Adontorhina similis Barry & McCormack, new species
Adontorhina similis, Barry & McCormack, new species (Figures 4–5) Mendicula pygmaea Oliver & Killeen (2002, p. 56–58, plate 23) Thyasira subtrigona Hartley (1984, p. 192) Type locality. Porcupine Bank, 53 °07.77’N, 13 ° 13.37 ’W, 252 m Eastern Atlantic. Holotype. A complete shell, collected...
Main Authors: | , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Zenodo
2007
|
Subjects: | |
Online Access: | https://dx.doi.org/10.5281/zenodo.5665912 https://zenodo.org/record/5665912 |
id |
ftdatacite:10.5281/zenodo.5665912 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Mollusca Bivalvia Lucinoida Thyasiridae Adontorhina Adontorhina similis |
spellingShingle |
Biodiversity Taxonomy Animalia Mollusca Bivalvia Lucinoida Thyasiridae Adontorhina Adontorhina similis Barry, Peter J. Mccormack, Grace P. Adontorhina similis Barry & McCormack, new species |
topic_facet |
Biodiversity Taxonomy Animalia Mollusca Bivalvia Lucinoida Thyasiridae Adontorhina Adontorhina similis |
description |
Adontorhina similis, Barry & McCormack, new species (Figures 4–5) Mendicula pygmaea Oliver & Killeen (2002, p. 56–58, plate 23) Thyasira subtrigona Hartley (1984, p. 192) Type locality. Porcupine Bank, 53 °07.77’N, 13 ° 13.37 ’W, 252 m Eastern Atlantic. Holotype. A complete shell, collected by P.J. Barry, NMINH. 2006.58. Measurements (Length x height x breadth). 1.14 mm x 0.78 mm x 0.62 mm. Paratypes. Three specimens, as holotype, NMINH.2006.64.1– 2. Measurements 1.25 mm x 0.94 mm x 0.6mm; 1.17 mm x 0.91 mm x 0.6 mm; 0.91 x 0.69 x 0.44 mm. Etymology. From the Latin similis, ‘similar,’ referring to the high degree of similarity in external appearance to Mendicula pygmaea . Material examined. CEO 3, Station GT, 54 ° N, 12 ° 24 ’W, 320 m 2 spec.; CEO 3 Station 9, 52° 30 ’N, 14 °W, 300 m 11 spec.; SFO 3 Grab 7, 53°07.77’N, 13 ° 13.37 ’W 252 m 6 spec.; SFO 3 Grab 8, 53°07.77’N, 13 ° 13.37 ’W 252 m 5 spec.; SFO 3 Grab 15, 52° 52.42 ’N, 12 ° 26.52 ’W 382 m 8 spec.; SFO 3 Grab 17, 52° 38.77 ’N, 12 ° 11.08 ’W 330 m 4 spec.; NMWZ. 2001.097, ERT 92 /082A 60 ° 36 ’N, 01° 39 ’E 130–145 m 200 spec.; Distribution. Porcupine Bank, west of Ireland. Depth range 252– 382 m. North Sea oilfields. Depth range 85–161 m (Oliver & Killeen, 2002). Description. Shell minute (maximum size 2 mm), fragile, moderately compressed, colour white; subovate, longer than high (Figure 4); inequilateral, beaks in posterior; very thin, transparent periostracum; sculpture of weak commarginal striae; sulcus absent, posterior flank flattened; umbones inflated, pronounced, prosogyrate; prodissoconch I approximately 150 µm in diameter; lunule indistinct; escutcheon obscure; anterodorsal margin weakly curved, straight in some specimens, anterior broadly rounded; posterior markedly angulate; posterodorsal margin straight, sloping; hinge plate thin, divided into two sections, anterior section thicker, both with irregular granules (Figure 4 C–D, F–H); small cardinal tubercle in the right valve with a corresponding depression in the left valve. Internal anatomy. The anterior adductor muscle is larger than the posterior muscle (Figure 5); both muscles are divided into quick and catch areas; anterior muscle is elongate, while the posterior is round. Single point of mantle fusion occurs beneath the gill axis, forming the posterior aperture; mantle folds thin and extended, particularly the middle fold which is filled with glandular tissue; all mantle folds have a small area of concentric muscle within their tips; centre of the mantle edge has a single strand of radial muscle but is otherwise filled with a large blood space; inner mantle is fold compressed, with a poorly defined rejection tract; on the inner surface of the mantle edge between the inner and middle folds, the area has small underdeveloped lobes or folds; periostracal groove deep. There is no region of glandular tissue underneath the anterior adductor muscle. Each gill has a single demibranch comprised of ten to eleven filaments; ascending lamellae three quarters the length of the descending