Erinaceusyllis carrascoi, Soto & Martín, 2017
publication ID |
https://doi.org/ 10.11646/zootaxa.4353.3.7 |
publication LSID |
lsid:zoobank.org:pub:452992DC-3E00-4E57-9484-608D4463B8BB |
DOI |
https://doi.org/10.5281/zenodo.6003693 |
persistent identifier |
https://treatment.plazi.org/id/EE67F120-3B7E-FFC9-FF32-FF36FAF4F859 |
treatment provided by |
Plazi |
scientific name |
Erinaceusyllis carrascoi |
status |
sp. nov. |
Erinaceusyllis carrascoi View in CoL new species
Figure 6 View FIGURE 6
Material examined. Station 41, holotype ( MNCN 16.01/17769) and paratype. Station 36 (2) ( LBUV).
Description. Holotype complete female carrying eggs dorsally. Body small to minute, 2.2 mm long, 0.18 mm wide, with 24 chaetigers; body covered with small, scattered papillae ( Fig. 6A View FIGURE 6 ). Prostomium oval, wider than long; four large eyes in trapezoidal arrangement, nearly in line, and two anterior eyespots; antennae spindle-shaped, basally bulbous; medial tentacle detached in both specimens; lateral antennae inserted slightly anteriorly to anterior pair of eyes, each bulbous basally, with short tips ( Fig. 6A View FIGURE 6 ). Palps shorter than prostomium, fused along their length, with a median scar. Peristomium shorter than subsequent segments, forming a bilobate fold over posterior part of prostomium; tentacular cirri similar to lateral antennae. Dorsal cirri lacking on chaetiger 2; anterior dorsal cirri similar to lateral antennae, basally inflated, spherical, but with longer tips and some minute, rounded papillae, and some with internal, granular glands ( Fig. 6A View FIGURE 6 ); papillae becoming progressively longer on mid-body, with less bulbous bases and much longer tips, then becoming shorter again on posterior parapodia ( Fig. 6B View FIGURE 6 ). Parapodial lobes conical, with few short papillae and one long distal papilla posterior to acicula and two ventrolateral papillae on anterior surface ( Fig. 6C View FIGURE 6 ). Ventral cirri short, digitiform. Compound chaetae heterogomph, with smooth shafts; blades elongate, slender, unidentate, slightly hooked distally, with short marginal spines ( Figs 6E, G View FIGURE 6 ); anterior parapodia each with seven compound chaetae, each with slight dorso-ventral gradation in length, 25 mm above, 20 mm below; number of compound chaetae and length of blades decreasing posteriorly; posterior parapodia each with four compound chaetae, similar to those of anterior parapodia, blades similar but shorter, about 20 mm above 15 mm below. Dorsal simple chaetae from chaetiger 1, each distally entire, smooth, slender, and curved ( Fig. 6D, F View FIGURE 6 ). Ventral simple chaetae on posterior parapodia, similar to dorsal simple chaetae but shorter and slender ( Fig. 6H View FIGURE 6 ). Acicula solitary, acuminate ( Figs. 6C View FIGURE 6 ). Pharynx proportionally slender, through four segments; pharyngeal tooth small, oval, located near opening ( Fig. 6A View FIGURE 6 ). Proventricle barrel-shaped, through three segments, with about 15 muscle cell rows. Pygidium small, with two long anal cirri, similar to dorsal cirri of midbody.
Remarks. Erinaceusyllis carrascoi n. sp. is characterized by having compound chaetae with slender, unidentate blades with short, straight spines on margin, lack of dorsal cirri on chaetiger 2, and presence of papillae on parapodia and dorsal cirri.
About 12 species of Erinaceusyllis have unidentate compound chaetae, but none has long papillae on the parapodial lobes and papillae on the dorsal cirri, except E. cirripapillata San Martín, 2005 from Australia. However, that species has longer, mushroom-shaped papillae on the dorsal cirri ( San Martín, 2005); these are short and rounded in E. carrascoi n. sp.
Erinaceusyllis horrockensis (Hartmann-Schröder, 1981) , also from Australia, has similar compound chaetae, but has dorsal cirri on chaetiger 2 ( San Martín, 2005). Erinaceusyllis centroamericana (Hartmann-Schröder, 1959) View in CoL a circuntropical species, E. serratosetosa (Hartmann-Schröder, 1982) View in CoL from Australia, also reported to the Western Mediterranean, and E. ettienei San Martín, 2005 from Australia, have compound chaetae with longer blades and longer spines on the margin ( San Martín, 2005). Erinaceusyllis opisthodentata (Hartmann-Schröder, 1987) View in CoL , E. kathrynae San Martín, 2005 View in CoL , and E. hartmannschroederae San Martín, 2005 View in CoL , all from Australia have, in contrast with the previous species, compound chaetae with short blades, E. opisthodentata View in CoL also with the pharyngeal tooth located more posteriorly than in E. carrascoi View in CoL n. sp. ( San Martín, 2005).
Erinaceusyllis nana Ding & Westheide, 2008 View in CoL , an even smaller species from China, has very similar compound chaetae, but lacks long papillae on the parapodial lobes and has smoth dorsal cirri ( Ding & Westheide, 2008).
Erinaceusyllis bidentata ( Hartmann-Schröder, 1974) View in CoL from East Africa, Australia and Chile, also has papillae on the dorsal cirri, but the compound chaetae are bidentate ( San Martín, 2005).
Finally, E. erinaceus ( Claparède, 1863), from N Atlantic and N Pacific, has longer compound chaetae with longer marginal spines, and lacks papillae on the dorsal cirri and long papillae on the parapodia ( Verdes et al., 2013).
Distribution. Chilean Patagonia: from Concepción channel to Magellan Strait (50°16 ʹS - 54°57 ʹ S).
Habitat. Shallow subtidal (30 m). Inside tubes of Chaetopterus cf. variopedatus in fjords and channels from Patagonia. Salinity: from 30.2 to 35 PSU, temperature: from 8.7 to 8.9°C.
Type locality. Concepción channel, Drumond Hay Island (Chilean Patagonia).
Etymology. This species is named to honor the late Dr. Franklin Carrasco, Chilean polychaetologist.
MNCN |
Museo Nacional de Ciencias Naturales |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Genus |
Erinaceusyllis carrascoi
Soto, Eulogio H. & Martín, Guillermo San 2017 |
E. carrascoi
Soto & Martín 2017 |
Erinaceusyllis nana
Ding & Westheide 2008 |
E. ettienei San Martín, 2005
San Martin 2005 |
E. kathrynae San Martín, 2005
San Martin 2005 |
E. hartmannschroederae San Martín, 2005
, San Martin 2005 |