Mikro oviceps Ortega & Gofas 2019, n. sp.
Mikro oviceps n. sp. (Fig. 4 A-H) urn:lsid:zoobank.org:act: D9DA7056-2000-417A-92C5-AEE1AF757354 TYPE MATERIAL. — Holotype. sh., MNHN-IM- 2000-34255. Paratypes . 24 sh., MNHN-IM-2000-34256, all from SEAMOUNT 2, DW 130. TYPE LOCALITY. — Off NW Gran Canaria, 28°08.95’N, 15°53.11’W / 28°09.06’N, 15°52....
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Online Access: | https://dx.doi.org/10.5281/zenodo.3729429 https://zenodo.org/record/3729429 |
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ftdatacite:10.5281/zenodo.3729429 |
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institution |
Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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unknown |
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Biodiversity Taxonomy Animalia Mollusca Gastropoda Trochida Skeneidae Mikro Mikro oviceps |
spellingShingle |
Biodiversity Taxonomy Animalia Mollusca Gastropoda Trochida Skeneidae Mikro Mikro oviceps Ortega, José Rafael Gofas, Serge Mikro oviceps Ortega & Gofas 2019, n. sp. |
topic_facet |
Biodiversity Taxonomy Animalia Mollusca Gastropoda Trochida Skeneidae Mikro Mikro oviceps |
description |
Mikro oviceps n. sp. (Fig. 4 A-H) urn:lsid:zoobank.org:act: D9DA7056-2000-417A-92C5-AEE1AF757354 TYPE MATERIAL. — Holotype. sh., MNHN-IM- 2000-34255. Paratypes . 24 sh., MNHN-IM-2000-34256, all from SEAMOUNT 2, DW 130. TYPE LOCALITY. — Off NW Gran Canaria, 28°08.95’N, 15°53.11’W / 28°09.06’N, 15°52.92’W, 655- 660 m. ETYMOLOGY. — From the Latin meaning “egghead”, referring to the shape of the protoconch. DESCRIPTION Shell minute, globular in shape, with a moderately high, somewhat cyrtoconoid spire and a distinct umbilicus. Protoconch proportionally very large, egg shaped with no sign of coiling, with a maximum diameter of 270 µm, separated from the teleoconch by a distinct scar; protoconch surface with a microscopically pitted texture seen only at high magnification under the SEM. Teleoconch of about 1 3/4 whorl. Spire whorls with a weak spiral cordlet running along the suture, a very distinct adapical shoulder delimited by a sharp keel, channelled between the suture and the keel and slightly convex below it. Surface mostly smooth except for growth lines, a cluster of 4-6 spiral cordlets below the periphery of the last whorl, and another cluster of three stronger spiral cords surrounding the umbilicus. Aperture with a somewhat rhomboidal shape, with the adapical part definitely angled. Outer lip rather thick but simple, orthocline; parietal area without any callosity, columellar edge of the aperture increasing in thickness abapically. Umbilicus open, deep and relatively broad, inside with axial growth lines of a very rough texture, and with an additional spiral cord situated deep inside and abutting into the abapical part of the columella. Colour opaque white, with a somewhat pearly aspect, the protoconch slightly yellowish. Maximum diameter up to 0.8 mm (holotype 0.84 mm height × 0.80 mm diameter). REMARKS The generic assignment of this species is tentative; shared characters with the type species Mikro globulus Warén, 1996 are the minute size, the protoconch with a rough but not distinctly sculptured surface, the presence of a distinct adapical keel at a short distance from the suture, and of a distinct spiral ridge inside the umbilicus. Lopheliella Hoffmann, van Heugten & Lavaleye, 2008 is similar in shape but has a distinct honeycomb sculpture on the protoconch which is not seen here; Lopheliella also either lacks an internal ridge inside the umbilicus or has it very close to its edge, not far inside as in Mikro globulus . Lopheliella species are also considerably larger, with an adult size of 2 to 3 mm. Mikro oviceps n. sp. is unique in having a protoconch which shows no sign of coiling, contrary to M. globulus and M. hattonensis Hoffman, van Heugten & Lavaleye, 2010 which were also collected in the same dredge haul. Mikro