caa a22 4500 388110554 CHVBK 20180307125352.0 cr unu---uuuuu 161130s1999 xx s 000 0 eng 10.1017/S0263593300002492 doi S0263593300002492 pii (NATIONALLICENCE)cambridge-10.1017/S0263593300002492 Dunlop Jason A. Institut für Systematische Zoologie, Museum für Naturkunde, D-10115 Berlin, Germany A redescription of the Carboniferous arachnid Plesiosiro madeleyi Pocock, 1911 (Arachnida: Haptopoda) [Elektronische Daten] [Jason A. Dunlop] Plesiosiro madeleyi Pocock, 1911, the monotypic representative of the fossil order Haptopoda Pocock, 1911 from the British Middle Coal Measures (Upper Carboniferous, Westphalian B) of Coseley, Staffordshire, is redescribed. A specimen from Sparth Bottoms, Lancashire is not a Plesiosiro and is referred to Arthropoda incertae sedis. Plesiosiro was probably a predator, having tooth-like projections on the femora for prey capture, and shows adaptations of the limbs for crawling in narrow spaces. The uncertain nature of the chelicerae, eyes and respiratory organs makes resolving the phylogenetic position of Plesiosiro difficult, though Haptopoda deserves its status as a separate order. Plesiosiro resembles both cythophthalmid and trogulid opilionids. Its broad prosoma-opisthosoma junction could be interpreted as a synapomorphy for Plesiosiro + Opiliones, but this character is not unique to these orders. Alternatively, Plesiosiro has a large, ventral opisthosomal sclerite. This is interpreted here as a genital operculum, a synapomorphy for Tetrapulmonata, and Plesiosiro is tentatively referred to this clade. Based on the synapomorphies of a divided sternum and subdivided telotarsi a relationship of the form: (Plesiosiro (Amblypygi (Thelyphonida + Schizomida))) is proposed. Copyright © Royal Society of Edinburgh 1999 Amblypygi nationallicence arthropod nationallicence Coal Measures nationallicence Coseley nationallicence fossil nationallicence Opiliones nationallicence phylogeny nationallicence systematics nationallicence Thelyphonida nationallicence Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 90/1(1999), 29-47 0263-5933 90:1<29 1999 90 TRE https://doi.org/10.1017/S0263593300002492 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0263593300002492 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Dunlop Jason A. Institut für Systematische Zoologie, Museum für Naturkunde, D-10115 Berlin, Germany NATIONALLICENCE 773 0- Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 90/1(1999), 29-47 0263-5933 90:1<29 1999 90 TRE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge