Euritmia hamulisetosa Sarda-Borroy , 1987

Capa, Maria, Nygren, Arne, Parapar, Julio, Bakken, Torkild, Meissner, Karin & Moreira, Juan, 2019, Systematic re-structure and new species of Sphaerodoridae (Annelida) after morphological revision and molecular phylogenetic analyses of the North East Atlantic fauna, ZooKeys 845, pp. 1-97 : 25-26

Euritmia hamulisetosa Sarda-Borroy, 1987 Figs 4G, H, 5D

Euritmia hamulisetosa Sardá-Borroy, 1987: 48-49, fig. 1, 2; Moreira 2012: 41-43, fig. 12F, 14.

Type locality.

Cádiz, South of Iberian Peninsula, 0.5-10 m.

Diagnosis.

Body short and ellipsoid, up to 0.6 mm long. Head with short appendages, without spurs or basal papillae; antenniform papillae absent. Epithelial papillae sessile, spherical, arranged in four transverse rows per segment. Ventrum with a pair of papillae near the parapodial bases and two additional longitudinal rows. Ventral papillae, in four transverse rows per segment. Microtubercles (small tubercles with a collar and terminal papillae) absent. Parapodia with a large dorsal papilla, digitiform acicular lobe, and spherical ventral cirrus. Stout hooks in anterior chaetigers absent. Six simple chaetae with serrated edge, enlarged subdistally, with a distal spine and filament in opposite directions.

Material examined.

No specimens were available for this study.

Remarks.

In the original description, the dorsal epithelial tubercles were termed macrotubercles ( Sardá-Borroy 1987). These have later been interpreted as papillae due to their size and arrangement in comparison to other sphaerodorids (e.g., Capa et al. 2016b). The parapodia were originally described with double parapodial lobes and a small globular cirrus ( Sardá-Borroy 1987). These were interpreted differently as it was clear the large lobes represent the acicular lobe and ventral cirrus, and ventral papillae placed at the base of parapodia (Fig. 5D; Capa et al. 2014).

Euritmia hamulisetosa is distinguished from other congeners by the unique combination of two features: the arrangement of dorsal papillae in four transverse rows per segment (Fig. 4G) and the presence of parapodial papillae on the anterior and posterior surfaces (Fig. 5D). Euritmia capense (Day, 1963) bears two transverse rows of papillae per segment and five parapodial papillae (one dorsal, one ventral and three smaller ones on anterior and posterior parapodial surfaces). Euritmia bipapillata (Kudenov, 1987) has three transverse rows of dorsal papillae and one papilla on anterior surface of parapodia; Euritmia carolensis (Capa, Osborn & Bakken, 2016) has three transverse rows of papillae and no parapodial papillae ( Capa et al. 2016b). Euritmia nordica sp. n. bears three transverse rows per segment (with a characteristic longitudinal mid-dorsal bare area) and no papillae on parapodia (present study).

Distribution.

Gibraltar Strait and Mediterranean coast of the Iberian Peninsula ( Sardá-Borroy 1987, Moreira 2012).

Habitat.

Littoral algae and dentritic bottoms to 10 m ( Moreira 2012).