Micronephthys longicornis ( Perejaslavtseva, 1891 )

Kuş, Sevgi, Kurt, Güley & Çinar, Melih Ertan, 2021, Nephtyidae (Annelida: Polychaeta) from the Sea of Marmara and Black Sea, with descriptions of two new species, Zootaxa 5060 (2), pp. 183-214 : 191-195

Micronephthys longicornis ( Perejaslavtseva, 1891)

( Figure 5 )

Nephthys longicornis Perejaslavtseva, 1891: 248–249 , pl. VII, Figs. 2a–c .

Micronephthys stammeri Augener, 1932: 678–679 , Fig. 2 ; Hartman 1950: 131; Banse 1959: 302–305, Fig. 6 ; Marinov 1977: 120, pl. 14, Figs. 2a–2d , pl. 37, Fig. 3 ; Kiseleva 2004: 110–111, Fig. 25; Ravara et al. 2010: 27 , Fig. 9 ; Murray et al. 2015: 428 , Figs. 10–11 .

Micronephthys maryae San Martín, 1982: 427–434 Figs. 1-3 ; Laborda 2004: 416, Figs. 152A–C.

Micronephthys longicornis Dnestrovskaya & Jirkov, 2019: 391–400 , Figs. 1 , 2 , 4 .

Material examined. Sea of Marmara: ESFM-POL/2013-1306 , 06 June 2013, station Y1, 40°00’32’’N, 26°13’04’’E, 25 m, mud, 1 specimen ; Black Sea: ESFM-POL/2014-621 , 12 July 2014, station TRK1, 41°55’34”N, 28°12’27”E, 21 m, coarse sand with shell fragments, 15 specimens ; ESFM-POL/2014-622 , 12 July 2014, station TRK7, 41°18’40”N, 29°40’10”E, 27 m, mud with shell fragments, 2 specimens ; ESFM-POL/2014-620 , 13 July 2014, station TRKE1 , 41°23’36”N, 31°38’11”E, 21 m, mud with shell fragments, 26 specimens ; ESFM-POL/2014-623 , 15 July 2014, station TRK22, 42°2’34”N, 33°49’33”E, 25 m, mud with shell fragments, 29 specimens ; ESFM- POL/2014-624, 15 July 2014, station TRK25, 42°16’60”N, 34°56’14”E, 21 m, mud with shell fragments, 9 specimens; ESFM-POL/2014-625 , 16 July 2014, station TRK28, 42°6’20”N, 35°15’0”E, 21 m, coarse sand with shell fragments, 142 specimens ; ESFM-POL/2014-626 , 16 July 2014, station TRK32, 42°0’57.24”N, 35°9’28.51”E, 55 m, mud with phytodetritic material, 5 specimens ; ESFM-POL/2014-627 , 17 July 2014, station TRK34Y, 41°33’40”N, 36°34’19”E, 21 m, mud with phytodetritic material, 2 specimens ; ESFM-POL/2014-628 , 17 July 2014, station TRK37, 41°19’40”N, 36°32’10”E, 10 m, mud with shell fragments, 1 specimen ; ESFM-POL/2014- 629 , 16 July 2014, station TRK43, 41°32’60”N, 36°40’40”E, 8 m, mud with phytodetritic material, 5 specimens ; ESFM-POL/2014-630 , 18 July 2014, station TRK46, 41°2’43”N, 38°3’20”E, 21 m, mud with shell fragments, 64 specimens ; ESFM-POL/2014-631 , 19 July 2014, station TRK53, 41°0’54”N, 38°27’20”E, 52 m, mud with phytodetritic material, 5 specimens ; ESFM-POL/2014-632 , 19 July 2014, station TRK55, 41°1’45”N, 39°54’15”E, 21 m, mud with shell fragments, 23 specimens ; ESFM-POL/2014-633 , 20 July 2014, station TRK61, 41°3’60”N, 40°38’24”E, 20 m, mud and shell fragments with phytodetritic material, 97 specimens ; ESFM-POL/2015-272 , 02 July 2015, station TRK1, 41°55’34”N, 28°12’27”E, 21 m, shell fragments with fine sand, 116 specimens ; ESFM- POL/2015-273, 03 July 2015, station TRK7, 41°18’40”N, 29°40’10”E, 21 m, shell fragments with fine sand, 4 specimens; ESFM-POL/2015-274 , 03 July 2015, station TRK10, 41°19’40”N, 30°47’55”E, 20 m, shell fragments with fine sand, 9 specimens ; ESFM-POL/2015-271 , 04 July 2015 , TRKE1 , 41°23’36”N, 31°38’11”E, 13 m, shell fragments with phytodetritic material, 