Endonura reticulata ( Axelson, 1905 )

Smolis, Adrian, Deharveng, Louis & Kaprus’, Ighor J., 2011, Studies on the non-European Endonura Cassagnau, 1979 (Collembola, Neanuridae, Neanurinae), Zootaxa 3004, pp. 45-56: 52-55

publication ID

10.5281/zenodo.278475

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http://treatment.plazi.org/id/03C9E776-FFDB-FFB4-BCAB-FD6BA4FDF853

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scientific name

Endonura reticulata ( Axelson, 1905 )
status

 

Endonura reticulata ( Axelson, 1905) 

Figs 22–34 View Figure , Tab. 3

Neanura reticulata Axelson, 1905: 790 

Neanura (Endonura) tundricola Fjellberg, 1985: 120 

Material examined. 2 males and 3 juveniles on slides: Russia: North Karelia, Sedlovataya Island, tundra vegetation, mosses and flood debris, 25.ix. 1992, leg. R. J. Pomorski. 1 male, 1 female and juvenile on slides: Russia: North Karelia, Lebyazh’ya Inlet, sea shore, under rooting logs, 25.ix. 1992, leg. R. J. Pomorski, D. Skarżyński. 1 female on slide: Russia: North Karelia, Bolshoye Cherlivoye Lake, sea shore, mosses on rocks, 25.ix. 1992, leg. R. J. Pomorski. 1 juvenile (I instar) on slide: Russia: North Karelia, Sredniy Island, sea shore, lichens on rocks, 26.ix. 1992, leg. M. Wożny. 1 juvenile on slide: Russia: South of Taimyr Peninsula, upper current of Nizhnaya Agapa river, Ladannakh lake, R 139 / 99, under bark of deciduous tree, 11.viii. 1999, leg. A. Babenko. 1 female and male on slide: Russia: Putorana plateau, Dynkenda Mts., Yt-kyuel (Sobach’e) lake, R 53 / 97, forest belt 80 m a.s.l., cover of lichens and mosses on stones, 22.vii. 1997, leg. A. Babenko. 1 male on slide: Russia: Northwestern part of Yamal Peninsula, Martyusha river, peat hillock of dead Sphagnum, 22–23.viii. 1994, leg. A. Babenko. 1 female on slide: Russia: delta of Indigirka river, peat hillock in sedge/moss bog, 14–15.vii. 1994, leg. A. Babenko. 10 females on slides: Russia: Arkhangelsk province, Pechora bay, Kuznetskoe Lake, Tussock tundra, under logs, 25–26. viii. 1994, leg. A. Babenko. 1 juvenile on slide: Russia: Krasnoyarskii Kray, mouth of Nizhnaya Tunguska River, vicinity of Turukhansk, birch forest, 8.viii. 2003, leg. A. Babenko. 4 females and 3 juvenile on slides: Russia: Primorskyi Kray, Shkotovsky area, Livadiysky Range, Anisimovka, mixed forest and dry river’s bed, under bark of trees and stones, ix. 2004. leg. R. J. Pomorski. 21 specimens juveniles to subadult (2 on slide): Russia: Primorskyi Kray, Kraskino, Devil’s Hill, Quercus  forest, litter, 28.ix. 2004, leg. L. Deharveng & A. Bedos (sample RU- 115).

Diagnosis. Habitus typical of the genus Endonura  . Dorsal tubercles present and well developed, sometimes tubercles Di on th. I absent. 2 + 2 eyes dark-pigmented. Buccal cone rather short. Head with chaetae A, B, C, D and E. Chaeta O present. Tubercles Dl and (L+So) on head with 6 and 10 chaetae respectively. Tubercles De on th. II and III with 3 and 4 chaetae respectively. Tubercles L on abd. III and IV with 4 and 6–9 chaetae respectively. Abd. IV and V with 8 and 3 tubercles respectively. Claw without inner tooth. Tibiotarsi with chaetae B 4 and B 5 short.

Redescription. Habitus typical of the genus. Body length (without antennae): 0.6–2.30 mm. Colour of the body spotted bluish grey, sometimes very pale. 2 + 2 medium dark pigmented eyes ( Fig. 22 View Figure ).

