Syllis ypsiloides Aguado, San Martín & ten Hove, 2008

Martín, Guillermo San, Lucas, Yolanda & Hutchings, Pat, 2024, The genus Syllis Savigny in Lamarck, 1818 (Annelida: Syllidae: Syllinae) from Australia (Fourth part), Zootaxa 5453 (1), pp. 1-32 : 18

publication ID

https://doi.org/ 10.11646/zootaxa.5453.1.1

publication LSID

lsid:zoobank.org:pub:FD39F253-3F08-466B-8928-B485B98E19EE

DOI

https://doi.org/10.5281/zenodo.11232926

persistent identifier

https://treatment.plazi.org/id/E04787CB-FFDC-5435-7DF2-846CFCC26430

treatment provided by

Plazi

scientific name

Syllis ypsiloides Aguado, San Martín & ten Hove, 2008
status

 

Syllis ypsiloides Aguado, San Martín & ten Hove, 2008 View in CoL

Figure 12 View FIGURE 12

Syllis ypsiloides Aguado, San Martín & ten Hove, 2008: 36 View in CoL View Cited Treatment , figs 16–18.

Material examined. AUSTRALIA, QUEENSLAND: Torres Strait, Prince of Wales Island, bommies northwest of Bamfield Point , 10° 41’ 7” S, 142° 6’ 1” E, coll. 3 Oct 2006, by SCUBA, 3 m, from rocks, AM W.54246, 3 specimens GoogleMaps ; Keppel Island , 23° 09’ S, 151° 00 E, 51 m, coll. T. Nielson, 1 Aug 1970, AM W.4382, 1 specimen GoogleMaps . NEW SOUTH WALES: Sydney Harbour, White Bay Berth 3, 33° 51’ 47” S, 151° 11’ 00” E, coll. M. Capa, K. B. Attwood, R. T. Springthorpe & G. Fonseca, 5 Mar 2009, from wharf piles, 11.8 m, G. San Martin id., AM W.54887, 2 specimens GoogleMaps .

Description. Body long and slender, longest specimen (incomplete) 18 mm long, 0.8 mm wide, 96 chaetigers, without colour markings or single, faint transverse reddish band on anterior segments ( Fig. 12A View FIGURE 12 ) on large specimens. Prostomium rounded, with two pairs of small eyes in open trapezoidal arrangement apparently without eyespots. Median antenna inserted on middle of prostomium, longer than combined length of prostomium and palps, with 19 articles; lateral antennae inserted in front of anterior eyes, shorter than median antenna, with 12₋₋15 articles. Palps similar in length to prostomium ( Fig. 12A View FIGURE 12 ). Peristomium shorter than subsequent segments; dorsal tentacular cirri slightly shorter than median antenna, with 23 articles; ventral tentacular cirri distinctly shorter than dorsal ones, with about 12 articles. Dorsal cirri of first chaetiger long, with 28₋₋29 articles. Anterior dorsal cirri elongated, alternating long and short cirri, long ones similar in length to body, with about 17₋₋20 articles, shorter ones with about 12 articles; chaetigers from end of pharynx dorsal cirri shorter, all similar, alternating long ones with 14 articles and short ones, with 12 articles ( Fig. 12A View FIGURE 12 ). On midbody, dorsal cirri short, fusiform, alternating with some elongated ones, with 11 articles, and thick ones, with eight articles ( Fig. 12B View FIGURE 12 ); on posterior chaetigers dorsal cirri spindle-shaped, shorter and thicker, with about eight articles ( Fig. 12C View FIGURE 12 ). Anterior parapodia with about 10 compound chaetae each; blades elongated, distally acute, bidentate with small proximal tooth and short spines on margin; blades with marked dorso-ventral gradation, 43 µm above, 20 µm below ( Fig. 12D View FIGURE 12 ); posteriorly, number of chaetae reduced to only two, one ypsiloid, large and other much smaller, with thick shaft and small, short, smooth blade, not fused to shaft ( Fig. 12E View FIGURE 12 ). Anterior parapodia with three thin, acuminate aciculae ( Fig. 12F View FIGURE 12 ); from midbody onwards two thicker aciculae ( Fig. 12G View FIGURE 12 ). Pharynx long, through 17 segments; pharyngeal tooth conical, on anterior margin of pharynx. Proventricle long, through nine segments, with about 45 muscle cell rows.

Remarks. Syllis ypsiloides is very similar to S. picta ( Kinberg, 1866) redescribed in a previous paper ( Álvarez-Campos et al., 2015a); they differ mainly in the number of non- fused, compound chaetae in midbody parapodia, with two in S. picta and only one in S. ypsiloides .

Habitat. Sandy and muddy bottoms with dead corals and sponges, sublittoral to 55 m.

Distribution. Indonesia and Australia (QLD, NSW).

AM

Australian Museum

T

Tavera, Department of Geology and Geophysics

R

Departamento de Geologia, Universidad de Chile

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

SubFamily

Syllinae

Genus

Syllis

Loc

Syllis ypsiloides Aguado, San Martín & ten Hove, 2008

Martín, Guillermo San, Lucas, Yolanda & Hutchings, Pat 2024
2024
Loc

Syllis ypsiloides Aguado, San Martín & ten Hove, 2008: 36

Aguado, M. T. & San Martin, G. & ten Hove, H. 2008: 36
2008
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