globulus (Fig. 4 I-L) is similar in size but has a higher spire, not cyrtoconoid. It lacks the clusters of spirals on the periphery and the abapical part of the last whorl; the subsutural shoulder disappears on the later whorls, and the umbilicus is narrower with only one periumbilical ridge, and no spirals inside. Mikro hattonensis (Fig. 4 M-P) is more similar to M. oviceps n. sp. in outline, but also lacks the spirals on the last whorl and is more broadly umbilicate. Both M. globulus and M. hattonensis have a protoconch as usual in Vetigastropoda i.e. coiled with hardly more than half a whorl (Fig. 4 L, P). Both also have been found in the same sample as M. oviceps n. sp. and are new records for Spanish waters (see below). : Published as part of Ortega, José Rafael & Gofas, Serge, 2019, The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca, pp. 513-551 in Zoosystema 41 (26) on page 520, DOI: 10.5252/zoosystema2019v41a26, http://zenodo.org/record/3726028 : {"references": ["WAREN A. 1996. - New and little known mollusca from Iceland and Scandinavia Part 3. Sarsia 81: 197 - 245. https: // doi. org / 10. 1080 / 00364827.1996.10413622", "HOFFMAN L., VAN HEUGTEN B. & LAVALEYE M. S. S. 2010. - Skeneimorph species (Gastropoda) from the Rockall and Hatton Banks, northeastern Atlantic Ocean. Miscellanea Malacologica 4 (4): 47 - 61."]} |
format |
Text |
author |
Ortega, José Rafael Gofas, Serge |
author_facet |
Ortega, José Rafael Gofas, Serge |
author_sort |
Ortega, José Rafael |
title |
Mikro oviceps Ortega & Gofas 2019, n. sp. |
title_short |
Mikro oviceps Ortega & Gofas 2019, n. sp. |
title_full |
Mikro oviceps Ortega & Gofas 2019, n. sp. |
title_fullStr |
Mikro oviceps Ortega & Gofas 2019, n. sp. |
title_full_unstemmed |
Mikro oviceps Ortega & Gofas 2019, n. sp. |
title_sort |
mikro oviceps ortega & gofas 2019, n. sp. |
publisher |
Zenodo |
publishDate |
2019 |
url |
https://dx.doi.org/10.5281/zenodo.3729429 https://zenodo.org/record/3729429 |
long_lat |
ENVELOPE(-57.950,-57.950,-63.950,-63.950) |
geographic |
Ortega |
geographic_facet |
Ortega |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
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op_rights |
Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC0 |
op_doi |
https://doi.org/10.5281/zenodo.3729429 https://doi.org/10.5252/zoosystema2019v41a26 https://doi.org/10.5281/zenodo.3726036 https://doi.org/10.5281/zenodo.3729430 |
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1766043936510443520 |
spelling |
ftdatacite:10.5281/zenodo.3729429 2023-05-15T16:53:23+02:00 Mikro oviceps Ortega & Gofas 2019, n. sp. Ortega, José Rafael Gofas, Serge 2019 https://dx.doi.org/10.5281/zenodo.3729429 https://zenodo.org/record/3729429 unknown Zenodo http://zenodo.org/record/3726028 http://publication.plazi.org/id/FFDFFFD8B258FF879A52FFD1FFCDFFBB http://zoobank.org/urn:lsid:zoobank.org:pub:CF16A992-0401-44C8-BEEE-842CE7F1D27E https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5252/zoosystema2019v41a26 http://zenodo.org/record/3726028 http://publication.plazi.org/id/FFDFFFD8B258FF879A52FFD1FFCDFFBB https://dx.doi.org/10.5281/zenodo.3726036 http://zoobank.org/urn:lsid:zoobank.org:pub:CF16A992-0401-44C8-BEEE-842CE7F1D27E https://dx.doi.org/10.5281/zenodo.3729430 https://zenodo.org/communities/biosyslit Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess CC0 Biodiversity Taxonomy Animalia Mollusca Gastropoda Trochida Skeneidae Mikro Mikro oviceps Taxonomic treatment article-journal Text ScholarlyArticle 2019 ftdatacite https://doi.org/10.5281/zenodo.3729429 https://doi.org/10.5252/zoosystema2019v41a26 https://doi.org/10.5281/zenodo.3726036 https://doi.org/10.5281/zenodo.3729430 2022-02-08T13:29:49Z Mikro oviceps n. sp. (Fig. 4 A-H) urn:lsid:zoobank.org:act: D9DA7056-2000-417A-92C5-AEE1AF757354 TYPE MATERIAL. — Holotype. sh., MNHN-IM- 2000-34255. Paratypes . 