Aktedrilus Knollner 1935
Aktedrilus species producing spermatophores (Figure 4) Among phallodrilines, only a few Aktedrilus species, with or without spermathecae, transfer sperm by attaching spermatophores to the partner's body wall. These species were initially classified in the genus Bacescuella Hrabě, 197...
Main Authors: | , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Zenodo
2018
|
Subjects: | |
Online Access: | https://dx.doi.org/10.5281/zenodo.5951346 https://zenodo.org/record/5951346 |
id |
ftdatacite:10.5281/zenodo.5951346 |
---|---|
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 Annelida Clitellata Haplotaxida Naididae Aktedrilus |
spellingShingle |
Biodiversity Taxonomy Animalia Annelida Clitellata Haplotaxida Naididae Aktedrilus Rodriguez, Pilar Fend, Steven V. Aktedrilus Knollner 1935 |
topic_facet |
Biodiversity Taxonomy Animalia Annelida Clitellata Haplotaxida Naididae Aktedrilus |
description |
Aktedrilus species producing spermatophores (Figure 4) Among phallodrilines, only a few Aktedrilus species, with or without spermathecae, transfer sperm by attaching spermatophores to the partner's body wall. These species were initially classified in the genus Bacescuella Hrabě, 1973, but that genus was placed in synonymy with Aktedrilus by Erséus (1987). At present, six Aktedrilus species produce spermatophores; these are dome-shaped, on short stalks or directly attached to the body wall (Fig. 4A). Placement is either on the dorsal or ventral sides of the body wall, in the clitellar region. The single, dorsal spermatheca is absent in four of these species, but a small spermatheca is present in A. arcticus and A. parvithecatus , and can be full of sperm. Erséus (1978) suggested that this has little or no functional relevance; some specimens can bear up to 3 or 4 spermatophores, and the author suggests that the presence of spermathecae can be just a relic of ancestral forms, in which spermatophores had not evolved. Aktedrilus species producing spermatophores show a different degree of development of glandular tissues in the ectal part of the male duct. The conspicuous, glandular, pendant organ in the ectal section of the atrium may function both in the formation of spermatophores and as copulatory organ related to the attachment of spermatophores during mating (Fig. 4B–F). Although referred to as a 'penis' in some species, this organ is not associated with conspicuous musculature. The copulatory organ is enclosed in a bulbous male sac (usually described as a "penial sac"), which is the ental section of the copulatory bursa. In A . labeosus and A. mediterraneus , the copulatory organ is encircled by a large glandular ring or a pair of lips (Fig. 4D–F). In other species, such as A. arcticus, a very thick epithelium of the so-called 'penis' (Fig. 4B,C) also suggests a glandular function. Most Aktedrilus species have some form of male sac, but in the species producing spermatophores, the ectal end of atrium is joined to a more or less enlarged and folded copulatory bursa (long in A. labeosus , Fig. 4D). : Published as part of Rodriguez, Pilar & Fend, Steven V., 2018, On spermatophore-producing aquatic microdrile oligochaetes (Annelida: Clitellata), pp. 41-60 in Zootaxa 4497 (1) on page 50, DOI: 10.11646/zootaxa.4497.1.3, http://zenodo.org/record/1451092 : {"references": ["Hrabe, S. (1973) A contribution to the knowledge of marine Oligochaeta, mainly from the Black Sea. T ravaux du Museum National d'Histoire Naturelle \" Grigore Antipa \", 13, 27 - 38.", "Erseus, C. (1978) Two species of the little-known genus Bacescuella (Hrabe) (Oligochaeta, Tubificidae) from the North Atlantic. Zoologica Scripta, 7, 263 - 269. https: // doi. org / 10.1111 / j. 1463 - 6409.1978. tb 00609. x"]} |
format |
Text |
author |
Rodriguez, Pilar Fend, Steven V. |
author_facet |
Rodriguez, Pilar Fend, Steven V. |
author_sort |
Rodriguez, Pilar |
title |
Aktedrilus Knollner 1935 |
title_short |
Aktedrilus Knollner 1935 |
title_full |
Aktedrilus Knollner 1935 |
title_fullStr |
Aktedrilus Knollner 1935 |
title_full_unstemmed |
Aktedrilus Knollner 1935 |
title_sort |
aktedrilus knollner 1935 |
publisher |
Zenodo |
publishDate |
2018 |
url |
https://dx.doi.org/10.5281/zenodo.5951346 https://zenodo.org/record/5951346 |
long_lat |
ENVELOPE(-56.720,-56.720,-63.529,-63.529) |
geographic |
Rodriguez |
geographic_facet |
