Typhloscolex cf. muelleri Busch, 1851

Typhloscolex cf. muelleri Busch, 1851 View in CoL

( Figs 1 View FIGURE 1 , 10C View FIGURE 10 )

Typhloscolex mülleri [alternative spelling] Busch, 1851: 115, Pl. XI, Figs. 1–6 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 [original description, Adriatic Sea, Triest].– Reibisch 1895, 52–53, Pl. V, Figs. 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 [description, Central Atlantic].– Støp-Bowitz 1948: 55 [brief description, South Atlantic].– Friedrich 1950: 311–312, Fig. 1 c View FIGURE 1 [brief description, South Atlantic].– Tebble 1958, p. 166 [distribution, South Atlantic].– Dales 1957: 146, Fig. 55 [description, Pacific], 1959: 485 [distribution, South China Sea and Malacca Strait].

Typhloscolex muelleri Ushakov 1955: 112 View in CoL , Fig. 14 View FIGURE 14 [description, North Pacific], 1972: Pl. XXXII, Figs. 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 [description, North-East Pacific].– Day 1967, 208, Fig. 9.1 a–b View FIGURE 9 [brief description, off South Africa, Madagascar].– Fernández-Álamo 2003: 647–657 [distribution, Central Pacific], 2006: 210–215 [distribution, Central Pacific].

Typhloscolex mulleri [alternative spelling]Peter1975:48, Fig.3 View FIGURE 3 [distribution,Indian Ocean,WestAustralian Current].– Fernández-Álamo 1991: 99–101 [distribution, Central Pacific].– Fernández-Álamo & Sanvicente-Añorve 2005: 234–236 [distribution, Central Atlantic].

Sagitella bobretskii Wagner, 1872: 347 , Figs 1–2 View FIGURE 1 View FIGURE 2 [original description, Bay of Naples].

Sagitella barbata Uljanin, 1878: 6 , Pl. I, Fig. 2 View FIGURE 2 [original description, Mediterranean, Naples and Villefranche-sur-Mer].

Material examined. Four specimens: ZMMU WS25592 View Materials (Et), ZMMU WS20977 View Materials , ZMMU WS25591 View Materials , ZMMU WS25594 View Materials (FA) .

Description (based on all our specimens). Body 1.2 mm long, 0.2 mm wide without parapodia, 0.4 mm wide with parapodia and cirri with 15–23 chaetigers of body trunk. Live worms semitransparent, with orange parapodial cirri, preservedspecimens white. Prostomium mushroom-shaped, round in frontal view, 0.9 body diameter; dorsal and ventral prostomial lobes of similar size, with dorsal and ventral marginal belts of long thick cilia ( Fig. 10C View FIGURE 10 ). Apical palpodium consists of cylindrical base and thin distal part ( Fig. 10C View FIGURE 10 ). Nuchal lappets rounded, ciliated, attached to base of dorsal prostomial lobe ( Fig. 10C View FIGURE 10 ). Extended proboscis not observed. Three anterior cirri situated in angle, 1 st (cephalic) and 3 rd (neck) situated one above another, whereas 2 nd (neck) one displaced ventrally. First (cephalic) cirrus cordiform (with anterior cleft or notch) or butterfly-shaped (with anterior notch and posterior cleft), 2 nd and 3 rd (neck) cirri bean-shaped or oval. All following segments (chaetigers) with dorsal and ventral podial cirri ( Fig. 10C View FIGURE 10 ). Dorsal cirri cordiform-rounded in mid-region, oval in posterior; the largest ones in the middle of the body. Ventral cirri of same shape, usually slightly smaller, than dorsal. Parapodia start from 3 rd chaetiger, small, conical, uniramous, each with two simple recurved capillary chaetae, and one thick aciculum penetrating epidermis. Caudal cirri oval ( Fig. 10C View FIGURE 10 ).

Distribution. Cosmopolitan. Red Sea (this study).

Remarks. Our T. cf. muelleri specimens do not have reliable morphological differences from T. mullerii specimens from the Atlantic. However, 18S and 28S LSU markers show significant difference; therefore, we use a “cf.” qualifier, as recommended in Sigovini et al. (2016).