Schizotricha falcata Pena Cantero 1998
Schizotricha falcata Peña Cantero, 1998 (Fig. 2D–H) Material examined. TAN 0602/447 , one stem 350 mm high, with gonothecae (NIWA 144248). Measurements (in µm). Hydrotheca : length of abcauline wall from 150 µm at 1 st internode to 240 µm at 12 th. Gonothecae : length 1200, maximum diameter 520, dia...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Zenodo
2021
|
Subjects: | |
Online Access: | https://dx.doi.org/10.5281/zenodo.4736753 https://zenodo.org/record/4736753 |
id |
ftdatacite:10.5281/zenodo.4736753 |
---|---|
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 Cnidaria Hydrozoa Leptothecata Halopterididae Schizotricha Schizotricha falcata |
spellingShingle |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Halopterididae Schizotricha Schizotricha falcata Peña Cantero, Álvaro L. Schizotricha falcata Pena Cantero 1998 |
topic_facet |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Halopterididae Schizotricha Schizotricha falcata |
description |
Schizotricha falcata Peña Cantero, 1998 (Fig. 2D–H) Material examined. TAN 0602/447 , one stem 350 mm high, with gonothecae (NIWA 144248). Measurements (in µm). Hydrotheca : length of abcauline wall from 150 µm at 1 st internode to 240 µm at 12 th. Gonothecae : length 1200, maximum diameter 520, diameter at aperture 270. Hydrocladial internodes : from 900 at 1 st internode to 680 at distal ones. Nematocysts : larger microbasic mastigophores 19–21.5 x 6.5–7, smaller 6 x 2. Remarks. The presence of an ahydrothecate internode following hydrocladial and cauline apophyses (Fig. 2D), initially prompted me to consider this material different from that of S. falcata , in which no such ahydrothecate internodes had been reported (cf. Peña Cantero 1998; Peña Cantero & Vervoort 1999). Nevertheless, I have examined some slides from the holotype and found that, at least, there are indications that such internodes might develop after the apophyses; a little, but distinct, perisarc indentation marking what would be the limit between an apophysis and an ahydrothecate internode is usually present (Fig. 2 G-H). A much more careful study of the present material revealed that the presence of an ahydrothecate internode not clearly demarcated from the apophyses was actually the rule; a clearly defined ahydrothecate internode was observed only on a few occasions. Thus, the only difference with previous material of S. falcata is related to the number of infrahydrothecal nematothecae on the cauline internodes: two to three in the holotype (on one occasion one), but only one in this material (two on one occasion). The hydrocladial forked internodes are also provided with a slightly higher number of infrahydrothecal nematothecae (two to three in the holotype, but one or two in the present material). This minor difference in the number of infrahydrothecal nematothecae does not seem important enough and, accordingly, I assign the present material to S. falcata . Present material also agrees with the concept of the species in the presence of unbranched stems, the size and shape of the hydrotheca (abcauline length increasing along hydrocladium, from 150 µm at 1 st internode to 240 µm at 12 th) and gonotheca (1200 µm long, 520 µm in maximum diameter and 270 µm at aperture, sickle-shaped and with two nematothecae) and the peculiar hydrocladial branching. In the present material, up to fifth-order hydrocladia are formed in a typical way, from the first internode of the subsequent lower-order hydrocladia, as usually occurs in other species of the genus. However, the primary hydrocladium also gives rise to another secondary hydrocladium in its fifth internode (this second-order hydrocladium was also observed giving rise to a third-order one at its first internode), as also do the first second-order, third-order and fourth-order