Leitoscoloplos pugettensis ( Pettibone, 1957 )

Dean, Harlan K. & Blake, James A., 2015, The Orbiniidae (Annelida: Polychaeta) of Pacific Costa Rica, Zootaxa 3956 (2), pp. 183-198 : 187-188

publication ID	https://doi.org/10.11646/zootaxa.3956.2.2
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DOI	https://doi.org/10.5281/zenodo.6115428
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scientific name	Leitoscoloplos pugettensis ( Pettibone, 1957 )
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Leitoscoloplos pugettensis ( Pettibone, 1957) View in CoL

Figures 2 View FIGURE 2 (C–E), 6 (A–B)

Scoloplos elongata Johnson 1901: 412 View in CoL –413, P1. 10, Figs. 105–110.

Haploscoloplos elongata: Hartman, 1944: 257 View in CoL ; 1948: 30; 1955:174.

Haploscoloplos elongatus: Hartman, 1957: 273 View in CoL –275, pl. 26, Figs. 1 View FIGURE 1 –11; 1960: 107–108; 1961: 265; 1963: 36; 1969: 19–22, Figs. 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 .— Fauchald, 1972: 166.— Vargas et al., 1985: 336.— Maurer et al. 1988: 47.— Molina-Lara & Vargas Zamora, 1995: 198.— Dean, 1996a: 74. Not Imajima & Hartman, 1964.

Scoloplos (Scoloplos) pugettensis Pettibone, 1957: 163 View in CoL .

Leitoscoloplos pugettensis: Blake, 1980:1 View in CoL ‒18, Figs. 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 ; 1996:9‒10, Fig. 1.2.— Hobson & Banse, 1981:28.— Mackie, 1987:8 ‒9, Fig. 8.— Hernández-Alcantara & Solis-Weiss, 1993:1029.—de León-González & Rodriguez, 1996:172.

Scoloplos acmeceps: Vargas et al. 1985:336 View in CoL .—Dean, 2009:146. Not Chamberlin, 1919.

Material examined. Gulf of Nicoya: Sta. 22, 9°48ˊ25″N, 84°52ˊ40″W, 22 m, muddy sand, 11 Jul 1980 (2), 1 Oct 1980, 1 ( MZUCR); Sta. 24, 9°49ˊ25″N, 84°41ˊ20″W, 11 m, sand, 1 Oct 1980, 4 ( MCZ 83994), 8 Jun 1981 (9); 4 Aug 1981, 3 ( MZUCR): Sta. 28, 9°52ˊ16″N, 84°45ˊ30"W, 26 m, mud, 4 Aug 1981 (2): Sta. 29, 9°54ˊ55″N, 84°45ˊ15″W, 18 m, muddy sand, 1 Oct 1980 (1); 1 Apr 1982, 1 ( MCZ 70322), 1 ( MCZ 85626), 2 ( MCZ 85695); Sta. 30, 9°54ˊ40″N, 84°45ˊ50″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, 10º35ˊ25.2″N, 85º39ˊ31.1″W, 2 m, 19 May 2011 (1); Sta. 9, 10º35ˊ30.0″N, 85º39ˊ43.4″W, 5 m, 19 May 2011 (11). Golfo Dulce, intertidal, 1996, (1), col: H. Buttner.

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 View FIGURE 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 View FIGURE 6 A). Abdominal notopodial postsetal lobes subtriangular in mid-body segments, shorter than branchiae ( Fig. 2 View FIGURE 2 D), becoming more lanceolate and subequal to branchiae posteriorly ( Fig. 2 View FIGURE 2 E); neuropodial postsetal lobes foliose, bifurcate, medial arm twice length of lateral branch, with well-developed subpodial flange ( Fig. 2 View FIGURE 2 D, E).

Camerated capillary setae present throughout thoracic setigers and abdominal neuropodia, with an additional flail setae ( Fig. 6 View FIGURE 6 B) accompanying camerated capillaries in abdominal notopodia.

Pygidium with long paired dorso-lateral anal cirri.

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.

L. pugettensis View in CoL is similar to L. chilensis ( Hartmann-Schröder, 1965) View in CoL which is redescribed by Mackie (1987) as having a maximum of 15–16 thoracic setigers, thoracic branchiae, and morphologically similar abdominal notopodial and neuropodial lamellae. It differs from L. chilensis View in CoL in the more triangular neuropodial postsetal lobes in the thorax and the shape of the branchiae which are medially expanded in L. chilensis View in CoL . Flail setae have not been previously reported for L. pugettensis View in CoL .

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.

References

Blake, J. A. (1980) Larval development of Polychaeta from the northern California coast. IV. Leitoscoloplos pugettensis and Scoloplos acmeceps (Family Orbiniidae). Ophelia, 19, 1 - 18. http: // dx. doi. org / 10.1080 / 00785326.1980.10425502

Blake, J. A. (1996) Family Orbiniidae Hartman, 1942. In: Blake, J. A., Hilbig, B. & Scott, P. H. (Eds.), Taxonomic Atlas of the benthic fauna of the Santa Maria Basin and the Western Santa Barbara Channel, Volume 6. The Annelida, Part 3. Santa Barbara Museum of Natural History, Santa Barbara, California, pp. 1 - 26.

Chamberlin, R. V. (1919) Pacific coast Polychaeta collected by Alexander Agassiz. Bulletin of the Museum of Comparative Zoology, 63, 251 - 270.

