Entomobrya guadarramensis Jordana & Baquero, 2021

Baquero, Enrique, Jordana, Rafael & Ortuño, Vicente M., 2021, Distinctive Collembola Communities in the Mesovoid Shallow Substratum: Entomobryomorpha of the Sierra de Guadarrama National Park (Central Spain), Zoosystema 43 (3), pp. 37-78 : 50-53

Entomobrya guadarramensis Jordana & Baquero n. sp.

( Figs 8A ; 9 ; Table 3 )

urn:lsid:zoobank.org:act:35F1F485-6D6D-4333-8AB3-F52D73AE0D1F

TYPE MATERIAL. — Holotype. Spain • ♀; Segovia , Sierra de Guadarrama, Majada Hambrienta (Northeast); 30 T 4185 45229; 1994 m a.s.l.; 17.XI.2015; Ortuño et al. leg.; pitfall SSD (since 2.VI.2015); MZNA SSD-7 (slide 06).

Paratypes. Spain • 19 specimens in ethyl alcohol; same data; MZNA as for holotype; Ortuño et al. leg.; MZNA • 4 specimens on slide and 78 in ethyl alcohol; SSD-6 , slides 10 and 11; same data; MZNA • 5 specimens on slide and 24 in ethyl alcohol; SSD-8 , slides 01 and 05; same data; MZNA • 4 specimens; SSD- 10 , slide 02; same data; MZNA • 2 specimens on slide and 10 in ethyl alcohol; SSD-8 , slides 14 and 15; same data as for holotype; Ortuño et al. leg.; MNHN .

TYPE LOCALITY. — Spain, Segovia, Sierra de Guadarrama, Majada Hambrienta (Northeast); 30 T4185 45229; 1994 m a.s.l.

ETYMOLOGY. — The specific epithet refers to the presence of this species in the Sierra de Guadarrama.

ADDITIONAL MATERIAL. — Spain • 24 specimens on slide and 212 in ethyl alcohol; SSD-1 (0.5 m depth), slides 03-07; Sierra de Guadarrama, Segovia; Ortuño et al. leg.; MZNA • 27 specimens; SSD-1 (1 m depth), slides 05, 06 and 08-09; same data; MZNA • 5 specimens; SSD-2 (0.5 m depth), slides 03, 05 and 09; same data; MZNA • 3 specimens on slide and 210 in ethyl alcohol; SSD-3 (0.5 m depth), slides 02, 03; same data; MZNA • 4 specimens; SSD-3 (1 m depth), slides 10, 11; same data; MZNA • 2 specimens on slide and 60 in ethyl alcohol; SSD-4 (0.5 m depth), slides 03, 04; same data; MZNA • 1 specimen on slide and approximately 1000 in ethyl alcohol; SSD-4 (1 m depth), slide 05; same data; MZNA • 5 specimens; SSD-5 , slide 04; same data; MZNA • 1 specimen on slide and 30 in ethyl alcohol; SSD- 16 , slide 03; same data; MZNA • 12 specimens on slide and 562 in ethyl alcohol; SSD-17 , slides 05 and 07; same data; MZNA • 2 specimens on slide and 158 in ethyl alcohol; SSD-18 , slides 04 and 06; same data; MZNA • 3 specimens on slide and 124 in ethyl alcohol; SSD-20 , slide 04; Madrid; same data; MZNA • 2 specimens on slide and 19 in ethyl alcohol; SSD-22 , slide 05; same data; MZNA • 1 specimen on slide and 371 in ethyl alcohol; SSD-25 , slide 04. Madrid; same data; MZNA • 136 specimens in ethyl alcohol; SSD-11 ; same data; MZNA • 12 specimens in ethyl alcohol; SSD-12 ; same data; MZNA • 13 specimens; SSD- 13 , slides 03 and 05; same data; MZNA • 180 specimens in ethyl alcohol; SSD-14 ; same data; MZNA • 106 specimens in ethyl alcohol; SSD-15 ; same data; MZNA • 4 specimens on slide and 152 in ethyl alcohol; SSD-19 , slides 05 and 06; same data; MZNA • 194 specimens in ethyl alcohol; SSD-21 ; same data; MZNA • 7 specimens; SSD-23 , slide 03; same data; MZNA • 2 specimens on slide and 81 in ethyl alcohol; SSD-26 , slide 02; same data; MZNA • 7 specimens on slide and 1027 in ethyl alcohol; SSD- 27 , slide 05; same data; MZNA • 1 specimen; SSD-29 , slide 11; same data; MZNA • 4 specimens on slide and 180 in ethyl alcohol; SSD-31 , slides 09 and 12; same data; MZNA • 5 specimens; SSD-32 , slide 03; same data; MZNA • 3 specimens on slide and 64 in ethyl alcohol; SSD-33 , slide 08; same data; MZNA .