Types of dorsal ordinary chaetae. Macrochaetae Ml thickened, relatively long, arc-like or straight, narrowly sheathed, feebly serrated, apically rounded or rarely pointed ( Figs 22, 24, 32–34 View Figure ); macrochaetae Mc and Mcc thickened, straight and not pointed; mesochaetae and microchaetae short, thin and pointed.

Head. Buccal cone short. Labrum rounded, with ventral sclerifications as in Fig. 25 View Figure . Labrum chaetotaxy 4 / 2, 4. Labium with four basal, three distal and four lateral chaetae, papillae x absent. Maxilla styliform ( Fig. 28 View Figure ), mandible thin with two basal and two apical teeth ( Fig. 29 View Figure ). Chaetotaxy of antennae as in Tab. 3 c and in Figs 26–27 View Figure .

Apical vesicle distinct and variable, from unilobed to trilobed ( Fig. 26 View Figure ). S–chaetae of ant.IV of medium length and moderately thickened ( Fig. 27 View Figure ). Chaetotaxy of head as in Tab. 3 a, b, and Fig. 22 View Figure . Tubercles Cl and Af separate ( Fig. 22 View Figure ). Chaeta O present. Chaetae D and E free. Tubercle Dl with 6 chaetae, chaeta Dl 3 present ( Fig. 22 View Figure ). Tubercle (L+So) with 10 chaetae, chaetae So 3 and L 3 present ( Fig. 22 View Figure ). Elementary tubercle BE absent. Chaeta A shorter than B.

Thorax, abdomen, legs. Body s-chaetae fine and smooth, shorter than nearby macrochaetae ( Fig. 24 View Figure ). Chaetotaxy of th. and abd. as in Tab. 3 d and in Figs 24, 30–34 View Figure . Tubercles Di on th.I differentiated or not. Chaetae De 3 on th. III and abd. I–III as Mc, Mcc or mi. Chaetae De 2 on th. II–III and De 3 on th. III free. Chaetae De 3 on abd. I–III free ( Fig. 24 View Figure ). The line of chaetae De 1 –chaeta s not perpendicular to the dorsomedian line on abd. I–IV. Tubercle L on abd. III with 4 chaetae. Tubercle L on abd. IV sometimes divided ( Fig. 30 View Figure ), with 6–9 chaetae and without free chaetae ( Figs 30–31 View Figure ). Furca rudimentary without microchaetae ( Fig. 30 View Figure ).Tubercles Di on abd. V fused, with chaetae Di 2 as Mc and Di 3 as Mcc or mi ( Figs 32–34 View Figure ). Chaetae L' and Vl on abd. V present ( Fig. 30 View Figure ). No cryptopygy. Chaetotaxy of legs as in Tab. 3 d. Tibiotarsi with rather long chaetae B 4 and B 5. Claw without inner tooth ( Fig. 23 View Figure ).

Discussion. See: Discussion of E. asiatica  .

a) Cephalic chaetotaxy –– dorsal side b) Cephalic chaetotaxy –– ventral side

Group Number of chaetae Vi 6 Vea 4 Vem 3 Vep 4 labium 11, 0x

c) Chaetotaxy of antennae

Segment, Group Number of chaetae Segment, Group Number of chaetae I 7 IV Adult First instar II 12 or, 8 S, i, 12 mou, 6 brs, 2 iv or, 2 S, i, 6 mou, 1 brs, 2

iv III 5 sensilla AO III

5 ap 8 bs, 5 miA 8 bs, 5 miA ve

vc 4 ca 2 bs, 3 miA 2 bs, 3 miA vi 4 cm 3 bs, 1 miA 3 bs, 1 miA d 5 cp 8 miA, 1 brs 8 miA

d) Postcephalic chaetotaxy

Terga Legs

Di De Dl L Scx 2 Cx Tr Fe T th. I 1 2 1 - 0 3 6 13 19 th. II 3 2 +s 3 +s+ms 3 2 7 6 12 19 th. III 3 3 +s 3 + s 3 2 8 6 11 18