4 specimens ; ESFM-POL/2015-275 , 04 July 2015, station TRK 13, 18 m, fine sand with shell fragments and detritic material, 41°37’20”N, 31°51’3”E, 4 specimens ; ESFM-POL/2015-276 , 04 July 2015, station TRK13A, 41°35’23.22”N, 32°2’4.73”E, 17 m, shell fragments with fine sand, 5 specimens ; ESFM-POL/2015-277 , 05 July 2015, station TRK19, 42°6’47”N, 33°3’35”E, 40 m, clay with shell and detritic fragments, 14 specimens ; ESFM-POL/2015-278 , 05 July 2015, TRK22, 42°2’34”N, 33°49’33”E, 21 m, shell fragments and detritic material, 21 specimens ; ESFM-POL/2015-279 , 06 July 2015, station TRK28, 42°6’20”N, 35°15’0”E, 17 m, shell fragments with fine sand detritic material, 94 specimens ; ESFM-POL/2015-280 , 07 July 2015, TRK32, 42°0’57.24”N, 35°9’28.51”E, 70 m, mud with clay and detritic material, 7 specimens ; ESFM- POL/2015-281, 08 July 2015, station TRK34Y, 41°33’40”N, 36°34’19”E, 20 m, mud with fine sand and detritic material, 21 specimens; ESFM-POL/2015-282 , 08 July 2015, station TRK37, 41°19’40”N, 36°32’10”E, 9 m, mud with fine sand and shell fragments, 7 specimens ; ESFM-POL/2015-283 , 09 July 2015, station TRK46, 41°2’43”N, 38°3’20”E, 22 m, coarse and fine sand with shell fragments, 202 specimens ; ESFM-POL/2015-285 , 11 July 2015, station TRK55, 41°1’45”N, 39°54’15”E, 35 m, shell fragments with detritic material, 13 specimens ; ESFM- POL/2016-214, 24 July 2016, station TRK1, 41°23’36”N, 31°38’11”E, 12 m, mud with shell fragments, 64 specimens; ESFM-POL/2016-215 , 23 July 2016, staiton TRK7, 41°18’40”N, 29°40’10”E, 23 m, fine sand with shell fragments, 7 specimens ; ESFM-POL/2016-216 , 24 July 2016, station TRK10, 41°19’40”N, 30°47’55”E, 20 m, shell fragments with phytodetritic material, 45 specimens ; ESFM-POL/2016-213 , 24 July 2016, station TRKE1 , 41°23’36”N, 31°38’11”E, 12 m, mud with shell fragments, 29 specimens ; ESFM-POL/2016-217 , 26 July 2016, station TRK13, 41°37’20”N, 31°51’3”E, 19 m, fine sand with shell fragments, 46 specimens ; ESFM-POL/2016- 218 , 26 July 2016, station TRK16, 41°43’10”N, 32°4’60”E, 20 m, mud with phytodetritic material, 13 specimens ; ESFM-POL/2016-247 , 25 July 2016, station TRK19, 42°6’47”N, 33°3’35”E, 45 m, mud with shell fragments, 12 specimens ; ESFM-POL/2016-219 , 25 July 2016, station TRK22, 42°2’34”N, 33°49’33”E, 22 m, shell fragments with phytodetritic material, 57 specimens ; ESFM-POL/2016-220 , 26 July 2016, station TRK25, 19.5 m, 42°16’60”N, 34°56’14”E, sand with shell fragments, 9 specimens ; ESFM-POL/2016-221 , 27 July 2016, station TRK28, 42°6’20”N, 35°15’0”E, 18.8 m, mud with phytodetritic material, 78 specimens ; ESFM-POL/2016-222 , 27 July 2016, station TRK32, 42°0’57.24”N, 35°9’28.51”E, 60 m, mud with shell fragments, 17 specimens ; ESFM- POL/2016-223, 27 July 2016, station TRK34Y, 41°19’40”N, 36°32’10”E, 21 m, shell fragments with phytodetritic material, 34 specimens; ESFM-POL/2016-224 , station TRK37, 28 July 2016, 41°32’60”N, 36°40’40”E, 10.9 m, shell fragments with phytodetritic material, 12 specimens ; ESFM-POL/2016-225 , 24 July 2016, station TRK43, 41°4’2”N, 38°2’49”E, 11 m, mud with phytodetritic material, 57 specimens ; ESFM-POL/2016-226 , 28 July 2016, station TRK44, 41°2’43”N, 38°3’20”E, 51 m, shell