Pterocirrus Claparede 1868
- Dataset
- New species of hesionid and phyllodocid polychaetes (Annelida, Errantia) from Clipperton Island
- Rank
- GENUS
Classification
- kingdom
- Animalia
- phylum
- Annelida
- class
- Polychaeta
- order
- Phyllodocida
- family
- Phyllodocidae
- genus
- Pterocirrus
diagnosis
DIAGNOSIS (modified after Pleijel 1991). — Phyllodocids with prostomium oval to cordate with two lateral antennae, median antenna well developed; eyes usually large, well developed. Nuchal organs not projected posteriorly. Four pairs of tentacular cirri; dorsal cirri cylindrical to medially widened, ventral cirri similar except in segment 2, being larger, foliose. Median segments with dorsal cirri lanceolate to cordate. Supracicular lobes blunt to tapered, sometimes more projected than subacicular lobes. Neurochaetal shafts with scarce distal denticles. Anal cirri tapered. Pharyngeal surface with abundant filiform papillae, rarely globose.
discussion
REMARKS Pterocirrus Claparède, 1868 was proposed as a subgenus in Eulalia Savigny, 1822, and it was regarded as an independent genus by Michaelsen (1892: 103), de Saint-Joseph (1895: 226), and Ehlers (1904: 17). However, Bergström (1914: 99) regarded it as a junior synonym of Sige Malmgren, 1865. His conclusion was surprising because of three facts. First, Sige lacks winged ventral cirri in segment 2, which were used for naming the subgenus as Pterocirrus. Second, Sige has digitate, markedly projected supracicular lobes, which are not so projected in Pterocirrus. Third, in Sige the pharynx appears smooth, but in Pterocirrus it was characterized as having abundant large, blunt papillae by McIntosh (1908: 62). As part of his monograph on Northwestern Pacific polychaetes, Uschakov (1972: 151) included a key to phyllodocid genera, reinstated Pterocirrus as an independent genus, and provided a diagnosis and a key for identifying its species. Uschakov’s proposal was followed by Banse (1973), Banse & Hobson (1974), and Fauchald (1977). Pleijel (1991) analysed the phylogeny and proposed a new classification for the Phyllodocidae, including revised diagnosis for all genera. On the other hand, Pterocirrus resembles Eulalia Savigny, 1822 because in both genera, ventral cirri of segment 2 are wider than the others, although in Eulalia they are not so markedly expanded as in Pterocirrus, and in Eulalia the pharynx has globular papillae, but they are thinner, filiform in Pterocirrus. Further, in Eulalia acicular lobes are blunt, of similar size, whereas in Pterocirrus the supracicular lobe is often more projected than the subacicular one.
distribution
DISTRIBUTION. — The species of Pterocirrus have been described mostly from shallow-water localities from tropical, temperate and polar seas.
type_taxon
TYPE SPECIES. — Eulalia (Pterocirrus) velifera Claparède, 1868 by subsequent designation (Bergström 1914: 98); junior synonym of Phyllodoce (Eulalia) macroceros Grube, 1860 after Grube (1880: 211).
Name
- Homonyms
- Pterocirrus Claparede 1868