hydrocladia. Ecology and distribution. The material, which represents the first record of the species from the area of study, was collected at depths between 74 and 130 m off Young Island; gonothecae in March. The species has been recently reported from the nearby Ross Sea (Peña Cantero 2017). : Published as part of Peña Cantero, Álvaro L., 2021, Additions to knowledge of the biodiversity of benthic hydroids (Cnidaria: Hydrozoa) in the Balleny Islands (Antarctica), pp. 321-336 in Zootaxa 4966 (3) on page 330, DOI: 10.11646/zootaxa.4966.3.4, http://zenodo.org/record/4736691 : {"references": ["Pena Cantero, A. L. (2017) Benthic hydroids (Cnidaria, Hydrozoa) from the Ross Sea (Antarctica) collected by the New Zealand Antarctic expedition BioRoss 2004 with RV Tangaroa. Zootaxa, 4293 (1), 1 - 65. https: // doi. org / 10.11646 / zootaxa. 4293.1.1"]} |
format |
Text |
author |
Peña Cantero, Álvaro L. |
author_facet |
Peña Cantero, Álvaro L. |
author_sort |
Peña Cantero, Álvaro L. |
title |
Schizotricha falcata Pena Cantero 1998 |
title_short |
Schizotricha falcata Pena Cantero 1998 |
title_full |
Schizotricha falcata Pena Cantero 1998 |
title_fullStr |
Schizotricha falcata Pena Cantero 1998 |
title_full_unstemmed |
Schizotricha falcata Pena Cantero 1998 |
title_sort |
schizotricha falcata pena cantero 1998 |
publisher |
Zenodo |
publishDate |
2021 |
url |
https://dx.doi.org/10.5281/zenodo.4736753 https://zenodo.org/record/4736753 |
long_lat |
ENVELOPE(40.562,40.562,63.490,63.490) ENVELOPE(-66.783,-66.783,-68.867,-68.867) ENVELOPE(162.400,162.400,-66.417,-66.417) |
geographic |
Antarctic Ross Sea Balleny Islands New Zealand Pena Sickle Young Island |
geographic_facet |
Antarctic Ross Sea Balleny Islands New Zealand Pena Sickle Young Island |
genre |
Antarc* Antarctic Antarctica Balleny Islands Ross Sea Young Island |
genre_facet |
Antarc* Antarctic Antarctica Balleny Islands Ross Sea Young Island |
op_relation |
http://zenodo.org/record/4736691 http://publication.plazi.org/id/1129BC50FFF22308FFC70D70FFD4FFDF http://zoobank.org/F4CABF6C-1993-4112-A03E-4DBF708BB025 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.4966.3.4 http://zenodo.org/record/4736691 http://publication.plazi.org/id/1129BC50FFF22308FFC70D70FFD4FFDF https://dx.doi.org/10.5281/zenodo.4736697 http://zoobank.org/F4CABF6C-1993-4112-A03E-4DBF708BB025 https://dx.doi.org/10.5281/zenodo.4736752 https://zenodo.org/communities/biosyslit |
op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.4736753 https://doi.org/10.11646/zootaxa.4966.3.4 https://doi.org/10.5281/zenodo.4736697 https://doi.org/10.5281/zenodo.4736752 |
_version_ |
1766260081107664896 |
spelling |
ftdatacite:10.5281/zenodo.4736753 2023-05-15T13:54:21+02:00 Schizotricha falcata Pena Cantero 1998 Peña Cantero, Álvaro L. 2021 https://dx.doi.org/10.5281/zenodo.4736753 https://zenodo.org/record/4736753 unknown Zenodo http://zenodo.org/record/4736691 http://publication.plazi.org/id/1129BC50FFF22308FFC70D70FFD4FFDF http://zoobank.org/F4CABF6C-1993-4112-A03E-4DBF708BB025 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.4966.3.4 http://zenodo.org/record/4736691 http://publication.plazi.org/id/1129BC50FFF22308FFC70D70FFD4FFDF https://dx.doi.org/10.5281/zenodo.4736697 http://zoobank.org/F4CABF6C-1993-4112-A03E-4DBF708BB025 https://dx.doi.org/10.5281/zenodo.4736752 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Halopterididae Schizotricha Schizotricha falcata Taxonomic treatment article-journal Text ScholarlyArticle 2021 ftdatacite https://doi.org/10.5281/zenodo.4736753 https://doi.org/10.11646/zootaxa.4966.3.4 https://doi.org/10.5281/zenodo.4736697 https://doi.org/10.5281/zenodo.4736752 2022-02-09T14:08:57Z Schizotricha falcata Peña Cantero, 1998 (Fig. 2D–H) Material examined. TAN 0602/447 , one stem 350 mm high, with gonothecae (NIWA 144248). Measurements (in µm). Hydrotheca : length of abcauline wall from 150 µm at 1 st internode to 240 µm at 12 th. Gonothecae : length 1200, maximum diameter 520, diameter at aperture 270. Hydrocladial internodes : from 900 at 1 st internode to 680 at distal ones. Nematocysts : larger microbasic mastigophores 19–21.5 x 6.5–7, smaller 6 x 2. Remarks. The presence of an ahydrothecate internode following hydrocladial and cauline apophyses (Fig. 2D), initially prompted me to consider this material different from that of S. falcata , in which no such ahydrothecate internodes had been reported (cf. Peña Cantero 1998; Peña Cantero & Vervoort 1999). Nevertheless, I have examined some slides from the holotype and found that, at least, there are indications that such internodes might develop after the apophyses; a little, but distinct, perisarc indentation marking what would be the limit between an apophysis and an ahydrothecate internode is usually present (Fig. 2 G-H). A much more careful study of the present material revealed that the presence of an ahydrothecate internode not clearly demarcated from the apophyses was actually the rule; a clearly defined ahydrothecate internode was observed only on a few occasions. Thus, the only difference with previous material of S. falcata is related to the number of infrahydrothecal nematothecae on the cauline internodes: two to three in the holotype (on one occasion one), but only one in this material (two on one occasion). The hydrocladial forked internodes are also provided with a slightly higher number of infrahydrothecal nematothecae (two to three in the holotype, but one or two in the present material). This minor difference in the number of infrahydrothecal nematothecae does not seem important enough and, accordingly, I assign the present material to S. falcata . Present material also agrees with the concept of the species in the presence of unbranched stems, the size and shape of the hydrotheca (abcauline length increasing along hydrocladium, from 150 µm at 1 st internode to 240 µm at 12 th) and gonotheca (1200 µm long, 520 µm in maximum diameter and 270 µm at aperture, sickle-shaped and with two nematothecae) and the peculiar hydrocladial branching. In the present material, up to fifth-order hydrocladia are formed in a typical way, from the first internode of the subsequent lower-order hydrocladia, as usually occurs in other species of the genus. However, the primary hydrocladium also gives rise to another secondary hydrocladium in its fifth internode (this second-order hydrocladium was also observed giving rise to a third-order one at its first internode), as also do the first second-order, third-order and fourth-order hydrocladia. Ecology and distribution. The material, which represents the first record of the species from the area of study, was collected at depths between 74 and 130 m off Young Island; gonothecae in March. The species has been recently reported from the nearby Ross Sea (Peña Cantero 2017). : Published as part of Peña Cantero, Álvaro L., 2021, Additions to knowledge of the biodiversity of benthic hydroids (Cnidaria: Hydrozoa) in the Balleny Islands (Antarctica), pp. 321-336 in Zootaxa 4966 (3) on page 330, DOI: 10.11646/zootaxa.4966.3.4, http://zenodo.org/record/4736691 : {"references": ["Pena Cantero, A. L. (2017) Benthic hydroids (Cnidaria, Hydrozoa) from the Ross Sea (Antarctica) collected by the New Zealand Antarctic expedition BioRoss 2004 with RV Tangaroa. Zootaxa, 4293 (1), 1 - 65. https: // doi. org / 10.11646 / zootaxa. 4293.1.1"]} Text Antarc* Antarctic Antarctica Balleny Islands Ross Sea Young Island DataCite Metadata Store (German National Library of Science and Technology) Antarctic Ross Sea Balleny Islands New Zealand Pena ENVELOPE(40.562,40.562,63.490,63.490) Sickle ENVELOPE(-66.783,-66.783,-68.867,-68.867) Young Island ENVELOPE(162.400,162.400,-66.417,-66.417) |