Sterna

abd. I 2 3 + s 2 3 VT: 4

abd. II 2 3 + s 2 3 Ve: 5–6 Ve 1 - present

abd. III 2 3 + s 2 4 Vel: 5 Fu: 4–6 me 0 mi abd. IV 2 2 + s 3 6 –9 Vel: 4 Vec: 2 Vei: 2 Vl: 4 abd. V (3 + 3) 7–8 +s Ag: 3 Vl: 1 L': 1 abd. VI 7 Ve: 13–14 An: 2mi Remarks. The species was described by Axelson (1905) from Russian Karelia. However, since the original description was very insufficient, Gisin (1960) in his “Collembolenfauna Europas” considered “ Neanura reticulata  ” as species dubiae. Lately Fjellberg (1998) in his “ Collembola  of Fennoscandia and Denmark “ studied syntypes from Russian Karelia and described the species more precisely; nevertheless, the author did not fully resolve its taxonomical position. Analysis of new reach materials, including specimens from North Karelia (see: Material examined), and taxonomical uncertainties mentioned by Fjellberg (1998) led us to propose a thorough redescription to establish and clarify its identity. Unfortunately, Axelson’s syntypes has been lost during the removal of the museum collections a few years ago (dr. Pekka Vilkamaa, Curator of Zoological Museum, University of Helsinki, pers. comm.).

The species is actually Holarctic and circumboreal, occurring in North Europe, northern Asia and North America. Western Palearctic records reach 56 o N (Öland, Sweden, Fjellberg 1998), but further east E. reticulata  reaches more southerly latitudes (43 o N, Russian Far East, Nachodka). At first, the North American population was thought to represent an undescribed species that Fjellberg (1985) described as E. tundricola  , but later this species was considered as a possible synonym of E. reticulata  by Fjellberg (1998), a suggestion that was finally accepted by Babenko and Fjellberg (2006). A juvenile specimen of Endonura  cf. tetrophtalma from Polish Carpathians led Fjellberg (1998) to suggest a possible synonymy with E. reticulata  . More recent work ( Smolis 2008) have shown that the mentioned specimen represents E. tatricola ( Stach, 1951)  , distinct and well defined taxon from the Carpathians.

E. reticulata  is an eurytopic species with preferences to wet sites, found both in vegetation of sea and lakes shores, tundra, arctic meadows, willow/birch/alder thickets, boreal and temperate forests (Fjellberg 1989, 1998; Pomorski & Skarżyński 1995).

TABLE 3. Chaetotaxy of Endonura reticulata:

Tubercle Number of chaetae Types of chaetae Names of chaetae
Cl 4 Ml Mc F G
Af 11 Ml Mc Mcc or mi mi B A C, E, O D
Oc 3 Ml Mc mi Ocm Ocp Oca
Di 2 Ml Mcc or mi Di1 Di2
De 2 Ml Mcc or mi De1 De2
Dl 6 Ml Mc Mcc or mi mi Dl1, Dl5 Dl4 Dl6 Dl2
(L+So) 10 Ml Mc me L1, L4, So1 L2 L3, So2–6

TABLE 3. Chaetotaxy of Endonura reticulata:

Tubercle Number of chaetae Types of chaetae Names of chaetae
Cl 4 Ml Mc F G
Af 11 Ml Mc Mcc or mi mi B A C, E, O D
Oc 3 Ml Mc mi Ocm Ocp Oca
Di 2 Ml Mcc or mi Di1 Di2
De 2 Ml Mcc or mi De1 De2
Dl 6 Ml Mc Mcc or mi mi Dl1, Dl5 Dl4 Dl6 Dl2
(L+So) 10 Ml Mc me L1, L4, So1 L2 L3, So2–6

Kingdom

Animalia

Phylum

Arthropoda

Class

Entognatha

Order

Collembola

Family

Neanuridae

Genus

Endonura

Loc

Endonura reticulata ( Axelson, 1905 )

Smolis, Adrian, Deharveng, Louis & Kaprus’, Ighor J. 2011

2011
Loc

Neanura (Endonura) tundricola

Fjellberg 1985: 120

1985
Loc

Neanura reticulata

Axelson 1905: 790

1905