Philotella, Najt & Weiner, 1985

Babenko, Anatoly, Shveenkova, Yulia & Potapov, Mikhail, 2022, New species of the genus Philotella Najt & Weiner, 1985 (Collembola, Neanuridae, Pseudachorutinae) from the Russian Far East, Zootaxa 5174 (5), pp. 525-550 : 547-549

publication ID	https://doi.org/ 10.11646/zootaxa.5174.5.3
publication LSID	lsid:zoobank.org:pub:6AA085AA-7466-4825-AE78-4BE7A2164308
DOI	https://doi.org/10.5281/zenodo.6993891
persistent identifier	https://treatment.plazi.org/id/B81687E9-F646-717D-EDD3-77A5FE9343EB
treatment provided by	Plazi
scientific name	Philotella
status

Treatment

A key to the East Palaearctic species of the genus Philotella View in CoL *

1 Th. II–III with 1+1 axial setae ( Fig. 58 View FIGURES 56–61 )........................................... japonica (Tamura) View in CoL comb. nov.

- Th. II–III with more axial setae.......................................................................... 2

2 Th. II–III with 3+3 axial setae (p2 present) ( Fig. 56 View FIGURES 56–61 )......................................................... 3

- Th. II–III with 2+2 axial setae (p2 absent) ( Fig. 57 View FIGURES 56–61 )......................................................... 12

3 Abd. I–III with 3+3 axial setae (p2 present) ( Fig. 59 View FIGURES 56–61 )......................................................... 4

- Abd. I–III with 2+2 axial setae (p2 absent) ( Fig. 60 View FIGURES 56–61 )......................................................... 7

4 Tibiotarsi with 18–18–17 setae, i.e. seta M absent ( Fig. 61 View FIGURES 56–61 ).................................. olgae Kniss & Thibaud View in CoL

- Tibiotarsi with 19–19–18 setae, i.e. seta M present.......................................................... 5 5 Dark coloured species with 5+5 ocelli; dorsolateral group on Th. II–III with two ordinary setae additionally to sensillum ( Fig. 62 View FIGURES 62–65 ); Abd. I–III with one seta between axial group and sensillum ( Fig. 64 View FIGURES 62–65 )............................ obesa Babenko View in CoL

- White species with or without ocelli; dorsolateral group on Th. II–III with 3–4 ordinary setae additionally to sensillum ( Fig. 63 View FIGURES 62–65 ); Abd. I–III with two seta between axial group and sensillum ( Fig. 65 View FIGURES 62–65 )........................................ 6 6 3+3 uncoloured ocelli present; PAO rounded with 7–9 vesicles ( Fig. 66 View FIGURES 66–71 )............................. pallida View in CoL sp. nov.

- Ocelli absent; PAO elliptical with 12–15 vesicles ( Fig. 67 View FIGURES 66–71 )......................................... caeca View in CoL sp. nov.

7 Tibiotarsi with 18–18–17 setae, i.e. seta M absent ( Fig. 61 View FIGURES 56–61 ).................................................... 8

- Tibiotarsi with 19–19–18 setae, i.e. seta M present.......................................................... 9

8 5+5 ocelli; Abd. I–III with one setae between axial group and sensillum ( Fig. 68 View FIGURES 66–71 ); Abd. IV with 2+2 setae between sensilla ( Fig. 70 View FIGURES 66–71 )............................................................................... miracli Najt & Weiner View in CoL

- (2)3+3 ocelli; Abd. II–III with two setae (a3 and p3) between axial group and sensillum ( Fig. 69 View FIGURES 66–71 ); Abd. IV with 3+3 setae between sensilla ( Fig. 71 View FIGURES 66–71 )................................................................... amurica View in CoL sp. nov.

9 Main part of labium with 2+2 setae between sensorial elements, i.e. labium of the first type ( Fig. 72 View FIGURES 72–78 )................. 10

- Main part of labium with 1+1 setae between sensorial elements, i.e. labium of the second type ( Fig. 73 View FIGURES 72–78 )............... 11

10 3+3 ocelli present; two marginal setae of the second row on labrum clearly longer ( Fig. 74 View FIGURES 72–78 ); lateral sensilla on Th. II and sensilla of Abd. IV shorter and clearly thickened ( Fig. 76 View FIGURES 72–78 )............................................... cedrina View in CoL sp. nov.

