Syllis bunaa, Sedick & Simon, 2019

Sedick, Safiyya & Simon, Carol, 2019, Three new species of Syllis Savigny in Lamarck, 1818 (Annelida: Syllidae) from the south coast of South Africa, Zootaxa 4688 (4), pp. 585-598 : 591-592

publication ID	https://doi.org/ 10.11646/zootaxa.4688.4.10
publication LSID	lsid:zoobank.org:pub:72F30F61-5C45-423D-B8DA-E78CC188C6B2
DOI	https://doi.org/10.5281/zenodo.5929899
persistent identifier	https://treatment.plazi.org/id/B7110550-8319-47CC-A78D-742C828958C0
taxon LSID	lsid:zoobank.org:act:B7110550-8319-47CC-A78D-742C828958C0
treatment provided by	Plazi
scientific name	Syllis bunaa
status	sp. nov.

Treatment

Syllis bunaa View in CoL sp. nov.

( Figures 3B View FIGURE 3 and 5 View FIGURE 5 )

urn:lsid:zoobank.org:act:B7110550-8319-47CC-A78D-742C828958C0

Material examined. 20 specimens. Mossel Bay (34°11’6.396”S; 22°9’34.649”E), South Africa, algal turf, lower intertidal, rocky shore, S. Sedick coll., October 2015. Holotype ( SAMC-A089057 ) GoogleMaps and four Paratypes, plus one slide of anterior, mid-body and posterior parapodia ( SAMC-A089058 ). Additional material examined . 15 specimens, same data as for Holotype and Paratypes GoogleMaps .

Description. Holotype complete specimen, robust, 6 mm long, 0.4 mm wide for 61 chaetigers (additional material 2–9 mm for 49–61 chaetigers). Body cylindrical, dorsally swollen, appearing rounder in cross section anteriorly than posteriorly, becoming less swollen toward posterior body ( Fig. 3B View FIGURE 3 ). Dark brown pigmentation, almost completely opaque on prostomium and anterior segments, fading toward posterior end, both in vivo and preserved specimens. Dark chocolate to light brown pigmentation that may extend to inner dorsal margins of palps. Intersegmental brown bars, starting just after proventricle, fading toward posterior. Prostomium oval; two pairs of similarly-sized red rounded eyes, in trapezoidal arrangement ( Figs 3B View FIGURE 3 , 5A View FIGURE 5 ). Median and lateral antennae, dorsal and tentacular cirri distinctly articulated ( Figs 3B View FIGURE 3 , 5A View FIGURE 5 ). Median antenna longer than palps and prostomium together, originating from middle of prostomium, with 17–23 articles ( Fig. 5A View FIGURE 5 ). Lateral antennae longer than palps, arising from anterior margin of prostomium, with 13–17 articles ( Fig. 5A View FIGURE 5 ). Palps basally fused, ovate, similar in length to prostomium. Peristomium shorter than subsequent segments; two pairs of tentacular cirri, dorsal pair with 14–24 articles, ventral pair with 13–18. Dorsal cirri shorter than or subequal to body width, long dorsal cirri with 13–20 articles anteriorly, up to 27 articles in larger specimens, 12–19 articles on midbody parapodia, up to 34 in largest specimens. In holotype dorsal cirri with 27 & 25, 11 & 18, and 21 & 19 articles on left and right parapodia of chaetigers 1 to 3, respectively, up to 22 articles in midbody. Ventral cirri short, not extending beyond parapodial lobes. Parapodia conical, slender. Anterior parapodia each with 6–13 compound chaetae, 6–10 in mid-body, 5–8 in posterior parapodia. Compound chaetae heterogomph bidentate falcigers, with moderately long, thin spines on blades, fine spines on basal margin in some chaetae ( Fig. 5 View FIGURE 5 B–D). Proximal tooth always shorter than distal tooth, becoming progressively smaller in mid- to posterior body ( Figs 5 View FIGURE 5 B-D). Dorso-ventral gradation in length of blades; 26 µm to 24 µm in anterior; 30 µm to 23 µm in midbody; 24 µm to 22 µm in posterior. On anterior body, length of teeth on falciger blades appear uniform in length but top-most teeth shorter, especially on longer falciger blades. On mid- and posterior body, a clear gradation in length of teeth exists, bottom-most teeth longest. Chaetae with shorter falciger blades may have shorter teeth. Pseudo-simple chaetae by loss of blades and enlargement of shafts differ from shafts of compound falcigers in having broad, narrow shaft, rounded tip or narrow shaft with wide pointed tip ( Fig. 5E View FIGURE 5 ). Up to three pseudo-simple chaetae may be present in anterior and mid-body only, or along the whole body. Solitary dorsal capillary simple chaetae on posterior parapodia, straight, thick with rounded tip ( Fig. 5F View FIGURE 5 1 View FIGURE 1 ). Solitary ventral capillary chaetae thin and pointed ( Fig. 5F View FIGURE 5 2 View FIGURE 2 ) or thick with serrations along inner edge of chaetal shaft ( Fig. 5F View FIGURE 5 ). Up to three aciculae in each anterior body parapodium of four types: narrow, acuminate, rounded point ( Fig. 5G View FIGURE 5 , 1 View FIGURE 1 , 2 View FIGURE 2 , 3 View FIGURE 3 ) or distally bent ( Fig. 5G View FIGURE 5 4 View FIGURE 4 ). Two aciculae in each mid-body parapodium; broad, acuminate, rounded point ( Fig. 5H View FIGURE 5 1 View FIGURE 1 ) or bent, rounded tip ( Fig. 5H View FIGURE 5 2 View FIGURE 2 ). One or two aciculae in each posterior body parapodium: broad, acuminate, with rounded tips ( Fig. 5I View FIGURE 5 1 View FIGURE 1 ) or narrow, pointed tip ( Fig. 5I View FIGURE 5 2 View FIGURE 2 ). Pharynx extends through 5–8 chaetigers; mid-dorsal pharyngeal tooth small, teardrop shaped, located on anterior margin of pharynx. Proventricle extends through 5–8 chaetigers, with about 26 muscle cell rows ( Fig. 5A View FIGURE 5 ). Two anal cirri, with 9–16 articles. Pygidium rounded, no median stylus.