fragments with phytodetritic material, 22 specimens ; ESFM- POL/2016-227, 29 July 2016, station TRK46, 41°0’54”N, 38°27’20”E, 32 m, mud with phytodetritic material, 38 specimens; ESFM-POL/2016-228 , 31 July 2016, station TRK55, 41°3’60”N, 40°38’24”E, 26 m, shell fragments with phytodetritic material, 16 specimens ; ESFM-POL/2017-175 , 22 July 2017, station TRK1, 41°55’34”N, 28°12’27”E, 23 m, shell fragments with phytodetritic material, 60 specimens ; ESFM-POL/2017-176 , 23 July 2017, station TRK7, 41°18’40”N, 29°40’10”E, 22.5 m, fine sand with shell fragments, 4 specimens ; ESFM-POL/2017- 177 , 24 July 2017, station TRK10, 41°19’40”N, 30°47’55”E, 20 m, shell fragments with phytodetritic material, 4 specimens ; ESFM-POL/2017-174 , 24 July 2017, station TRKE1 , 41°23’36”N, 31°38’11”E, 14 m, mud with shell fragments, 52 specimens ; ESFM-POL/2017-178 , 26 July 2016 station TRK13, 41°37’20”N, 31°51’3”E, 19 m, fine sand with shell fragments, 32 specimens ; ESFM-POL/2017-179 , 26 July 2017, station TRK17, 41°43’10”N, 32°4’60”E, 19 m, mud with phytodetritic material, 13 specimens ; ESFM-POL/2017-180 , 26 July 2017, station TRK19, 42°6’47”N, 33°3’35”E, 43 m, mud and shell fragments with phytodetritic material, 98 specimens ; ESFM- POL/2017-181, 27 July 2017, station TRK22, 42°2’34”N, 33°49’33”E, 27 m, shell fragments with phytodetritic material, 147 specimens; ESFM-POL/2017-182 , 27 July 2017, station TRK25, 42°16’60”N, 34°56’14”E, 19 m, mud with shell fragments, 36 specimens ; ESFM-POL/2017-183 , 29 July 2017, station TRK28, 42°6’20”N, 35°15’0”E, 25 m, sand with shell fragments, 99 specimens ; ESFM-POL/2017-184 , 30 July 2017, station TRK32, 42°0’57.24”N, 35° 9’28.51”E, 72 m, mud with phytodetritic material, 6 specimens ; ESFM-POL/2017-185 , 30 July 2017, TRK35, 41°33’40”N, 36°34’19”E, 51 m, mud with shell fragments, 32 specimens ; ESFM-POL/2017-186 , 30 July 2017, station TRK34Y, 41°19’40”N, 36°32’10”E, 20 m, mud with phytodetritic material, 60 specimens ; ESFM- POL/2017-187, 31 July 2017, station TRK37, 41°32’60”N, 36°40’40”E, 8 m, shell fragments with phytodetritic material, 33 specimens; ESFM-POL/2017-188 , 31 July 2017, station TRK44, 41°4’2”N, 38°2’49”E, 48 m, shell fragments with phytodetritic material, 1 specimen ; ESFM-POL/2017-189 , 01 August 2017, station TRK46, 41°0’54”N, 38°27’20”E, 28 m, shell fragments with phytodetritic material, 61 specimens ; ESFM-POL/2017-190 , 02 August 2017, station TRK55, 41°3’60”N, 40°38’24”E, 17 m, mud with shell fragments, 113 specimens ; ESFM- POL/2017-203, 14 August 2017, station BK1, 40°22’12.72”N, 27°57’42.48”E, 33 m, mud with shell fragments, 3 specimens; ESFM-POL/2018-127 , 20 July 2018, station TRK1, 41°55’34”N, 28°12’27”E, 20 m, sand with shell fragments, 12 specimens ; ESFM-POL/2018-128 , 21 July 2018, station TRK7, 41°18’40”N, 29°40’10”E, 22 m, fine sand, 51 specimens ; ESFM-POL/2018-129 , 22 July 2018, station TRK10, 41°19’40”N, 30°47’55”E, 21 m, fine sand, 16 specimens ; ESFM-POL/2018-126 , 22 July 2018, station TRKE1 , 41°23’36”N, 31°38’11”E, 14 m, fine sand with shell fragments, 23 specimens ; ESFM-POL/2018-130 , 23 July 2018, station TRK13, 41°37’20”N, 31°51’3”E, 20 m, mud with sand and detritic material, 34 specimens ; ESFM-POL/2018-131 , 24 July 2018, station TRK19, 42°6’47”N, 33°3’35”E, 24 m, mud with shell fragments, 98 specimens ; ESFM-POL/2018-132 , 25 July 2018, station TRK22, 42°2’34”N, 33°49’33”E, 25 m, mud with shell fragments and detritic material, 145 specimens ; ESFM-POL/2018-133 , 26 July 2018, station TRK25, 42°16’60”N, 34°56’14”E, 20 m, sand, 3 specimens ; ESFM- POL/2018-134, 26 July 2018, station TRK28, 42°6’20”N, 35°15’0”E, 22 m, coarse sand with shell fragments, 42 specimens; ESFM-POL/2018-135 , 27 July 2018, station TRK32, 42°0’57.24”N, 35°9’28.51”E, 24 m, mud with phytodetritic material, 50 specimens ; ESFM-POL/2018-136 , 28 July 2018, station TRK34Y, 41°19’40”N, 36°32’10”E, 48 m, mud, 54 specimens ; ESFM-POL/2018-137 , 28 July 2018, station TRK37, 41°32’60”N, 36°40’40”E, 8.5 m, sand, 4 specimens ; ESFM-POL/2018-138 , 29 July 2018, station TRK43, 41°2’43”N, 38°3’20”E, 48 m, mude with phytodetritic material, 33 specimens ; ESFM-POL/2018-139 , 29 July 2018, station TRK44, 41°4’2”N, 38°2’49”E, 11.6 m, sand, 33 specimens ; ESFM-POL/2018-140 , 29 July 2018, station TRK46, 41°0’54”N, 38°27’20”E, 20 m, mud with phytodetritic material, 189 specimens ; ESFM-POL/2018-141 , 31 July 2018, station TRK55, 41°3’60”N, 40°38’24”E, 25 m, sand, 10 specimens ; ESFM-POL/2018-142 , 01August 2018, station TRK61, 41°46’0”N, 41°31’0”E, 45 m, mud with phytodetritic material, 5 specimens ; ESFM-POL/2019-31 , 04 July 2019, station TRK1, 41°55’34”N, 28°12’27”E, 20 m, sand with shell fragments, 61 specimens ; ESFM-POL/2019-32 , 05 July 2019, station TRK7, 41°18’40”N, 29°40’10”E, 22 m, mud, 12 specimens ; ESFM-POL/2019-33 , 06 July 2019, station TRK10, 41°19’40”N, 30°47’55”E, 21 m, mud, 30 specimens ; ESFM-POL/2019-34 , 07 July 2019, station TRKE1 , 41°23’36”N, 31°38’11”E, 14 m, fine sand with shell fragments, 16 specimens ; ESFM-POL/2019-35 , 07 July 2019, station TRK13, 41°37’20”N, 31°51’3”E, 20 m, sand with detritic material, 30 species ; ESFM-POL/2019- 36 , 08 July 2019, station TRK19, 42° 6’47”N, 33°3’35”E, 24 m, mud with shell fragments, 67 species ; ESFM- POL/2019-56, 09 July 2019, station TRK22, 42°2’34”N, 33°49’33”E, 25 m, mud with shell fragments and detritic material, 79 specimens; ESFM-POL/2019-37 , 09 July 2019, station TRK25, 42°16’60”N, 34°56’14”E, 20 m, mud, 20 specimens ; ESFM-POL/2019-38 , 10 July 2019, station TRK28, 42°6’20”N, 35°15’0”E, 22 m, coarse sand with shell fragments, 235 specimens ; ESFM-POL/2019-39 , 10 July 2019, station TRK32, 42°0’57.24”N, 35°9’28.51”E, 24 m, mud, 64 specimens ; ESFM-POL/2019-40 , 12 July 2019, station TRK34Y, 41°33’40”N, 36°34’19”E, 20 m, mud with phytodetritic material, 31 specimens ; ESFM-POL/2019-41 , 13 July 2019, station TRK37, 41°32’60”N, 36°40’40”E, 8.5 m, mud, 23 specimens ; ESFM-POL/2019-42 , 14 July 2019, station TRK43, 41°0’14.47”N, 37°53’36.96”E, 11.6 m, sand with shell fragments, 45 specimens ; ESFM-POL/2019-43 , 14 July 2019, station TRK44, 41°2’43”N, 38°3’20”E, 48 m, clay with phytodetritic material, 60 species ; ESFM-POL/2019-44 , 16 July 2019, station TRK55, 41°3’60”N, 40°38’24”E, 25 m, mud with shell fragments, 25 specimens ; ESFM-POL/2019- 45 , 16 July 2019, station TRK61, 41°46’0”N, 41°31’0”E, 45 m, mud, 2 specimens .