- 5+5 ocelli present; three setae in the second labral row are longer ( Fig. 75 View FIGURES 72–78 ); all dorsal sensilla similar ( Fig. 77 View FIGURES 72–78 )...................................................................................................... pax View in CoL sp. nov.

11 Lateral sensilla on Th. II and dorsal ones on Abd. IV short and strongly thickened ( Fig. 78 View FIGURES 72–78 ); granulation moderate.................................................................................................. alba View in CoL sp. nov.

- All sensilla on terga similar in shape; tegument granulation very coarse............................ aliniensis View in CoL sp. nov.

12 Dorsolateral group on Th. II–III with sensilla p 3 in forward position ( Fig. 79 View FIGURES 79–82 )............ porcella (Fjellberg) View in CoL comb. nov.

- Dorsolateral group on Th. II–III with sensilla p 3 in backward position below ordinary setae ( Fig. 80 View FIGURES 79–82 )................. 13

13 Dark blue coloured species with 3+3 or 5+5 ocelli.......................................................... 14

- Body «bluish gray», paler ventrally; 2+2 ocelli present.............................. grana (Lee & Kim) View in CoL comb. nov.

14 Tibiotarsi with 18–18–17 setae, i.e. seta M absent ( Fig. 61 View FIGURES 56–61 ); 5+5 ocelli......................................... 15

- Tibiotarsi with 19–19–18 setae, i.e. seta M present; 3+3 ocelli.................................. oligotricha View in CoL sp. nov.

15 Labium of the first type with 2+2 setae between sensorial elements ( Fig. 72 View FIGURES 72–78 ); Abd. IV–V with only 1+1 setae between sensilla ( Fig. 81 View FIGURES 79–82 )....................................................................... deharvengi Najt & Weiner View in CoL

- Labium of the second type with 1+1 setae between sensorial elements ( Fig. 73 View FIGURES 72–78 ); Abd. IV–V with 2+2 setae between sensilla ( Fig. 82 View FIGURES 79–82 )............................................................................ tertia Najt & Weiner View in CoL

* Species of the Micranurida / Philotella complex of the region with elongated antennal sensilla not included in the key:

Two more species of this complex, which position in the existing generic classification is not clear, are known in East Asia. These are M. montana Lee & Kim, 1984 and M. tuberculata Lee & Kim, 1984 , both described from South Korea and both showing elongated antennal sensilla. Therefore, neither fits the diagnosis of the genus Micranurida sensu Deharveng (1982) . This was well known to the authors, who wrote that the situation “… prevents us from assigning the present taxon neither to Rusekella nor to Micranurida sensu Deharveng ”, but “… to leave it, for the time, with Micranurida sensu Massoud which certainly is polyphyletic ” (p. 18). Najt & Weiner (1985) also considered that these species did not fit the diagnosis of the genus Philotella , even when it was expanded to include species with reduced ocelli.

M. montana is a large species (up to 2.3 mm) with 5+5 ocelli and very peculiar chaetotaxy. For instance, it has a2 setae on Th. II–III, which is not at all characteristic of this generic complex ( Fjellberg 1985a). The dorsal chaetotaxy of M. tuberculata , which has 2+2 ocelli, is more similar to that of species of the genus Philotella , but its serrate maxilla with 8–9 minute teeth (p. 18) is not typical of the genus.

Species that do not correspond to the diagnosis of the genus Micranurida sensu Deharveng (1982) , but are listed at www.collembola.org within this genus, are also present in other areas of the Holarctic. In Europe, these are M. anophthalmica and M. forsslundi ; in North America, M. furcifera and M. valiana Fjellberg, 1985 . All of them have elongated antennal sensilla, which is more consistent with the existing diagnosis of Philotella . Obviously, while maintaining the validity of the latter genus, in the future it will be necessary to clarify the generic status of all forms listed above.