Syllis ergeni Çinar, 2005

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 : 2-4

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.11232904

persistent identifier

https://treatment.plazi.org/id/E04787CB-FFCC-5427-7DF2-80F5FBBB643D

treatment provided by

Plazi

scientific name

Syllis ergeni Çinar, 2005
status

 

Syllis ergeni Çinar, 2005 View in CoL

Figures 1 View FIGURE 1 , 2 View FIGURE 2

Syllis ergeni Çinar, 2005: 45 View in CoL View Cited Treatment , figs 2–4.

Material examined. AUSTRALIA, WESTERN AUSTRALIA: Rottnest Island, Longreach Bay , 32° S, 115° 30’ E, 25 Jun 2008, on algae, 1 m, coll. M. T. Aguado & G. San Martín, AM W.33398, 1 specimen GoogleMaps ; Houtman Abrolhos Islands, east side of Rat Island , 28° 44’ S, 113° 47’ E, 21 June 2008, on algae associated with Posidonia , 1 m, coll. M. T. Aguado & G. San Martín, AM W.33386, 1 specimen GoogleMaps .

Description. Both complete specimens; longest specimen 5 mm long, 0.48 mm wide, 65 chaetigers. Body large anteriorly, markedly convex, becoming tapered from midbody, uniformly brown dark dorsally on most anterior segments, becoming lighter from midbody, with a transverse brown band on anterior margin of each segment and few, scattered lines on other part, and without any colour on posterior segments ( Fig. 1A, C View FIGURE 1 ). Under high magnifications, dorsum with three kinds of spots, most numerous ones dark brown, others light brown and some rounded areas without any colour. Body and appendages strongly contracted by fixation. Prostomium oval, with two large pairs of eyes in open trapezoidal arrangement, and some brown patches. Antennae thick, coiled, difficult to count articles; median antenna inserted on posterior part of prostomium, with about 19 articles; lateral antennae inserted on anterior margin, in front of anterior eyes, with about 17 articles. Palps large, ventrally folded ( Fig. 1B View FIGURE 1 ). Peristomium shorter than subsequent segments. Dorsal tentacular cirri coiled, with about 24 articles; ventral tentacular cirri shorter, with about 14 articles. Dorsal cirri thick, shorter than body width, with about 23 articles in long and 12 in short ones; antennae, tentacular and dorsal cirri pale, markedly lighter than dorsum ( Fig. 1A–C View FIGURE 1 ). Parapodia conical, broad, ending in small dorsal and ventral papillae. Compound chaetae heterogomph, bidentate falcigers, with proximal teeth acute, smaller than distal teeth and moderate, straight spines on margin ( Fig. 2A–C View FIGURE 2 ). Anterior parapodia with 11–12 chaetae, all similar, blades 26 µm above, 20 µm below ( Fig. 2A View FIGURE 2 ); midbody parapodia with 9–10 chaetae, blades 22 µm above, 19 µm below ( Fig. 2B View FIGURE 2 ); posterior parapodia with 5–7 compound chaetae, all blades similar, strongly bidentate, 20–16 µm long ( Fig. 2C View FIGURE 2 ). Dorsal simple chaetae on posterior parapodia, distally bifid, apparently smooth ( Fig. 2D View FIGURE 2 ). Ventral simple chaetae on most posterior parapodia, apparently smooth, distally bidentate with proximal tooth smaller than distal one ( Fig. 2E View FIGURE 2 ). Anterior parapodia with 3–4 slender aciculae, distally blunt ( Fig. 2F View FIGURE 2 ), number of aciculae reducing to two in midbody parapodia one acuminate and one blunt ( Fig. 2G View FIGURE 2 ) and single on posterior parapodia, distally slightly oblique ( Fig. 2G View FIGURE 2 ). Pygidium with two long anal cirri. Pharynx and proventricle not seen in dorsal view; in ventral view, proventricle between segments 10 to 18, with about 25 muscle cell rows.

Remarks. These two specimens agree quite well with the original description of Syllis ergeni made by Çinar (2005), based on specimens from the Eastern Mediterranean. However, the pigmentation is slightly different; in the Mediterranean specimens it is dark brownish in the anterior segments, becoming pale progressively posteriorly, but in the Australian specimens the anterior segments have three kinds of spots (dark brown, pale brown and rounded unpigmented areas), and the median segments have one anterior line and only scattered patches of colour. Furthermore, the Mediterranean specimens have numerous spherical glands on anterior segments and bacillary glands on posterior segments, which are lacking on the Australian specimens.

The original description was based on specimens collected from Izmir Bay, Turkey a harbour with contaminated sediments. Çinar (2005) hypothesized that it is probably an introduced species from the Indo-Pacific. Certainly, some specimens examined from Kuwait are identical with this Australian material (unpublished data).As it was also found in the Red Sea and predominantly occurs in the Levant Sea, it was considered as an alien species introduced to the Mediterranean via the Suez Canal (Lessepsian migrant) ( Çinar et al., 2017, 2021)

T

Tavera, Department of Geology and Geophysics

AM

Australian Museum

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

SubFamily

Syllinae

Genus

Syllis

Loc

Syllis ergeni Çinar, 2005

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

Syllis ergeni Çinar, 2005: 45

Cinar, M. E. 2005: 45
2005
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