Prionospio (Prionospio) dubia Day 1961
- 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 dubia
diagnosis
Diagnosis. Largest specimen complete, 0.6 mm wide, 20.9 mm long, with 82 chaetigers. Prostomium rounded anteriorly, with a narrow caruncle reaching to posterior part of chaetiger 1. Eyes absent. Branchiae numbering four pairs; first and fourth pairs with long digitiform pinnules; first pair extending to chaetiger 6 – 7; fourth pair short, reaching to chaetiger 7; second and third branchiae apinnate, similar in size. Noto- and neuropodial lamellae smallest on chaetiger 1; largest on chaetigers 3 – 4. Dorsal crests absent. Ventral sabre chaeta first present on chaetiger 18, numbering 1 – 2 per parapodium. Multidentate hooded hooks first appearing on neuropodia of chaetigers 18 – 20 and notopodia of chaetigers 37 – 48.
discussion
Remarks. The specimens examined in the present study agree with the original and subsequent descriptions of the species (Day 1961; Maciolek 1985; Imajima 1990; Sigvaldadóttir & Mackie 1993). As reported by Maciolek (1985), Imajima (1990 a) and Sigvaldadóttir & Mackie (1993), P. (P) dubia has a high variability in the first occurence of hooded hooks and sabre chaetae. Ecology. The maximum population density (30 individuals. m - 2) of this species was encountered on muddy substratum at 100 m depth at station G 19 (Finike Bay).
distribution
Distribution. Western and Eastern North Atlantic, Pacific Ocean, Indian Ocean and Mediterranean Sea (Blake 1996; Imajima 1990 a; Çinar & Ergen 1999); 17 – 2379 m.
materials_examined
Material examined. ESFM – POL / 05 – 1856, 1 specimen, 30 September 2005, Finike Bay, G 18, 36 º 16 ΄ 31 ΄΄ N, 30 º 10 ΄ 50 ΄΄ E, 75 m, mud; ESFM – POL / 05 – 2030, 3 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 – 1882, 2 specimens, 6 October 2005, Fethiye Bay, G 32, 36 º 38 ΄ 42 ΄΄ N, 29 º 03 ΄ 18 ΄΄ E, 100 m, mud; ESFM – POL / 05 – 1945, 1 specimen, 6 October 2005, Fethiye Bay, G 30, 36 º 39 ΄ 24 ΄΄ N, 29 º 04 ΄ 44 ΄΄ E, 50 m, sandy mud.