Notodasus kristiani García-Garza, Hernández-Valdez & León-González, 2009

Magalhães, Wagner F. & Bailey-Brock, Julie H., 2012, Capitellidae Grube, 1862 (Annelida: Polychaeta) from the Hawaiian Islands with description of two new species, Zootaxa 3581, pp. 1-52 : 33-34

Notodasus kristiani García-Garza, Hernández-Valdez & León-González, 2009

Figures 24 A–D, 25 C–D

Notodasus kristiani García-Garza, Hernández-Valdez & León-González, 2009: 817 –818, figs 5a–d, 8e.

Material examined. Oahu Island: Waianae outfall, Sta. ZR3, 21°25ʹ22.9ʺ N, 158°11ʹ51.1ʺ W, 35 m, Jun/2011 (1 on SEM stub); Mamala Bay, Sand Island outfall, Sta. 42, Aug. 2003 (1, BPBM R3610).

Description. Two specimens collected incomplete, 17–28 mm long, 1.0–2.0 mm wide for about 56–77 chaetigers. Color in alcohol pale yellow.

Prostomium conical with palpode; eyespots about 20 on either side, not arranged in rows. Proboscis not observed. Peristomium achaetous and slightly longer than anterior thoracic segments.

Thorax with 11 chaetigers ( Fig. 24 A); tessellated to chaetiger 9, smooth posteriorly and biannulate with deep intra-segmental grooves ( Fig. 24 A). First chaetiger biramous and thorax with short bilimbate capillaries only ( Fig. 24 A). Notopodia inserted dorso-laterally and neuropodia laterally. Lateral organs present throughout, between noto- and neuropodia but closer to notopodia on thorax and closer to neuropodia on abdomen ( Fig. 24 C). Genital pores not observed.

Transition between thorax and abdomen marked by change in shape of segments ( Fig. 24 A, B); first two abdominal segments biannulate with capillaries only and enlarged notopodial and superior neuropodial lobes ( Fig. 24 B); subsequent abdominal segments multiannulated with hooded hooks throughout ( Fig. 24 C). Abdominal noto- and neuropodia with separated glandular tori pads ( Fig. 24 C). Notopodial glandular tori pads fused on first 2–3 abdominal chaetigers and in separate lines posteriorly ( Fig. 24 B). Notopodia with about 25 hooded hooks per fascicle, neuropodia with about 80 hooks. Noto- and neuropodial hooks similar; hoods not extending beyond main fang ( Fig. 24 D). Hooks with long anterior shaft, bulbous node and multiple teeth; at least 4 rows above main fang with increasing number of teeth to about 10 on superior row. ( Fig. 24 D).

Branchiae not observed and reported to begin from chaetiger 51 in the original description.

Methyl green staining pattern. Thorax and first two abdominal segments stain darker than the following eight abdominal segments which have two darkly staining transverse bands separated by the unstained notopodial lobes and lateral organs ( Fig. 25 C); remaining abdominal segments stain lightly on dorsum ( Fig. 25 C, D).

Distribution. The type locality for this species is Varadero Beach, Guaymas Bay (Gulf of California) but it was also recorded from western coast of Baja California ( García-Garza et al. 2009) and it is reported for the first time in Oahu, Hawaii.

Remarks. The specimens found agree very well with the original description but differ in the extent to which the MG dorsal bands are present in the abdominal segments; about three chaetigers in the original description and eight chaetigers in the Hawaiian material ( Fig. 25 C, D). The posterior abdominal segments have similar bands but are more lightly stained ( Fig. 25 D). Branchiae were not found although the specimen was incomplete and the original description states branchiae are present from chaetiger 51.

Figures

FIGURE 24. SEM of Notodasus kristiani: A, anterior end in dorsal view; B, transition between thoracic and abdominal segments; C, abdominal segments in dorso-lateral view showing lateral organs; D, abdominal hooded hooks.

FIGURE 25. Notodasus harrisae: A, MGSP of thorax and anterior abdominal segments; B, MGSP of anterior abdominal segments. Notodasus kristiani: C, MGSP of end of thorax and anterior abdominal segments; D, MGSP of abdominal segments.