Cheliplana setosa Evdonin 1971
Creators: name: Gobert, Stefan
name: Diez, Yander L.
name: Monnens, Marlies
name: Reygel, Patrick
name: Van Steenkiste, Niels W. L.
name: Leander, Brian S.
name: Artois, Tom
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Rhabditophora
Rhabdocoela
Karkinorhynchidae
Cheliplana
Cheliplana setosa

description: Cheliplana setosa Evdonin, 1971
Fig. 9A–D
Material examined. New material. CANADA • 1 whole mount; British Columbia, Calvert Island, Foggy Cove; 51°39’07”N, 128°08’32”W; 9 Apr. 2016; medium-grained sand in between boulders in the lower intertidal; MI4193 • 1 whole mount; British Columbia, Bamfield, Brady Beach; 48°49’40”N, 125°09’12”W; 3 Jun. 2015; mediumgrained sand in lower intertidal; MI4194.
Reference material. 1 whole-mounted specimen (SMNH 90403) and 1 serially sectioned specimen (SMNH 102990) from California, United States.
Known distribution. Posyet, Peter the Great Gulf, Russia (Evdonin 1977). Monterey Bay, California, United States (Karling 1983). Ría de Villaviciosa, near San Martin, Spain (Noreña et al. 2007).
Remarks. Live specimens are ~ 1.5 mm long. Specimens are yellowish to pinkish in colour (Fig. 9A). The proboscis bears curved proboscis hooks measuring 18–20 μm (h, Fig. 9C). Hook supports are about 12 μm long in the specimens from Canada (hs, Fig. 9C). Rod-shaped, weakly sclerotised proboscis sidepieces were observed by Karling (1983). The prepharyngeal tube is armed with spines (ppc, Fig. 9A).
A single, large testis is situated alongside the pharynx (ph, t, Fig. 9A). Karling (1983) reports a lobe containing sperm at the posterior end of the testis. A pair of seminal vesicles, one of which ending blindly, the other connecting to the testis via an unpaired vas deferens, enter the proximal end of the copulatory bulb (cb, vs, Fig. 9A–B,D). The copulatory bulb is oviform (cb, Fig. 9A–B,D). In the Russian specimens, Evdonin (1971) measures a size range of 110 to 120 μm for the copulatory bulb. The Californian specimen described by Karling (1983) possesses a copulatory bulb of ~130 μm. The copulatory bulbs in the new specimens from Canada are somewhat larger still, measuring 130–160 μm. The copulatory bulb holds a cirrus of 40–60 μm (Russia and California) (Evdonin 1971; Karling 1983) or 68–85 μm (Canada) (ci, Fig. 9 A–B,D). The cirrus can be divided in three clearly defined regions: (1) a proximal tube-like region of ~48 μm (California) to 48–60 μm (Canada), armed with fine spines, (2) a ring of five or six large spines of about 10–15 μm (Canada) long, set in sclerotised pockets, and (3) a distal region of ~7 μm (California) to 15–17 μm (Canada) long, wider than the proximal region, armed with hair-like spines.
A single ovary (ov, Fig. 9A) and bursa are situated near the caudal body end.
description: Published as part of Gobert, Stefan, Diez, Yander L., Monnens, Marlies, Reygel, Patrick, Van Steenkiste, Niels W. L., Leander, Brian S. & Artois, Tom, 2021, A revision of the genus Cheliplana de Beauchamp, 1927 (Rhabdocoela: Schizorhynchia), with the description of six new species, pp. 453-494 in Zootaxa 4970 (3) on pages 480-482, DOI: 10.11646/zootaxa.4970.3.2, http://zenodo.org/record/4766692