Dean, H. K. (1996 a) Subtidal benthic polychaetes (Annelida) of the Gulf of Nicoya, Costa Rica. Revista Biologia Tropical, 44 (Supplement 3), 69 - 80.

Fauchald, K. (1972) Benthic polychaetous annelids from deep water off western Mexico and adjacent areas in the Eastern Pacific Ocean. Allan Hancock Monographs in Marine Biology, 7, 1 - 575.

Hartman, O. (1944) Polychaetous annelids from California, including the descriptions of two new genera and nine new species. Allan Hancock Pacific Expeditions, 10, 239 - 310.

Hartman, O. (1957) Orbiniidae, Apistobranchidae, Paraonidae and Longosomidae. Allan Hancock Pacific Expeditions, 15, 211 - 393.

Hartmann-Schroder, G. (1965) Zur kenntnis des sublitoals der chilenischen kuste unter besonder berucksichtigung der polychaeten und ostracoden. Teil II. Die polychaeten des sublitorals. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 62, 59 - 305.

Hernandez-Alcantara, P. & Solis-Weiss, V. (1993) New records of sedentariate polychaetous annelids from the continental shelf of the Gulf of California. Bulletin of Marine Science, 53, 1027 - 1041.

Hobson, K. D. & Banse, K. (1981) Sedentariate and archiannelid polychaetes of British Columbia and Washington. Canadian Bulletin of Fisheries and Aquatic Sciences, 209, 1 - 144.

Imajima, M. & Hartman, O. (1964) The polychaetous annelids of Japan. Allan Hancock Foundation Occasional Paper, 26, 1 - 452.

de Leon-Gonzalez, J. A. & Rodriguez, J. A. (1996) Orbiniidae (Polychaeta) from soft bottom of the western coast of Baja California Peninsula, Mexico. Bulletin of Marine Science, 59, 169 - 174.

Mackie, A. S. Y. (1987) A review of species currently assigned to the genus Leitoscoloplos Day, 1977 (Polychaeta: Orbiniidae), with descriptions of species newly referred to Scoloplos Blainville, 1828. Sarsia, 72, 1 - 28.

Maurer, D., Vargas, J. & Dean, H. (1988) Polychaetous Annelids from the Gulf of Nicoya, Costa Rica. Internationale Revue der Gesamten Hydrobiologie, 73 (1), 43 - 59. http: // dx. doi. org / 10.1002 / iroh. 19880730105

Molina-Lara, O. A. & Vargas Zamora, J. A. (1995) Poliquetos (Annelida: Polychaeta) del estero d Jaltepeque, El Salvador una comparacion 1959 - 1991. Revista de Biologia Tropical, 43, 195 - 205.

Pettibone, M. H. (1957) North American genera of the family Orbiniidae. Journal of the Washington Academy of Sciences, 47, 159 - 167.

Vargas, J. A., Dean, H. K., Maurer, D. & Orellana, P. (1985) Lista preliminar de invertebrados asociadoa a los sedimentos del Golfo de Nicoya, Costa Rica. Brenesia, 24, 327 - 341.

Figures

FIGURE 1. Leitoscoloplos multipapillatus: A, Posterior thoracic parapodium, posterior view; B, Station 29, Gulf of Nicoya specimen, thoracic setiger, anterior view; C, Station 1, Bahia Culebra specimen, posterior end and pygidium. Leitoscoloplos panamensis: D, Station 29, Gulf of Nicoya specimen, thoracic setiger, anterior view; E, Station 29, Gulf of Nicoya specimen, anterior abdominal setiger, anterior view; F, Station 28 Jun, Gulf of Nicoya specimen, posterior abdominal setiger, anterior view. Scale bars: A ‒ F = 100 µm. br = branchiae, ic = interramal cirri, neL = neuropodial lamellae, noL = notopodial lamellae, p = prostomium, per = peristomium, sp = subpodial papillae, vc = ventral cirri.

FIGURE 2. Leitoscoloplos multipapillatus: A, Anterior end, lateral view. Leitoscoloplos panamensis: B, Station 29, Gulf of Nicoya specimen, anterior end, lateral view. Leitoscoloplos pugettensis: C, Station 22, Gulf of Nicoya specimen, anterior end, lateral view; D, Station 9, Bahia Culebra specimen, midbody abdominal setiger, anterior view; E, Station 9, Bahia Culebra specimen, posterior abdominal setiger, posterior view. Leodamas hamatus n. sp.: F, Holotype, posterior thoracic setiger, anterior view; G, Holotype, Posterior notopodial emergent hook. Scale bars: A, C = 1000 µm, B = 500 µm, D, E = 100 µm, F = 50 µm G = 10 µm.

FIGURE 6. Leitoscoloplos pugettensis: A, Station 9, Bahia Culebra specimen, thoracic setiger, anterior view; B, Station 9, Bahia Culebra specimen, posterior notopodial flail setae. Leodamas treadwelli: C, Station 28 Jun, Gulf of Nicoya specimen, posterior abdominal setiger, anterior view; Scoloplos cryptospinigerus n. sp.: D, Holotype, anterior end, dorsal view; E, Holotype, thoracic parapodia, posterior view; F, Paratype, abdominal parapodia, anterior view; G, Paraytpe, thoracic neurosetal spines. Scale bars: A, F = 50 µm, B = 10 µm, C, E = 100 µm, D = 500 µm, G = 20 µm.