Scyphoproctus edmondsoni, Magalhães, Wagner F. & Bailey-Brock, Julie H., 2012

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 : 42-43

publication ID

https://doi.org/ 10.5281/zenodo.215310

publication LSID

lsid:zoobank.org:pub:07C06068-9160-4AB4-AAF4-0451679D9F13

DOI

https://doi.org/10.5281/zenodo.6175631

persistent identifier

https://treatment.plazi.org/id/03913362-FFA6-FFA3-99BE-FB9799E84AFA

treatment provided by

Plazi

scientific name

Scyphoproctus edmondsoni
status

sp. nov.

Scyphoproctus edmondsoni View in CoL sp. nov.

Figures 31 View FIGURE 31 A–C, 32 A–E, 33 A

Material examined. Holotype: Oahu Island: Nuupia Pond, 21°25ʹ58.8ʺ N, 157°44ʹ52.8ʺ W, Environmental Monitoring and Assessment Program ( EMAP), State of Hawaii estuaries and bays, Oct. 2002, Sta. 20 ( USNM 1191161); Paratypes: same Sta. and date as holotype (20, USNM 1191162; 20, BPBM R3625).

Non– type material examined: Pearl Harbor, Middle Loch, on hull of U.S. S. ‘Machinist’ Floating Dry Dock, 27 Mar. 1996, 5 m, coll. R.C. DeFelice (1, BPBM R2318).

Description. Holotype 10 mm long, 0.4 mm wide for 59 chaetigers. Complete paratypes 2–11.5 mm long, 0.1–0.5 mm wide for 29–58 chaetigers. Body elongate, slender, widest on mid-thoracic chaetigers. Color in alcohol pale yellow.

Prostomium rounded anteriorly, inflated ( Figs 31 View FIGURE 31 A, B, 32A, B); nuchal organs not observed; eyespots present as a pair of oval postero-lateral densely pigmented areas ( Fig. 31 View FIGURE 31 B). Proboscis finely papillated ( Fig. 32 View FIGURE 32 B). Peristomium achaetous, 1.5 longer than anterior thoracic segments ( Figs 31 View FIGURE 31 A, 32A, B).

Thorax with 10–11 segments, including one achaetous segment (not the peristomium) and 9–10 chaetigers ( Figs 31 View FIGURE 31 A, 32A). Thorax glandular, segments distinctly biannulate after chaetiger 5 with deep inter-segmental grooves and bilimbate capillaries ( Fig. 32 View FIGURE 32 A); shallow inter-segmental groove transversing peristomium, achaetous segment and chaetigers 1–2 ( Fig. 32 View FIGURE 32 B). First chaetiger biramous. Parapodial lobes well separated; notopodia inserted dorso-laterally and neuropodia laterally. Lateral organs present throughout, between noto- and neuropodia, closer to notopodia, easily observed after chaetiger 8. Genital pores not observed.

Transition between thorax and abdomen marked by change in shape of segments and chaetae ( Figs 31 View FIGURE 31 A, 32A); abdominal segments multiannulated with hooded hooks throughout. Abdominal noto- and neuropodia with well separated glandular tori pads positioned anteriorly ( Figs 31 View FIGURE 31 A, 32A). Anterior noto- and neuropodia with 10–12 hooks per fascicle, reducing to two notopodial hooks and 4–5 neuropodial hooks in far posterior. Abdominal hooks with short hoods, not extending beyond main fang ( Fig. 32 View FIGURE 32 D, E). Hooks with multiple teeth, in frontal view with 3–4 rows; 3–4 in basal row, 4–5 in superior rows ( Fig. 32 View FIGURE 32 D, E). One pre-pygidial segment with notopodial spines and neuropodial hooks. Additional segment incomplete, with two acicular hooks per notopodial lobe. Two inflated, heart-shaped anal cirri ( Figs 31 View FIGURE 31 C, 32C). Branchiae absent.

Methyl green staining pattern. Anterior end and thoracic region stain uniformly light green ( Fig. 33 View FIGURE 33 A), darker on posterior half of thorax ( Fig. 33 View FIGURE 33 A). First two abdominal segments stain on the anterior and posterior halves of segments, leaving intra–segmental grooves and parapodial tori unstained; following abdominal segments stain only as a posterior band on each segment ( Fig. 33 View FIGURE 33 A); posterior third of the body and pygidium stain uniformly green.

Distribution. Only known from Oahu, Hawaii.

Remarks. This new species differs from the other two species previously assigned to Pulliella , Scyphoproctus armata comb. nov., (Fauvel, 1929) and Scyphoproctus pseudoarmata ( Silva, 1965) comb. nov., by the number of thoracic segments, number of pre-pygidial segments with notoacicular spines and the shape of the anal cirri. For instance, S. armata comb. nov. has nine thoracic chaetigers with only capillaries, S. pseudoarmata has 12–13 and S. edmondsoni sp. nov., has 9–10. The number of pre-pygidial segments with notospines and neurohooks in S. armata comb. nov. is 8–11, in S. pseudoarmata comb. nov., it is 6–8 and in S. edmondsoni sp. nov., only one pre-pygidial segment has notospines and neurohooks. Anal cirri are digitate in S. armata comb. nov., filiform in S. pseudoarmata comb. nov., and inflated in S. edmondsoni sp. nov. Eyespots have not been reported in S. pseudoarmata , but these may be hidden below the peristomium.

The modified pygidium in all 56 specimens of S. edmondsoni sp. nov., had one of two stages in the posterior end: 1) pygidium forming a globular and glandular mass without distinct segments or chaetae or 2) pygidium with two distinct and inflated anal cirri and two fused segments not forming a distinct anal plate.

Etymology. This species is named after Dr. Charles Edmondson, a pioneer in studying Hawaiian marine invertebrates whose publications, especially the book entitled “The Reef and Shore Fauna of Hawaii” ( Edmondson 1933; 1946), have inspired and guided most of the current researchers.

USNM

Smithsonian Institution, National Museum of Natural History

BPBM

Bishop Museum

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