Description. Largest specimen complete with 37 chaetigers, 5.8 mm long and 0.5 mm wide. Prostomium subrectangular when pharynx not everted, becoming subpentagonal when pharynx everted.Anterior margin convex, posterior margin “U” shaped. Antennae (0.06 mm) and palps (0.05 mm) long, digitiform with swollen tips ( Fig. 5A ). Palps inserted at ventro-lateral margin of prostomium. Two pairs of coalesced eyespots present between chaetiger 2 and 3. Nuchal organs conspicuous, rounded. Pharynx everted with 18 bifid terminal papillae separated with a dorsal and ventral simple papilla; subdistal region with 20 rows of 9–10 subterminal papillae (first 4–5 papillae long and conical, decrease in size towards base of pharynx), extending over 2/3 length of pharynx ( Fig. 5A ), proximal part of pharynx smooth. Middorsal and midventral papillae absent. Jaws light brown, triangular shaped with unequal branches, situated on anterio-lateral margin of pharynx, visible through body wall, without dissection ( Fig. 5B ). Parapodia of first chaetiger slightly smaller than subsequent ones, directed anteriorly, parallel to prostomium. Dorsal cirri very small, ventral cirri (0.02 mm) digitiform with swollen tips and smaller than antennae and palps. Parapodial pre- and postchaetal lamellae rudimentary along the body ( Fig. 2D ). Interramal space smooth, without ciliated patches. Dorsal cirri well developed from chaetiger 2, spherical on first 13–20 anterior chaetigers, becoming pear-shaped (with bulbous base and tapered to tip) towards to the posterior end ( Fig. 5C ). Ventral cirri subsphaerical in whole body after first chaetiger. Acicular lobes conical in anterior region, almost acutely pointed on middle and posterior chaetigers.

