Stylocellus Westwood 1874
Creators
Description
Stylocellus Westwood, 1874
Stylocellus Westwood, 1874: 200; Pocock 1897: 290 –291; Roewer 1926: 263; Giribet 2000: 68. Removed from synonymy: Leptopsalis Thorell, 1882: [synonymized by Thorell (1890: 106), but restored by Clouse and Giribet (in press)]
Type species: Stylocellus sumatranus Westwood, 1874, by monotypy.
Other species included: Stylocellus lornei sp. nov.
Comments: The two species in this genus are nearly identical in size and proportion (Fig. 7; males approximately 6 mm long and 3 mm wide across the opisthosoma), and the wider measurement across the ozophores of S. sumatranus could easily be caused by its pinning, which has clearly split and widened the ventral prosomal complex. Still, given the multiple evolution of various sizes and associated features in the family, the similar proportions could be causing these species to appear more closely related than they truly are. Thus, the diagnosis relies on other features I think give the two species a strong overall resemblance and which have clearly influenced their placement in morphometric phylogenies. Diagnostic features from the male fourth tarsus are based solely on S. lornei, sp. nov., as the type of S. sumatranus is missing this appendage.
Description: Stylocellinae, with the following: anal gland pores and medial anal plate sculpturing present; second cheliceral article more than 2/3 granulated, granulations stopping before joint with third article, bordered by long lateral smooth patch and low ridge that extends to third article joint; Rambla’s organ at same level with surrounding tarsus, lacking microgranulations, the larger, pointed tuberculate-granulations sometimes smaller or missing at the center of the organ but mostly continuing across as on the surrounding cuticle; ozophores long and parallel-sided, almost widening at the tip; ventral prosomal complex large, with fourth coxae meeting for a length longer than the gonostome, distinct sternum present, and second coxae broadly meeting; sternal opisthosomal sulci between sternites 3 and 4, 4 and 5, and 5 and 6 distinct and sinusoidal.
Distribution: Sumatra and Phayam Island, off the west coast of Peninsular Thailand
Notes
Files
Files
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Stylocellidae
- Genus
- Stylocellus
- Kingdom
- Animalia
- Order
- Opiliones
- Phylum
- Arthropoda
- Scientific name authorship
- Westwood
- Taxon rank
- genus
- Taxonomic concept label
- Stylocellus Westwood, 1874 sec. Clouse, 2012
References
- Westwood, J. O. (1874) Thesaurus Entomologicus Oxoniensis; or, illustrations of new, rare, and interesting insects, for the most part contained in the collections presented to the University of Oxford by the Rev. F. W. Hope, M. A., D. C. L., F. R. S., & c. with forty plates from drawings by the author. Clarendon Press, Oxford.
- Pocock, R. I. (1897) Descriptions of some new Oriental Opiliones recently received by the British Museum. Annals and Magazine of Natural History, Series 6, 19, 283 - 292.
- Giribet, G. (2000) Catalogue of the Cyphophthalmi of the world (Arachnida, Opiliones). Revista Iberica de Aracnologia, 2, 49 - 76.
- Thorell, T. (1882) Descrizione di alcuni Aracnidi inferiori dell' Arcipelago Malese. Annali del Museo Civico di Storia Naturale di Genova, 18, 21 - 69.
- Thorell, T. (1890 a) Aracnidi di Nias e di Sumatra raccolti nel 1886 dal Sig. E. Mondigliani. Annali del Museo Civico di Storia Naturale di Genova, 2 a, 10, 5 - 106.