Megapogon crispatus Jenkin 1908
Megapogon crispatus Jenkin, 1908 (Figs 17 A–H; Table 13) Original description. Jenkin 1908, p. 41, pl. XXVII and XXXVIII, figs 131–136. Type locality. Winter Quarters Bay, Antarctic. Synonym and citations. Megapogon crispatus, Brønsted 1931, p. 32; M. crispatus, Burton 1963, p. 93. Material examined...
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ftzenodo:oai:zenodo.org:5584079 2023-05-15T13:51:03+02:00 Megapogon crispatus Jenkin 1908 Alvizu, Adriana Xavier, Joana R. Rapp, Hans Tore 2019-06-13 https://zenodo.org/record/5584079 https://doi.org/10.5281/zenodo.5584079 unknown info:eu-repo/semantics/altIdentifier/url/http://treatment.plazi.org/id/513F790DFFF0FF90E994D57CFD4E4E5B doi:10.11646/zootaxa.4615.2.1 http://zenodo.org/record/3244638 http://publication.plazi.org/id/AD060175FFD5FFB8E903D13DFF954C64 doi:10.5281/zenodo.3244664 http://zoobank.org/9B9884DA-18D5-4BC9-950F-0436E075AAF8 doi:10.5281/zenodo.5584078 https://zenodo.org/communities/biosyslit https://zenodo.org/record/5584079 https://doi.org/10.5281/zenodo.5584079 oai:zenodo.org:5584079 info:eu-repo/semantics/openAccess Description of new chiactine-bearing sponges provides insights into the higher classification of Calcaronea (Porifera: Calcarea), pp. 201-251 in Zootaxa 4615(2) 238-241 Biodiversity Taxonomy Animalia Porifera Calcarea Leucosolenida Achramorphidae Megapogon Megapogon crispatus info:eu-repo/semantics/other publication-taxonomictreatment 2019 ftzenodo https://doi.org/10.5281/zenodo.558407910.11646/zootaxa.4615.2.110.5281/zenodo.324466410.5281/zenodo.5584078 2023-03-10T18:31:16Z Megapogon crispatus Jenkin, 1908 (Figs 17 A–H; Table 13) Original description. Jenkin 1908, p. 41, pl. XXVII and XXXVIII, figs 131–136. Type locality. Winter Quarters Bay, Antarctic. Synonym and citations. Megapogon crispatus, Brønsted 1931, p. 32; M. crispatus, Burton 1963, p. 93. Material examined. Holotype: BMNH-1907.8.6.131, (two specimens and slides). Winter Quarters, Antarctic, National Antarctic Expedition (HMS Discovery). Morphology. Vase-shaped without fringe but with a well-developed oscular collar. Colour whitish in ethanol. Surface villose due to long diactines that cross the surface (Fig 17 A–B). Size of the fragment 2.4–3.1 mm long, 1.5–1.8 mm wide and 0.1 mm thick. Aquiferous system is leuconoid with spherical choanocyte chambers of similar size than inhalant cavities (Fig 17C). Skeleton. Skeleton inarticulated and composed of diactines, microdiactines, triactines and chiactines. Tetractines are found only in the oscular area (Figs 17B, 17D). Cortical skeleton composed of tangential triactines (Fig 17E) and of large projecting diactines which are bent towards the proximal end (Figs 17 B–E, 17G). Two types of microdiactines with spines are placed irregularly on the surface (Fig 17E). These microdiactines are also present amongst the atrial spicules, and around the choanocyte chambers (Figs 17F). Chiactines and few triactines form the atrial skeleton, with their unpaired actines pointing to the surface, and the paired actines giving support to the atrial wall. Tri- and tetractines of the same size, laid tangentially with the unpaired actines pointing downwards, are forming the oscular collar (Fig 17D). The oscular fringe is mainly composed of slightly shorter diactines, and by diactines similar to those found in the cortical skeleton but longer and thinner. It was not possible to measure the spicules from the oscular region, because they were broken or not easily visible in the sections. Spicules. Diactines: large and curved towards the distal end which has a knob. Proximal end hastate (Figs 17 A–B, ... Other/Unknown Material Antarc* Antarctic Zenodo Antarctic Burton ENVELOPE(166.733,166.733,-72.550,-72.550) Winter Quarters Bay ENVELOPE(166.617,166.617,-77.850,-77.850) |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Porifera Calcarea Leucosolenida Achramorphidae Megapogon Megapogon crispatus |
spellingShingle |
