Cheliplana hawaiiensis, Gobert & Diez & Monnens & Reygel & Van Steenkiste & Leander & Artois, 2021
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publication ID |
https://doi.org/ 10.11646/zootaxa.4970.3.2 |
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publication LSID |
lsid:zoobank.org:pub:FEABE248-E1EA-48F5-A1AF-0077FE40C257 |
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DOI |
https://doi.org/10.5281/zenodo.4912307 |
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persistent identifier |
https://treatment.plazi.org/id/03E0878B-1871-FF9A-62BE-1C79FB2DCCED |
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treatment provided by |
Plazi |
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scientific name |
Cheliplana hawaiiensis |
| status |
sp. nov. |
Cheliplana hawaiiensis n. sp. Gobert, Reygel, Van Steenkiste & Artois
Fig. 2A–C View FIGURE 2 , Fig. 3A–C View FIGURE 3 , Fig. 4 View FIGURE 4
Etymology. The species epithet refers to the Hawaiian archipelago, where the species was first found.
Material examined. Holotype. UNITED STATES • 1 whole mount; Hawaii, Oahu, Waimanalo Beach ; 21°19’36”N, 157°40’59”W; 31 May 2010; intertidal zone, fine sand with organic detritus among blocks of coral; KV.635. GoogleMaps
Other material. UNITED STATES • 6 whole mounts and two serial sections; Hawaii, Oahu, Waimanalo Beach ; 21°19’36”N, 157°40’59”W; 31 May 2010; intertidal zone, fine sand with organic detritus among blocks of coral; HU X.2.26–X.2.33 GoogleMaps .
CANADA • 3 whole mounts; British Columbia, Calvert Island, West Beach; 51°39’24”N, 128°08’41”W; 3 Jun. 2015; intertidal zone, medium-grained sand from the beach surface; MI4186–MI4188 GoogleMaps • 3 whole mounts; British Columbia, Calvert Island , North Beach ; 51°39’52”N, 128°08’46”W; 7 Jun. 2017; coarse sand in lower intertidal; MI4189–MI4191 GoogleMaps • 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; MI4192 GoogleMaps .
Description. Specimens are largely transparent, with a weak brown to orange colouration ( Figs. 3A View FIGURE 3 , 4A View FIGURE 4 ). A caudal haptic girdle is present (ag, Fig. 2A View FIGURE 2 ). The proboscis of the Hawaiian specimens is ~37 μm long with 18-μmlong muscular hook supports and a pair of smooth proboscis hooks ~20 μm long (h, hs, Fig. 3B View FIGURE 3 ). The proboscis of the Canadian specimens is about 28 μm long with 10-μm-long hook supports and 18 μm long hooks (h, hs, Fig. 4B; 4D View FIGURE 4 ). The proboscis sidepieces are straight, non-sclerotised rods, with enlarged distal ends, bearing a single bristle (sp, Figs. 3B View FIGURE 3 ; 4B View FIGURE 4 ).
The mouth is situated directly posterior to the proboscis. The pharynx is positioned in the anterior part of the body (ph, Figs. 2A View FIGURE 2 ; 3A View FIGURE 3 ; 4A View FIGURE 4 ) and connects to the mouth via a long, slender oral cavity lined with spines (ppc, Fig. 2A View FIGURE 2 ; 4A View FIGURE 4 ). The anterior edge of the pharynx is lined with papillae. In some specimens, the body contains large numbers of diatom frustules.
A single testis is present in the anterior body half, just behind and/or alongside the pharynx (t, Fig. 2A View FIGURE 2 ; 3A View FIGURE 3 ; 4A View FIGURE 4 ). The posterior part of the testis shows a globular accumulation of sperm, probably corresponding to the area where the testis connects to the vas deferens. The male copulatory bulb measures ~117 μm in the Hawaiian specimens (cb, Fig. 3A View FIGURE 3 ) and 75–100 µm in the Canadian specimens (cb, Fig. 4A,C,E View FIGURE 4 ). Two seminal vesicles enter the copulatory bulb proximally (vs, Figs. 2A View FIGURE 2 ; 4A,C View FIGURE 4 ). The copulatory bulb is of the conjuncta duplex type ( Karling 1956) and is surrounded by a sheath of longitudinal muscles. The presence of circular muscles surrounding the copulatory bulb could not be determined. The large prostatic glands also enter the copulatory bulb proximally and form a prostatic vesicle in the proximal part of the bulb (pg, vg, Figs. 2A View FIGURE 2 ; 3A View FIGURE 3 ; 4A,C View FIGURE 4 ). The distal part of the bulb holds the ejaculatory duct, the distal end of which forms an armed cirrus ( Figs. 2C View FIGURE 2 ; 3C View FIGURE 3 ; ci, Figs. 2A View FIGURE 2 ; 3A View FIGURE 3 ; 4A,C,E View FIGURE 4 ) measuring 30–40 μm ( Canada) or 41–68 μm (Hawaii). The cirrus is differentiated in three distinct regions ( Figs. 2C View FIGURE 2 ; 4E View FIGURE 4 ): the most proximal part is tubular, with a length of 15–31 μm (x = 21 μm, n = 6; Hawaii) or 12–18 μm (x = 15 μm, n = 7; Canada) and a diameter of 8–16 μm (x = 12 μm, n = 6; Hawaii) or 7–9 μm (x = 8 μm, n = 7; Canada). This part is armed with very fine spines with a rectangular base. This proximal tube is followed distally by a ring of six long, curved spines of ~12 μm long (measured on Canadian specimens), each set in sclerotised pockets. The most distal region is 23–34 μm (x = 27 μm, n = 6; Hawaii) or 12–17 μm (x = 15 μm, n = 7; Canada) long, with a diameter of ~17–26 μm (x = 22 μm, n = 6; Hawaii) or 12–17 μm (x = 14 μm, n = 7; Canada). This distal part is lined with densely stacked, bristle-like spines with a length of ~8 μm (Hawaii) or ~5 μm ( Canada).
A single, large ovary is present near the copulatory apparatus (ov, Fig. 4A View FIGURE 4 ). A bursa is situated posterior to the common genital opening (b, Fig. 4A,C View FIGURE 4 ). No spermatic duct or vagina externa were observed.
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.
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