Lebertia (Pilolebertia) gibbosa Lundblad, 1926

Tyukosova, Valentina, Gerecke, Reinhard, Stur, Elisabeth & Ekrem, Torbjørn, 2022, Disentangling the identity of Lebertia porosa Thor, 1900 using integrative taxonomy (Acari: Hydrachnidia), European Journal of Taxonomy 836 (1), pp. 131-169 : 154-156

publication ID

https://doi.org/ 10.5852/ejt.2022.836.1921

publication LSID

lsid:zoobank.org:pub:A1C59540-4E3A-405B-ABB1-967D133376CC

DOI

https://doi.org/10.5281/zenodo.7086873

persistent identifier

https://treatment.plazi.org/id/03B5F931-FFB1-FFFF-FDCD-93075C63D049

treatment provided by

Felipe

scientific name

Lebertia (Pilolebertia) gibbosa Lundblad, 1926
status

 

Lebertia (Pilolebertia) gibbosa Lundblad, 1926

Fig. 9 View Fig

Lebertia gibbosa Lundblad, 1926: 206 .

Diagnosis

Small in dimensions of appendages (e.g., palp total L<420, L IV-L-4–6 <260, 290, 260); P-2 short (L 90–105), dorsal margin protruding to form a hump-like edge near insertion of dorsal setae, distoventral seta long (about 110). P-3 (L/H 2.2–2.4) and P-4 (L/H 3.0–3.7) very slender, L ratio P-2/P-3 0.9–1.0, P-3/P-4 0.8–0.9. Mediodistal seta P-3 away from dorsodistal seta (L ratio sectors A/B 1.7–1.8). Ventral seta of P- 4 in distal part, distoventral one close to distoventral segment edge (L ventral sectors 57–67, 24–34, 8–9%).

Material examined

Holotype SWEDEN • ♂, “923. Typ (360) Lebertia gibbosa Lundbl. ♂. Östergötland: Kisa rocken. Vålens tillopp. 28.06.1917, leg. O. Lundblad ”; slide mounted; NHRS.

Other material (in ethanol unless otherwise stated)

NORWAY • 1 ♂; Agder , Farsund , Vanse, stream at Vanse school; 58.10366° N, 6.69373° E; 6 m a.s.l.; 25 Jun. 2020; Torbjørn Ekrem and Thomas Stur Ekrem leg.; kick sample; BOLD specimen ID HYDCA467 ; NTNU-VM 227896 View Materials GoogleMaps 1 ♂; Agder , Farsund, Vanse, stream at playground; 58.09846° N, 6.69490° E; 6 m a.s.l.; 25 Jun. 2020; Torbjørn Ekrem and Thomas Stur Ekrem leg.; kick sample; BOLD specimen ID HYDCA569 ; NTNU-VM 227897 View Materials GoogleMaps 1 ♂, 2 ♀♀, 1 dn; Agder , Froland , Nidelva, near Blakstad, upstream bridge Frolandsveien, E riverbank; 58.51004° N, 8.64806° E; 40 m a.s.l.; 28 Aug. 2019; Gaute Kjaerstad and Reinhard Gerecke leg.; BOLD specimen ID HYDCA306 , HYDCA 429 , HYDCA454 , HYDCA455 ; NTNU-VM 227882 View Materials to 227885 View Materials GoogleMaps 2 ♂♂, 2 ♀♀; Agder , Søgne , Søgneelva, upstream bridge close to old Søgne Church; 58.08952° N, 7.83998° E; 2 m a.s.l.; 21 Jun. 2020; Gaute Kjaerstad and Reinhard Gerecke leg.; BOLD specimen ID HYDCA432 (slide mounted), HYDCA433 (slide mounted), HYDCA 462 , HYDCA463 ; NTNU-VM 227886 View Materials to 227889 View Materials GoogleMaps 1 ♂, 2 ♀♀; same collection data as for preceding; slide mounted; NTNU-VM 227891 View Materials to 227893 View Materials GoogleMaps 2 ♂♂, 2 ♀♀; same locality as for preceding; 30 Aug. 2019; NTNU-VM 227890 View Materials GoogleMaps 1 ♂; Agder , Søgne , Flomdam , Søgneelva upstream bridge near old Søgne church; 58.08962° N, 7.83937° E; 2 m a.s.l.; 30 Aug. 2019; Gaute Kjaerstad and Reinhard Gerecke leg.; BOLD specimen ID HYDCA558 ; NTNU-VM 227894 View Materials GoogleMaps 1 ♂; same collection data as for preceding; NTNU-VM 227895 View Materials GoogleMaps 1 ♀, 1 dn; Trøndelag , Orkdal , Orklavassdraget, Sagbekken, station 1; 63.24614° N, 9.67573° E; 175 m a.s.l.; 26 Jul. 2018; Gaute Kjaerstad leg.; NTNU-VM 227998 View Materials GoogleMaps .

Description

Colour in life unknown. Integument with a fine porosity. Coxal field with medial sutures Cx-I slightly longer than medial sutures Cx-II (ratio about 1.2), Cx-II posteromedially forming a narrow, acute angle. Posterior margin of Cx-IV equally rounded or forming an obtuse angle near apodeme in medial sector. Swimming setation: II-L-5 4–5; III-L-4 4–5; III-L-5 7–9; IV-L-4 4–5; IV-L-5 7–9. Chelicera L/H ratio 8.0, basal segment/claw ratio 7.0.