lamellae; filaments thin with well-developed eu-laterofrontal cilia; gill filaments type 2 (Dufour, 2005); where interfilamentar fusion occurs, the abfrontal areas and blood space remains wide and forms a strong connection; filamentar muscles absent. Labial palps relatively large, triangular. Oesophagus thickened, leading into a very large stomach. Hindgut loops above the stomach and descends around the outside of the posterior adductor muscle. Lateral pouches undivided, unlobed and end in a pointed tip ventrally; there are two tubules leading into the pouches. Kidneys paired, small. Foot short with a well developed heel; ventral portion of the heel contains glandular tissue which continues out to the tip of the foot; heel sagittally grooved; tip of the foot is undifferentiated from the heavily ciliated stem. Differential diagnosis. The sharp angle created by the posterior shell margin in combination with the flattened posterior flank differentiates Adontorhina similis from other Adontorhina species. A . similis is similar to Adontorhina lynnae Valentich Scott, 2000; however, A . lynnae has larger, prominent umbones and a more densely granulated hingeplate. Internally, A . lynnae differs in having almost double the number of gill filaments in each demibranch and the labial palps are far more reduced than those in A . similis . The lateral pouches are larger and develop lobes on the posterior surface while the lateral pouches of A . similis are relatively smooth and simple. Further features which separate A . similis from other species of Adontorhina can be found in Table 1. Remarks. Oliver & Killeen (2002) were the first to recognise the irregular granules in this species but declined to erect a new species. Specimens of Mendicula pygmaea Verrill & Bush, 1898, from the east coast of America were not available for them to examine. Examination of the holotype of M. pygmaea (Figure 6) and fresh material from the northwest Atlantic for the present study confirmed the lack of teeth in M. pygmaea (Figure 7). However, the European specimens, previously identified as M. pygmaea , have irregular granules on the hinge plate (Figure 4 C–D, F–H), a feature which precludes inclusion in Mendicula . Furthermore, examination of the internal anatomy has shown additional differences between these species. The adductor muscles of M . pygmaea are smaller than those in A . similis as are the lateral pouches. The foot of M . pygmaea does not contain as well-developed a heel as that of A . similis . M . pygmaea from the northwest Atlantic remains a valid species, however, the European form can no longer be recognised as M . pygmaea and is here described as Adontorhina similis . Oliver & Killeen (2002) reported that specimens which had previously been recorded as Thyasira subtrigona Jeffreys, 1858, by Hartley (1984) were actually specimens of A. similis (although Oliver & Killeen listed them as Mendicula pygmaea ). The type specimen of Thyasira subtrigona was destroyed (Jeffreys, 1864) and has been considered a nomen dubium by van Aartsen & Carrozza (1997). Other authors have recognized T . subtrigona as a member of the superfamily Galeommatoidea (Bowden & Heppell, 1968; Oliver & Killeen, 2002). : Published as part of Barry, Peter J. & Mccormack, Grace P., 2007, Two new species of Adontorhina Berry, 1947 (Bivalvia: Thyasiridae) from the Porcupine Bank, off the west coast of Ireland, pp. 37-49 in Zootaxa 1526 on pages 42-46, DOI: 10.5281/zenodo.177538 : {"references": ["Oliver, P. G. & Killeen, I. J. (2002) The Thyasiridae (Mollusca: Bivalvia) of the British Continental Shelf and North Sea Oilfields. An identification manual. Cardiff: National Museums and Galleries of Wales. Biomor Reports, Vol. 3 Cardiff, Wales. 