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Fig. 1 | BMC Evolutionary Biology

Fig. 1

From: Comparison of ventral organ development across Pycnogonida (Arthropoda, Chelicerata) provides evidence for a plesiomorphic mode of late neurogenesis in sea spiders and myriapods

Fig. 1

Investigated pycnogonid species and two hypotheses on their phylogenetic relationships. a Callipallene brevirostris (Johnston, 1837). Adult male bearing egg packages, dorsal view, 70% ethanol preservation. b Stylopallene cheilorhynchus Clark, 1963. Dorsal view of live female. c Tanystylum orbiculare Wilson, 1878. Adult female, dorsal view, 70% ethanol preservation. d Pycnogonum litorale Strøm, 1762. Male clinging to female during copula, dorsal view. e Meridionale sp. (member of “variabilis”-complex sensu Arango and Brenneis [45]). Antero-ventral view of live female. f Phoxichilidium femoratum (Rathke, 1799). Adult male, dorsal view, 70% ethanol preservation. g Distribution of the studied species shown against the backbone of two competing hypotheses of pycnogonid relationships [40, 41]. Note that the position of the genus Phoxichilidium remains questionable in the left cladogram, owing to its rather surprising separation from the genus Anoplodactylus. Both genera are generally accepted to constitute the morphologically and developmentally strongly supported taxon Phoxichilidiidae

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BMC Ecology and Evolution

ISSN: 2730-7182

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