Prionospio (Prionospio) ehlersi Fauvel 1928
- Dataset
- Species of the subgenera Aquilaspio and Prionospio (Polychaeta: Spionidae: Prionospio) from the southern coast of Turkey (Levantine Sea, eastern Mediterranean), with description of a new species and two new reports for the Mediterranean fauna
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Annelida
- class
- Polychaeta
- order
- Spionida
- family
- Spionidae
- genus
- Prionospio
- species
- Prionospio ehlersi
diagnosis
Diagnosis. Largest specimen incomplete, 0.8 mm wide, 13.6 mm long, with 40 chaetigers. Color in alcohol opaque white. Prostomium anteriorly rounded; laterally somewhat convex; dorsal caruncle extending to chaetiger 2. Two pairs of eyes in trapezoidal arrangement; anterior pair smaller than posterior pair. Branchiae numbering four pairs; first pair longest, with digitiform pinnules; branchiae on chaetigers 3 and 4 apinnate, longer than notopodial lamellae, with dense lateral ciliation and naked tips; branchiae on chaetiger 5 apinnate, longer than those on chaetigers 3 and 4, reaching to chaetiger 7, basally united by a low membrane. Lamellae on chaetiger 1 small, rounded; well developed on following chaetigers. Neuropodial lamella rounded on chaetiger 2, angular, dorsally directed on chaetiger 3; becoming rounded thereafter. Notopodial lamella subtriangular, erected on chaetigers 2 – 5; becoming smaller, rounded thereafter. Low dorsal crests across dorsum, from chaetiger 6 to 24 – 26. Interparapodial pouches from chaetiger 4 to 19 – 20. Ventral sabre chaeta first present on chaetigers 18 – 20, numbering 1 – 2 per fascicle. Multidentate hooded hooks first appearing on neuropodia of chaetigers 19 – 20 and on notopodia of chaetigers 31 – 32.
discussion
Remarks. The Mediterranean specimens agree with the original and subsequent descriptions of the species (Fauvel 1928, Mackie & Hartley 1990, Maciolek 1985, Imajima 1990 a, Blake 1996). However, notopodial hooded hooks first appeared on chaetigers 31 – 32 in the Mediterranean specimens; on chaetigers 37 or later in the Atlantic and Pacific specimens (Maciolek 1985); on chaetigers 44 – 48 in the Japanese specimens (Imajima 1990 a); and on chaetigers 44 – 60 in the North Atlantic specimens (Blake, 1996). Ecology. The maximum population density (260 individuals. m - 2) of this species was found on muddy substratum at 200 m depth at station G 33 (Fethiye Bay).
distribution
Distribution. Atlantic Ocean, Pacific Ocean, Mediterranean Sea, Red Sea (Tebble 1959; Laubier 1965; Amoureux et al. 1978; Blake 1983, 1996; Maciolek 1985; Imajima 1990 a); 5 – 4176 m.
materials_examined
Material examined. ESFM – POL / 05 – 1636, 1 specimen, 27 September 2005, Antalya Bay, D 39, 36 º 48 ΄ 49 ʺN, 30 º 37 ΄ 57 ʺE, 100 m, mud; ESFM – POL / 05 – 1852, 6 specimens, 30 September 2005, Finike Bay, G 18, 36 º 16 ΄ 31 ΄΄ N, 30 º 10 ΄ 50 ΄΄ E, 75 m, mud; ESFM – POL / 05 – 3209, 7 specimens, 30 September 2005, Finike Bay, G 19, 36 º 16 ΄ 0 6 ΄΄ N, 30 º 11 ΄ 31 ΄΄ E, 100 m, mud; ESFM – POL / 05 – 3210, 2 specimens, 6 October 2005, Fethiye Bay, G 30, 36 º 39 ΄ 24 ΄΄ N, 29 º 04 ΄ 44 ΄΄ E, 50 m, sandy mud; ESFM – POL / 05 – 1997, 18 specimens, 6 October 2005, Fethiye Bay, G 31, 36 º 38 ΄ 56 ΄΄ N, 29 º 03 ΄ 38 ΄΄ E, 75 m, muddy sand with gravel; ESFM – POL / 05 – 2600, 26 specimens, 6 October 2005, Fethiye Bay, G 33, 36 º 38 ΄ 28 ΄΄ N, 29 º 02 ΄ 37 ΄΄ E, 200 m, mud; ESFM – POL / 05 – 3211, 2 specimens, 6 October 2005, Fethiye Bay, G 32, 36 º 38 ΄ 42 ΄΄ N, 29 º 03 ΄ 18 ΄΄ E, 100 m, mud.