Trypanosyllis richardi Gravier, 1900

Rodríguez, Yolanda Lucas, Martín, Guillermo San & Fiege, Dieter, 2019, A new species and nine new records of Syllidae (Annelida) from the Socotra Archipelago (Indian Ocean), Zootaxa 4651 (2), pp. 235-258: 247-250

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Trypanosyllis richardi Gravier, 1900


Trypanosyllis richardi Gravier, 1900  

Figures 5 View FIGURE 5 , 8 View FIGURE 8 and 9 View FIGURE 9

Trypanosyllis richardi Gravier, 1900: 168   , pl. 9, figs. 12–13.

Material examined. Socotra, Shanitan , 600 m off cold store, 12º40.156N 54º02.850E, 8 m, from almost completely dead Acropora cf. valida   , 22.03.1999; 1 specimen (broken in two parts) ( SMF 24985 View Materials ) GoogleMaps   . Farun rock outcrop, 12º26.049N 52º08.07E, 9.5–12.5 m, 03.04.2000, 3 specimens ( SMF 24986 View Materials ) GoogleMaps   . Ras Qataninh Bay , dredge, 12º21.789N 53º31.399E to 12º21.780N 53º31.390E, 18-20 m, 09.04.2000, 1 specimen ( SMF 24987 View Materials ) GoogleMaps   . Hawlaf , off the jetty, 12º41.062N 54º04.508E, Galaxea   sp. colonies on sand, 12–14 m, 19.03.1999, 1 specimen ( NHCY 006) GoogleMaps   . Off Hawlaf dune, 12º40.519N 54º04.170E, from dead Acropora cf. valida   , 4-5 m, 21.03.1999, 1 specimen ( SMF 24989 View Materials ) GoogleMaps   . Off Quadub , fishery village, in front of airport, 12º38.945N 53º56.028E, from dead Galaxea   sp., 6-8 m, 18.03.1999, 1 specimen (including 5 permanent slides of parapodia) ( SMF 24990 View Materials ) GoogleMaps   .

Comparative material examined: Type material of Trypanosyllis richardi Gravier, 1900   was loaned from the Museum National d’Histoire Naturelle, Paris ( MNHN- IA-TYPE 1400).

