Haplosyllis, Langerhans, 1879

Martínez, María José & Martín, Guillermo San, 2020, Syllidae (Annelida) from East Timor and the Philippines (Pacific Ocean), with the description of three new species of Syllis Savigny in Lamarck, 1818, Zootaxa 4834 (2), pp. 231-263 : 237

Haplosyllis sp.

Figure 2 A–C

Material examined. Philippines. “Sepok Wall”, between Balayan Bay and Batangas Bay , dead coral, 2–3 m depth, Dec 2010, coll. M.T. Aguado, P. Álvarez-Campos, C. Russell, G. San Martín, 1 spec. ( MNCN 16.01 /18730) .

Description. A very small incomplete specimen (12 chaetigers) ( Fig. 2A, C , arrows), with 1-2 simple chaetae per parapodium; chaetae with short spur and two very long, strongly curved teeth, very close to each other, the subdistal with round tip, the distal with pointed tip ( Fig. 2B ).

Remarks. The highly characteristic shape of the chaetae does not fit with any other described species of Haplosyllis . We only have a single, incomplete, minute specimen, and precludes a formal description. There are some other small, similar species in the Pacific, as Haplosyllis crassicirrata Aguado, San Martín & Nishi, 2006 , from Japan; however, that species has thick dorsal cirri, the distal teeth are more acute and more separated ( Aguado et al. 2006). Haplosyllis basticola Sardá, Ávila & Paul, 2002 , from Guam ( Micronesia) has the chaetae with shorter and not so curved teeth ( Sardá et al. 2002). Haplosyllis leylae Cepeda & Lattig, 2017 , from the Red Sea, is also a small species with short dorsal cirri, but the chaetae have longer and larger spurs and the teeth are not as long and curved as in the specimen from the Philippines ( Cepeda et al. 2017).

Habitat. The specimen has the everted pharynx attached to a posterior dorsal cirrus of a specimen of Syllis maganda n. sp.

Distribution. Philippines.

Figures

FIGURE 2. Syllis maganda n. sp. Paratypes (MNCN 16.01/18687). Scanning Electron Micrographs (A, B, D), digital camera (C). A), C) specimen of Haplosyllis sp. (arrows) which is feeding on a posterior dorsal cirrus of Syllis maganda n. sp. B) detail of simple chaeta of Haplosyllis sp. D) regeneration of the prostomium (arrow) of Syllis maganda n. sp., ventral view. No scale bar in digital camera photo.