Syndesmis selknami, Brusa & Montes & Marcotegui & Martorelli, 2017
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publication ID |
https://doi.org/ 10.1016/j.ijppaw.2017.03.002 |
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publication LSID |
lsid:zoobank.org:pub:A20D54CF-7B34-4330-A5E3-A93DFB9866ED |
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persistent identifier |
https://treatment.plazi.org/id/041CB790-B99C-40F6-8571-AC02DCD740F9 |
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taxon LSID |
lsid:zoobank.org:act:041CB790-B99C-40F6-8571-AC02DCD740F9 |
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treatment provided by |
Felipe |
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scientific name |
Syndesmis selknami |
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3.1. Syndesmis selknami n. sp.
( Figs. 1 — 2 View Fig View Fig ).
3.1.1. Morphology
Worms 0.54 — 0.81 mm (0.69 ± 0.07, n = 8) long, 0.35 — 0.47 mm (0.43 ± 0.02, n = 8) maximum width at level of middle part of body ( Figs. 1 View Fig and 2 View Fig ). Epidermis ciliated and epithelial cells taller in anterior region of body. In the anteriordorsal region, there are invaginations of the body wall forming sensory pits ( Fig. 2F View Fig ), internally associated with projections on the brain. Mouth anteroventral, opening into a doliiform pharynx. Pharynx 62.5 — 75 M m (67.5 ± 6.94, n = 8) in diameter. Vacuolated cells in the transition region between pharynx and intestine ( Fig. 2E View Fig ).
Paired testes on both sides of anterior body midline ( Fig. 1 View Fig ), slightly lobulated, extending from posterior half of pharynx to posterior first 1/3 of body length, slightly overlapping vitellaria posteriorly ( Fig. 1 View Fig ). The ejaculatory duct ( Fig. 2C View Fig ) connects the testes with a small seminal vesicle connected with the stylet by a narrow duct. Long penis stylet, beginning at funnel-like structure and projecting into male antrum, 190 — 250 M m (221.6 ± 30.13, n = 3) long ( Fig. 2D View Fig ). Male antrum muscle walls with circularly oriented, opening into a common genital atrium. Genital pore at posterior tip of body.
Massive vitellaria overlapping to posterior region of testes, slightly lobulated, fan-like. Paired ovaries between vitellaria and filament glands, overlapping both. They are lobulated. Filament glands grouped in the last part of the body ( Fig. 2 View Fig ).
Vitellaria join ovaries and enter the seminal receptacle at its anterior-most portion. Seminal receptacle ( Fig. 2B and C View Fig ) formed by spherical anterior portion, becoming elongated posteriorly, lumen with sperm. Vagina gradually wider distally, reaching a common genital atrium. Uterus ventrally, about 2/3 of the body length. Entry of uterus into common genital atrium ventral to entrances of male antrum and vagina. Filament glands occupying almost whole posterior third of body. Mature egg capsules ovoid, with the opening area forming by small plates ( Fig. 2B and C View Fig ). Eggs 100 — 132.5 M m (117.5 ± 13.38, n = 4) long, 62.5 — 85 M m (68.125 ± 11.25, n = 4) wide, brown, with a long filament on one pole; filament long and in distal part rolled on itself ( Figs. 1 View Fig and 2A View Fig ); in some specimens, filament straight and thick and with distal region threaded with thickening at tip.
3.1.2. Etymology This species is named in honor of the Selk'nam or Onas tribe who lived in the region where this species was found.
3.1.3. Study material
Eight whole mount specimens stained with Gill's Hematoxylin, three specimens cleared in polyvinyl-lactophenol and two specimens serially sectioned at 4- M m thick stained with Masson's trichrome method.
3.1.4. Specimens deposited
The studied specimens have been deposited at the Invertebrate Collection of Museo de La Plata. Holotype MLP-He 7266, whole mount specimen stained with Gill's Hematoxylin. Paratype MLP-He 7268, whole mount specimen stained with Gill's Hematoxylin. MLP-He 7273, sagittal section specimens stained with Masson's trichrome method .
3.1.5. Localities
Bahía Camarones (44 Ǫ 51, 2.09́S, 65 Ǫ 40, 52́W) and Beagle Channel (54 Ǫ 10, 2.4́S, 65 Ǫ 30, 0.8́W) .
3.1.6. Prevalence of infection 47% (17/36 urchins).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.