Geminofilum garciaalvarezi (Moreira, Cacabelos & Troncoso, 2004) Moreira, Cacabelos & Troncoso, 2004

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 : 35-37

Geminofilum garciaalvarezi (Moreira, Cacabelos & Troncoso, 2004) comb. n. Figs 4Q, R, 5H, 13 G–I

Sphaerodoropsis garciaalvarezi Moreira, Cacabelos & Troncoso, 2004: 995-999, figs 1-3, 4A, D.

Type locality.

Ensenada de Baiona, NW Iberian Peninsula, 42°08.83'N, 8°50.25'W, 7 m.

Material examined.

(2 specs) NW Spain: MNCN 16.01/18460 (2 specs, on SEM stub), Ría de Ferrol, 08°14.37'N, 43°27.88'W, 15 m, 19 Jul 2010.

Diagnosis.

Body short and cylindrical, up to 2.5 mm long. Head appendages short, smooth, lacking spurs or basal papillae. Median antenna shorter than lateral antennae and palps. Antenniform papillae absent. Dorsal macrotubercles sessile, almost spherical, arranged in two transverse rows per segment, with six and seven macrotubercles each in midbody segments. Additional five papillae, hemispherical and small, per segment. Ventrum with six papillae per segment, hemispherical and small, arranged in a V-shape. Parapodia with one papilla on anterior surface. Acicular lobe from chaetiger 2, digitiform. Ventral cirri digitiform reaching acicular lobe tip. Compound chaetae (3-6) with short blades (up to five times as long as wide); all similar. Females with large tubercle near ventral edge of parapodia of chaetiger 6 and inflated ventral cirri of chaetigers 4-7. Males with a pair of oval tubercles, ventral cirri of chaetiger 6 also basally inflated.

Remarks.

The recent description of this species is complete and re-examination of material, even under the SEM did not provide further information about morphological features. Range of variation among chaetae of different specimens and segments show moderate variation and all studied blades range between 3-5 times as long as wide, are unidentate, and finely serrated (Fig. 13 G–I). Geminofilum garciaalvarezi  comb. n. is similar to G. bisphaeroserialis ( Hartmann-Schröder, 1974), comb. n. (South Africa), G. arctowskyensis ( Hartmann-Schröder & Rosenfeldt, 1988), comb. n. (Antarctica), and G. halldori (Moreira & Parapar, 2012), comb. n. (Iceland) but they can be distinguished according to the number and arrangement of ventral papillae ( Moreira et al. 2004, Moreira and Parapar 2012).

Distribution.

NW Iberian Peninsula ( Moreira et al. 2004, Cacabelos et al. 2008).

Habitat.

From gravel to muddy sand and sandy mud and seagrass ( Zostera marina L.), 7-28 m depth ( Moreira et al. 2004, Cacabelos et al. 2008).