Gymnodoris fassioae De Souza-Canal & Valdes 2025, sp. nov.
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| author | Souza-Canal, Jade De Valdés, Ángel |
| author_facet | Souza-Canal, Jade De Valdés, Ángel |
| contents | <p><b><i>Gymnodoris fassioae</i> De Souza-Canal & Valdés sp. nov.</b></p><p>urn:lsid:zoobank.org:act: 558047D3-D711-417F-A173-FD05C8111161</p><p>(Fig. 17H–I, 18D, 19C–E)</p><p><b>Type material.</b> <b>Holotype: New Caledonia: North Province:</b> Koumac, Passe Deverd (20°44.6'S, 164°15.7'E), 21 m depth [Koumac 2.1 Expedition, stn. KR623], 21 Sep 2018, 1 specimen 5 mm preserved length (MNHN-IM-2019- 26502, isolate JD24).</p><p><b>Description</b>. Body oval to elongate, with numerous, small conical to elongate tubercles of varying sizes. Notal rim distinct, with several larger tubercles than those on dorsum, velum absent, notal rim fuses into head forming a protuberance, edged by arch or small tubercles anterior to rhinophores (Fig. 18D). Color translucent white, tubercles red with blurry edges; longitudinal lines of blurry red pigment joining some tubercles; posterior end of foot translucent grey with red tip. Internal organs visible through body wall as orange, white masses. Rhinophores very close together, bulbous, with 8 lamellae, stalk white, club red. Gill with 35 small, elongate, simple, translucent leaves with red tips, opaque white bases, arranged in circle around anus, opened posteriorly. Foot narrower than notum, opaque white. Oral tentacles small, blunt.</p><p>Radular formula 24 × 21.0. 21 in the 5 mm preserved length holotype (MNHN-IM-2019-26502). Innermost lateral teeth small, broad, irregular bases, with central curved cusp (Fig. 19C). Other lateral teeth elongate, with broad bases, long, slightly curved cusps (Fig. 19E).</p><p>Reproductive system with a large, broad, slightly curved ampulla, connecting to female gland complex, prostate (Fig. 17H). Prostate tubular, curved around bursa copulatrix, narrowing into a highly convoluted deferent duct, opening into a common atrium with vagina. Vagina long, narrow, slightly curved, connecting into bursa copulatrix near seminal receptacle connection. Bursa copulatrix ovoid, about five times as large as spherical seminal receptacle. Penial spines slightly curved, elongate (about 80 µm long), with narrow bases (Fig. 17I).</p><p><b>Phylogenetic position</b>. <i>Gymnodoris fassioae</i> <b>sp. nov.</b> is sister to <i>Gymnodoris</i> sp. 18 (PP: 1, MLB: 99) but the position of these two species within the overall phylogeny of <i>Gymnodoris</i> remains unresolved (Fig. 1A).</p><p><b>Etymology</b>. This species is named in honor of Dr. Giulia Fassio in appreciation for her help and support during the expeditions to New Caledonia.</p><p><b>Remarks</b>. <i>Gymnodoris fassioae</i> <b>sp. nov.</b> is externally similar in body shape to <i>Gymnodoris inariensis</i> Hamatani & Osumi, 2003 described from Kagoshima Bay, Japan. Both species have rhinophores very close to each other at the base, a well-defined notal rim, and an anterior protuberance instead of a velum. However, there are clear differences between the two species, for instance, <i>G. inariensis</i> lacks a gill, which is present in <i>G. fassioae</i> <b>sp. nov.</b>, and <i>G. inariensis</i> is blackish with densely scattered, minute dark brown-black spots, whereas <i>G. fassioae</i> <b>sp. nov.</b> is translucent white, with red tubercles with blurry edges. No other species included in Knutson & Gosliner (2022) is similar externally or genetically to <i>G. fassioae</i> <b>sp. nov.