Leitoscoloplos pugettensis (Dean, Harlan K. & Blake, James A. 2015)
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Familia: Orbiniidae
Genus: Leitoscoloplos
Name
Leitoscoloplos pugettensis Pettibone, 1957 – Wikispecies link – Pensoft Profile
- Leitoscoloplos pugettensis Dean, Harlan K., 2015, Zootaxa 3956: 187-188.
Materials Examined
Material examined. Gulf of Nicoya: Sta. 22, 9 ° 48 ˊ 25 ″N, 84 ° 52 ˊ 40 ″W, 22 m, muddy sand, 11 Jul 1980 (2), 1 Oct 1980, 1 (MZUCR); Sta. 24, 9 ° 49 ˊ 25 ″N, 84 ° 41 ˊ 20 ″W, 11 m, sand, 1 Oct 1980, 4 (MCZ83994), 8 Jun 1981 (9); 4 Aug 1981, 3 (MZUCR): Sta. 28, 9 ° 52 ˊ 16 ″N, 84 ° 45 ˊ 30 "W, 26 m, mud, 4 Aug 1981 (2): Sta. 29, 9 ° 54 ˊ 55 ″N, 84 ° 45 ˊ 15 ″W, 18 m, muddy sand, 1 Oct 1980 (1); 1 Apr 1982, 1 (MCZ70322), 1 (MCZ85626), 2 (MCZ85695); Sta. 30, 9 ° 54 ˊ 40 ″N, 84 ° 45 ˊ 50 ″W, 18 m, muddy sand, 27 Jan 1980 (1). Punta Morales, Playa Blanca, 10 °04ˊN, 84 ° 58 'W, lower intertidal, muddy sand, col: J. A. Vargas, 1986 (1); col: H.K. Dean, 20 Dec 1986 (31). Guanacaste, Bahia Culebra: Sta. 5, 10 º 35 ˊ25.2″N, 85 º 39 ˊ31.1″W, 2 m, 19 May 2011 (1); Sta. 9, 10 º 35 ˊ30.0″N, 85 º 39 ˊ43.4″W, 5 m, 19 May 2011 (11). Golfo Dulce, intertidal, 1996, (1), col: H. Buttner.
Description
Description. Complete specimens 12.6, 15.7, and 18.5 mm long; 0.52, 0.54 and 0.45 mm. maximum thoracic width, respectively; incomplete specimens from 0.15–1.25 mm maximum thoracic width (Fig. 2 C). Prostomium short, conical; eyespots lacking; paired dorsolateral nuchal organs present. Peristomium short, one-half prostomial length, subequal to setiger one. Thorax with 12–17 setigers, flattened dorso-ventrally. Branchiae from penultimate thoracic segment, occasionally in last thoracic segment of smaller individuals. Thoracic notopodia with triangular postsetal lobe, larger in posterior thoracic setigers; neuropodial postsetal lobe short, digitate, larger in posterior thoracic segments (Fig. 6 A). Abdominal notopodial postsetal lobes subtriangular in mid-body segments, shorter than branchiae (Fig. 2 D), becoming more lanceolate and subequal to branchiae posteriorly (Fig. 2 E); neuropodial postsetal lobes foliose, bifurcate, medial arm twice length of lateral branch, with well-developed subpodial flange (Fig. 2 D, E). Camerated capillary setae present throughout thoracic setigers and abdominal neuropodia, with an additional flail setae (Fig. 6 B) accompanying camerated capillaries in abdominal notopodia. Pygidium with long paired dorso-lateral anal cirri.
Discussion
Remarks.Leitoscoloplos pugettensis was described by Pettibone (1957) from Puget Sound in Washington State from mud and gravelly sand. She synonymized Haploscoloplos elongatus (Johnson, 1901), also described from Puget Sound, and later reported from British Columbia, Canada, California and Pacific Panama. The variability in thoracic length of this species may be correlated with the body size of Costa Rican specimens. Mackie (1987) reported 19–20 thoracic setigers in specimens from Washington State and 19–22 in specimens from British Columbia while Blake (1996) reported thorax lengths of 14–20 in California specimens. Mackie (1987) examined paratypes of this species from Puget Sound and found branchiae first occurred as small papillae on setigers 13–15 in specimens with 19–22 thoracic setigers. Pettibone (1957) reported the branchiae from setigers 15–18 in specimens with 19–22 setigers. Blake’s (1996) California specimens were of a greater size range, with branchiae from setigers 14–20 with the onset of branchiae from the one or two most posterior thoracic segments. Costa Rican specimens agree with Blake’s California material in that the branchiae are almost always present from the last two thoracic segments.
Distribution
Distribution. Eastern Pacific Ocean from Alaska to Costa Rica, intertidal to 220 m. Found in muddy to sandy sediments from 11‒ 22 m. in the Gulf of Nicoya and 1.5‒ 5 m in Bahia Culebra.
Taxon Treatment
- Dean, Harlan K.; Blake, James A.; 2015: The Orbiniidae (Annelida: Polychaeta) of Pacific Costa Rica, Zootaxa 3956: 187-188. doi
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