Description. Longest and complete specimen from Socotra ( SMF 24990 View Materials ) 36.4 mm long (including a female stolon in formation), 2 mm wide, 207 chaetigers; remaining specimens all incomplete; one specimen ( SMF 24985 View Materials ) about 22 mm long, 1 mm wide; three specimens ( SMF 24986 View Materials ) about 21.42, 8.86, 18.57 mm long, and 1.78, 1.27, 1.57 mm wide respectively; longest incomplete specimen ( SMF 24987 View Materials ) 40.7 mm long, 1.7 mm wide with 140 chaetigers; one specimen ( NHCY 006) about 7.2 mm long, 1 mm wide; one specimen ( SMF 24989 View Materials ) 18.5 mm long, 1.4 mm wide. Holotype ( SMF 24990 View Materials ) incomplete, 42 mm long, 2 mm wide, 170-175 chaetigers, antennae and tentacular cirri white or showing only light brownish coloration, dorsal cirri unpigmented ( Fig. 8A View FIGURE 8 ). Body strongly dorso-ventrally flattened, ribbon-like, tapered posteriorly. Dorsum of each anterior segment with two transverse brownish lines, very close to each other, leaving only a thin unpigmented area in-between reaching posterior segments of proventricle, progressively less pigmented, reaching to most posterior segments. Prostomium oval, almost wider than long; posteriorly bilobed, each part showing a dark oblique mark, with a conspicuous cleft on posterior margin; two pairs of brown eyes in open trapezoidal arrangement; anterior pair larger than posterior. One pair of pear-shaped palps, similar in length to prostomium, completely separated. Median antenna inserted frontally, near anterior margin of prostomium, with 28 articles. Lateral antennae shorter, with 15 articles, emerging slightly posterior to median antenna. Tentacular segment small, reduced dorsally, with two pairs of tentacular cirri. Dorsal tentacular cirri with 63 articles, ventral ones with 14–15 articles. Dorsal cirri alternating in length ( Fig. 5 View FIGURE 5 D–E); longer cirri slightly longer than body width. First long dorsal cirri about 71 articles, next ones 51–71 articles; anterior short dorsal cirri about 19–33 articles. Midbody long dorsal cirri 22–25 articles; midbody short dorsal cirri 10–15. Posterior long dorsal cirri 40 articles; short ones 17–18. Ventral cirri digitiform, longer than parapodial lobes ( Fig. 5D View FIGURE 5 ). Anterior parapodia with about 12–13 compound chaetae, strongly heterogomph, shafts distally spinose, with falcigerous blades, bidentate, both teeth similar, short spines along margin ( Fig. 9A View FIGURE 9 ); gradation in length of blades 67 μm long above, 39 μm below. Number of chaetae per parapodium, and shape, varying gradually from anterior to posterior parapodia. Midbody parapodia each with 9–11 falcigers, similar to anterior ones but shorter, 54 μm above 38 μm below ( Fig. 9C View FIGURE 9 ); most dorsal chaetae similar to anterior ones, remaining chaetae, bidentate, proximal tooth small, acute ( Fig. 9C View FIGURE 9 ), distal tooth bigger and also pointed; interspace between distal and proximal tooth wide; blade with short spines on edge. Posterior parapodia with similar falcigers than midbody but slightly shorter, 8–9 in each parapodium 38 μm above ( Fig. 9E View FIGURE 9 ), 30 μm below. Anterior parapodia each with 4 straight aciculae of differ- ent sizes ( Fig. 9B View FIGURE 9 ); from midbody parapodia, 4 straight acicula per parapodium, one of them distinctly smaller than the others ( Fig. 9D View FIGURE 9 ); posterior parapodia with 2 similar aciculae, pointed ( Fig. 9F View FIGURE 9 ), one of them smaller. Pharynx and proventricle dissected ( Fig. 8B View FIGURE 8 ). Pharynx brownish, through 15 segments, slightly contracted, 2 mm long, 0.64 mm wide, surrounded anteriorly by a crown of 23–25 digitiform papillae ( Fig. 8 View FIGURE 8 B–C). Trepan with 7–8 brownish triangular teeth ( Fig. 8 View FIGURE 8 B–C). Proventricle through 16 segments, 2.64 mm long, 0.88 wide with about 31–33 muscle cell rows.

Remarks. Knox (1960) synonymized Trypanosyllis richardi   with T. taeniaeformis ( Haswell, 1886)   , which was previously synonymized with T. zebra   by Haswell (1920), including T. richardi   in the same synonymy. Trypanosyllis taeniaeformis   has a different colour pattern, although similar, with several slender transversal brown rows and other narrow bands of the same colour between the joints of the dorsal cirri ( Haswell, 1886). Probably these two species are different but it is difficult to prove because the type species of T. taeniaeformis   was lost (Australian Museum, pers. com.). In the present paper, we consider that T. richardi   is a valid species, based on the study of the type specimen, and the new material from Socotra that indeed is geographically close to Djibouti, the type-locality of T. richardi   . Trypanosyllis leivai Álvarez-Campos, Riesgo & San Martín, 2017   , from the Philippines, has proportionally more slender body, with similar colour pattern, but slightly different, having two reddish transversal bands per segment, one longer and slender, and the other shorter and wider (see Álvarez-Campos et al. 2017). Trypanosyllis californiensis Álvarez-Campos & Rouse, 2017   , from California, also has long dorsal cirri, but the body is markedly more slender than T. richardi   , and the two bands per segment are much thinner (see Álvarez-Campos et al. 2017). Trypanosyllis cristoboi Álvarez-Campos, Taboada, San Martín, Leiva & Riesgo, 2018   , from the Philippines, also has long dorsal cirri, but the body is also slender, there is a single, broad, pigmented band per parapodium on dorsum, and the chaetae have distinctly longer and slender articles (see Álvarez-Campos et al. 2018).

Compound chaetae of all these species are very similar, although having small differences. Only molecular data and differences in details of body and pigmentation pattern allow to distinguish these similar species (see Álvarez- Campos et al., 2017, 2018).

Habitat. On Socotra Island on corals and algae on hard substrate.

Distribution. Djibouti. New record for Socotra.


Forschungsinstitut und Natur-Museum Senckenberg














Trypanosyllis richardi Gravier, 1900

Rodríguez, Yolanda Lucas, Martín, Guillermo San & Fiege, Dieter 2019

Trypanosyllis richardi

Gravier, C. 1900: 168