Leodamas tribulosus Ehlers 1897
Leodamas tribulosus (Ehlers, 1897) Figures 36–37 Aricia tribulosa Ehlers, 1897: 91, pl. 6, figs. 141–147; 1901: 166; Fauvel 1907: 19. Scoloplos ( Scoloplos ) tribulosus : Mesnil & Caullery 1898: 142. Scoloplos tribulosus : Fauvel 1941: 286. Scoloplos ( Leodamas ) tribulosus : Hartman 1957: 290;...
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2017
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Online Access: | https://dx.doi.org/10.5281/zenodo.4901789 https://zenodo.org/record/4901789 |
Summary: | Leodamas tribulosus (Ehlers, 1897) Figures 36–37 Aricia tribulosa Ehlers, 1897: 91, pl. 6, figs. 141–147; 1901: 166; Fauvel 1907: 19. Scoloplos ( Scoloplos ) tribulosus : Mesnil & Caullery 1898: 142. Scoloplos tribulosus : Fauvel 1941: 286. Scoloplos ( Leodamas ) tribulosus : Hartman 1957: 290; 1966: 13, pl. 3, figs. 1–2; Hartmann-Schröder 1962b: 129 –130, figs. 151–153; 1965: 192; Rozbaczylo, 1985: 132. Scoloplos armiger trioculata Hartmann-Schröder, 1962b: 134 –135, figs. 88–89. New Synonymy. Protoariciella uncinata : Elias, Vallarino & Bremec 2000: 181 –184. Not Hartmann-Schröder 1962b. Leodamas tribulosus : Bleidorn et al . 2009: 57 –69 (molecular phylogeny). Material examined. Argentina, Mar del Plata, intertidal, Feb 1970, coll. J.M. Orensanz (1 juvenile, JAB); Santa Clara, mussel beds, coll. R. Elias, 12 Jan 2001, (3, MCZ 135298); Golfo San Matías, Las Chañares, intertidal, Feb 1972, Coll. J.M. Orensanz (2, USNM 1013664); South of Isla Colorado, intertidal, Jan 1973, coll. J.M. Orensanz (7, USNM 1013667); Puerto Lobos Beach, intertidal, 21 Jan 1973, coll. J.M. Orensanz (1, USNM 1013666); IBM Sta. SAO-IV-1133, intertidal (5, 1013665).— Tierra del Fuego, Hero Sta. 71-2-8, intertidal (1, USNM 69384); Staten Island, off Tierra del Fuego, Hero Sta. 71-2-21, intertidal (1, USNM 60686).— Chile, Valparaiso Province, Viña del Mar, Montemar, next to Estacion de Biologia Marina, Universidad de Chile, 32°57′25″S, 71°33′W, sheltered beach, intertidal sand, coll. Eric Guiler, Feb 1955 (10, LACM-AHF Poly 5022); Puerto Montt, 19 Dec 2003, coll. I. Kruse,(3, SEM, JAB); Isla Santa Maria, Dec 2003, coll. I. Kruse, 1 specimen (MCZ 135297). — Straits of Magellan, Punta Arenas, in sand, Sep 1892, Coll. W. Michaelsen, syntype of Aricia tribulosa (ZMB 6767).— Peru, Punta Chira, ca. 30 km north of Camana, 9 Aug 1955, intertidal, coll. G. Hartmann, holotype of Scoloplos armiger trioculata (ZMH P-14965). Description. A single complete specimen from Staten Island 8 mm long, 1 mm wide for 80 setigerous segments; larger specimens from Chile up to 40 mm long, 2.5 mm wide for about 185 segments. Anterior segments dorsoventrally flattened, abdominal segments cylindrical in cross section. Thoracic region with 22–25 segments; Peruvian specimen with 16. Color in alcohol brown with lighter areas between segments and on prostomium. Prostomium pear-shaped, acutely pointed on anterior margin (Fig. 36 A, D) or narrowing to rounded tip (Fig. 37 A); juveniles with short, rounded prostomium; with 0–3 pairs of eyespots, usually only present in smallest or juvenile specimens; nuchal organs narrow vertical slits at posterior margin of prostomium (Fig. 37 A); two indistinct achaetous rings preceding first setiger on smaller specimens (Figs. 36 A, 37A), forming smooth circular rings, ventrally forming lateral lips of mouth; larger specimens with less distinct rings, sometimes