Stylocellinae Hansen & Sorensen 1904

Clouse, Ronald M., 2012, The lineages of Stylocellidae (Arachnida: Opiliones: Cyphophthalmi), Zootaxa 3595 (1), pp. 1-34 : 6-7

publication ID

https://doi.org/ 10.11646/zootaxa.3595.1.1

publication LSID

lsid:zoobank.org:pub:0E34F9DE-B76C-4197-94D0-5A08A1F7C534

DOI

https://doi.org/10.5281/zenodo.5866099

persistent identifier

https://treatment.plazi.org/id/296DA64C-7062-997F-DEAA-F8B4AE26F92F

treatment provided by

Plazi

scientific name

Stylocellinae Hansen & Sorensen 1904
status

 

Stylocellinae Hansen & Sorensen 1904 View in CoL

Comments: The first large molecular analysis to include both genera of Stylocellinae ( Stylocellus —represented at that time by the Phayam Island species, described below—and Meghalaya) recovered the subfamily as monophyletic under all cost schemes, with 99% parsimony bootstrap support and 100% likelihood bootstrap support ( Clouse & Giribet 2010), and the same result was obtained in the most recent combined molecular and morphological analysis of Cyphophthalmi ( Giribet et al. 2012). Clearly, molecular data contain a robust set of characters for this subfamily, but finding a morphological synapomorphy is more difficult. Meghalaya ’s morphology, the most distinctive in the family, is quite autapomorphic: the large, rectangular gonostome, scooplike male tarsus IV, thickened male tibia III, and deep ventral opisthosomal depression are not found in other genera at all ( Giribet et al. 2007). Both Meghalaya and Stylocellus lornei , sp. nov., do have common features in their modified areas on the male fourth tarsi (what I interpret here as homologous to the Rambla’s organ in Fangensinae), and perhaps the deeply sinusoidal anterior sternal opisthosomal sulci of Stylocellus are a result of the same ecological or developmental process that has resulted in the ventral depression of Meghalaya.

Description: Eyes present; anal gland pores variable; chelicerae with distinct second ventral process, first process reduced; chelicerae claw-like; granulations on second cheliceral article variable, low ridge variable; Rambla’s organ diffuse, large, lacking microgranulations but often with larger tuberculate-granulations encroaching irregularly, with micropores and microtubercles bearing pores; ozophores pronounced and pointing forward; posterior prosoma not especially large or bulging, the widest part of body usually across the opisthosoma ( Fig. 4 View FIGURE 4 , B–C); lateral edges of fouth coxae tapered anteriorally ( Fig. 5 View FIGURE 5 , B–C); ventral prosomal complex variable; sternum variable; body profile deep, arching of dorsal scutum variable ( Fig. 6 View FIGURE 6 , B–C); sternal opisthosomal sulci between sternites 3 and 4, 4 and 5, and 5 and 6 variable ( Fig. 5 View FIGURE 5 , B–C); posterior gonostome edge weakly concave.

Included genera: Stylocellus Westwood, 1874 (Type genus) and Meghalaya Giribet, Sharma & Bastawade, 2007

Distribution: Sumatra (more specific locality information not recorded), southern, central, and northern Thailand, and northeastern India.

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