DIAGNOSIS. — White species, with lateral pigmentation, 2-4 Mc on areas T1-T2 on Th II, 2-5/1-2-1(2) Mc on areas A1-A5 on AbdII- III, and abundant Mc on AbdIV. The unequivocal identification of the species can only be done using the abbreviated formula that, for this species, is: 3-1-0-3-2/2-4/2-5/1-2-1(2)/7-4- 204 - 102 -2 (following Jordana & Baquero 2005).

DESCRIPTION

Size and color

Body length (excluding antennae): 2.60 mm (n =10), up to 2.84 mm (holotype 2.66 mm). Ground color white or very pale yellow, with pigment on lateral body, dorsolateral head and vertex, transversal stripes on some posterior tergites, and two patches with more or less development and intensity on Abd II-IV ( Fig. 8A ).

Head

Eight eyes, GH smaller than EF. Antennae length 1.36 mm, 2.08-2.92 times the length of the head (n =4; the antennae have suffered the sampling method by the time the specimens have been in the polyethylene glycol); Ant IV with simple apical vesicle and pin chaeta present; sensory organ of Ant III with the special rod-like sensilla, and three additional guard sensilla ( Fig. 9C ); relative length of Ant I/II/III/IV=1/2.08/1.95/1.89 (n =3). Prelabral chaetae ciliated. Labral papillae multispinose. Lateral process of labial papilla E 1/3 shorter than the papilla, not reaching their apex. Maxillary palp bifurcated, with three sublobal chaetae ( Fig. 9B ).

Body and legs

Length ratio of Abd IV/III = 5.30 (between 3.85-6.43; n=10). Trochanteral organ with approximately 35 chaetae ( Fig. 9H ). Tibiotarsus not sub-segmented, without smooth chaetae, except for smooth terminal chaeta on legs III. Claw with four teeth: paired at 50% and first unpaired at 75% from base; dorsal teeth not basal ( Fig. 9I ). Empodium lanceolate, with smooth external lamella (pe) in leg III. Tenent hair clavate. Length of manubrium and dens 0.53 and 0.66 mm, respectively (average for n =9). Manubrial plate with four or five chaetae and two pseudopores. Mucro with teeth similar in size, mucronal spine reaching the tip of the subapical tooth ( Fig. 9J ); non-crenulated area of dens two times the length of mucro. Body chaetae as in Figure 9G .

Macrochaetotaxy ( Fig. 9A , D-F)

Simplified Mc formula: 3-1-0-3-2/2-4/2-5/1-2-1(2)/7-4-2 04 - 102 -2. Head: H1 area with Mc An 2, An 3a1 and An 3; H2 area with one Mc (A 5), and A6-A7 more or less developed to Mc in some specimens; H4 area with three Mc (S 1, S 3 and S 4i; S 4p always present); H4’ area with three Mc (S 5, S 5i and S 4); H5 area with Ps 2 and Ps 5 Mc. Mesothorax: area T1 habitually with two Mc (m 1 and m 2i), sometimes m 2 or m 2i2 instead m 2i; T2 with four Mc (m 4, m 4i, a 5 and a5’). Abdomen: Abd II area A1 with two Mc (a 2 and a 3; sometimes and additional mes or Mc above them), area A2 with five Mc, between three and seven (m 3, m 3ep, m 3e, m 3ea m 3eai2; sometimes m 3ei present; Abd III with one Mc on area A3 (a 1) and two Mc on A4 (a 2 and a 2a) and A5 (m 3 always present, m 3a sometimes present as Mc, and m 3e –if present– as mes); Abd IV with up to seven Mc on A6 area (A 1, Ae2, B 1, Be1, Be2, Be3 and D 1), four Mc on A7 area (A 2, B 2, B 3 and E 1), four Mc on A8 (A 4, Ae4, B 4 and C 2a) in addition of two unpaired mes (A 03 and A 04), two Mc on A9 (A 5 and B 5) in addition to one unpaired mes (A 05) and two on A10 (A 6 and B 6).