appearing to be single achaetous segment. Specimens from Montemar with multi-lobed proboscis everted (Fig. 36 D). Thoracic notopodia simple, with fascicles of long, tapering crenulated capillaries (Fig. 37 B–C); long, thin, cirriform postsetal lobe from setiger 1 (Fig. 36 A, D), gradually becoming longer and thicker in last 10 thoracic setigers. Abdominal notopodia elongated with swollen, medial expansion directed laterally (Fig. 36 E). Thoracic neuropodia expanded, with short, thick postsetal lobe from setiger 1 (Fig. 37 B–C). Abdominal notopodia with elongate postsetal lobe, thickened basally, tapering to narrow tip (Fig. 36 E). Abdominal neuropodia elongate divided apically producing short presetal lobe and elongate postsetal fingerlike lobe, between which setae emerge (Figs. 36 E, 37I). Thoracic notosetae including 10 or more long crenulated capillaries; abdominal notosetae with five or more capillaries and 2–5 furcate setae; each furcate seta with two unequal blunt-tipped tynes joined by thin membranous web composed of fine needles (Fig. 37 F–G). Thoracic neurosetae including dense fascicles of uncini in 5–6 long vertical rows and one short posterior row and crenulated capillaries in 1–2 rows posterior to uncini (Fig. 37 A–C); first row of uncini longest, curving ventrally below other uncini and continuing dorsally as posterior short row (Fig. 37 B–C). Uncini strongly bent in a posterior direction, convex side of shaft with transverse rows of minute barbs or teeth, curving into dorsal groove terminating apically in two pointed teeth (Fig. 37 D), with thin hyaline sheath observed in light microscope surrounding end of uncini (Fig. 36 C), with SEM sheath a flange, extending along lateral sides of shaft to point of emergence from neuropodium (Fig. 37 D); abdominal neurosetae with 2–5 crenulated capillaries and 1–2 protruding acicular spines with curved, blunt tips (Figs. 36 E, 37H–J). Cirriform branchiae from setiger 5 (Fig. 36 A–B). Pygidium with several large and small lobes, anal cirri absent (Fig. 36 B). Remarks. Leodamas tribulosus is readily distinguished from other species by the unusual thoracic neuropodial uncini with a dorsal groove that terminates in two apical teeth and with a prominent lateral sheath. The species is common along the Chilean coast and in Patagonia where it occurs in the intertidal zone (Hartman, 1966; Hartmann- Schröder, 1962b; 1965). The holotype of Scoloplos armiger trioculata agrees in all particulars with L. tribulosus, and is herein synonymized with this species. As part of a study of Orbiniidae phylogeny by Bleidorn et al. (2009), specimens identified as Protoariciella uncinata from Mar del Plata, Argentina were found to have the same genetic structure as Leodamas tribulosus from Chile and these authors concluded that the Argentinian specimens were juveniles of L. tribulosus . Elias et al. (2000) had earlier reported P. uncinata from Mar del Plata and noted that its morphology was variable including having a prostomium that was often pointed instead of rounded, thus further supporting the concept that juveniles of L. tribulosus have a rounded prostomium, two achaetous peristomial rings, and eyespots sometimes present. The same features are present in several of the smaller specimens examined in the present study. Three of the specimens given to C. Bleidorn were provided to me and were carefully examined; in addition to the