Levinsenia marmarensis, Çinar & Dagli & Açik, 2011

Çinar, Melih Ertan, Dagli, Ertan & Açik, Sermin, 2011, Annelids (Polychaeta and Oligochaeta) from the Sea of Marmara, with descriptions of five new species, Journal of Natural History 45 (33 - 34), pp. 2105-2143: 2132-2136

publication ID

http://doi.org/ 10.1080/00222933.2011.582966

persistent identifier

http://treatment.plazi.org/id/03A887C7-FFCF-FFE8-FE27-6206FD7A5F70

treatment provided by

Felipe

scientific name

Levinsenia marmarensis
status

sp. nov.

Levinsenia marmarensis   sp. nov.

( Figures 9 View Figure 9 , 10 View Figure 10 )

Material examined

Holotype. ESFM – POL / 2010–51, 15 April 2010, Sea of Marmara , Gelibolu, G 11, 40 ◦ 19 ′ 59 ′′ N, 27 ◦ 01 ′ 59 ′′ E, 54 m, sandy mud. GoogleMaps  

Paratypes. ESFM – POL / 2010–52   , five specimens, 15 April 2010, Sea of Marmara , Gelibolu, G 11, 40 ◦ 19 ′ 59 ′′ N, 27 ◦ 01 ′ 59 ′′ E, 54 m, sandy mud GoogleMaps   ; ESFM – POL / 2010– 53   , two specimens, 15 April 2010, Sea of Marmara , Gelibolu, G 10, 40 ◦ 31 ′ 16 ′′ N, 26 ◦ 58 ′ 46 ′′ E, 48 m, sandy mud GoogleMaps   ; ESFM – POL / 2008–83   , two specimens, 9 August 2008, Sea of Marmara , Erdek, E 1, 40 ◦ 18 ′ 42 ′′ N, 27 ◦ 46 ′ 18 ′′ E, 17 m, sandy mud GoogleMaps   ; ESFM – POL / 2008–77   , 13 specimens, 9 August 2008, Sea of Marmara , Erdek, E 6, 40 ◦ 18 ′ 49 ′′ N, 27 ◦ 46 ′ 04 ′′ E, 27 m, sandy mud GoogleMaps   ; ESFM – POL / 2008–78   , eight specimens, 9 August 2008, Sea of Marmara , Erdek, E 3, 40 ◦ 18 ′ 56 ′′ N, 27 ◦ 46 ′ 18 ′′ E, 28 m, sandy mud GoogleMaps   .

Description

Holotype incomplete, 14.75 mm long, 0.12 mm wide, with 54 chaetigers. Colour in alcohol opaque white. Body slender, wider anteriorly, filiform from midbody, gradually tapering to posterior end. Anterior segments short, much wider than long (ca. two times). Prostomium conical, with truncated anterior margin, longer than wide (length: 148 µm; width: 103 µm); ending in a cylindrical sensory organ, sometimes everted (length: 12.5 µm); a pair of nuchal organs as deep nuchal slits ( Figure 9A View Figure 9 ). Posterior buccal lip with six longitudinal folds, extending to middle part of chaetiger 1 ( Figure 9B View Figure 9 ). Eyes absent.

First five notopodial postchaetal lobes (prebranchial) short, rounded ca. 25 µm long ( Figure 10B View Figure 10 ); in branchial region, from chaetiger 6 to 13, longer, digitiform; ca. 30–47.5 µm long ( Figure 10A View Figure 10 ); in postbranchial region, shorter and thinner than those in branchial and prebranchial regions; ca. 12.5 µm on middle part of body; thinner, fingerlike (ca. 12.5 µm long) on posterior chaetigers ( Figure 10C View Figure 10 ). Neuropodial postchaetal lobes absent ( Figure 10B,C View Figure 10 ). Branchiae always starting from chaetiger 6, eight pairs (seven or eight pairs in paratypes), ca. 238 µm long, 40 µm wide (l / w mostly between 4.8–6); cirriform, with rounded tip, not ciliated ( Figures 9A View Figure 9 , 10A View Figure 10 ). Chaetigers 1–18 with only capillary chaetae. In chaetiger 3, notopodium with 13 capillary chaetae (ca. 178 µm long), neuropodium with nine capillary chaetae (ca. 158 µm long). In chaetiger 18 notopodium with seven or eight capillary chaetae (ca. 175 µm long), neuropodium with eight capillary chaetae (ca. 168 µm long). Modified neurochaetae from chaetiger 19 (19–20 in paratypes) to end of body, up to six per fascicle, arranged in a single row; strongly curved, with expanded shaft, unidentate, with a pubescent sheath on convex side of shaft, but not reaching tip of chaetae ( Figures 9C View Figure 9 , 10C View Figure 10 ); with two or three fine capillary accompanying chaetae. In chaetiger 20, notopodium with six capillary chaetae (ca. 178 µm long), neuropodium with three capillary chaetae (ca. 178 µm long) and one modified chaeta (15 µm long; length from node to tip). In chaetiger 35, notopodium with four capillary chaetae (ca. 181 µm long), neuropodium with two capillary chaetae (ca. 185 µm long) and three modified chaetae (22.5 µm long). In chaetiger 51, notopodium with two capillary chaetae (ca. 188 µm long), neuropodium with two capillary chaetae (ca. 190 µm long) and five modified chaetae (25 µm long). Pygidium missing.