Males

Idiosoma L 1060, coxal shield 740, Cx-I/II mL 190/165. Genital field L/W 190/130, with 34–44 medial setae; Ac-1–3 L 65, 50, 35. Gnathosoma L 200; chelicera basal segment L 270, H 55; claw 60.

Leg measurements (L/H, ratio): I-L-4 121–132/46–48, 2.62–2.86; I-L-5 125–138/37–40, 3.35–3.65; I-L-6 99–125/35–38, 2.81–3.35; IV-L-4 227–240/48–55, 4.36–4.86; IV-L-5 242–260/37–43, 6.12–6.47;

IV-L-6 207–225/40, 5.22–5.63; proportions of segments (L ratio): IV-L-4/5 0.92–0.94, IV-L-4/6 1.07– 1.10, IV-L-5/6 1.15–1.17; IV-L claw L 50.

Palp measurements (L/H, ratio, % total L): P-1 30/43, 0.7, 8; P-2 92–96/60–62, 1.5–1.6, 25; P-3 97– 103/44–45, 2.2–2.3, 27; P-4 112–123/36–38, 3.1–3.3, 32; P-5 33/5, 7,2, 8; proportions of segments (L ratio): P-2/P-3 0.94–0.96, P-2/P-4 0.79–0.82, P-3/P-4 0.83–0.86; distance ratio distal setae P-3 (A/B) 1.67; P-4 ventral sectors 63%, 28%, 9%; palp total L 384.

Females

Idiosoma L 900–1200; coxal shield 720–750; Cx-I/II mL 210–225/170. Genital field L/W 180–190/150, with 18–24 medial setae; Ac-1–3 L 55–60, 55–60, 38–40. Gnathosoma L 210; chelicera basal segment L 210, H 30; claw 30.

Leg measurements (L/H, ratio): I-L-4 145/50, 2.90; I-L-5 150/40, 3.75; I-L-6 130/38, 3.47; IV-L- 4 255/60–65, 3.92–4.25; IV-L-5 273–280/48–55, 4.95–5.89; IV-L-6 240–250/43–45, 5.33–5.88; proportions of segments (L ratio): IV-L-4/5 0.91–0.94, IV-L-4/6 1.02–1.06, IV-L-5/6 1.12–1.14; IV-L claw L 50–55.

Palp measurements (L/H, ratio, % total L): P-1 31–33/43–45, 0.7, 8; P-2 100–103/63–65, 1.6, 24–25; P-3 110–113/48, 2.3–2.4, 27; P-4 130–138/38–39, 3.4–3.7, 32–33; P-5 33/5, 7.2, 8; proportions of segments (L ratio): P-2/P-3 0.91, P-2/P-4 0.73–0.79, P-3/P-4 0.80–0.87; distance ratio distal setae P-3 (A/B) 1.80; P-4 ventral sectors 57–67 %, 24–34 %, 8–9 %; palp total L 410–411.

Remarks

The meagre original description is without measurement data and refers in most details to character states typical for all species of the subgenus Pilolebertia ( Lundblad 1926) . The only diagnostic feature mentioned is the name-giving shape of P-2, elevated to form an obtuse-angled hump. Lundblad’s fig. 5 shows a palp with P-3 having the mediodistal seta approaching the dorsodistal seta (calculated ratio A/B ca 2.0). P-3/-4 slender (L/H ratio 2.1, 2.9), P-3 proportionally long (L ratio P-3/4 0.85).

Lebertia gibbosa fits the characteristics of the porosa -like Lebertia species in the absence of a kink in the distoventral gnathosomal margin, but distinct differences are found in the characteristic, namegiving hump of P-2, the slender palp segments P-3 and P-4, the position of the ventral setae (both in distal half, proximal sector>50%), and the small size of the distal peg seta on P-4. The P-4 size is similar to that in L. inaequalis (Koch, 1837) , and application of the key in Gerecke (2009) is misleading, keying L. gibbosa to L. inaequalis . Lebertia inaequalis agrees with L. gibbosa also in the swimming setation, but differs, in addition to the ventral kink of the gnathosoma, in having a P-2 with its dorsal margin equally curved, not protruding to form a hump, and P-3 with mediodistal seta not, or only slightly, approaching the dorsodistal seta. A comparison with measurements of Norwegian specimens morphologically attributed to L. inaequalis reveals a wide overlap in many dimensions and proportions. The latter differ from L. gibbosa in having a more slender I-L-6 (L/H>3.7), longer IV-L claws (> 55) and a higher P-2/P-3 ratio (> 1.0). DNA barcode data in BOLD indicate that L. inaequalis , similar to what is shown here for L. porosa aggr., represents a species complex with several BINs under this name. Upon taxonomic revisions, we expect that the wide variability for leg proportions of L. inaequalis described by Gerecke (2009) will cover a range of several distinct species.

Before our study, this species was only known from its type locality on the island of Gotland ( Sweden). Our data show a wide distribution in southern Norway, in the north reaching up to southern Trøndelag County (63° N). As this species has been widely overlooked, the full geographical distribution of L. gibbosa cannot be defined without additional research.

NHRS

Swedish Museum of Natural History, Entomology Collections

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Trombidiformes

SubOrder

Prostigmata

SuperFamily

Lebertioidea

Family

Lebertiidae

Genus

Lebertia

SubGenus

Pilolebertia

Loc

Lebertia (Pilolebertia) gibbosa Lundblad, 1926

Tyukosova, Valentina, Gerecke, Reinhard, Stur, Elisabeth & Ekrem, Torbjørn 2022
2022
Loc

Lebertia gibbosa

Lundblad O. 1926: 206
1926
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