Pisione inkoi Martínez, Aguirrezabalaga & Adarraga, 2008

Martins, Roberto, Martín, Guillermo San, Rodrigues, Ana Maria & Quintino, Victor, 2012, On the diversity of the genus Pisione (Polychaeta, Pisionidae) along the Portuguese continental shelf, with a key to European species, Zootaxa 3450, pp. 12-22 : 16

Pisione inkoi Martínez, Aguirrezabalaga & Adarraga, 2008

Material examined. MB29-000241, 1 specimen, site PC89; MB29-000242, 1 specimen, site PC104 ( Table 1 ). Additional material: 1 specimen, site R46; 2 specimens, site PC89; 2 specimens, site PC90 ( Table 1 ).

Brief description. Width of chaetiger 10 ranging from 0.25 and 0.62 mm, total length from 5.50 to 9.60 mm, with up to 47 chaetigers. Buccal aciculae protruding obliquely, not exceeding length of chaetiger 1, with subrounded distal margin. Prechaetal lobes bilobed in anterior chaetigers and entire on remaining segments. All dorsal cirri globular, small and similar in size ( Table 2 ). Three types of chaetae: three long-bladed compound chaetae (blade length ranging from 39 to 65 µm; cf. Table 2 ), one short-bladed compound falciger and one supraacicular simple chaeta, distally unidentate. One stout protruding notoacicula, up to 0.11 mm. Female genital chaetigers with a simple cirriform process developed ventrally at base of parapodium. Female gametes globular, with a diameter ranging from 40 µm to 89 µm, located in chaetigers 29–42 (MB29-000241). No males were found in our samples. Pygidium with two long anal cirri.

Distribution and habitat. This species occurred in fine gravel (33%), very coarse (33%), and medium sand (33%), with moderate total organic matter content, 2.4% of total sediment dry weight in average and low biogenic content (1.4% in average). Specimens of this species were recorded mainly in the western Portuguese coast, between 74 and 127 m deep (cf. Table 3 ). The present study extends the distribution depth range of P. i n k o i, previously known from 56 to117 m ( Martínez et al. 2008). This species was known for the northern Iberian Peninsula and this study extends its southern limit to the western sector of the Portuguese continental shelf ( Fig. 1 ).

Figures

FIGURE 1. Distribution and relative abundance of Pisione species along the Portuguese continental shelf (northeastern Atlantic).