Remarks

Levinsenia marmarensis   sp. nov. is easily distinguished from the other species of the genus in having seven or eight pairs of branchiae starting from chaetiger 6. The other species of Levinsenia   have different numbers of branchiae, but none has seven or eight pairs (see comparative characters of all Levinsenia species   in table 2 by Aguirrezabalaga and Gil 2009).

Levinsenia gracilis minuta (Hartman-Schröder 1965)   and L. oculata ( Hartman 1957)   also have 8–11 pairs of branchiae, which have long and acute tips. However, these two species can be distinguished from L. marmarensis   sp. nov. by the number of branchiae and the morphological features of the modified chaetae. Levinsenia gracilis minuta   , which was originally described from Chile (Gulf of Punta Topocalma) at 150–240 m by Hartman-Schröder (1965), has 8–11 pairs of branchiae starting from chaetiger 6. Levinsenia marmarensis   sp. nov. differs from L. gracilis minuta   in having modified chaetae strongly curved with a pubescent sheath on the convex side of the shaft (slightly curved without a pubescent sheath in L. gracilis minuta   ) and non-ciliated nuchal slits (ciliated nuchal slits in L. gracilis minuta   ). Levinsenia gracilis minuta   was subsequently described from the coast of Japan by Imajima (1973). However, the morphological features of the Japanese specimens are not congruent with the original description. For example, the Japanese specimens have three or five pairs of short branchiae, whereas the types of L. gracilis minuta   have 8–11 pairs of branchiae. Therefore, we think that the Imajima’s specimens might belong to a different species of Levinsenia   .

Levinsenia marmarensis   sp. nov. is also similar to L. oculata   , which was originally described from Southern California at 15 m by Hartman (1957), with regards to the number and shape of branchiae (seven or eight pairs in L. marmarensis   sp. nov., 8–11 pairs in L. oculata   , all branchiae are long and with acute tip). However, L. marmarensis   sp. nov. differs from it in having no pigmentation on prostomium (brownish spots surrounding nuchal organs in L. oculata   ), modified neurochaetae commencing from chaetiger 19 (from chaetigers 15–16 in L. oculata   ) with small hood (without hood in L. oculata   ).

Reproduction

Specimens of Levinsenia marmarensis   sp. nov. collected in April have eggs in the coelomic cavities between chaetigers 30 and 48; egg diameter: 37.5–80 µm (mean: 68 µm; SD: ± 21.45, n = 20).

Etymology

This species name, marmarensis   refers to the type locality (Sea of Marmara).

Distribution

Sea of Marmara, between 17 and 54 m depth.

ESFM

Museum of Faculty of Fisheries, Ege University

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Family

Paraonidae

Genus

Levinsenia

Loc

Levinsenia marmarensis

Çinar, Melih Ertan, Dagli, Ertan & Açik, Sermin 2011
2011
Loc

L. marmarensis

Çinar & Dagli & Açik 2011
2011
Loc

Levinsenia marmarensis

Çinar & Dagli & Açik 2011
2011
Loc

Levinsenia marmarensis

Çinar & Dagli & Açik 2011
2011
Loc

L. marmarensis

Çinar & Dagli & Açik 2011
2011
Loc

L. marmarensis

Çinar & Dagli & Açik 2011
2011