Ancistrosyllis hartmanae Pettibone, 1966

Ribeiro, Rannyele Passos, Barbosa, Aline Da Cruz, Freitas, Roberta, Zanol, Joana, Glasby, Christopher J. & Ruta, Christine, 2020, Pilargidae (Annelida: Phyllodocida) from coastal and deep waters of the Southwestern Atlantic, with descriptions of two new species, Zootaxa 4878 (1), pp. 56-76 : 61-62

Ancistrosyllis hartmanae Pettibone, 1966

Figure 4 A–E

Ancistrosyllis hartmanae Pettibone, 1966: 172 , fig. 7a–c.

Material examined. BRAZIL: Campos Basin : 21º28’2.071”S, 40º56’16.956”W, 15 m, three specimens, 20.vii.2009 (MNRJP-002706); 21º47’12.706”S, 40º57’37.349”W, 16 m, three specimens, 19.vii.2009 (MNRJP- 002707); 21º44’44.245”S, 40º43’9.558”W, 21 m, two specimens, 19.vii.2009 (MNRJP-002708); 21º49’57.895”S, 40º49’5.472”W, 23 m, one specimen, 19.vii.2009 (MNRJP-002709); 21º39’31.133”S, 40º31’25.825”W, 28 m, two specimens, 13.iii.2009 (MNRJP-002710); 22º11’32.065”S, 40º55’24.159”W, 44 m, one specimen, 12.iii.2009 (MN- RJP-002711); 22º6’55.321”S, 40º38’59.972”W, 53 m, two specimens, 17.vii.2009 (MNRJP-002712); 22º3’41.420”S 40º24’9.883”W, 56 m, two specimens, 17.vii.2009 (MNRJP-002713); 21º43’44.547”S, 39º55’16.948”W, 1,395 m, one specimen, 27.vi.2008 (MNRJP-002714).

Description. Fixed specimens whitish. Largest specimen with 134 chaetigers, 50 mm length and 0.26 mm width (MNRJP-002707). Body dorsoventrally flattened, ventral and dorsal surfaces papillate ( Fig. 4 A–D). Prostomium small with two lateral antennae anteriorly located to median antenna. Median antenna on the posterior region of prostomium, hidden by peristomium, and half the length of lateral antennae ( Fig. 4B, C ). Two deep-set eyes anterior to median antenna ( Fig. 4B ). Two biarticulated palps, palpophore large and palpostyle diminutive. Proboscis not observed. Peristomium indistinctly set off from prostomium, with two pairs of tentacular cirri of similar length and 1.4x longer than lateral antennae ( Fig. 4C ). Parapodia biramous ( Fig. 4D ). Dorsal and ventral parapodial cirri of similar length, and becoming progressively shorter from middle to posterior region. Ventral cirri from third to last chaetiger. Notopodial hooks present from third to last chaetiger ( Fig. 4A, D ). Neuropodial lobes tapered with four simple and long bidentate chaetae, some chaetae with serrated tips. Pygidium tapered with two cirri covered by papillae ( Fig. 4E ).

Distribution. Atlantic Ocean—USA, Maryland ( Pettibone 1966), Gulf of Mexico, Off Florida and Texas ( Wolf 1984); Brazil, specimens examined in this study. Pacific Ocean—Costa Rica, Golfo Dulce ( Dean 1998).

Remarks. Ancistrosyllis hartmanae of this study have ventral cirri beginning on the third chaetiger, thus differing from those of A. groenlandica , which have ventral cirri beginning on the first chaetiger. The specimens described herein have two lateral antennae and one median antenna, differing from the ones of A. hamata , which lack a median antenna. The position of the first pair of hooks in A. hartmanae (from chaetiger 3) differs from other similar species as A. groenlandica (from chaetigers 3–4), A. hamata (from chaetigers 4–7) and A. jonesi (from chaetiger 7). Ancistrosyllis hartmanae also differ from those three species in having more reduced parapodia. No morphological differences were found between the specimens of this study and the specimens described by Wolf (1984). This is the first record of A. hartmanae for Brazil.

Figures

FIGURE 4. Ancistrosyllis hartmanae. A. Whole body, dorsal view. B. Prostomium showing antennae, dorsal view. C. Anterior end showing tentacular cirri, ventral view. D. Parapodia from midbody segments showing notopodial hooks and chaetae, ventral view. E. Posterior end, ventral view. Asterisks indicate eyes. Abbreviations. La: lateral antenna, Ma: median antenna, Nh: notopodial hook, Pa: papilla, Pp: palp, Ps: palpostyle, Pt: prostomium, Py: pygidium Pyc: pygidial cirrus, Tdc: tentacular dorsal cirrus, Tvc: tentacular ventral cirrus. Scale bars: 400 µm (A), 50 µm (B, E), 100 µm (C, D).