Prionospio (Minuspio) maciolekae , Dagli, Ertan & Çinar, Melih Ertan, 2011

Dagli, Ertan & Çinar, Melih Ertan, 2011, Species of the subgenus Minuspio (Polychaeta: Spionidae: Prionospio) from the southern coast of Turkey (Levantine Sea, eastern Mediterranean), with the description of two new species, Zootaxa 3043, pp. 35-53: 42-46

publication ID

10.5281/zenodo.206763

persistent identifier

http://treatment.plazi.org/id/03897F61-C91F-FFB8-6AEF-FC2A12DFFD37

treatment provided by

Plazi

scientific name

Prionospio (Minuspio) maciolekae
status

sp. nov.

Prionospio (Minuspio) maciolekae  sp. nov.

( Figs 6–8View FIGURE 6View FIGURE 7View FIGURE 8, 13View FIGURE 13. A C)

Material examined. Holotype. ESFMAbout ESFM –POL/ 2005 – 1957, 6 October 2005, Fethiye Bay, G 29, 36 º 39 ʹ 29 ʹ N– 29 º06ʹ0 2 ʹ E, 25 m, sandy mud [salinity: 38.5 psu, temperature: 24 °C, dissolved oxygen concentration: 5.58 mg/l]. Paratypes. ESFMAbout ESFM –POL/ 2005 – 40, 1 specimen, 10 September 2005, Iskenderun Bay, D 15, 36 º 31 ʹ 56 ʹ N– 35 º 35 ʹ 16 ʹ E, 50 m, mud; ESFMAbout ESFM –POL/ 2005 – 177, 1 specimen, 10 September 2005, Iskenderun Bay, D 21, 36 º 20 ʹ 43 ʹ N– 35 º 48 ʹ0 8 ʹ E, 25 m, muddy sand; ESFMAbout ESFM –POL/ 2005 – 825, 1 specimen, 17 September 2005, Mersin Bay, D 23, 36 º 40 ʹ 50 ʹ N– 34 º 35 ʹ 12 ʹ E, 50 m, mud; ESFMAbout ESFM –POL/ 2005 – 1405, 1 specimen, 17 September 2005, Mersin Bay, G 11, 36 º 45 ʹ 47 ʹ N– 34 º 51 ʹ 54 ʹ E, 5 m, mud; ESFMAbout ESFM –POL/ 2005 – 1767, 1 specimen, 30 September 2005, Finike Bay, G 15, 36 º 17 ʹ 34 ʹ N– 30 º09ʹ 33 ʹ E, 10 m, Zostera marina  ; ESFMAbout ESFM –POL/ 2005 – 1957, 1 specimen, 6 October 2005, Fethiye Bay, G 29, 36 º 39 ʹ 29 ʹ N– 29 º06ʹ0 2 ʹ E, 25 m, sandy mud; ESFMAbout ESFM –POL/ 2005–2051, 7 specimens, 30 September 2005, Finike Bay, G 17, 36 º 16 ʹ 48 ʹ N– 30 º 10 ʹ 20 ʹ E, 50 m, mud; ESFMAbout ESFM –POL/ 2005–3249, 2 specimens, 6 October 2005, Fethiye Bay, G 29, 36 º 39 ʹ 29 ʹ N– 29 º06ʹ0 2 ʹ E, 25 m, sandy mud; ESFMAbout ESFM –POL/ 2005–3250, 1 specimen, 10 September 2005, Iskenderun Bay, D 19, 36 º 21 ʹ 16 ʹ N– 35 º 44 ʹ 27 ʹ E, 75 m, muddy sand with gravel; ESFMAbout ESFM –POL/ 2005–3251, 2 specimens, 12 September 2005, Iskenderun Bay, K 5, 36 º08ʹ 30 ʹ N– 35 º 54 ʹ 30 ʹ E, 1 m, mud; ESFMAbout ESFM –POL/ 2005–3252, 3 specimens, 6 October 2005, Fethiye Bay, G 28, 36 º 37 ʹ 48 ʹ N– 29 º06ʹ 30 ʹ E, 10 m, mud. Additional material examined. ESFMAbout ESFM –POL/ 2000 – 236, 3 specimens, 4 August 2000, Saroz Bay, Sta. A 3, anchor dredge, 40 º 34 ʹ 45 ʹ N– 26 º09ʹ 25 ʹ E, 1 m, Posidonia oceanica  ; ESFMAbout ESFM –POL/ 2000 – 250, 3 specimens, 17 August 2000, Bozcaada, Sta. B 10, anchor dredge, 39 º 34 ʹ 55 ʹ N– 26 º05ʹ 13 ʹ E, 41 m, mud; ESFMAbout ESFM –POL/ 2000 – 278, 1 specimen, 30 September 2000, Kuşadası, Sta. E 8, anchor dredge, 37 º 59 ʹ0 0ʹ N– 27 º 11 ʹ 15 ʹ E, 32 m, muddy sand; ESFMAbout ESFM –POL/ 2003 – 251, 1 specimen, 9 July 2003, Çeşme, Sta. 2, 38 º 23 ʹ 25 ʹ N– 26 º 27 ʹ 11 ʹ E, 45 m, mud; ESFMAbout ESFM – POL/ 2005–2135, 5 specimens, 8 October 2005, Kuşadası, G 39, 37 º 50 ʹ 25 ʹ N– 27 º 12 ʹ0 4 ʹ E, 5 m, mudy sand; ESFMAbout ESFM – POL/ 2005–2579, 1 specimen, 9 October 2005, Kalamaki, K 55, 37 º 42 ʹ 32 ʹ N– 27 º 12 ʹ 21 ʹ E, 1 m, Posidonia oceanica  .

