Diopatra marinae, Steiner & Amaral, 2021

Seixas, Victor Corrêa, Steiner, Tatiana Menchini, Solé-Cava, Antônio Mateo, Amaral, Antonia Cecília Zacagnini & Paiva, Paulo Cesar, 2021, Hidden diversity within the Diopatra cuprea complex (Annelida: Onuphidae): morphological and genetics analyses reveal four new species in the south-west Atlantic, Zoological Journal of the Linnean Society 191, pp. 637-671 : 646-647

DIOPATRA MARINAE STEINER & AMARAL SP. NOV.

( FIGS 6–11)

lsid:zoobank.org:act: 3F3D5E23-9AA2-4137-8639- 5C24672FE293

Holotype: ZUEC POL 10693; 13°23’23’’S; 38°56’05’’W; intertidal; Brazil, Bahia State, Tinharé Island, Morro de São Paulo, Third Beach ; 12.VIII.2010; coll. André Lanna and Victor Seixas (specimen BA10A).

Paratypes: ZUEC POL 2907 (one spec.); 07°08’S; 34°47’W; intertidal, Brazil, Paraíba State, João Pessoa, Ponta do Seixas ; 19.VIII.2001; coll. Solé-Cava A. (specimen number 4, jaws removed) . ZUEC POL 2971 (two spec.); 19°56’29’’S; 40°08’27’’W;intertidal, Brazil,EspíritoSantoState, Aracruz, Coqueiral Beach ; 5.VIII.2001; coll. P. Marsh, P.C. Paiva and C. M. Voloch (specimens 14 jaws removed, and 48) . ZUEC POL 2972 (three spec. numbers 6, 22, 23, 50) , ZUEC POL 2973 (four spec. numbers seven jaws removed, 19; 30 and 32 are younger) , ZUEC POL 2974 (five spec. numbers 27 and 28 area younger; 29, 55, 56); 19°56’29’’S; 40°08’27’’W; intertidal, Brazil, Espírito Santo State, Aracruz, Coqueiral Beach ; 5.VIII.2001; coll. P. Marsh, P. C. Paiva and C. M. Voloch. ZUEC POL 10691 (one spec. BA07A) , ZUEC POL 10694 (one spec. BA05A jaws removed) , ZUEC POL 10696 (one spec. BA06A) , ZUEC POL 10697 (one spec. BA03A) , ZUEC POL 10698 (one spec. BA04A jaws removed) , ZUEC POL 10699 (one spec. BA09A) , ZUEC POL 10731 (one spec. BA11A jaws removed) , ZUEC POL 10734 (one spec. BA12A); 13°23’23’’S; 38°56’05’’W; intertidal; Brazil, Bahia State, Tinharé Island, Morro de São Paulo, Gamboa Beach ; 12.VIII.2010; coll. A. Lanna and V. C. Seixas . ZUEC POL 12493 (one spec. RN01 ) , ZUEC POL 12494 (one spec. RN02 ) , ZUEC POL 12495 (one spec. RN03 ) , ZUEC POL 12498 (one spec. RN06 ) , ZUEC POL 12499 (one spec. RN07 jaws removed) , ZUEC POL 12500 (one spec. RN08 ); 05°53’S; 35°09’W; intertidal, Brazil, Rio Grande do Norte State, Natal, Ponta Negra Beach; 18. V.2011; coll. V. C. Seixas and N. E. Sanchez . ZUEC POL 12496 (one spec. RN04 ) , ZUEC POL 12497 (one spec. RN05 ) , ZUEC POL 12501 (one spec. RN09 jaws removed) , ZUEC POL 12502 (one spec. RN11 ) , ZUEC POL 12503 (one spec. RN10 ); 05°53’S; 35°09’W; intertidal, Brazil, Rio Grande do Norte State, Natal, Ponta Negra Beach; 16. V.2011; coll. V. C. Seixas and A. Pádua .

Other material: ZUEC POL 2954 (three spec.) ; 23°37’30’’S; 45°23’57’’W;intertidal; Brazil, São Paulo State, Caraguatatuba, Cidade Beach ; 4.IV.2001; coll. A. Cecília Z. Amaral’s team (jaws removed from one specimen) . ZUEC POL 2957 (11 spec.) ; 23°36’50’’S; 45°19’32’’W; 5.3 m; Brazil, São Paulo State, Caraguatatuba ; 28.VII.2001; coll. Adilson Fransozo’s team (jaws removed from two specimens) . ZUEC POL 2959 (one spec. – jaws removed); 23°30’02’’S; 45°06’21’’W; 5 m; Brazil, São Paulo State, Ubatuba ; 21.III.2002; coll. Adilson Fransozo’s team . ZUEC POL 2961 (two spec.) ; 23°37’24’’S; 45°24’21’’W; intertidal; Brazil, São Paulo State, Caraguatatuba, Cidade Beach ; 18.IX.2001; coll. A. Cecília Z. Amaral’s team (jaws removed from one specimen; collected and cultured in aquarium for two years) .

Diagnosis: MPs with similar sizes and acicular lobe with a (slender) projection. Bidentate and hooded HO, PA in different positions (except HOL, without PA) in first parapodium; PA varying in position in other MP; HOL more robust than others HO. Pectinate chaetae slightly asymmetrical, with 17–26 teeth. Inner callus of MI at an obtuse angle to its above portion. MIId without a convex curvature projected backwards. MIV not compressed laterally; inner arch of MIVd less pronounced; internal base of MIVd straight and thick.

Size: Holotype 220 mm long, 9 mm wide, 185 chaetigers, incomplete. Paratype series 23 to 80 mm long, 2 to 7 mm large, 37 to 113 chaetigers, all incomplete. One specimen (ZUEC 2974), number 27, complete, 75 mm long, 3 mm wide, 215 chaetigers. Widest specimen 175 mm long, 8 mm wide, 113 chaetigers.

Jaw apparatus ( Fig. 11): Colour light beige to dark brown; sclerotized plates darker, almost black in some specimens. Shaft of mandibles darker than maxillae. Calcareous cover white to yellowish. Inner callus of MI at an obtuse angle to its above portion (arrow). MI three times longer than plate of maxillary carrier (free portion of carrier sclerotized plate not included in measure). Prominent and generally blunt teeth of MII to MIV; the basal one, of MII and MIII, rounded. Right MII slightly larger than left one. Attachment lamella of MIII triangle shaped. Left MIV shorter than right MIV, being this one external base larger than internal base; inner arch of right MIV weakly pronounced. Internal base of right MIV almost straight. Both MIV with an inner callus near internal base and attachment lamella covering almost all outer edge. Rounded outer lateral edge of MV and‘L’-shaped inner edge. Maxillary formula: MI = 1 + 1, MII = 7 + 7–8, MIII = 7–8, MIV = 4–5 + 5–6, MV = 1 + 1. Mandibles (without calcareous cover) as long as MI + plate of maxillary carrier (without free portion of carrier sclerotized plate). Calcareous cover well developed, hard, well tied to cutting plate, projecting 1.5 times beyond base of inner cutting plate. Description based on paratype series .

Occurrence: Intertidal: States of Rio Grande do Norte (Natal, Ponta Negra Beach), Paraíba (João Pessoa, Pontas dos Seixos), Bahia (Tinharé Island, Morro de São Paulo, Gamboa and Third Beach), Espírito Santo (Aracruz, Coqueiral Beach). Intertidal to 5.3 m depth: São Paulo State (Ubatuba and Caraguatatuba cities).

Etymology: The name is given in honour of Marina Minucci Steiner, sister of Victoria Minucci Steiner and niece of Tatiana M. Steiner, one of the authors of this species.