Paravietnura rostrata, Smolis & Skarżyński, 2020
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publication ID |
https://dx.doi.org/10.3897/zookeys.992.56921 |
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publication LSID |
lsid:zoobank.org:pub:F143D360-4A50-4567-AEBC-4F7425D6FEC0 |
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persistent identifier |
https://treatment.plazi.org/id/E4B57858-235D-4FCC-99D6-A7AFBE6848A7 |
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taxon LSID |
lsid:zoobank.org:act:E4B57858-235D-4FCC-99D6-A7AFBE6848A7 |
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treatment provided by |
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scientific name |
Paravietnura rostrata |
| status |
sp. nov. |
Paravietnura rostrata sp. nov. Figs 72-82 View Figures 72–82 , Tables 19, 20, 21
Type material.
Holotype: juvenile (second instar) on slide, Iran, Gilan Province, Shahrbijar, tree hole, humus, sifting, 6.IX.1973, leg. A. Senglet, sample 7366.
Etymology.
The name of the new species referring to its exceptionally-long buccal cone.
Diagnosis.
Habitus typical of the genus Paravietnura with stumpy and short body. Macrochaetae long thick and widely sheathed. 2+2 large pigmented eyes. Buccal cone extremely long and narrow, labrum with ogival sclerifications. Tubercle (Af + 2Oc) with chaetae B and Ocm, chaetae A and Ocp absent. Tubercle Cl without chaetae G. Tubercle (Dl+L+So) with 9 chaetae. Furca rudimentary with minute and difficult microchaetae, without chaetopores.
Description.
General. Body length (without antennae): holotype: 0.45 mm. Colour of the body bluish. 2+2 large black eyes, in a typical arrangement for the genus (Fig. 75 View Figures 72–82 ).
Chaetal morphology. Dorsal ordinary chaetae of five types: long macrochaetae (Ml), short macrochaetae (Mc), very short macrochaetae (Mcc), mesochaetae and microchaetae. Long macrochaetae thickened, arc-like, widely sheathed, strongly serrated, apically rounded (Figs 75 View Figures 72–82 , 79 View Figures 72–82 , 81 View Figures 72–82 ). Macrochaetae Mc and Mcc morphologically similar to long macrochaetae, but much shorter (Figs 75 View Figures 72–82 , 79 View Figures 72–82 ). Mesochaetae similar to ventral chaetae, thin, smooth and pointed. Microchaetae similar to mesochaetae, but clearly shorter (Figs 75 View Figures 72–82 , 79 View Figures 72–82 ). S-chaetae of terga thin, smooth and short, shorter than nearby macrochaetae (Figs 75 View Figures 72–82 , 79 View Figures 72–82 , 82 View Figures 72–82 ).
Antennae. Typical of the genus. Dorsal and ventral chaetotaxy of Ant. III-IV as in Figs 72-74 View Figures 72–82 and Table 20 View Table 20 . S-chaetae of Ant. IV relatively short and thin (Fig. 72 View Figures 72–82 ), sensillum sgd of medium size and straight (Fig. 73 View Figures 72–82 ), sensillum sgv relatively long and slightly s-shaped (Fig. 74 View Figures 72–82 ). Apical vesicle distinct, bilobate (Fig. 72 View Figures 72–82 ).
Mouthparts. Buccal cone extremely elongated with labral sclerifications ogival (Figs 76 View Figures 72–82 , 77 View Figures 72–82 ). Labrum chaetotaxy: 0/2, 4, without prelabral chaetae (Fig. 76 View Figures 72–82 ). Labium with three basal, three distal and two lateral chaetae, papillae x absent (Fig. 77 View Figures 72–82 ). Maxilla styliform mandible thin and tridentate.
Dorsal chaetotaxy and tubercles. Chaetotaxy of head as in Fig. 75 View Figures 72–82 and Table 19 View Table 19 . Chaetotaxy of Th. and Abd. As in Figs 75 View Figures 72–82 , 79 View Figures 72–82 and Table 21 View Table 21 . On Th. I, tubercle De with one chaeta (Fig. 75 View Figures 72–82 ). On Th. II and III, chaetae Di 3 absent. Th. II and III with two chaetae De (Fig. 75 View Figures 72–82 ). On Abd. IV, chaetae Di1 distinctly longer than Abd. V (Fig. 79 View Figures 72–82 ). On Abd. V, chaetae Di2 and Di3 absent. Tubercle Di of Abd. IV partially fused (Fig. 79 View Figures 72–82 ). Cryptopygy present and strongly developed, Abd. VI invisible from above (Fig. 79 View Figures 72–82 ).
Ventral chaetotaxy. On head, groups Vea, Vem and Vep with 3, 2 and 4 chaetae, respectively. Group Vi on head with 5 chaetae (Fig. 77 View Figures 72–82 ). On Abd. IV, furca rudimentary with 4 minute microchaetae and 4 mesochaetae (Fig. 78 View Figures 72–82 ). On Abd. V, chaetae Vl present and L’ absent.
Legs. Chaetotaxy of legs as in Table 21 View Table 21 . Claw without internal tooth (Fig. 80 View Figures 72–82 ). On tibiotarsi, chaeta M present and chaetae B4 and B5 of medium size and pointed.
Remarks.
No doubt, the new species is the third member of the remarkable Neanurinae genus Paravietnura Smolis & Kuznetsova, 2018 described recently from the Caucasus ( Smolis and Kuznetsova 2018). Paravietnura rostrata sp. nov. seems to be the closest to P. notabilis Smolis & Kuznetsova, 2018; however, it can be easily separated from the mentioned species because of the reduction of its cephalic chaetotaxy (in rostrata , chaetae G and Ocp absent, in notabilis , present), extremely elongated labrum, which is well visible from above (in notabilis , feebly elongated and practically invisible from above), absence of prelabral chaetae (in notabilis , 2 chaetae present), the presence of 1+1 chaetae De on Th. I (in notabilis , 2+2 chaetae present), the absence of chaetae Di3 on Th. (in notabilis , present), reduction of the number of chaetae De on Th. II and III (in rostrata , 1+s chaetae, in notabilis , 2+s and 3+s chaetae, respectively), the absence of chaetae De2 and De3 on Abd. I-III (in notabilis , present), the fusion of tubercles Di on Abd. IV (in notabilis , not fused) and the presence of 1 chaeta Di on Abd. V (in notabilis , 3 chaetae Di present).
New Records
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