Retrooecobius lwini Jiang & Li, 2022

Xin, Yafei, Jiang, Tongyao, Yao, Zhiyuan & Li, Shuqiang, 2022, Twenty new spider species (Arachnida: Araneae) from Late Cretaceous Kachin amber (Myanmar), Zoological Systematics 47 (1), pp. 1-65 : 3

publication ID

https://doi.org/ 10.11865/zs.2022101

publication LSID

lsid:zoobank.org:pub:1C62670D-1CEB-4A0C-8A12-D8824F6B61DA

persistent identifier

https://treatment.plazi.org/id/743FB854-0924-BC67-B1F1-CE4AFA8DFC2D

treatment provided by

Felipe (2022-10-09 06:16:45, last updated by Plazi 2023-11-07 18:26:35)

scientific name

Retrooecobius lwini Jiang & Li
status

sp. nov.

Retrooecobius lwini Jiang & Li , sp. nov. ( Figs 1–3 View Figure 1 View Figure 2 View Figure 3 )

Holotype. Male (IZCAS-Ar42683Fo). Late Cretaceous amber from Hukawng Valley. Syninclusion includes one neuropteran.

Etymology. The species name is a popular Burmese boy’s name and means “outstanding”; noun in apposition.

Diagnosis. Retrooecobius lwini Jiang & Li , sp. nov. can be distinguished from R. chomskyi Wunderlich, 2015 (figs 313–321, photos 149–153), the only species of the genus described based on male specimen before, by the clypeus. R. chomskyi has a clypeal apophysis, while the new species does not have. In addition, the palp of R. chomskyi was obscured.

Description. Male. Total length 3.09; carapace 1.33 long, 1.25 wide; opisthosoma 1.76 long, 0.88 wide. Left palp: - (0.29 + - + -), left leg I: - (1.07 + - + - + 1.19 + 0.64), leg II: - (- + - + - + 1.17 + 0.71), leg III: 4.30 (0.99 + 0.40 + 0.78 + 1.18 + 0.95), leg IV: 4.87 (1.15 + 0.46 + 1.01 + 1.37 + 0.88); right palp: - (0.67 + - + -), right leg I: 4.44 (1.25 + 0.45 + 0.90 + 1.12 + 0.72), leg II: 4.39 (1.34 + 0.41 + 0.91 + 1.20 +0.53), leg III: - (1.56 + - + - + 1.31 + 0.75), leg IV: 5.28 (1.68 + 0.41 + 0.97 + 1.24 + 0.98). Eye sizes and interdistances: ALE 0.09, AME 0.07, PLE 0.07, PME 0.08; AME–AME 0.08, AME– ALE 0.04, PME–PLE 0.03, PME–PME 0.08. Habitus as in Figs 2A–B View Figure 2 . Carapace has an obvious fovea, longer than wide, brown, covered with dark brown setae. Sternum brown, with dense brown setae. Labium not visible. Legs with long setae, approximate to width of leg segment. Opisthosoma elongate, black-brown. Anterior and posterior spinnerets ( Fig. 2D View Figure 2 ) are approximately the same length.

Palp ( Figs 1A–D View Figure 1 , 3 View Figure 3 ). Ratio of femur length to cymbial length 2.71; median apophysis triangular, sclerotized.

Wunderlich, J. 2015. On the evolution and the classification of spiders, the Mesozoic spider faunas, and descriptions of new Cretaceous taxa mainly in amber from Myanmar (Burma) (Arachnida: Araneae). In: Wunderlich, J. (ed.), Beitrage zur Araneologie, Vol. 9. Hirschberg, Germany. pp. 21 - 408.

Gallery Image

Figure 1. Retrooecobius lwini Jiang & Li, sp. nov., holotype male (IZCAS-Ar42683Fo). A. Left palp, retrolateral view; B–C. Right palp (B. Retrolateral view; C. Ventral view); D. Left palp, ventral view. Scale bars=0.10mm.

Gallery Image

Figure 2. Retrooecobius lwini Jiang & Li, sp. nov., holotype male (IZCAS-Ar42683Fo). A–B. Habitus (A. Dorsal view; B. Ventral view); C. Ocular area, dorsal view; D. Spinnerets, ventral view. Scale bars: A–B=0.50mm; C–D=0.10mm.

Gallery Image

Figure 3. Retrooecobius lwini Jiang & Li, sp. nov., holotype male (IZCAS-Ar42683Fo), left palp, retrolateral view. Scale bar = 0.10mm.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Oecobiidae

Genus

Retrooecobius