Five types of chaetae present in parapodia; capillary chaetae, dentate chaetae, barred chaetae, spinulated chaetae and lyrate chaetae. Dentate chaetae present only in notopodia of chaetiger 1, numbering 3–4 (100 µm) ( Fig. 5E ). Capillary chaetae present only on neuropodia of chaetiger 1, numbering 6-7. Barred chaetae (130 µm) placed on preacicular area of noto- and neuropodia, first appearing on chaetiger 2, present in all remaining parapodia, numbering 3–7 ( Fig. 5G ). Finely spinulated chaetae (250 µm) placed on postacicular area of noto- and neuropodia, first appearing on chaetiger 2, present in all remaining parapodia ( Fig. 5H ). Lyrate chaeta with unequal branches placed on postacicular area of noto- and neuropodia, first appearing on chaetiger 3, present in all remaining parapodia, except for the 3–4 chaetiger, numbering one in each ramus ( Fig. 5F ).

Acicula light brown with a straight tip in anterior and middle parapodia, having curved tip in posterior parapodia, numbering one in per ramus.

Pygidium rounded with one digitiform anal cirrus placed dorsally, as long as last 2–3 chaetigers.

Remarks. The Sea of Marmara and the Black Sea specimens of Micronephthys longicornis matches the original description and redescriptions.

Distribution. Adriatic Sea ( Augener 1932), Mediterranean Sea ( Banse 1959; San Martin 1982; Laborda 2004; Ravara et al. 2010), Black Sea ( Perejaslavtseva 1891; Kurt-Şahin & Çinar 2012; Çinar et al. 2014; Kuş & Kurt- Şahin 2016; Kurt-Şahin et al. 2017a, b; Dnestrovskaya & Jirkov 2019).

Habitat. It was found in muddy and sandy bottom, up to 72 m depth in the present study. It was found in soft substratum at shallower depths (3.6– 7 m) in the Mediterranean Sea ( San Martin 1982; Laborda 2004), and up to 47.4 m in the Black Sea ( Kurt-Şahin et al. 2017a, b; Dnestrovskaya & Jirkov 2019). It was also reported in beds of the brown alga Cystoseira crinita Duby, 1830 from the Sinop Peninsula ( Kuş & Kurt-Şahin, 2016).

Figures

FIGURE 1. Sampling stations in the Sea of Marmara (a) and the Black Sea (b).

FIGURE 2. Inermonephtys turcica n. sp., Holotype, ESFM-POL/2000-910.A, Prostomium, dorsal view; B, Palps, ventral view; C, Jaw, lateral view; D. Lyrate chaeta; E, Barred chaeta; F, Spinulated chaeta; G, Parapodium of chaetiger 10, anterior view; H, Parapodium of chaetiger 20, anterior view; I, Parapodium of chaetiger 40, anterior view; J, Parapodium of chaetiger 102, anterior view. Abbreviations: acL, acicular lobe; bp, basal papilla; br, branchia; dc, dorsal cirri; nepsl, neuropodial postchaetal lamella; neupl, neuropodial prechaetal lamella; no, nuchal organ; nopl, notopodial prechaetal lamella; nopsl, notopodial postchaetal lamella; pl, palp; pros, prostomium; vc, ventral ciri. Scale bar: A, B, 1 mm; C, 0.3 mm; D, E, 30 µm; F, 10 µm; G–J, 1 mm.

FIGURE 3. Inermonephtys turcica n. sp., Holotype, ESFM-POL/2000-910.A, Entire body, lateral view; B, Prostomium, dorsal view; C, Palps, ventral view; D, Postacicular spinulated chaetae; E, Postacicular lyrate chaeta; F, Preacicular barred chaetae. Scale bars: A, 3 mm; B, 1 mm; C, 0.09 mm; D, 5 µm; E, F, 10 µm.