characters mentioned, the thoracic neuropodial uncini have a distinct apical curvature, lateral sheath, and are bifid on the tips as in L. tribulosus . This does not confirm, however, that P. uncinata of Hartmann-Schröder (1962a) is the same species and in fact, it shares characters with Naineris grubei . Distribution. Peru; Chile; Argentina; Patagonia; intertidal to low water. : Published as part of Blake, James A., 2017, Polychaeta Orbiniidae from Antarctica, the Southern Ocean, the Abyssal Pacific Ocean, and off South America, pp. 1-145 in Zootaxa 4218 (1) on pages 78-80, DOI: 10.5281/zenodo.245827 : {"references": ["Ehlers, E. (1897) Polychaeta. In, Hamburger Magalhaenischen Sammelreise, 148 pp. [9 plates, Friedrichsen & Co., Hamburg.]", "Fauvel, P. (1907) Premiere note Preliminaire des Annelides Polychetes provenant des campagnes de l'Hirondelle et de la Princesse-Alice, au deposees dans le Musee Oceanographique de Monaco. Bulletin de l'Institut Oceanographique de Monaco, 107, 1 - 34, 1 figure.", "Mesnil, F. & Caullery, M. (1898) Etude de morphologie externe chez les Annelides. La famille nouvelle des Levinseniens. Revision des Ariciens-affinites des deux familles. Les Aspistobranchiens. Bulletin Scientifique de la France et de la Belgique, 31, 126 - 150, plate 6.", "Fauvel, P. (1941) Annelides polychetes de la Mission de Cap Horn (1882 - 1883). Bulletin du Museum d'Histoire Naturelle, Paris, series 2, 18, 272 - 298.", "Hartman, O. (1957) Orbiniidae, Apistobranchidae, Paraonidae and Longosomidae. Allan Hancock Pacific Expeditions, 15 (3), 211 - 393, plates 20 - 44, 1 chart.", "Hartmann-Schroder, G. (1962 b) Die Polychaeten des Eulitorals. In: G. Hartmann-Schroder & Hartmann, G. (Eds.), Zur Kenntnis des Eulitorals der chilenischen Pazifikkuste und der argentinischen Kuste, Sudpatgoniens unter besonderer Berucksichtigung der Polychaeten und Ostracoden. Mitteilungen des Hamburgischen Zoologischen Museums und Instituts, Supplement, 60, 57 - 167, 228 figures.", "Rozbaczylo, N. (1985) Los Anelidos Poliquetos de Chile. Indice Sinonimico y distribucion geografica de especies. Facultad de Ciencias Biologicas Pontificia Universidad Catolica de Chile, Monografias Biologicas, No. 3, 1 - 284.", "Elias, R., Vallarino, E. A. & Bremec, C. S. (2000) Protoariciella uncinata Hartmann-Schroder, 1962 (Polychaeta, Orbiniidae): a new record for intertidal mussel beds of the southwestern Atlantic shore affected by sewage effluents. Revista de Biologia Marina y Oceanograpfia, 35 (2), 181 - 184.", "Bleidorn, C. Hill, N., Erseus, C. & Tiedemann, R. (2009) On the role of character loss in orbiniid phylogeny (Annelida): Molecules vs. Morphology. Molecular Phylogenetics and Evolution, 52, 57 - 69.", "Hartman, O. (1966) Polychaeta Myzostomidae and Sedentaria of Antarctica. Antarctic Research Series, 7, 1 - 158, 46 plates, 5 charts. American Geophysical Union, Washington, D. C.", "Hartmann-Schroder, G. (1965) Die Polychaeten des Sublitorals. In: Hartmann-Schroder, G. und Hartmann, G., (Eds), Zur Kenntnis des Sublitorals der chilenischen Kuste unter besonderer Beruchsichtigung der Polychaeten und Ostracoden. Mitteilungen des Hamburgischen Zoologischen Museums und Instituts, Supplement, 62, 59 - 305, 300 figures.", "Hartmann-Schroder, G. (1962 a) Zweiter Beitrag zur Polychaetenfauna von Peru. Kieler Meersforschungen, 18, 109 - 147, 20 figures."]} |
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