73 pp.", "Hartley, J. P. (1984) The benthic ecology of the Forties oil field (North Sea). Journal of Experimental Marine Biology and Ecology, 80, 161 - 195.", "Dufour, S. C. (2005) Gill anatomy and evolution of symbiosis in the bivalve Family Thyasiridae. Biological Bulletin, 208, 200 - 212.", "Verrill, A. E. & Bush, K. J. (1898) Revision of the deep-water mollusca of the Atlantic coast of North America, with descriptions of new genera and species. Proceedings of the United States National Museum, 20, 775 - 901.", "Jeffreys, J. G. (1858) Gleanings in British Conchology. Annals and Magazine of Natural History, 1 (3), 39 - 48.", "Jeffreys, J. G. (1864) Report of the committee appointed for exploring the coasts of Shetland by means of the dredge. Report of the British Association for the Advancement of Science (1863), 70 - 81.", "Van Aartsen, J. J. & Carrozza, F. (1997) On Lasaea pumila (S. V. Wood, 1851 and two new bivalves from European waters: Mancikellia divae n. sp. and Kelliopsis jozinae n. sp. (Bivalvia: Condylocardiidae and Montacutidae). La Conchiglia, 285, 28 - 34.", "Bowden, J. & Heppell, D. (1968) Revised list of British Mollusca 2. Unionacea - Cardiacea. Journal of Conchology, 26, 237 - 272."]} |
format |
Text |
author |
Barry, Peter J. Mccormack, Grace P. |
author_facet |
Barry, Peter J. Mccormack, Grace P. |
author_sort |
Barry, Peter J. |
title |
Adontorhina similis Barry & McCormack, new species |
title_short |
Adontorhina similis Barry & McCormack, new species |
title_full |
Adontorhina similis Barry & McCormack, new species |
title_fullStr |
Adontorhina similis Barry & McCormack, new species |
title_full_unstemmed |
Adontorhina similis Barry & McCormack, new species |
title_sort |
adontorhina similis barry & mccormack, new species |
publisher |
Zenodo |
publishDate |
2007 |
url |
https://dx.doi.org/10.5281/zenodo.5665912 https://zenodo.org/record/5665912 |
long_lat |
ENVELOPE(-13.667,-13.667,53.333,53.333) ENVELOPE(-69.865,-69.865,62.851,62.851) |
geographic |
Porcupine Bank The Heel |
geographic_facet |
Porcupine Bank The Heel |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_relation |
http://publication.plazi.org/id/707BF2132063B65FFFA9FFAD9E31FFE4 http://table.plazi.org/id/50946BF52066B65AFF3EFB629F41FAED http://zoobank.org/176006B5-2A91-4463-A7DD-7D665408B905 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.177538 http://publication.plazi.org/id/707BF2132063B65FFFA9FFAD9E31FFE4 https://dx.doi.org/10.5281/zenodo.177542 https://dx.doi.org/10.5281/zenodo.177543 https://dx.doi.org/10.5281/zenodo.177544 https://dx.doi.org/10.5281/zenodo.177545 http://table.plazi.org/id/50946BF52066B65AFF3EFB629F41FAED http://zoobank.org/176006B5-2A91-4463-A7DD-7D665408B905 https://dx.doi.org/10.5281/zenodo.5665913 https://zenodo.org/communities/biosyslit |
op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.5665912 https://doi.org/10.5281/zenodo.177538 https://doi.org/10.5281/zenodo.177542 https://doi.org/10.5281/zenodo.177543 https://doi.org/10.5281/zenodo.177544 https://doi.org/10.5281/zenodo.177545 https://doi.or |
_version_ |
1766149084238839808 |
spelling |
ftdatacite:10.5281/zenodo.5665912 2023-05-15T17:45:48+02:00 Adontorhina similis Barry & McCormack, new species Barry, Peter J. Mccormack, Grace P. 2007 https://dx.doi.org/10.5281/zenodo.5665912 https://zenodo.org/record/5665912 unknown Zenodo http://publication.plazi.org/id/707BF2132063B65FFFA9FFAD9E31FFE4 http://table.plazi.org/id/50946BF52066B65AFF3EFB629F41FAED http://zoobank.org/176006B5-2A91-4463-A7DD-7D665408B905 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.177538 http://publication.plazi.org/id/707BF2132063B65FFFA9FFAD9E31FFE4 https://dx.doi.org/10.5281/zenodo.177542 https://dx.doi.org/10.5281/zenodo.177543 https://dx.doi.org/10.5281/zenodo.177544 https://dx.doi.org/10.5281/zenodo.177545 http://table.plazi.org/id/50946BF52066B65AFF3EFB629F41FAED http://zoobank.org/176006B5-2A91-4463-A7DD-7D665408B905 https://dx.doi.org/10.5281/zenodo.5665913 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Mollusca Bivalvia Lucinoida Thyasiridae Adontorhina Adontorhina similis Taxonomic treatment article-journal Text ScholarlyArticle 2007 ftdatacite https://doi.org/10.5281/zenodo.5665912 https://doi.org/10.5281/zenodo.177538 https://doi.org/10.5281/zenodo.177542 https://doi.org/10.5281/zenodo.177543 https://doi.org/10.5281/zenodo.177544 https://doi.org/10.5281/zenodo.177545 https://doi.or 2022-02-08T13:29:49Z Adontorhina similis, Barry & McCormack, new species (Figures 4–5) Mendicula pygmaea Oliver & Killeen (2002, p. 56–58, plate 23) Thyasira subtrigona Hartley (1984, p. 192) Type locality. Porcupine Bank, 53 °07.77’N, 13 ° 13.37 ’W, 252 m Eastern Atlantic. Holotype. A complete shell, collected by P.J. Barry, NMINH. 