Amblyosyllis granosa Ehlers 1897
Creators: name: Fukuda, Marcelo V.
name: Nogueira, João M. M.
name: Martín, Guillermo San
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Phyllodocida
Syllidae
Amblyosyllis
Amblyosyllis granosa

description: Amblyosyllis granosa Ehlers, 1897
Figures 1–2
Amblyosyllis granosa Ehlers, 1897: 58; Westheide 1974: 260 –263, figs 30–31; non Verdes et al. 2013: 2120, figs 7–8.
Material examined. Project 'BioPol'. Ubatuba—Praia do Félix (23°23'34"S 44°58'19"W): 1 spec. (MZUSP 2384), 4 Nov 2002. São Sebastião—Praia de São Francisco (23°44'54"S 45°24'33"W): 1 spec., 19 Apr 2003; Praia do Araçá (23°48'54"S 45°24'24"W): 2 specs, 25 Sep 2003.
Additional material examined. Amblyosyllis granosa. Atlantic Ocean, Strait of Magellan, Punta Arenas: 1 spec. (type, ZMH V- 4751), coll. H. Mag. Samm., 73, det. Ehlers, 1897.
Pterosyllis formosa corallicola Hartmann-Schröder, 1960. Red Sea, Egypt, Sarso: 1 spec. (holotype, ZMH P- 14566), coll. Gerlach, 13 Nov 1957; Ghardaqa: 1 anterior end + posterior ends (paratypes, ZMH P-14567), coll. Gerlach, Remane, Schulz, 15 Nov 1957.
Description. Small-sized body, largest specimen examined ~ 5 mm long, 0.8 mm wide, with 13 chaetigers. Palps ovate, completely free from each other. Prostomium ovate with 2 coalescent pairs of eyes in trapezoidal arrangement (Fig. 1 A–B); lateral antennae inserted on anterior margin of prostomium, with up to 15 articles each; median antenna inserted slightly posterior to lateral ones, ~1/3 longer, with up to 21 subequal articles, basally smooth, with large cirrophore (Fig. 1 A–B); nuchal epaulettes relatively short, extending until close to posterior border of chaetiger 1 (Fig. 1 B). Peristomium dorsally short; dorsal peristomial cirri longer than median antenna, with up to 38 articles each, ventral peristomial cirri slightly shorter than lateral antennae, with ~10 articles each (Fig. 1 A). Dorsal cirri throughout of nearly even length, with 20–30 articles each, distal articles tapering; ventral cirri ovate, prominent, extending beyond parapodial lobes (Fig. 1 A). Antennae and cirri throughout with yellow to reddish granular inclusions (Fig. 1 A). Parapodial lobes distally bilobed. Anterior parapodia with 16–23 falcigers each; posterior parapodia with 25–35 falcigers each. Falciger shafts slightly spinulated subdistally, shafts progressivelly stouter towards posterior body (Fig. 2 A–B); falciger blades spinulated, with short straight spines, and bidentate, distal tooth larger; blades with dorso-ventral gradation in length, 42–22 Μm long on anterior body, 36–22 Μm long on posterior body (Fig. 2 A–B). Dorsal and ventral simple chaetae not observed. Anterior parapodia with up to 5 aciculae each (Fig. 2 C), progressively less aciculae per parapodium towards posterior body, last ones with only 2 aciculae each (Fig. 2 D); aciculae differing from each other only in thickness, all straight, distally pointed, tips protruding from parapodial lobes (Fig. 2 C–D). Pygidium rounded, anal cirri similar to dorsal cirri, incomplete in all specimens examined. Pharynx long, slender, with sinuation anterior to proventricle (Fig. 1 C); trepan with 6 tricuspidate teeth inserted in lobate base (Figs 1 C, 2E); proventricle extending for ~1.5 segments, with ~13 muscle cell rows (Fig. 1 A, C).
Biology. One specimen showed intracoelomic oocytes in chaetigers 6–11 and long natatory chaetae, indicating that it was starting to reproduce by epigamy (Fig. 1 A).
Remarks. The only species of Amblyosyllis reported from Brazilian waters (Nogueira 2000) is A. formosa (Claparède, 1863), which has longer falciger blades (80–40 Μm) than A. granosa (42–22 Μm) and a trepan with monocuspidate teeth (tricuspidate in A. granosa).
However, we examined these Brazilian specimens identified as A. formosa and they actually belong to a different species, probably still undescribed. We do not include that species in the present paper because the state of preservation of the material available does not allow for a proper description of the species.
Type locality. Strait of Magellan (Atlantic Ocean).
Distribution. Pacific Ocean: Galápagos Islands. Atlantic Ocean: Strait of Magellan. First occurrence for the Brazilian coast.
description: Published as part of Fukuda, Marcelo V., Nogueira, João M. M. & Martín, Guillermo San, 2015, Eusyllinae and " Incertae sedis " syllids (Annelida: Syllidae) from South America, with a new species from Brazil and a new combination for a Peruvian species, pp. 507-537 in Zootaxa 3936 (4) on pages 509-511, DOI: 10.11646/zootaxa.3936.4.3, http://zenodo.org/record/233492