24 sh., MNHN-IM-2000-34256, all from SEAMOUNT 2, DW 130. TYPE LOCALITY. — Off NW Gran Canaria, 28°08.95’N, 15°53.11’W / 28°09.06’N, 15°52.92’W, 655- 660 m. ETYMOLOGY. — From the Latin meaning “egghead”, referring to the shape of the protoconch. DESCRIPTION Shell minute, globular in shape, with a moderately high, somewhat cyrtoconoid spire and a distinct umbilicus. Protoconch proportionally very large, egg shaped with no sign of coiling, with a maximum diameter of 270 µm, separated from the teleoconch by a distinct scar; protoconch surface with a microscopically pitted texture seen only at high magnification under the SEM. Teleoconch of about 1 3/4 whorl. Spire whorls with a weak spiral cordlet running along the suture, a very distinct adapical shoulder delimited by a sharp keel, channelled between the suture and the keel and slightly convex below it. Surface mostly smooth except for growth lines, a cluster of 4-6 spiral cordlets below the periphery of the last whorl, and another cluster of three stronger spiral cords surrounding the umbilicus. Aperture with a somewhat rhomboidal shape, with the adapical part definitely angled. Outer lip rather thick but simple, orthocline; parietal area without any callosity, columellar edge of the aperture increasing in thickness abapically. Umbilicus open, deep and relatively broad, inside with axial growth lines of a very rough texture, and with an additional spiral cord situated deep inside and abutting into the abapical part of the columella. Colour opaque white, with a somewhat pearly aspect, the protoconch slightly yellowish. Maximum diameter up to 0.8 mm (holotype 0.84 mm height × 0.80 mm diameter). REMARKS The generic assignment of this species is tentative; shared characters with the type species Mikro globulus Warén, 1996 are the minute size, the protoconch with a rough but not distinctly sculptured surface, the presence of a distinct adapical keel at a short distance from the suture, and of a distinct spiral ridge inside the umbilicus. Lopheliella Hoffmann, van Heugten & Lavaleye, 2008 is similar in shape but has a distinct honeycomb sculpture on the protoconch which is not seen here; Lopheliella also either lacks an internal ridge inside the umbilicus or has it very close to its edge, not far inside as in Mikro globulus . Lopheliella species are also considerably larger, with an adult size of 2 to 3 mm. Mikro oviceps n. sp. is unique in having a protoconch which shows no sign of coiling, contrary to M. globulus and M. hattonensis Hoffman, van Heugten & Lavaleye, 2010 which were also collected in the same dredge haul. Mikro globulus (Fig. 4 I-L) is similar in size but has a higher spire, not cyrtoconoid. It lacks the clusters of spirals on the periphery and the abapical part of the last whorl; the subsutural shoulder disappears on the later whorls, and the umbilicus is narrower with only one periumbilical ridge, and no spirals inside. Mikro hattonensis (Fig. 4 M-P) is more similar to M. oviceps n. sp. in outline, but also lacks the spirals on the last whorl and is more broadly umbilicate. Both M. globulus and M. hattonensis have a protoconch as usual in Vetigastropoda i.e. coiled with hardly more than half a whorl (Fig. 4 L, P). Both also have been found in the same sample as M. oviceps n. sp. and are new records for Spanish waters (see below). : Published as part of Ortega, José Rafael & Gofas, Serge, 2019, The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca, pp. 513-551 in Zoosystema 41 (26) on page 520, DOI: 10.5252/zoosystema2019v41a26, http://zenodo.org/record/3726028 : {"references": ["WAREN A. 1996. - New and little known mollusca from Iceland and Scandinavia Part 3. Sarsia 81: 197 - 245. https: // doi. org / 10. 1080 / 00364827.1996.10413622", "HOFFMAN L., VAN HEUGTEN B. & LAVALEYE M. S. S. 2010. - Skeneimorph species (Gastropoda) from the Rockall and Hatton Banks, northeastern Atlantic Ocean. Miscellanea Malacologica 4 (4): 47 - 61."]} Text Iceland DataCite Metadata Store (German National Library of Science and Technology) Ortega ENVELOPE(-57.950,-57.950,-63.950,-63.950) |