Description. Holotype complete, 0.29 mm wide, 9.74 mm long, with 67 chaetigers. Body slender, enlarged anteriorly, gradually tapering to posterior end, color in alcohol opaque, white to pale yellow. Prostomium subrectangular, broadly rounded anteriorly, extending posteriorly as a blunt caruncle reaching to base of chaetiger 1; posterior part of prostomium surrounded by nuchal organs ( Fig. 6View FIGURE 6 A). Anterior part of prostomium without peaks ( Fig. 6View FIGURE 6 A). Two pairs of small spherical eyes; anterior pair larger than posterior pair ( Fig. 6View FIGURE 6 A–B). Peristomium partly fused with chaetiger 1, forming moderate lateral wings ( Fig. 6View FIGURE 6 A–B). Palps missing in holotypes, short (ca. 232 µm), extending over two chaetigers in paratypes.

Branchiae apinnate, present from chaetigers 2 to 10, numbering 9 pairs (8–10 pairs in paratypes); densely ciliated ( Figs 7View FIGURE 7 A–C); cilia emerging along both sides of ventral groove ( Fig. 7View FIGURE 7 A–C). First pair longest, ca. 350 µm long, up to 1.3–1.5 times longer than other pairs; last pair shortest and narrowest, ca. 230 µm long ( Fig. 6View FIGURE 6 A–B); other pairs almost equal in length ( Figs 6View FIGURE 6 A–B; 13 C). All branchiae almost 1.3–2.5 times longer than length of notopodial lamellae.

Notopodial lamellae lacking on chaetiger 1; notopodial lamellae short, triangular on chaetiger 2; largest on chaetiger 4, subtriangular ( Fig. 6View FIGURE 6 B); similar in size and shape between chaetigers 5 and 8; becoming shorter, broader and more triangular on chaetigers 9–10 (last pairs of branchiae) ( Figs 6View FIGURE 6 A–B, 7 A–C). Notopodial lamellae united across dorsum on chaetigers 11 to 28 (10–25 in paratypes) ( Figs 6View FIGURE 6 A, 8 A), forming low distinct crests; becoming evenly rounded. On remaining chaetigers, notopodial lamellae large, rounded; becoming finger–like on posterior chaetigers ( Figs 7View FIGURE 7 D, 8 B–C).

Neuropodial lamellae small, fingerlike on chaetiger 1; becoming rectangular on chaetiger 2, not ventrally pointed; largest in branchial region; gradually decreasing in size on following chaetigers; becoming fingerlike on posterior chaetigers ( Figs 6View FIGURE 6 A–B, 7 A–C, 8 A–C). On all chaetigers, neuropodial lamellae smaller than notopodial lamellae. Genital pouches absent.

Anterior noto– and neuropodial lobes with only capillary chaetae, arranged in two rows in anterior chaetigers, with thin sheath; all capillaries moderately granulated ( Fig. 8View FIGURE 8 F). Ventral sabre chaetae from chaetiger 13 (14 on paratypes) to end of body; numbering one or two per fascicle; stout, curved, granulated, with a short distal filament ( Fig. 8View FIGURE 8 E). Neuropodial hooded hooks first emerging from chaetiger 14 (15 on paratypes), numbering up to 7–8 per fascicle; three pairs of small, thin teeth above main fang ( Fig. 8View FIGURE 8 D). Notopodial multidentate hooded hooks first present from chaetiger 33 (30–34 on paratypes); numbering up to 4–5 per fascicle. Hooks with obvious secondary hoods accompained by capillaries throughout.

Pygidium with one long dorso–medial cirri and two short ventro–lateral lobes, without pigmentations at tips ( Fig. 7View FIGURE 7 D).

Remarks. Prionospio (Minuspio) maciolekae  sp. nov., is mainly characterized by short, thin and densely ciliated apinnate branchiae on chaetigers 2–10 (11). The same branchial morphology was reported in the following species; Prionospio (Minuspio) multibranchiata Berkeley, 1927  from the Pacific coast of Canada (Vancouver Island), Prionospio (Minuspio) cirrifera Wirén, 1883  from the Arctic Ocean (Kara Sea), and P. (M.) lighti Maciolek, 1985  from the coast of California.