</b></p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_17883940 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Gymnodoris fassioae De Souza-Canal & Valdes 2025, sp. nov. Souza-Canal, Jade De Valdés, Ángel Biodiversity Taxonomy Animalia Mollusca Gastropoda Nudibranchia Polyceridae Gymnodoris Gymnodoris fassioae <p><b><i>Gymnodoris fassioae</i> De Souza-Canal & Valdés sp. nov.</b></p><p>urn:lsid:zoobank.org:act: 558047D3-D711-417F-A173-FD05C8111161</p><p>(Fig. 17H–I, 18D, 19C–E)</p><p><b>Type material.</b> <b>Holotype: New Caledonia: North Province:</b> Koumac, Passe Deverd (20°44.6'S, 164°15.7'E), 21 m depth [Koumac 2.1 Expedition, stn. KR623], 21 Sep 2018, 1 specimen 5 mm preserved length (MNHN-IM-2019- 26502, isolate JD24).</p><p><b>Description</b>. Body oval to elongate, with numerous, small conical to elongate tubercles of varying sizes. Notal rim distinct, with several larger tubercles than those on dorsum, velum absent, notal rim fuses into head forming a protuberance, edged by arch or small tubercles anterior to rhinophores (Fig. 18D). Color translucent white, tubercles red with blurry edges; longitudinal lines of blurry red pigment joining some tubercles; posterior end of foot translucent grey with red tip. Internal organs visible through body wall as orange, white masses. Rhinophores very close together, bulbous, with 8 lamellae, stalk white, club red. Gill with 35 small, elongate, simple, translucent leaves with red tips, opaque white bases, arranged in circle around anus, opened posteriorly. Foot narrower than notum, opaque white. Oral tentacles small, blunt.</p><p>Radular formula 24 × 21.0. 21 in the 5 mm preserved length holotype (MNHN-IM-2019-26502). Innermost lateral teeth small, broad, irregular bases, with central curved cusp (Fig. 19C). Other lateral teeth elongate, with broad bases, long, slightly curved cusps (Fig. 19E).</p><p>Reproductive system with a large, broad, slightly curved ampulla, connecting to female gland complex, prostate (Fig. 17H). Prostate tubular, curved around bursa copulatrix, narrowing into a highly convoluted deferent duct, opening into a common atrium with vagina. Vagina long, narrow, slightly curved, connecting into bursa copulatrix near seminal receptacle connection. Bursa copulatrix ovoid, about five times as large as spherical seminal receptacle. Penial spines slightly curved, elongate (about 80 µm long), with narrow bases (Fig. 17I).</p><p><b>Phylogenetic position</b>. <i>Gymnodoris fassioae</i> <b>sp. nov.</b> is sister to <i>Gymnodoris</i> sp. 18 (PP: 1, MLB: 99) but the position of these two species within the overall phylogeny of <i>Gymnodoris</i> remains unresolved (Fig. 1A).</p><p><b>Etymology</b>. This species is named in honor of Dr. Giulia Fassio in appreciation for her help and support during the expeditions to New Caledonia.</p><p><b>Remarks</b>. <i>Gymnodoris fassioae</i> <b>sp. nov.</b> is externally similar in body shape to <i>Gymnodoris inariensis</i> Hamatani & Osumi, 2003 described from Kagoshima Bay, Japan. Both species have rhinophores very close to each other at the base, a well-defined notal rim, and an anterior protuberance instead of a velum. However, there are clear differences between the two species, for instance, <i>G. inariensis</i> lacks a gill, which is present in <i>G. fassioae</i> <b>sp. nov.</b>, and <i>G. inariensis</i> is blackish with densely scattered, minute dark brown-black spots, whereas <i>G. fassioae</i> <b>sp. nov.</b> is translucent white, with red tubercles with blurry edges. No other species included in Knutson & Gosliner (2022) is similar externally or genetically to <i>G. fassioae</i> <b>sp. nov.</b></p> |
| title | Gymnodoris fassioae De Souza-Canal & Valdes 2025, sp. nov. |
| topic | Biodiversity Taxonomy Animalia Mollusca Gastropoda Nudibranchia Polyceridae Gymnodoris Gymnodoris fassioae |
| url | https://doi.org/10.5281/zenodo.17883940 |