ECOLOGY

Species widely distributed in the three mountain ranges ( Fig. 1B, C ). It is present in the MSS of the three bioclimatic zones and its overwhelming implantation in the subsoil, and the fact that it has never been registered as epigeous, suggests that it is a regular inhabitant of this habitat. It was extraordinarily abundant in SSD-27 of the Canchal de Bailanderos ( Figs 1B, C ; 3C, D ), located in the cryo-Mediterranean zone. At this site 1034 specimens of E. guadarramensis Jordana & Baquero n. sp. were collected; thus, almost all of the Entomobryomorpha (1039 not including Orchesella ) found from SSD-27 ( Fig. 1E ) evidence the dominance of this species over the other three species of syntopic Entomobryomorpha ( Figs 1F ; 3D ).

REMARKS

If we consider the dorsal macrochaetotaxy of the abdominal tergites Abd II-III using the simplified formula, 2-5/1-2-1(2), it differs from all the Entomobrya species described except for E.airamii Baquero & Jordana, 2018 , E.dorsalis Uzel, 1891 , E.dorsolineata Jordana, Schulz & Baquero, 2009 , E.icoae Baquero & Jordana, 2018 and E.longisticta Baijal, 1958 (sensu Baquero et al. 2013). The differences among these species and the new species can be seen in Table 3 , showing 6, 15, 15, 7 and 9 different chaetotactic characters.

Highly abundant species in the MSS of the Sierra de Guadarrama, accounting for 24% of the total Entomobryomorpha studied in this work ( Fig. 1D ), and 25% of the Entomobryidae (not including Orchesella ) ( Fig. 2A, B ).

Figures

FIG. 8. — Habitus and color patterns of some species: A, Entomobrya guadarramensis Jordana & Baquero n. sp.; B, Entomobrya ledesmai Jordana & Baquero n. sp.; C, D, Lepidocyrtus labyrinthi Baquero & Jordana n. sp.; E, Lepidocyrtus purgatori Baquero & Jordana n. sp.; F, Lepidocyrtus paralignorum Baquero & Jordana n. sp.; G, Pseudosinella valverdei Baquero & Jordana n. sp.; H, Pseudosinella gonzaloi Baquero & Jordana n. sp. Scale bar: 0.25 mm.

FIG. 9. — Entomobrya guadarramensis Jordana & Baquero n. sp.: A, head chaetotaxy; B, maxillary palp and outer maxillary lobe; C, sensory organ of antennal segment III; D, ThII dorsal macrochaetotaxy; E, Abd I-III dorsal macrochaetotaxy; F, AbdIV-V dorsal macrochaetotaxy; G, chaetae from central area of AbdII; H, trochanteral organ; I, claw and empodium; J, tip of furcula showing the nonringed area of dens, mucro and mucronal spine. Abbreviations: see Material and methods. Symbols: ●: Mc; ○, mes; ▲, sensilla. Scale bars: A, D-F, 0.05 mm; B, H-I, 0.02 mm; C, G, J, 0.01 mm.

FIG. 1. — A, basic orography of the Sierra de Guadarrama National Park; B, location of the subterranean sampling devices (SSD) in the Sierra de Guadarrama National Park; C, collection sites of the species collected with the SSDs; D, relative abundance of Entomobryomorpha Börner, 1913 species (excluding Orchesella Templeton, 1835); E, relative abundance by SSDs; F, species richness by SSD. Abbreviations: exx, specimens; spp, species.Species authorships:see Index of species.

FIG. 3. — Places where new species have been collected more abundantly: A, C, E, G, photos of the sampled biotopes; B, D, F, H, exact installation point and brief card of the SSDs (location and collecting species of Entomobryomorpha Börner, 1913, excluding Orchesella Templeton, 1835). Species authorships: see Index of species.

FIG. 2. — Diversity, abundance and percentage of Collembola (42 745 specimens) collected in the MSS of the Sierra de Guadarrama National Park: A, values by orders and families; B, Entomobryidae Schäffer, 1896 species values (excluding Orchesella Templeton, 1835); C, Isotomidae Schäffer, 1896 species values. Species authorships: see Index of species.