Prionospio (M.) maciolekae  sp. nov., is closely related to P. (M.) multibranchiata  , which was first described from the Pacific coast of Canada (Vancouver Island) by Berkeley (1927), and subsequently reported from the western Atlantic and eastern Pacific (Florida, Gulf of Mexico and Washington) by Maciolek (1985), the eastern Atlantic ( United Kingdom, Norway, Sweden, France) and Mediterranean Sea (Venice, Adriatic) by Mackie (1984), and the western Pacific ( Japan) by Imajima (1990). We examined two specimens of P. (M.) multibranchiata  collected from Bazan Bay (Pacific coast of Canada) at 10 m depth, a place very close to the type locality. The morphology of these specimens coincided with the original description of the species. We observed some important differences between these specimens and those of P. (M.) maciolekae  sp. nov. These differences include (1) eyes (four large crescent– shaped eyes in the Canadian specimens vs. four (some specimens have six) small, spherical eyes in our specimens; (2) peaks on prostomium (five small peaks on the anterior part of the prostomium in the Canadian specimens vs.

absent in our specimens; (3) first neuropodial lamellae (rounded in the Canadian specimens vs. fingerlike in our specimens), (4) second neuropodial lamellae (subtriangular in the Canadian specimens vs. rectangular in our specimens); (5) first pair of branchiae (smaller than subsequent pairs in the Canadian specimens vs. longer than subsequent pairs in our specimens); (6) cilia on branchiae (absent in the Canadian specimens vs. dense in our specimens); (7) dorsal crests [indistinct, between chaetigers 13 and 20 in the Canadian specimens ( Berkeley (1927) did not mention this character) vs. distinct, between chaetigers 11 and 28 in our specimens], (8) notopodial hooded hooks (first present on chaetiger 44 in the Canadian specimens vs. chaetiger 30–34 in our specimens); (9) the morphology of hooks (teeth above above fang coarse and small in the Canadian specimens vs. thin and long in our specimens); (10) sabre chaetae (first appear on chaetiger 11, without distal filament in the Canadian specimens vs. first appear on chaetigers 13 or 14, with a distinct distal filament).

Prionospio (M.) maciolekae  sp. nov., is similar to P. (M.) cirrifera  , which was first described from the Kara Sea (Arctic Ocean) by Wirén (1883) and subsequently from Arctic and north Atlantic Ocean by Maciolek (1985) and Mackie (1984). However, P. (M.) maciolekae  sp. nov., differs from it in a number of characters which include (1) shape of the prostomium (subrectangular, broadly rounded anteriorly, extending posteriorly as a blunt caruncle reaching to base of chaetiger 1 in P. m a c i o l e k a e sp. nov., vs. bluntly triangular, truncate anteriorly, extending posteriorly as a narrow caruncle reaching to posterior margin of chaetiger 2 in P. (M.) cirrifera  ), (2) the number of branchiae [9–10 pairs in P. (M.) maciolekae  sp. nov., vs. 6–8 pairs in Prionospio (M.) cirrifera  ], (3) first occurrence of sabre chaeta [chaetigers 13–14 in P. (M.) maciolekae  sp. nov., vs. chaetiger 10 in P. (M.) cirrifera  ]; (4) the morphology of hooded hooks [three pairs of small teeth above main fang in P. (M.) maciolekae  sp. nov., vs. five or six pairs of small teeth above main fang in P. (M.) cirrifera  ].

Prionospio (M.) maciolekae  sp. nov., is also smilar to P. (M.) lighti  , which was originally described from the coast of California by Maciolek (1985). However they differ from each other in a number of characters; (1) prostomium (broadly rounded in P. (M.) maciolekae  sp. nov., vs. bluntly rounded in P. (M.) lighti  ], (2) peaks on prostomium (absent in P. (M.) maciolekae  sp. nov., vs. three large peaks in P. (M.) lighti  ); (3) neuropodial lamellae on chaetiger 2 (rectangular in P. (M.) maciolekae  sp. nov., vs. rounded in P. (M.) lighti  ], (4) dorsal crests (present in P. (M.) maciolekae  sp. nov. vs. absent in P. (M.) lighti  ], (5) sabre chaetae (with distal filament in P. (M.) maciolekae  sp. nov., vs. without distal filament in P. (M.) lighti  ).

Ecology. The highest population density (70 individuals m– 2) of this species was found on a muddy substratum in 50 m depth at station G 17 (Finike Bay).

Distribution. This species was found in the eastern Mediterranea Sea. The re–examination of specimens collected along the Turkish coasts and identified as P. (M.) multibranchiata  revealed that all specimens belong to P. (M.) maciolekae  sp. nov. Therefore, the presence of P. (M.) multibranchiata  in the Mediterranean Sea seems to be questionable and specimens from different basins of the Mediterranean requires a re–examination.

Etymology. This species is named for Dr. Nancy J. Maciolek ( ENSR Marine and Coastal Center, Woods Hole, USA), who has made excellent contributions to the taxonomy of Spionidae  .

ESFM

Museum of Faculty of Fisheries, Ege University

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Spionida

Family

Spionidae

Genus

Prionospio