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Figure 4 in A revision of Micropodarke (Psamathini, Hesionidae, Polychaeta)

Figure 4. LM pictures of Micropodarke dubia from Hong Kong. (A) Anterior end, showing proboscis diaphragm, eyes visible as dark spots on top of picture; (B) Chaetae, median parapodium; (C) median parapodium, ventrolateral view. Scales unknown.

Figure 3 in A revision of Micropodarke (Psamathini, Hesionidae, Polychaeta)

Figure 3. SEM pictures of Micropodarke dubia from Hong Kong. (A) Anterior end, dorsal view; (B) anterior end, ventral view; (C) terminal part of everted proboscis; (D) adhesive papilla; (E) chaetae from median parapodium, blades with prolonged teeth in the middle; (F) posterior end, ventral view. Scale bars: 0.1 mm (B, A same scale); 0.05 mm (C, D, F); 10 mm (E).

Figure 5 in A revision of Micropodarke (Psamathini, Hesionidae, Polychaeta)

Figure 5. SEM pictures of Micropodarke dubia from California. (A) Anterior end, dorsal view; (B) anterior end, left side; (C) median parapodia, left side, dorsal view; ventral cirri segment 3 is regenerating; first adhesive papilla visible behind neuropodium segment 3; (D) median parapodia, ventral view; (E) adhesive papilla; (F) posterior end, ventral view; the elongated, attached object on the right side is an unknown commensal. Scale bars: 100 mm (A, C, D); 50 mm (B, E, F).

Figure 6 in A revision of Micropodarke (Psamathini, Hesionidae, Polychaeta)

Figure 6. Geographical distribution of Micropodarke dubia. (.) Represents records based on examined specimens and (Z) records from the literature.

Figure 2 in A revision of Micropodarke (Psamathini, Hesionidae, Polychaeta)

Figure 2. SEM pictures of Micropodarke dubia from Sagami Bay, Japan. (A) Anterior end, dorsal view; (B) median neurochaetae, showing blade with prolonged basal teeth; (C) adhesive papillae, left side, ventral view; (D) close-up of adhesive papilla. Scale bars: 0.1 mm (A, C); 10 mm (B); 50 mm (D).

Figure 1 in A revision of Micropodarke (Psamathini, Hesionidae, Polychaeta)

Figure 1. Relationships between number of segments and length in Micropodarke dubia. Specimens from (•) the Great Barrier Reef; (Z) Papua New Guinea; (O) California; (.) western Canada; (m) Hong Kong; (n) Japan.

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FIGURE 1. Micropodarke pleijeli new species. A. Paratype MZUSP388 in Hesionidae Grube, 1850 (Annelida: Polychaeta) from South-Southeastern Brazil, with descriptions of four new species

FIGURE 1. Micropodarke pleijeli new species. A. Paratype MZUSP388, anterior region, right dorsolateral view; B. Same, parapodium 11, left side view; C. Same, parapodium 11, right side view; D. Parapodium 6 showing the ventral adhesive papilla (vap), right side view; E. Supra-acicular heterogomph bidentate falciger, with hood and spur; F. Subacicular heterogomph bidentate falciger, without hood; G. Neurochaeta elongated and slender.

FIGURE 2 in Micropodarke fujianensis n. sp. (Annelida: Hesionidae) from Fujian, China

FIGURE 2. LM and SEM micrographs of Micropodarke fujianensis n. sp. and M. cf. dubia from the southeastern China Seas. A–C. M. fujianensis n. sp., holotype, XMU-Pol-2021-227. A. LM, dorsal view; B. LM, ventral view; C. SEM, anterior view. D–F. M. cf. dubia, XMU-Pol-2021-062. D. LM, dorsal view; E. LM, ventral view; F. SEM, anterior view. Abbreviations: la, lateral antenna; pa, palp; pha, pharynx; tc, tentacular cirrus; dc, dorsal cirrus; ap, adhesive papilla; vc, ventral cirrus; pp, pharynx papilla; pr, prostomium. Scale bars: A, B, D, E: 200 μm; C, F: 100 μm.

FIGURE 3 in Micropodarke fujianensis n. sp. (Annelida: Hesionidae) from Fujian, China

FIGURE 3. Parapodia and chaetae of Micropodarke fujianensis n. sp. and M. cf. dubia from the southeastern China Seas. A–E., M. fujianensis n. sp. A. XMU-POL-2021-227, parapodium, chaetiger 16, posterior view; B. Same specimen, heterogomph falcigers, left, LM, chaetiger 16, right, SEM, anterior chaetiger; C. MBM286065, heterogomph falcigers, middle chaetigers; D. XMU-POL-2021-229, heterogomph falcigers, chaetiger 14; E. Same specimen, neuropodial acicula, chaetiger 14. F–I. M. cf. dubia. F. XMU-Pol-2021-119, parapodium, chaetiger 21, posterior view; G. Same specimen, heterogomph falcigers, chaetiger 21; H. XMU-Pol-2021-062, heterogomph falcigers, LM (left) and SEM (right), chaetiger 13; I. XMU-Pol-2021-069, heterogomph falcigers, middle chaetiger. Yellow arrows point to aciculae, red arrows point to basal teeth of blades. Scale bars: A, F: 100 μm; G–I: 20 μm; B–E: 10 μm.

FIGURE 1 in Micropodarke fujianensis n. sp. (Annelida: Hesionidae) from Fujian, China

FIGURE 1. Distribution of Micropodarke species around the world (A) and records from the China Seas (B). A. Type localities (red circles with numbers): 1, Micropodarke dubia (Hessle, 1925), Sagami Bay; 2, M. trilobata Hartmann-Schröder, 1983, Western Australia; 3, M. "dubia" Pleijel & Rouse, 2005 (not Hessle, 1925), California; 4, M. pleijeli Rizzo & Salazar-Vallejo, 2014, central coast of Brazil; 5, M. "dubia" Pleijel & Rouse, 2005 (not Hessle, 1925), Hong Kong; 6, Micropodarke fujianensis n. sp., Fujian. Blue triangles represent Micropodarke COI gene sequences recorded in GenBank and BOLD Systems (Table 2). B. Historical records of Micropodarke species (blue circles, reference list is available from the corresponding authors upon request) and M. cf. dubia and M. fujianensis n. sp. specimens used in this study (red circles).

FIGURE 4 in Micropodarke fujianensis n. sp. (Annelida: Hesionidae) from Fujian, China

FIGURE 4. Phylogenetic trees generated by maximum likelihood (ML) analyses based on the partial sequences of five genes. A. COI (597 bp, IQ-tree model: GTR+F+I+G4); B. 16S rRNA (382 bp, IQ-tree model: TIM2+F+R2); C. 18S rRNA (934 bp, raxmlGUI model: GTR+I); D. 28S rRNA (736 bp, IQ-tree model: TIM3+F+I); E. histone H3 (281 bp, IQ-tree model: TNe). Only bootstrap (BS) values ≥ 50 are shown at nodes. Vouchers and their GenBank accession numbers of the specimens used are listed in Table 2. The scale bar indicates the number of substitutions per site.