Nuchal epaulettes extending to half of chaetiger 2, large eye spots .................................. ................................................................................................... M. rangiroaensis (p. 155) Nuchal epaulettes extending to between end of chaetiger 3 and beginning of chaetiger 5, small eye spots ................................................................................... M. dentalia (p. 127) 85 (83) Trepan with 4–5 large and 25–39 small teeth, 1 large alternating with 4–13 small. Small teeth fused with adjacent large teeth ........................................... M. langerhansi (p. 140) Trepan with 8–10 large and 14–21 small teeth, 1 large alternating with 1–3 small. Small teeth not fused with adjacent large teeth ................................ M. brachycephala (p. 120) Procerini trib. n.

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A Additional features: thin bayonet chaetae, subdistally denticulated. B Additional features: large trepan teeth.

C Additional features: well­developed ciliated ridge on palps. D Additional features: unidentate compounds in anterior chaetigers. a Reference: Ben­Eliahu 1977.

b Reference: Imajima 1966.

c Reference: Langerhans 1879.

d Reference: Hartmann­Schröder 1962.

e Reference: Imajima 1967.

Pharynx sinuationTrepan teethProventricle in chaetigerReproduc­ tive modeAdditional fea­ turesDistri­ butionReferences branchiata1– several1 20 uneq; 1L+(1–3)S6–8(2–3)50S; ASFurcating nuchal epaulettesANT1Averincev, 1972 clavataseveral24 eq5(1)20S; ASNEAlongi­ pharyngeaseveral20 eq4–5(1)18?SWP pectinans1217 uneq; 1L+(1–2)S5–6(2)26S; ASEIO2Hartmann­ Schröder, 1989 spirifer128 uneq; 1L+(1–3)S3(1)25S; ASSWP,Rows of muscle cells –30 EIO

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A Additional features: bidentate simple chaetae in chaetiger 1–4 B Additional features: uni­ and bidentate simple chaetae in chaetiger 1–4 C Additional features: only unidentate simple chaetae in all chaetigers D Additional features: compounds and simple chaetae in all chaetigers E.

Additional features: flattened, lanceolate cirri F Additional features: brown spots at base of dorsal cirri. G Additional features: fusiform anterior appendages, only simple chaetae. a Reference: Gidholm 1967.

b Reference: Imajima 1966

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A Additional features: two small spines at base of large teeth B Additional features: cirri from chaetiger 3 flattened C Additional features: very large parapodial lobes a Reference: San Martín 1994.

b Reference: Imajima 1966

Annenkova 1934 &

Linnean name definition. Type genus Proceraea Ehlers, 1864 .

Node­based name definition. Procerini refers to the least inclusive clade comprising Imajimaea zonata (Mohammad, 1973), Imajimaea draculai (San Martín & López, 2002), Virchowia [Langerhans, 1879] Nygren, 200X, Levidorum [Hartman, 1967] Nygren, 200X, and Proceraea [Ehlers, 1864] Nygren, 200X.

Apomorphies. Clade supported by six morphological apomorphies (Fig. 4): 1) nuchal epaulettes extend to end of tentacular segment (character 8), character state change is a parallelism, character later reversed within clade, character further changed within clade, character state unknown in some taxa; 2) cirrostyles alternate in length present (character 16), character state change is a parallelism, character later reversed within clade, character state unknown in some taxa; 3) cirrophores on short cirri absent (character 17), character state change is a parallelism, character later reversed within clade, character state unknown in some taxa; 4) cirrophores on long cirri absent (character 18), character state change is a parallelism, character later reversed within clade, character state unknown in some taxa; 5) chaetal teeth in median and posterior chaetigers with distal tooth smaller than subdistal tooth (character 31), character state change is a parallelism, character later reversed within clade, character state unknown in some taxa; 6) reproductive mode equals anterior scissiparity (character 51), other MPRs possible, character state unknown in some taxa.