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Fig. 8 | BMC Biology

Fig. 8

From: Tube-dwelling in early animals exemplified by Cambrian scalidophoran worms

Fig. 8

Maximum clade compatibility tree from a Bayesian analysis using an Mkv+Γ model and a backbone enforcing basal Kinorhyncha and Loricifera. a Full tree. Bold branches lead to extant lineages. Numbers next to node are posterior probabilities. Circled numbers at nodes are key apomorphic characters: 1, eversible introvert in adult. 2, retractable mouth cone and oral elements. 3, eversible pharynx lined with teeth in multiple rows. 4, scalids distributed only at anterior part of Zone I, one to several rows of plates in each annulation, paired anal hooks or setae. 5. twenty-five longitudinal rows of scalids arranged quincunxially (Additional file 1: Fig. S7. This trait may be shared convergently by priapulids and Selkirkia) and terminal anus. 6, multi-subdivisions Zone I. 7. cuticular and annulated tube. 8. The arrangement of crown priapulid scalids shows 8+9+(8+8+9) pattern with the exception of fossil taxa. b Simplified topology showing the position of Selkirkia and harmonic mean (−1081.42). Dashed lines mark branches supported by extremely low posterior probabilities (≤0.1). The dotted line denotes the instability of Ancalagon minor

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