Exogone naidina Ørsted, 1845

Langeneck, Joachim, Musco, Luigi, Busoni, Giulio, Conese, Ilaria, Aliani, Stefano & Castelli, Alberto, 2018, Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species, Zootaxa 4369 (2), pp. 197-220 : 202

Exogone naidina Ørsted, 1845

Exogone naidina Ørsted 1845: 20 , Pl. 2; San Martín 1984a: 208, pl. 46.

Exogone (Exogone) naidina San Martín 2003: 262 ‒265, Figs 142‒143. San Martín 2005: 130 ‒131, Fig. 79.

Syllis longiseta Gosse 1855: 32 ‒33, Pl. 4, Figs 14‒21.

Gossia longiseta Quatrefages 1866: 49 .

Exogone gemmifera Pagenstecher 1862: 267 ; Fauvel 1923: 305, Figs 117a‒d; Day 1967: 274, Figs 12.10 p.v.; Ben-Eliahu 1977: 78, Fig. 7 .

Exogone kefersteinii Claparède 1863: 42 ‒44, pl. 12, Figs 3‒6 .

Schmardia chauseyana Quatrefages 1866: 65 ‒66, Pl. 8, Figs 16‒17.

Paedophylax levis Bobretzky 1870: 234 ‒238, Figs 54‒57.

Material examined. St. 8: 3 individuals.

Distribution. Allegedly cosmopolitan ( San Martín 2003).

Remarks. The examined material morphologically corresponds to E. naidina as described by San Martín (2003). The extremely wide geographical distribution, as well as the wide range of ecological conditions where this species occurs, however, led to speculate that it may actually represent a species complex, as supported by the occurrence of diploid and a tetraploid form in shallow Mediterranean waters ( Cognetti Varriale, 1967). Further molecular studies, together with detailed morphological analyses are needed to clarify the taxonomic status of this widely distributed species.

Figures

FIGURE 3. Exogone sophiae n. sp. Paratype (MSNP: P/0242/V) a) anterior end indorsal view. Holotype (MSNP:P/3879): b) pygidium in dorsal view; c) spiniger-like chaeta from chaetiger 5; d) compound falciger chaetae from chaetiger 5; e) dorsal simple chaeta.Scale-bar: a‒b: 0.20 mm; c‒d‒e: 7 µm.

FIGURE 4. Exogone sophiae n. sp. Paratype (MSNP: P/001/SEM) a) Prostomium in dorsal view, showing the absence of antennae; b) anterior end in ventral view; c) anterior parapodia in ventral view; d) spiniger-like chaeta from chaetiger 2; e) falciger-like chaetae from chaetiger 2.

FIGURE5. Parexogone wolfiSan Martín,1991 (St. 8, 110 m).a) anteriorend in dorsal view; b) compound chaetae.Scale-bar: a: 0.30 mm; b‒d:15 µm.

FIGURE 6. Prosphaerosyllis danovaroi n. sp. Holotype (MSNP: P/253/V): a) anterior end in dorsal view; b) close-up of the prostomium, dorsal view; c) compound chaetae; d) dorsal simple chaeta; e) ventral simple chaeta; f) acicula.Paratype (MSNP: P/239/V): g) anterior end in dorsal view. Scale-bar:a, g: 0.10 mm; b: 60 µm; c‒f: 6 µm.

FIGURE7. Syllis profunda Cognetti, 1955.Holotype (SZN: SZN-POL31, Grotta Azzurra, 100 m):a) compound chaetae from the anteriorpart of thebody; b) aciculae from the anterior part of the body; c) compound chaetae from the midbody; d) aciculae from the midbody; e) compound chaetaefrom the posterior part of the body; f)acicula from the posterior part of thebody.Nontype individual (St.9, 180 m):g) anterior end in dorsal view.Scale-bar:a‒f: 30µm; g: 0.40 mm