Nereis alacranensis, a new species of polychaete (Annelida, Nereididae) from Alacranes Reef, southern Gulf of Mexico, with a key to Nereis from the Grand Caribbean Author Ramírez-Hernández, Adriana Author Hernández-Alcántara, Pablo Author Solís-Weiss, Vivianne text Zootaxa 2015 4012 1 156 166 journal article 40052 10.11646/zootaxa.4012.1.8 ed442728-f6bd-483f-851f-9b9454405ae9 1175-5326 236496 361EA0FD-D34A-4657-A1BE-9F49150599AA

TABLE 1. Comparison of Nereis species with few paragnaths and short blades in the notopodial homogomph falcigers.

Morphological structures	N. anoculopsis Fauchald, 1972	N. baolingi de León- González & Solís-Weiss, 2000	N. eugeniae (Kinberg, 1866)	N. grayi Pettibone, 1956	N. cirriseta Hutchings & Turvey,1982	N. alacranensis n. sp.
Area I	0	0	0	0	0	0
Area II	4 cones in transverse row	2 cones	9–11 cones in two rows	2–3 small cones	2–7 cones in 1 or 2 oblique rows	3–5 cones in diagonal row
Area III	0	0	absent or 2–6 small cones in irregular row	0	0, rarely 1 small cone	0
Area IV	4 cones in group	2 cones	absent or grouped (0–18)	10–13 cones in triangular group	4–10 cones irregularly in oblique crescent	5–8 cones in curved row
Area V	0	0	0–1	0	0	0
Area VI	0	0	3–6 cones in small group	3–4 small cones	3–6 cones in oval group or transverse row	3–7 cones in irregular arrangement
Area VII–VIII	2 cones in transverse row	7 cones in transverse row	0–11 cones sparse in irregular row	0	4–7 cones in transverse row	7 cones in transverse row
Blades of notopodial homogomph falcigers	Short, with 6–7 thick teeth; similar along body	Short with 3–4 short teeth; similar along body	Short and smooth; similar along body	Short and smooth; similar along body	Short with several small bristle-like teeth; posterior falcigers with clearly elongate blades	Short with up to 7 short teeth; similar along body
Tentacular cirri	Short (chaetiger 4)	Short (chaetiger 2)	Short (chaetiger 2)	Long (chaetiger 8)	Short (chaetiger 3)	Short (chaetiger 3)
Habitat	On soft sediments; 1,632 m	On rocky ledges and shingle; intertidal		On soft sediments; intertidal to160 m	On rocks; intertidal and sublittoral to10 m	On dead coral rocks, associated with sponges and seagrasses; intertidal
Distribution	Mexican Pacific	Mexican Pacific	Strait of Magellan, Chile; Falkland Islands; Kerguelen Islands; South Africa	Northwest Atlantic, Gulf of Mexico	West and South Australia	Southern Gulf of Mexico