First report of non-marine ostracods (Crustacea, Ostracoda) from the Dahlak Archipelago (Eritrea), with the description of two new species
The information on Recent non-marine ostracod faunas of the north-eastern part of the Afrotropical region is still limited. Here we report the first record of ostracods from the Dahlak Archipelago, a group of small islands located in the southern part of the Red Sea off the Eritrean coast. Specimen...
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PAGEPress Publications
2025-02-01
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| Series: | Journal of Limnology |
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| Online Access: | https://www.jlimnol.it/jlimnol/article/view/2209 |
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| author | Giampaolo Rossetti Ilaria Mazzini Giorgio Chiozzi Luca Vecchioni Federico Marrone |
| author_facet | Giampaolo Rossetti Ilaria Mazzini Giorgio Chiozzi Luca Vecchioni Federico Marrone |
| author_sort | Giampaolo Rossetti |
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The information on Recent non-marine ostracod faunas of the north-eastern part of the Afrotropical region is still limited. Here we report the first record of ostracods from the Dahlak Archipelago, a group of small islands located in the southern part of the Red Sea off the Eritrean coast. Specimens were obtained by hatching in the laboratory of diapausing eggs occurring in dried mud collected in temporary freshwater ponds, following the so-called “Sars’ method”. A total of five species were found, including two species new to science, of which four belong to the family Cyprididae (Cypris galefensis, Plesiocypridopsis newtoni, Heterocypris sp., and Chrissia martensi n.sp.) and one to the family Ilyocyprididae (Ilyocypris dahlakensis n.sp.). A detailed description of the morphology of valves and soft parts is given, and COX1 sequences were obtained for four species. Cypris galefensis was so far only known for its type locality in Somalia with a population containing both males and females, whereas our samples consisted exclusively of females. Plesiocypridopsis newtoni, a species characterised by a wide geographic distribution and previously known to occur also in the Afrotropical region, shows marked variability in the prehensile palps of males, as evidenced by comparing the specimens from this study with descriptions available in the literature. The genus Heterocypris (with 15 species) and the genera of the two new species described here, Chrissia (with 17 species) and Ilyocypris (with four species), have been previously reported from this biogeographic region as well. The specimens analysed of Chrissia martensi n.sp. were all females, none of which had sperm inside the carapace, indicating the possibility of parthenogenetic reproduction in this species. A peculiar sexual dimorphism in the valve morphology characterises Ilyocypris dahlakensis n.sp., with females having a straight posterior margin, forming a right angle at the ventral anterior edge. Rehydration of dry sediments collected from arid areas where wet periods are short and often unpredictable has proven to be a successful method for describing aquatic invertebrate biodiversity.
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| format | Article |
| id | doaj-art-099760d61e1c43b8ac580c514e422df0 |
| institution | Kabale University |
| issn | 1129-5767 1723-8633 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | PAGEPress Publications |
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| series | Journal of Limnology |
| spelling | doaj-art-099760d61e1c43b8ac580c514e422df02025-02-11T02:35:56ZengPAGEPress PublicationsJournal of Limnology1129-57671723-86332025-02-018410.4081/jlimnol.2025.2209First report of non-marine ostracods (Crustacea, Ostracoda) from the Dahlak Archipelago (Eritrea), with the description of two new speciesGiampaolo Rossetti0https://orcid.org/0000-0002-8136-6965Ilaria Mazzini1https://orcid.org/0000-0003-2164-7826Giorgio Chiozzi2https://orcid.org/0000-0002-1811-0254Luca Vecchioni3https://orcid.org/0000-0003-4325-9728Federico Marrone4https://orcid.org/0000-0002-4730-0452Department of Chemistry, Life Science and Environmental Sustainability, University of ParmaCNR-IGAG, Area della Ricerca di Roma 1, Montelibretti (RM)Milan Natural History Museum, MilanDepartment of Biological, Chemical and Pharmaceutical Sciences and Technologies, Section of Zoology, University of PalermoDepartment of Biological, Chemical and Pharmaceutical Sciences and Technologies, Section of Zoology, University of Palermo The information on Recent non-marine ostracod faunas of the north-eastern part of the Afrotropical region is still limited. Here we report the first record of ostracods from the Dahlak Archipelago, a group of small islands located in the southern part of the Red Sea off the Eritrean coast. Specimens were obtained by hatching in the laboratory of diapausing eggs occurring in dried mud collected in temporary freshwater ponds, following the so-called “Sars’ method”. A total of five species were found, including two species new to science, of which four belong to the family Cyprididae (Cypris galefensis, Plesiocypridopsis newtoni, Heterocypris sp., and Chrissia martensi n.sp.) and one to the family Ilyocyprididae (Ilyocypris dahlakensis n.sp.). A detailed description of the morphology of valves and soft parts is given, and COX1 sequences were obtained for four species. Cypris galefensis was so far only known for its type locality in Somalia with a population containing both males and females, whereas our samples consisted exclusively of females. Plesiocypridopsis newtoni, a species characterised by a wide geographic distribution and previously known to occur also in the Afrotropical region, shows marked variability in the prehensile palps of males, as evidenced by comparing the specimens from this study with descriptions available in the literature. The genus Heterocypris (with 15 species) and the genera of the two new species described here, Chrissia (with 17 species) and Ilyocypris (with four species), have been previously reported from this biogeographic region as well. The specimens analysed of Chrissia martensi n.sp. were all females, none of which had sperm inside the carapace, indicating the possibility of parthenogenetic reproduction in this species. A peculiar sexual dimorphism in the valve morphology characterises Ilyocypris dahlakensis n.sp., with females having a straight posterior margin, forming a right angle at the ventral anterior edge. Rehydration of dry sediments collected from arid areas where wet periods are short and often unpredictable has proven to be a successful method for describing aquatic invertebrate biodiversity. https://www.jlimnol.it/jlimnol/article/view/2209Recent ostracodsMorphologyTaxonomySars’ methodDahlak Kebirtemporary freshwater ponds |
| spellingShingle | Giampaolo Rossetti Ilaria Mazzini Giorgio Chiozzi Luca Vecchioni Federico Marrone First report of non-marine ostracods (Crustacea, Ostracoda) from the Dahlak Archipelago (Eritrea), with the description of two new species Journal of Limnology Recent ostracods Morphology Taxonomy Sars’ method Dahlak Kebir temporary freshwater ponds |
| title | First report of non-marine ostracods (Crustacea, Ostracoda) from the Dahlak Archipelago (Eritrea), with the description of two new species |
| title_full | First report of non-marine ostracods (Crustacea, Ostracoda) from the Dahlak Archipelago (Eritrea), with the description of two new species |
| title_fullStr | First report of non-marine ostracods (Crustacea, Ostracoda) from the Dahlak Archipelago (Eritrea), with the description of two new species |
| title_full_unstemmed | First report of non-marine ostracods (Crustacea, Ostracoda) from the Dahlak Archipelago (Eritrea), with the description of two new species |
| title_short | First report of non-marine ostracods (Crustacea, Ostracoda) from the Dahlak Archipelago (Eritrea), with the description of two new species |
| title_sort | first report of non marine ostracods crustacea ostracoda from the dahlak archipelago eritrea with the description of two new species |
| topic | Recent ostracods Morphology Taxonomy Sars’ method Dahlak Kebir temporary freshwater ponds |
| url | https://www.jlimnol.it/jlimnol/article/view/2209 |
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