE absent ( Fig. 19 ). Chaeta A shorter than B. Chaetae Ocp longer than A. Thorax, abdomen, legs. Body s-chaetae thin and smooth, shorter than nearby macrochaetae ( Fig. 23 ). Chaetotaxy of th. and abd. as in Tab. 3 b and in Figs 19, 23–24 . Tubercles Di on th. I well developed, not fused with De ( Fig. 19 ). Chaetae De2 on th. II–III and De3 on th. III connected with tubercle De. Chaetae De3 on abd. I–III connected with tubercle De ( Fig. 23 ). Chaetae De2 on th. III and abd. I–III nearly equal chaetae De3. The line of chaetae De1–chaeta s perpendicular to the dorsomedian line on abd. I–III. Tubercles Di on abd. V fused ( Fig. 24 ). Tubercle L on abd. IV with 6 chaetae. No cryptopygy. Chaetotaxy of ventral side of abdomen and legs impossible to recognize. Discussion . Among eyeless species of the genus, E . caeca is most similar to E . arbasensis Deharveng, 1979 (known from France and Spain , Deharveng 1979 , Jordana et al . 1997 ), particularly in having an unpigmented body and complete chaetotaxy of central area of head. However, they differ in numerous details, including the number of chaetae Dl and (L+So) (in caeca 3 and 9 respectively, in arbasensis 6 and 10), the presence/absence of free chaetae De on th. III and abd. I–III (in caeca absent, in arbasensis present), the number of chaetae L on abd. IV (in caeca 6, in arbasensis 7) and the number of ordinary chaetae (De+Dl+L) of abd. V (in caeca 5, in arbasensis 7).