Notodasus oraria (McCammon & Stull, 1978) McCammon & Stull, 1978

Garcia-Garza, Maria E., Leon-Gonzalez, Jesus A. de & Harris, Leslie H., 2017, Relocation of Dodecaseta McCammon & Stull, 1978 (Annelida, Capitellidae) in Notodasus Fauchald, 1972, ZooKeys 715, pp. 93-101 : 95

Notodasus oraria (McCammon & Stull, 1978) comb. n. Figure 1

Dodecaseta oraria Mc Cammon & Stull, 1978: 41-43, figs 1-3.

Notodasus kristiani García-Garza et al., 2009: 809-823, figs 5 A–D, 8E; García-Garza and de León-González 2011: 17-52; Magalhães and Bailey-Brock 2012: 33, figs 24 a–d, 25 c–d.

Material examined.

Type material Dodecaseta oraria Holotype (LACM-AHF POLY 1248); Paratype (LACM-AHF POLY 1250), Palos Verdes Península, California, USA, 30-180 m; Notodasus kristiani Holotype (UANL 6515), Varadero beach, Guaymas, Sonora, Mexico [27°54'04.3"N, 110°52'07.7"W], 1 m, July 01 2005, 20 Paratypes (UANL 6517), 2 Paratypes (LACM-AHF POLY 2213), 1 Paratype (MNNH 1508), 1 Paratype (ZMH POL), Varadero beach, Guaymas, Sonora, [27°54'04.3"N, 110°52'07.7"W], 1 m, July 01 2005, coll. J.A. de León-González (JALG) and M.E. García-Garza (MEG-G).

Additional material examined.

Notodasus kristiani , two specimens (ECOSUR), Municipal beach, Los Angeles Bay, Baja California, Mexico [28°56'32.3"N, 113°33'57.2"W] 1 m, May 24 1986, coll. P. Sánchez and E. Espinosa. One specimen (UANL 6515), Estero Rancho Nuevo, Santa Marina Bay, Baja California Sur, [24°19'15"N, 111°25'05"W] 3 m, June 21 1998, coll. JALG.

Redescription.

Holotype of D. oraria incomplete with 89 segments, 12 mm long, 0.8 mm wide in abdomen. Color in alcohol white-translucent. Prostomium conical with palpode. Eyespots not seen. Peristomium to the eighth thoracic chaetiger tessellated, remaining segments smooth. Thorax with 11 chaetigers, with bilimbate capillaries in both rami, first chaetiger biramous, transition between thorax and abdominal segments marked by abrupt shorting of abdominal segments. (Fig. 1A). Thoracic and abdominal segments biannulate. Notopodia lateral in first thoracic segments, in subsequent segments located dorsally. Lateral organs, between notopodia and neuropodia throughout body, those of thoracic region closer to notopodium; thoracic lateral organs larger than abdominals. Genital pores not seen. Notopodial lobes of abdominal chaetigers 3-7 fused dorsally (Fig. 1B, F), each line of hooded hooks completely separated, with around 18-20 hooks per fascicle. Neuropodial lobes project to dorsal region and separate ventrally, with chaetal fascicles with about 77-80 hooded hooks (Fig. 1A, C). Notopodial and neuropodial abdominal hooded hooks similar along body, with long anterior shaft, bulbous node, indistinct constriction, developed shoulder, short hood, posterior shaft longer than anterior one. Four rows of teeth above triangular main fang, basal row with five teeth, middle basal row with seven, middle apical row with nine and distal row with two teeth (Fig. 1D). Branchiae emerge from a ventral pore. Pygidium not seen.

Methyl green staining pattern. Peristomium and first 6 segments without staining apparently, post-chaetal part of segment 7, segments 8 to 10 and pre-chaetal part of segment 11 moderately stained, and segments 12 and 13 dark green (Fig. 1A, E).

Habitat.

Mud with high content of organic matter (Varadero beach), in soft sediments retained into Nastier boxes (Santa Marina bay), and mud pockets between Mytilus edulis beds (Los Angeles Bay, Municipal beach).

Distribution.

USA: Southern California Bight, Waianae outfall and Mamala Bay, Sand Island outfall, Hawaii; Mexico: Gulf of California and western coast of Baja California.

Remarks.

Type material of Dodecaseta oraria was examined and compared with type material of Notodasus kristiani , and we found similar morphological characters in both species: lateral notopodia in the first thoracic segments, in subsequent segments located dorsally; abdominal notopodial lobes fused dorsally (Fig. 1B, F); neuropodial lobes expanded to the dorsal side (Fig. 1 A–B, E–F) and separated ventrally (Fig. 1C, G).

Based on examining type material of both species, we conclude that the specimens identified as D. oraria were juveniles exhibiting variation in chaetal counts, leading to a mis-identification. We conclude therefore, that Dodecaseta oraria is a junior synonym of Notodasus kristiani .