Chilon undulatus Sørensen, 1896

Bauer, Christian & Prieto, Carlos E., 2009, Three new Assamiidae (Arachnida: Opiliones) from Cameroon, with a redescription of Chilon robustus and comments on related species, Zootaxa 2059, pp. 1-22 : 6-7

publication ID

https://doi.org/ 10.5281/zenodo.186783

DOI

https://doi.org/10.5281/zenodo.5617791

persistent identifier

https://treatment.plazi.org/id/E04EEA29-FFD9-A833-FF35-54544D7105D9

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Plazi (2016-04-19 09:08:50, last updated 2024-11-27 07:40:32)

scientific name

Chilon undulatus Sørensen, 1896
status

 

Chilon undulatus Sørensen, 1896 View in CoL

Figs 44–47 View FIGURES 36 – 47

Chilon undulatus Sørensen, 1896: 190 View in CoL [Kitta, Cameroon]; Roewer, 1923: 278 [Kitta and Edea, Cameroun]; Roewer, 1927: 364 [Fernan Vaz, Gabon]; Roewer, 1935: 278 [Kitta, Edea, Jaunda and Gabon].

Chilon robustus Sørensen, 1896: 190 View in CoL (unjustified synonymization by Starǫga, 1992).

Material studied. 31 33 & ƤƤ syntypes of Chilon undulatus ( NHRS): Kamerun, W. Sjöstedt leg., 1891.

Descriptive notes ( Figs 44–47 View FIGURES 36 – 47 ). Penis length, 1.5. Penis stalk dorso-ventrally widened at the distal end, and connected to the penial head by a narrowed neck reinforced by a dorsal keel. Penial head disc-shaped, clearly broader than long, with a median notch in distal margin, divided into two latero-distal setose incrassate bulges enclosing the glans. Sides of penis head with translucent keels. Ventral side with three pairs of small setae, two of them (the outer one shorter) pointing toward the median notch, and the third one situated on the lateral bulges and pointing laterad. Lateral side with three pairs of large proximad-directed foliate setae and with a basal keel. Dorsal side with three pairs of small setae, two apical ones pointing distad and the third, sitting on lateral bulges, pointing posteriad and flanking the glans. Glans, see Fig. 46 View FIGURES 36 – 47 .

Remarks. Staręga (1992) synonymised Chilon undulatus with C. robustus on the basis of penial morphology but his decision was not documented by drawings. In the NHMS samples there are no male syntypes with their penises removed and therefore only external morphology was studied or the removed penises were carefully placed back in the opisthosoma. In the latter case, a superficial penial similarity between the two species could have been the reason for that spurious synonymy.

Roewer, C. F. (1923) Die Weberknechte der Erde. Systematische Bearbeitung der bisher bekannten Opiliones. Gustav Fischer, Jena, 1116 pp.

Roewer, C. F. (1927) Cyphophthalmi, Phalangodidae, Assamidae. Weitere Weberknechte I. Abhandlungen herausgegeben vom Naturwissenschaftlichen Verein zu Bremen, 26 (2), 261 - 402 + pl. 1.

Roewer, C. F. (1935) Alte und neue Assamiidae. Weitere Weberknechte VIII. Veroffentlichungen aus dem Deutschen Kolonial- und Ubersee-Museum in Bremen, 1 (1), 1 - 168 + pls 1 - 9.

Sorensen, W. (1896) Opiliones Laniatores a cl. Dr. Yngve Sjostedt in Kamerun (Africa Centrali) collectos. Entomologisk Tidskrift, 17 (3), 177 - 202.

Staroga, W. (1992) An annotated check-list of Afrotropical harvestmen, excluding the Phalangiidae (Opiliones). Annals of the Natal Museum, 33 (2), 271 - 336.

Gallery Image

FIGURES 36 – 47. Chilon spp., penis head in ventral (36, 40, 44), lateral (37, 41, 45) and dorsal view (38, 42, 46), and total penis in dorsal view (39, 43, 47). 36 – 39, Chilon robustus Sørensen, 1896 (Buea, MRAC / 135327). 40 – 43. Chilon robustus Sørensen, 1896 (syntype, Kamerum, NHRS). 44 – 47. Chilon undulatus Sørensen, 1896 (syntype, Kamerum, NHRS). Scale bars: Left 0.1 mm, right 1 mm.

NHRS

Swedish Museum of Natural History, Entomology Collections

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Opiliones

Family

Assamiidae

Genus

Chilon