Biodiversity Taxonomy Animalia Porifera Calcarea Leucosolenida Achramorphidae Megapogon Megapogon crispatus Alvizu, Adriana Xavier, Joana R. Rapp, Hans Tore Megapogon crispatus Jenkin 1908 |
topic_facet |
Biodiversity Taxonomy Animalia Porifera Calcarea Leucosolenida Achramorphidae Megapogon Megapogon crispatus |
description |
Megapogon crispatus Jenkin, 1908 (Figs 17 A–H; Table 13) Original description. Jenkin 1908, p. 41, pl. XXVII and XXXVIII, figs 131–136. Type locality. Winter Quarters Bay, Antarctic. Synonym and citations. Megapogon crispatus, Brønsted 1931, p. 32; M. crispatus, Burton 1963, p. 93. Material examined. Holotype: BMNH-1907.8.6.131, (two specimens and slides). Winter Quarters, Antarctic, National Antarctic Expedition (HMS Discovery). Morphology. Vase-shaped without fringe but with a well-developed oscular collar. Colour whitish in ethanol. Surface villose due to long diactines that cross the surface (Fig 17 A–B). Size of the fragment 2.4–3.1 mm long, 1.5–1.8 mm wide and 0.1 mm thick. Aquiferous system is leuconoid with spherical choanocyte chambers of similar size than inhalant cavities (Fig 17C). Skeleton. Skeleton inarticulated and composed of diactines, microdiactines, triactines and chiactines. Tetractines are found only in the oscular area (Figs 17B, 17D). Cortical skeleton composed of tangential triactines (Fig 17E) and of large projecting diactines which are bent towards the proximal end (Figs 17 B–E, 17G). Two types of microdiactines with spines are placed irregularly on the surface (Fig 17E). These microdiactines are also present amongst the atrial spicules, and around the choanocyte chambers (Figs 17F). Chiactines and few triactines form the atrial skeleton, with their unpaired actines pointing to the surface, and the paired actines giving support to the atrial wall. Tri- and tetractines of the same size, laid tangentially with the unpaired actines pointing downwards, are forming the oscular collar (Fig 17D). The oscular fringe is mainly composed of slightly shorter diactines, and by diactines similar to those found in the cortical skeleton but longer and thinner. It was not possible to measure the spicules from the oscular region, because they were broken or not easily visible in the sections. Spicules. Diactines: large and curved towards the distal end which has a knob. Proximal end hastate (Figs 17 A–B, ... |
format |
Other/Unknown Material |
author |
Alvizu, Adriana Xavier, Joana R. Rapp, Hans Tore |
author_facet |
Alvizu, Adriana Xavier, Joana R. Rapp, Hans Tore |
author_sort |
Alvizu, Adriana |
title |
Megapogon crispatus Jenkin 1908 |
title_short |
Megapogon crispatus Jenkin 1908 |
title_full |
Megapogon crispatus Jenkin 1908 |
title_fullStr |
Megapogon crispatus Jenkin 1908 |
title_full_unstemmed |
Megapogon crispatus Jenkin 1908 |
title_sort |
megapogon crispatus jenkin 1908 |
publishDate |
2019 |
url |
https://zenodo.org/record/5584079 https://doi.org/10.5281/zenodo.5584079 |
long_lat |
ENVELOPE(166.733,166.733,-72.550,-72.550) ENVELOPE(166.617,166.617,-77.850,-77.850) |
geographic |
Antarctic Burton Winter Quarters Bay |
geographic_facet |
Antarctic Burton Winter Quarters Bay |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Description of new chiactine-bearing sponges provides insights into the higher classification of Calcaronea (Porifera: Calcarea), pp. 201-251 in Zootaxa 4615(2) 238-241 |
op_relation |
info:eu-repo/semantics/altIdentifier/url/http://treatment.plazi.org/id/513F790DFFF0FF90E994D57CFD4E4E5B doi:10.11646/zootaxa.4615.2.1 http://zenodo.org/record/3244638 http://publication.plazi.org/id/AD060175FFD5FFB8E903D13DFF954C64 doi:10.5281/zenodo.3244664 http://zoobank.org/9B9884DA-18D5-4BC9-950F-0436E075AAF8 doi:10.5281/zenodo.5584078 https://zenodo.org/communities/biosyslit https://zenodo.org/record/5584079 https://doi.org/10.5281/zenodo.5584079 oai:zenodo.org:5584079 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.558407910.11646/zootaxa.4615.2.110.5281/zenodo.324466410.5281/zenodo.5584078 |
_version_ |
1766254635932188672 |