Four new epigean spiders of the genus Cybaeus (Araneae: Cybaeidae) from South Korea
Author
Lee, Sue Yeon
0000-0002-2066-3747
College of Agricultural Life Science, Jeonbuk National University, Jeonju-si 54896, Republic of Korea & hongdan 200 @ naver. com; https: // orcid. org / 0000 - 0002 - 2066 - 3747
hongdan200@naver.com
Author
Yoo, Jung Sun
0000-0002-3243-2006
Biological and Genetic Resources Utilization Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea Life and Environment Research Institute, Konkuk University, Seoul 05029, Republic of Korea & lycosidae @ korea. kr; https: // orcid. org / 0000 - 0002 - 3243 - 2006
lycosidae@korea.kr
Author
Kim, Seung Tae
text
Zootaxa
2021
2021-05-05
4966
4
458
468
journal article
6500
10.11646/zootaxa.4966.4.4
27992481-4564-418c-851f-64ba0c63abfc
1175-5326
4738778
62FE9E52-E3F2-4484-800D-61D916872A5A
Cybaeus pseudoauriculatus
sp. nov.
Figs 4
,
5
Type material.
Holotype
:
male,
27 June 2019
,
Mt. Naejangsan
,
Naejang-dong
,
Jeongeup-si
,
Jeollabuk-do
,
Korea
(
35°29'19" N
,
126°54'08" E
, alt.
235 m
), leg. S.
T
. Kim (
NIBR-KDELIV0000003119
)
,
Paratypes
:
4 males
, same data as holotype, leg. S.
T
.
Kim
(
NIBR-KDELIV0000006782–85
)
;
2 males
,
17 October 2019
,
Mt. Deogyusan
,
Samgong-ri
,
Seolcheon-myeon
,
Muju-gun
,
Jeollabuk-do
,
Korea
(
35°53'19.4" N
,
127°46'62.3" E
, alt.
261 m
), leg. S.
T
.
Kim
(KKU-LEI-Ara20190627-
CY001–2
)
.
Etymology.
The specific name is a compound word from the Greek prefix ‘
pseudo
’ meaning similar and the specific name of
Cybaeus auriculatus
Seo, 2017
. It refers to the similarity in the male palpal organ morphology between both species.
Diagnosis.
The new species is most similar to
Cybaeus auriculatus
Seo,
2017
in the shape of the palpal organ, body appearance, and the number of peg setae on the PA, but can be distinguished by the shape of cymbium, embolus and conductor, the number of retromarginal teeth and the presence or absence of the cuticular spine on the retrolateral surface of tibia: males of
Cybaeus pseudoauriculatus
have a long cymbium (
Figs. 4D–G
), 9 retromarginal teeth (
Fig. 4B
), a windingly curved embolus not wrapped by the conductor (
Fig. 4E–F
), a narrow conductor base and lacks a cuticular spine on the retrolateral surface of the palpal tibia,
versus
a short cymbium, 10 retromarginal teeth, smoothly curved embolus wrapped by the conductor, a broad conductor base, and a long cuticular spine on the retrolateral surface of the palpal tibia in
C. auriculatus
(
Seo, 2017
: p. 114, fig. 1). In addition, leg spination on the femur, tibia and metatarsus differs between the two species (
Table 1
).
FIGURE 4.
Cybaeus pseudoauriculatus
sp. nov.
, male holotype. A. Body, habitus (specimen); B. Chelicera; C. Sternum; D. Palp, prolateral view; E. Ditto, ventral view; F. Ditto, retrolateral view; G. Ditto, dorsal view; H. Patella, dorsal view (Scale bars in mm).
Description. Male
holotype
.
Total length 3.32. Carapace: 2.05 long / 1.90 wide, thin brown, head region slightly darker than thoracic region, suboval, cervical and radial furrows distinct, longitudinal fovea needle-shaped, head region slightly elevated, margin of thoracic region with faint blackish brown stripe (
Fig. 4A
). Eyes: AER 0.31, PER 0.49, AME 0.04, ALE 0.09, PME 0.06, PLE 0.08, AME-AME 0.02, AME-ALE 0.01, PME-PME 0.08, PME-PLE 0.07, AME-PME 0.09, ALE-PLE 0.04, all eyes on slightly raised eye tubercles, AER slightly recurved and PER straight from above. Chelicera: 1.06 long / 0.40 wide, thin brown with 3 promarginal teeth and 9 retromarginal teeth (5 small and 4 large) (
Fig. 4B
), lateral condyle present. Endite: 0.56 long / 0.30 wide, thin brown. Labium: 0.40 long / 0.26 wide, pale brown. Sternum: 1.02 long / 1.00 wide, pale brown, subcordate, convex, posterior end pointed protruding deeply between the coxae of leg IV (
Fig. 4C
). Legs: I 7.27 (2.05, 0.65, 1.95, 1.64, 0.98) / II 6.69 (1.87, 0.64, 1.67, 1.58, 0.93) / III 5.13 (1.60, 0.50, 1.10, 1.25, 0.68) / IV 6.95 (1.95, 0.73, 1.72, 1.65, 0.90), leg formula I-IV-II-III, dusky yellowish brown, robust and strongly developed, no annuli, leg supination in
Table 1
. Abdomen: 1.55 long / 1.21 wide, dull grayish brown, suboval, no pattern on dorsum, sparsely clothed with long blackish brown hair (
Fig. 4A
). Palp: 2.10 (0.75, 0.25, 0.30, -, 0.80), tibia longer than patella, thumb-like PA blunt and conspicuously protrudent with 4 peg setae (
Fig. 4H
), RTA modified very long and deep, embolus long, slender and curved windingly, shorter than conductor, embolus tip separated from the PCo, conductor large auricle-shaped with broad ladle-like PCo, embolus parallel and separated from the margin of conductor, almost close to the PCo (
Fig. 4D–H
).
Distribution.
Korea
(Mt. Naejangsan, Jeongeup-si,
Jeollabuk-do
; Mt. Deogyusan, Muju-gun,
Jeollabuk-do
). Only known from the
type
localities.
FIGURE 5.
Distribution of four new
Cybaeus
species
in Korea.
Remarks.
The specimens of
Cybaeus pseudoauriculatus
were collected in a pitfall trap in mixed forest leaf litter in mountainous terrain (alt.
235 m
in Mt. Najangsan and alt.
261 m
in Mt. Deogyusan).