Rodriguez |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://zenodo.org/record/1451092 http://publication.plazi.org/id/A15B6D13FFDFC84B1A7BD164FF926976 http://zoobank.org/11725C60-E463-4EB3-A96A-34CEF56923B8 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.4497.1.3 http://zenodo.org/record/1451092 http://publication.plazi.org/id/A15B6D13FFDFC84B1A7BD164FF926976 https://dx.doi.org/10.5281/zenodo.1451102 http://zoobank.org/11725C60-E463-4EB3-A96A-34CEF56923B8 https://dx.doi.org/10.5281/zenodo.5951345 https://zenodo.org/communities/biosyslit |
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.5951346 https://doi.org/10.11646/zootaxa.4497.1.3 https://doi.org/10.5281/zenodo.1451102 https://doi.org/10.5281/zenodo.5951345 |
_version_ |
1766137153159430144 |
spelling |
ftdatacite:10.5281/zenodo.5951346 2023-05-15T17:37:18+02:00 Aktedrilus Knollner 1935 Rodriguez, Pilar Fend, Steven V. 2018 https://dx.doi.org/10.5281/zenodo.5951346 https://zenodo.org/record/5951346 unknown Zenodo http://zenodo.org/record/1451092 http://publication.plazi.org/id/A15B6D13FFDFC84B1A7BD164FF926976 http://zoobank.org/11725C60-E463-4EB3-A96A-34CEF56923B8 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.4497.1.3 http://zenodo.org/record/1451092 http://publication.plazi.org/id/A15B6D13FFDFC84B1A7BD164FF926976 https://dx.doi.org/10.5281/zenodo.1451102 http://zoobank.org/11725C60-E463-4EB3-A96A-34CEF56923B8 https://dx.doi.org/10.5281/zenodo.5951345 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 Annelida Clitellata Haplotaxida Naididae Aktedrilus article-journal ScholarlyArticle Text Taxonomic treatment 2018 ftdatacite https://doi.org/10.5281/zenodo.5951346 https://doi.org/10.11646/zootaxa.4497.1.3 https://doi.org/10.5281/zenodo.1451102 https://doi.org/10.5281/zenodo.5951345 2022-03-10T16:43:00Z Aktedrilus species producing spermatophores (Figure 4) Among phallodrilines, only a few Aktedrilus species, with or without spermathecae, transfer sperm by attaching spermatophores to the partner's body wall. These species were initially classified in the genus Bacescuella Hrabě, 1973, but that genus was placed in synonymy with Aktedrilus by Erséus (1987). At present, six Aktedrilus species produce spermatophores; these are dome-shaped, on short stalks or directly attached to the body wall (Fig. 4A). Placement is either on the dorsal or ventral sides of the body wall, in the clitellar region. The single, dorsal spermatheca is absent in four of these species, but a small spermatheca is present in A. arcticus and A. parvithecatus , and can be full of sperm. Erséus (1978) suggested that this has little or no functional relevance; some specimens can bear up to 3 or 4 spermatophores, and the author suggests that the presence of spermathecae can be just a relic of ancestral forms, in which spermatophores had not evolved. Aktedrilus species producing spermatophores show a different degree of development of glandular tissues in the ectal part of the male duct. The conspicuous, glandular, pendant organ in the ectal section of the atrium may function both in the formation of spermatophores and as copulatory organ related to the attachment of spermatophores during mating (Fig. 4B–F). Although referred to as a 'penis' in some species, this organ is not associated with conspicuous musculature. The copulatory organ is enclosed in a bulbous male sac (usually described as a "penial sac"), which is the ental section of the copulatory bursa. In A . labeosus and A. mediterraneus , the copulatory organ is encircled by a large glandular ring or a pair of lips (Fig. 4D–F). In other species, such as A. arcticus, a very thick epithelium of the so-called 'penis' (Fig. 4B,C) also suggests a glandular function. Most Aktedrilus species have some form of male sac, but in the species producing spermatophores, the ectal end of atrium is joined to a more or less enlarged and folded copulatory bursa (long in A. labeosus , Fig. 4D). : Published as part of Rodriguez, Pilar & Fend, Steven V., 2018, On spermatophore-producing aquatic microdrile oligochaetes (Annelida: Clitellata), pp. 41-60 in Zootaxa 4497 (1) on page 50, DOI: 10.11646/zootaxa.4497.1.3, http://zenodo.org/record/1451092 : {"references": ["Hrabe, S. (1973) A contribution to the knowledge of marine Oligochaeta, mainly from the Black Sea. T ravaux du Museum National d'Histoire Naturelle \" Grigore Antipa \", 13, 27 - 38.", "Erseus, C. (1978) Two species of the little-known genus Bacescuella (Hrabe) (Oligochaeta, Tubificidae) from the North Atlantic. Zoologica Scripta, 7, 263 - 269. https: // doi. org / 10.1111 / j. 1463 - 6409.1978. tb 00609. x"]} Text North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Rodriguez ENVELOPE(-56.720,-56.720,-63.529,-63.529) |