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Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species

Rasmussen, Jan Audun ; Eriksson, Mats E. LU and Lindskog, Anders LU (2021) In European Journal of Taxonomy 774. p.106-134
Abstract

Drepanoistodus basiovalis (Sergeeva, 1963) is a common conodont species in Middle Ordovician strata of Baltica. For many years it has been widely accepted that the species encompasses a wide range of morphological plasticity. Hence, several different morphotypes that significantly deviate from the holotype have nonetheless been included in the broad species concept. In this study, we performed a detailed taxonomical study on 112 predominantly well-preserved specimens (geniculate elements) from the St. Petersburg region of Russia; 37 of these were selected for morphometric analyses together with 21 well-illustrated specimens from the published literature. The results demonstrate that, among the morphotypes that share some characteristics... (More)

Drepanoistodus basiovalis (Sergeeva, 1963) is a common conodont species in Middle Ordovician strata of Baltica. For many years it has been widely accepted that the species encompasses a wide range of morphological plasticity. Hence, several different morphotypes that significantly deviate from the holotype have nonetheless been included in the broad species concept. In this study, we performed a detailed taxonomical study on 112 predominantly well-preserved specimens (geniculate elements) from the St. Petersburg region of Russia; 37 of these were selected for morphometric analyses together with 21 well-illustrated specimens from the published literature. The results demonstrate that, among the morphotypes that share some characteristics with D. basiovalis sensu lato, at least five species can be readily distinguished. Hence, three new species – Drepanoistodus iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. – are here added to the previously known D. basiovalis and D. contractus (Lindström, 1955). In addition, some specimens were left under open nomenclature and assigned to Drepanoistodus aff. basiovalis and D. cf. suberectus (Branson & Mehl, 1933). In order to objectively compare the Drepanoistodus taxa and test the validity of the new species, we performed a Principal Component Analysis combined with non-parametric (PERMANOVA) tests based on 21 morphological characters.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Baltica, Conodont, Drepanoistodus, New species, Ordovician
in
European Journal of Taxonomy
volume
774
pages
29 pages
publisher
Museum National d'Histoire Naturelle
external identifiers
  • scopus:85117187350
ISSN
2118-9773
DOI
10.5852/ejt.2021.774.1533
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021, Museum National d'Histoire Naturelle. All rights reserved.
id
6994ba26-47fe-4785-a8bd-7b2b2b01b6c9
date added to LUP
2021-11-15 09:50:54
date last changed
2022-04-27 05:38:15
@article{6994ba26-47fe-4785-a8bd-7b2b2b01b6c9,
  abstract     = {{<p>Drepanoistodus basiovalis (Sergeeva, 1963) is a common conodont species in Middle Ordovician strata of Baltica. For many years it has been widely accepted that the species encompasses a wide range of morphological plasticity. Hence, several different morphotypes that significantly deviate from the holotype have nonetheless been included in the broad species concept. In this study, we performed a detailed taxonomical study on 112 predominantly well-preserved specimens (geniculate elements) from the St. Petersburg region of Russia; 37 of these were selected for morphometric analyses together with 21 well-illustrated specimens from the published literature. The results demonstrate that, among the morphotypes that share some characteristics with D. basiovalis sensu lato, at least five species can be readily distinguished. Hence, three new species – Drepanoistodus iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. – are here added to the previously known D. basiovalis and D. contractus (Lindström, 1955). In addition, some specimens were left under open nomenclature and assigned to Drepanoistodus aff. basiovalis and D. cf. suberectus (Branson &amp; Mehl, 1933). In order to objectively compare the Drepanoistodus taxa and test the validity of the new species, we performed a Principal Component Analysis combined with non-parametric (PERMANOVA) tests based on 21 morphological characters.</p>}},
  author       = {{Rasmussen, Jan Audun and Eriksson, Mats E. and Lindskog, Anders}},
  issn         = {{2118-9773}},
  keywords     = {{Baltica; Conodont; Drepanoistodus; New species; Ordovician}},
  language     = {{eng}},
  pages        = {{106--134}},
  publisher    = {{Museum National d'Histoire Naturelle}},
  series       = {{European Journal of Taxonomy}},
  title        = {{Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species}},
  url          = {{http://dx.doi.org/10.5852/ejt.2021.774.1533}},
  doi          = {{10.5852/ejt.2021.774.1533}},
  volume       = {{774}},
  year         = {{2021}},
}