2006.58. Measurements (Length x height x breadth). 1.14 mm x 0.78 mm x 0.62 mm. Paratypes. Three specimens, as holotype, NMINH.2006.64.1– 2. Measurements 1.25 mm x 0.94 mm x 0.6mm; 1.17 mm x 0.91 mm x 0.6 mm; 0.91 x 0.69 x 0.44 mm. Etymology. From the Latin similis, ‘similar,’ referring to the high degree of similarity in external appearance to Mendicula pygmaea . Material examined. CEO 3, Station GT, 54 ° N, 12 ° 24 ’W, 320 m 2 spec.; CEO 3 Station 9, 52° 30 ’N, 14 °W, 300 m 11 spec.; SFO 3 Grab 7, 53°07.77’N, 13 ° 13.37 ’W 252 m 6 spec.; SFO 3 Grab 8, 53°07.77’N, 13 ° 13.37 ’W 252 m 5 spec.; SFO 3 Grab 15, 52° 52.42 ’N, 12 ° 26.52 ’W 382 m 8 spec.; SFO 3 Grab 17, 52° 38.77 ’N, 12 ° 11.08 ’W 330 m 4 spec.; NMWZ. 2001.097, ERT 92 /082A 60 ° 36 ’N, 01° 39 ’E 130–145 m 200 spec.; Distribution. Porcupine Bank, west of Ireland. Depth range 252– 382 m. North Sea oilfields. Depth range 85–161 m (Oliver & Killeen, 2002). Description. Shell minute (maximum size 2 mm), fragile, moderately compressed, colour white; subovate, longer than high (Figure 4); inequilateral, beaks in posterior; very thin, transparent periostracum; sculpture of weak commarginal striae; sulcus absent, posterior flank flattened; umbones inflated, pronounced, prosogyrate; prodissoconch I approximately 150 µm in diameter; lunule indistinct; escutcheon obscure; anterodorsal margin weakly curved, straight in some specimens, anterior broadly rounded; posterior markedly angulate; posterodorsal margin straight, sloping; hinge plate thin, divided into two sections, anterior section thicker, both with irregular granules (Figure 4 C–D, F–H); small cardinal tubercle in the right valve with a corresponding depression in the left valve. Internal anatomy. The anterior adductor muscle is larger than the posterior muscle (Figure 5); both muscles are divided into quick and catch areas; anterior muscle is elongate, while the posterior is round. Single point of mantle fusion occurs beneath the gill axis, forming the posterior aperture; mantle folds thin and extended, particularly the middle fold which is filled with glandular tissue; all mantle folds have a small area of concentric muscle within their tips; centre of the mantle edge has a single strand of radial muscle but is otherwise filled with a large blood space; inner mantle is fold compressed, with a poorly defined rejection tract; on the inner surface of the mantle edge between the inner and middle folds, the area has small underdeveloped lobes or folds; periostracal groove deep. There is no region of glandular tissue underneath the anterior adductor muscle. Each gill has a single demibranch comprised of ten to eleven filaments; ascending lamellae three quarters the length of the descending lamellae; filaments thin with well-developed eu-laterofrontal cilia; gill filaments type 2 (Dufour, 2005); where interfilamentar fusion occurs, the abfrontal areas and blood space remains wide and forms a strong connection; filamentar muscles absent. Labial palps relatively large, triangular. Oesophagus thickened, leading into a very large stomach. Hindgut loops above the stomach and descends around the outside of the posterior adductor muscle. Lateral pouches undivided, unlobed and end in a pointed tip ventrally; there are two tubules leading into the pouches. Kidneys paired, small. Foot short with a well developed heel; ventral portion of the heel contains glandular tissue which continues out to the tip of the foot; heel sagittally grooved; tip of the foot is undifferentiated from the heavily ciliated stem. Differential diagnosis. The sharp angle created by the posterior shell margin in combination with the flattened posterior flank differentiates Adontorhina similis from other Adontorhina species. A . similis is similar to Adontorhina lynnae Valentich