Oribatid Mites (Acari: Oribatida) From Venezuela, Ii. New Or Rare Species From Montane Forests
Author
Mahunka, S.
text
Acta Zoologica Academiae Scientiarum Hungaricae
2006
52
3
271
286
journal article
10.5281/zenodo.12585851
2064-2474
12585851
Beckiella costulata
sp. n.
(
Figs 1–5
)
Diagnosis: Lamellae conspicuous, strongly developed. Prodorsal surface – except the interlamellar part – smooth. Sensillus long, directed laterally, its head lanceolate. Dorsosejugal suture absent, nine pairs of short notogastral setae present. Epimeral setae – except
1c, 3c
and
4c
– very short. Tarsus of leg IV with large, triangular elevation.
Material examined:
Holotype
: Estado
Mérida
, Parc Nacional Sierra
Nevada
. Andean montane rainforest dominated by
Decussocarpus
(
Podocarpaceae
) near the cable car station La
Montaña
. At
2460 m
. alt. Litter and mosses. 15. Febr. 1997. Coll. S. & T.
PÓCS
(No.
97121
).
5 paratypes
from the same locality.
Holotype
(1701-HO-05) and
4 paratypes
(1701-PO-05): HNHM
2
,
1 Paratypes
: MHNG
3
.
Description: Measurements: Length of body: 612–737 µm, width of body: 225–300 µm.
Prodorsum: Rostral apex slightly elongated. Prodorsum with well-developed, slightly curved costulae, nearly parallel, not far from each other (
Fig. 5
), they reach beyond the insertion of lamellar setae (
Fig. 4
) with distal end directed outwards. Interlamellar region and the surface of costulae foveolate. Rostral and lamellar setae setiform, distinctly barbed, interlamellar and exobothridial setae simple, thin and smooth. Sensillus long, directed slightly backwards and outwards; head simply lanceolate, smooth.
Notogaster: Dorsosejugal suture reduced, in its place only very thin lines visible (
Fig. 1
). Nine pairs of short notogastral setae present, setae
c
2
absent. Setae
la
and
lm
setiform, smooth,
lp, h
1
and
h
2
spiniform, pilose, the remaining setae bacilliform, smooth. No essential difference in their length, only setae
h
3
shorter than setae
p
1
–
p
3
.
Lateral part of podosoma: Tutorium short, pedotectum 1 small.
Ventral parts (
Fig. 3
): Infracapitulum with a small hollow anteromedially. Epimeral setal formula: 1–0–2–3. Setae
1c
much longer than the remaining ones, curving backwards. Some apodemes and borders well, others weakly developed. Longitudinal one well visible. Epimeral borders framing the epimeal region posteriorly conspicuously wide. All setae in the anogenital region short, setae
ad1
and
ad2
bacilliform, all others setiform.
Legs: Tarsus IV with a pair of large, sharply pointed elevation (
Fig. 2
).
Remarks: The new species is well characterised by the form of the wide and well-sclerotised lamellae. On this basis the new species belongs to species group of
Beckiella reticulofemorata
BALOGH
et
MAHUNKA
, 1982
, along with
B. opposita
MAHUNKA
, 1982
,
B. fratercula
BALOGH
et
MAHUNKA
, 1978
, etc. The new species is distinguished from all congeners by the conspicuous length of lamellae.
Etymology: Named after the well-developed prodorsal costulae.
1 Serial number of the collectors.
2 HNHM: deposited in the Hungarian Natural History Museum,
Budapest
, with identification number of the specimens in the Collection of
Arachnida
.
3 MHNG: deposited in the Muséum d’Histoire Naturelle, Geneva.