Amblyosyllis granosa Ehlers, 1897

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, Zootaxa 3936 (4), pp. 507-537 : 509-511

publication ID	https://doi.org/ 10.11646/zootaxa.3936.4.3
publication LSID	lsid:zoobank.org:pub:8CEB9BA3-521A-45A9-AC45-81F36A99FAB6
DOI	https://doi.org/10.5281/zenodo.5619322
persistent identifier	https://treatment.plazi.org/id/A5678797-FFE4-FFD6-FF68-FEDAD434A182
treatment provided by	Plazi
scientific name	Amblyosyllis granosa Ehlers, 1897
status

Treatment

Amblyosyllis granosa Ehlers, 1897 View in CoL

Figures 1–2 View FIGURE 1 View FIGURE 2

Amblyosyllis granosa Ehlers, 1897: 58 View in CoL ; 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 View FIGURE 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 View FIGURE 1 A–B); nuchal epaulettes relatively short, extending until close to posterior border of chaetiger 1 ( Fig. 1 View FIGURE 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 View FIGURE 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 View FIGURE 1 A). Antennae and cirri throughout with yellow to reddish granular inclusions ( Fig. 1 View FIGURE 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 View FIGURE 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 View FIGURE 2 A–B). Dorsal and ventral simple chaetae not observed. Anterior parapodia with up to 5 aciculae each ( Fig. 2 View FIGURE 2 C), progressively less aciculae per parapodium towards posterior body, last ones with only 2 aciculae each ( Fig. 2 View FIGURE 2 D); aciculae differing from each other only in thickness, all straight, distally pointed, tips protruding from parapodial lobes ( Fig. 2 View FIGURE 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 View FIGURE 1 C); trepan with 6 tricuspidate teeth inserted in lobate base ( Figs 1 View FIGURE 1 C, 2E); proventricle extending for ~1.5 segments, with ~13 muscle cell rows ( Fig. 1 View FIGURE 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 View FIGURE 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.