Scott, 2000; however, A . lynnae has larger, prominent umbones and a more densely granulated hingeplate. Internally, A . lynnae differs in having almost double the number of gill filaments in each demibranch and the labial palps are far more reduced than those in A . similis . The lateral pouches are larger and develop lobes on the posterior surface while the lateral pouches of A . similis are relatively smooth and simple. Further features which separate A . similis from other species of Adontorhina can be found in Table 1. Remarks. Oliver & Killeen (2002) were the first to recognise the irregular granules in this species but declined to erect a new species. Specimens of Mendicula pygmaea Verrill & Bush, 1898, from the east coast of America were not available for them to examine. Examination of the holotype of M. pygmaea (Figure 6) and fresh material from the northwest Atlantic for the present study confirmed the lack of teeth in M. pygmaea (Figure 7). However, the European specimens, previously identified as M. pygmaea , have irregular granules on the hinge plate (Figure 4 C–D, F–H), a feature which precludes inclusion in Mendicula . Furthermore, examination of the internal anatomy has shown additional differences between these species. The adductor muscles of M . pygmaea are smaller than those in A . similis as are the lateral pouches. The foot of M . pygmaea does not contain as well-developed a heel as that of A . similis . M . pygmaea from the northwest Atlantic remains a valid species, however, the European form can no longer be recognised as M . pygmaea and is here described as Adontorhina similis . Oliver & Killeen (2002) reported that specimens which had previously been recorded as Thyasira subtrigona Jeffreys, 1858, by Hartley (1984) were actually specimens of A. similis (although Oliver & Killeen listed them as Mendicula pygmaea ). The type specimen of Thyasira subtrigona was destroyed (Jeffreys, 1864) and has been considered a nomen dubium by van Aartsen & Carrozza (1997). Other authors have recognized T . subtrigona as a member of the superfamily Galeommatoidea (Bowden & Heppell, 1968; Oliver & Killeen, 2002). : Published as part of Barry, Peter J. & Mccormack, Grace P., 2007, Two new species of Adontorhina Berry, 1947 (Bivalvia: Thyasiridae) from the Porcupine Bank, off the west coast of Ireland, pp. 37-49 in Zootaxa 1526 on pages 42-46, DOI: 10.5281/zenodo.177538 : {"references": ["Oliver, P. G. & Killeen, I. J. (2002) The Thyasiridae (Mollusca: Bivalvia) of the British Continental Shelf and North Sea Oilfields. An identification manual. Cardiff: National Museums and Galleries of Wales. Biomor Reports, Vol. 3 Cardiff, Wales. 73 pp.", "Hartley, J. P. (1984) The benthic ecology of the Forties oil field (North Sea). Journal of Experimental Marine Biology and Ecology, 80, 161 - 195.", "Dufour, S. C. (2005) Gill anatomy and evolution of symbiosis in the bivalve Family Thyasiridae. Biological Bulletin, 208, 200 - 212.", "Verrill, A. E. & Bush, K. J. (1898) Revision of the deep-water mollusca of the Atlantic coast of North America, with descriptions of new genera and species. Proceedings of the United States National Museum, 20, 775 - 901.", "Jeffreys, J. G. (1858) Gleanings in British Conchology. Annals and Magazine of Natural History, 1 (3), 39 - 48.", "Jeffreys, J. G. (1864) Report of the committee appointed for exploring the coasts of Shetland by means of the dredge. Report of the British Association for the Advancement of Science (1863), 70 - 81.", "Van Aartsen, J. J. & Carrozza, F. (1997) On Lasaea pumila (S. V. Wood, 1851 and two new bivalves from European waters: Mancikellia divae n. sp. and Kelliopsis jozinae n. sp. (Bivalvia: Condylocardiidae and Montacutidae). La Conchiglia, 285, 28 - 34.", "Bowden, J. & Heppell, D. (1968) Revised list of British Mollusca 2. Unionacea - Cardiacea. Journal of Conchology, 26, 237 - 272."]} Text Northwest Atlantic DataCite Metadata Store (German National Library of Science and Technology) Porcupine Bank ENVELOPE(-13.667,-13.667,53.333,53.333) The Heel ENVELOPE(-69.865,-69.865,62.851,62.851) |