FIGURE 4. Inermonephtys turcica n. sp., Holotype, ESFM-POL/2000-910, general view of parapodia; A1, Parapodium of chaetiger 10, anterior view; A2, Parapodium of chaetiger 10, posterior view; B1, Parapodium of chaetiger 20, anterior view; B2. Parapodium of chaetiger 20, posterior view; C1, Parapodium of chaetiger 40, anterior view; C2, Parapodium of chaetiger 40, posterior view; D1, Parapodium of chaetiger 102, anterior view; D2, Parapodium of chaetiger 102, posterior view. Scale bar: 1 mm.

FIGURE 5. Micronephthys longicornis (ESFM-POL/2019-41). A, Anterior end, with pharynx everted, dorsal view; B, Jaw; C, Shape of dorsal cirri from anterior to posterior (left to right); D, General view of parapodia (chaetiger 30), anterior view; E, Dentate chaeta of chaetiger 1; F, Lyrate chaeta; G, Barred chaeta; H, Spinulated chaeta. Scale bars: A, D, 0.1 mm; B, 0,1 mm; C, 0.01 mm; E, 40 µm; F, 10 µm; G, 25 µm; H, 35 µm.

FIGURE 6. Nephtys hombergii (ESFM-POL/2014-636). A, Anterior end, with pharynx everted, dorsal view; B, Parapodium of chaetiger 10, anterior view; C, Parapodium of chaetiger 20, anterior view; D, Parapodium of chaetiger 40, anterior view; E, Parapodium of chaetiger 80, anterior view; F, Jaw; G, Barred chaeta; H, Spinulated chaeta. Scale bars:A, 0.5 mm; B–E, 0.5 mm; F, 0.8 mm; G, 60 µm; H, 85 µm.

FIGURE 9. Nephtys sinopensis n. sp., Holotype, ESFM-POL/2016-243. A, Anterior end with pharnyx everted, anterior view; B, Jaw; C, Geniculate chaeta; D, Spinose chaeta, with details of spines; E, Barred chaetae; F, Parapodium of chaetiger 10, anterior view; G, Parapodium of chaetiger 20, anterior view; H, Parapodium of chaetiger 35, anterior view; I, Parapodium of chaetiger 52, anterior view. Abbreviations: nopl, notopodial prechaetal lamella; neupl, neuropodial prechaetal lamella. Scale bars: A, 0.2 mm; B, 0.2 mm; C, 45 µm; D, 100 µm; E, 25 µm; F–I, 0.08 mm.

FIGURE 10. Nephtys sinopensis n. sp., Paratype, ESFM-POL/2016-244. A, Prostomium, dorsal view; B. Anterior end with pharynx everted, dorsal view; C, Pharynx, distal view; D. Parapodium of chaetiger 10, anterior view.Abbreviations:an, antennae; br, branchia; mdp, middorsal papilla; neupl, neuropodial prechaetal lamella; no, nuchal organs; nopl, notopodial prechaetal lamella; pl, palps; vc1, ventral cirri of chaetiger 1. Scale bars: A, 0.1 mm; B, 0.5 mm; C, 0.3 mm; D, 0.2 mm.

FIGURE 11. Middle (A–B) and posterior (C–D) parapodia of Nephtys sinopensis n. sp., Paratype, ESFM-POL/2016-244. A, chaetiger 31, anterior view; B, chaetiger 35, posterior view. C, chaetiger 44, anterior view; D, chaetiger 53, lateral view. Abbreviations: bc, branchia; cp, ciliated patches of interramal space; dc, dorsal cirri; neupl, neuropodial prechaetal lamella; nopl, notopodial prechaetal lamella; nopsl, notopodial postchaetal lamella; vc, ventral cirri. Scale bar: A–B, 0.1 mm; C–D, 0.3 mm.