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Grams M, Klinger M, Richter S. Neither leg nor jaw—nor always the same: a critical revision of the eumalacostracan maxilliped. Zool J Linn Soc 2022. [DOI: 10.1093/zoolinnean/zlac083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Within Malacostraca, legs are diversified variously throughout the groups. Most conspicuous is the transformation of anterior thoracopods, especially the first, into maxillipeds involved in feeding. However, the concept of a maxilliped is not precise, because it relates to a vague combination of morphological and functional deviation from a locomotory limb. Although general homology of the first thoracopod (maxilliped or not) is beyond doubt, special homology (synapomorphy) of the anteriormost maxillipeds remains uncertain. For better insights, we studied the musculature and exoskeletal structures of the first thoracopods in Anaspidacea, Euphausiacea, Lophogastrida, Mysida and Stygiomysida, using three-dimesional reconstruction of laser scanning microscopy and micro-computed tomography data. Our analysis shows high muscular and skeletal complexity of the first thoracopods. We herein reject the term ‘maxilliped’ for Anaspidacea and Euphausiacea, because their first thoracopods differ little from the posterior limbs, although specific correspondences between these taxa might represent synapomorphies. The ‘mysidacean maxilliped’ is morphologically well derived from the posterior thoracopods and appears synapomorphic for the mysidacean subtaxa. A comparison with other Peracarida additionally shows correspondences indicating a homologous ‘peracaridan maxilliped’. In contrast, we consider the peracaridan maxilliped not to be homologous to the decapodan maxilliped. As a distinction, we propose the term ‘unguiped’ for the peracaridan first thoracopod.
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Affiliation(s)
- Markus Grams
- Allgemeine & Spezielle Zoologie, Institut für Biowissenschaften, Universität Rostock , Rostock , Germany
| | - Michael Klinger
- Allgemeine & Spezielle Zoologie, Institut für Biowissenschaften, Universität Rostock , Rostock , Germany
| | - Stefan Richter
- Allgemeine & Spezielle Zoologie, Institut für Biowissenschaften, Universität Rostock , Rostock , Germany
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Ou Q, Vannier J, Yang X, Chen A, Mai H, Shu D, Han J, Fu D, Wang R, Mayer G. Evolutionary trade-off in reproduction of Cambrian arthropods. SCIENCE ADVANCES 2020; 6:eaaz3376. [PMID: 32426476 PMCID: PMC7190318 DOI: 10.1126/sciadv.aaz3376] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Accepted: 02/03/2020] [Indexed: 06/11/2023]
Abstract
Trade-offs play a crucial role in the evolution of life-history strategies of extant organisms by shaping traits such as growth pattern, reproductive investment, and lifespan. One important trade-off is between offspring number and energy (nutrition, parental care, etc.) allocated to individual offspring. Exceptional Cambrian fossils allowed us to trace the earliest evidence of trade-offs in arthropod reproduction. †Chuandianella ovata, from the early Cambrian Chengjiang biota of China, brooded numerous (≤100 per clutch), small (Ø, ~0.5 mm) eggs under carapace flaps. The closely related †Waptia fieldensis, from the middle Cambrian Burgess Shale of Canada, also brooded young, but carried fewer (≤ 26 per clutch), larger (Ø, ~2.0 mm) eggs. The notable differences in clutch/egg sizes between these two species suggest an evolutionary trade-off between quantity and quality of offspring. The shift toward fewer, larger eggs might be an adaptive response to marine ecosystem changes through the early-middle Cambrian. We hypothesize that reproductive trade-offs might have facilitated the evolutionary success of early arthropods.
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Affiliation(s)
- Qiang Ou
- Early Life Evolution Laboratory, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
- Department of Zoology, University of Kassel, 34132 Kassel, Germany
| | - Jean Vannier
- Université de Lyon, Université Lyon 1, ENS de Lyon, Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement (CNRS-UMR 5276), 69622 Villeurbanne, France
| | - Xianfeng Yang
- MEC International Joint Laboratory for Palaeoenvironment, Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China
| | - Ailin Chen
- Research Center of Paleobiology, Yuxi Normal University, Yuxi, Yunnan 653100, China
| | - Huijuan Mai
- MEC International Joint Laboratory for Palaeoenvironment, Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China
| | - Degan Shu
- Shaanxi Key Laboratory of Early Life and Environment, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
| | - Jian Han
- Shaanxi Key Laboratory of Early Life and Environment, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
| | - Dongjing Fu
- Shaanxi Key Laboratory of Early Life and Environment, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
| | - Rong Wang
- Early Life Evolution Laboratory, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
| | - Georg Mayer
- Department of Zoology, University of Kassel, 34132 Kassel, Germany
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Angyal D, Chávez-Solís EM, Liévano-Beltrán LA, Magaña B, Simoes N, Mascaró M. New distribution records of subterranean crustaceans from cenotes in Yucatan (Mexico). Zookeys 2020; 911:21-49. [PMID: 32104137 PMCID: PMC7031413 DOI: 10.3897/zookeys.911.47694] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 01/03/2020] [Indexed: 11/24/2022] Open
Abstract
New records of 14 stygobiont crustacean species pertaining to six Malacostraca orders from 32 cenotes are presented, with their associated caves of the state of Yucatan, Mexico, together with an individual account for each species. Species composition of most of the investigated cenotes is examined for the first time. A thermosbaenacean and two amphipod species were not formally recorded to the cenote ecosystems of the state of Yucatan prior to our research. Distribution data of a cirolanid isopod previously known only from its type locality is also provided. Barcodes of mitochondrial cytochrome c oxidase subunit I for the reported peracarid species previously lacking this information have been included in present study as tools for species identification and a baseline of further molecular genetic analyses.
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Affiliation(s)
- Dorottya Angyal
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Puerto de abrigo S/N, C.P. 97356, Sisal, Yucatan, Mexico.,Department of Zoology, Hungarian Natural History Museum, Baross u. 13, 1088 Budapest, Hungary
| | - Efraín M Chávez-Solís
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Puerto de abrigo S/N, C.P. 97356, Sisal, Yucatan, Mexico.,Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Copilco-Universidad, Ciudad de México 04510, México
| | - Luis A Liévano-Beltrán
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Puerto de abrigo S/N, C.P. 97356, Sisal, Yucatan, Mexico.,Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Copilco-Universidad, Ciudad de México 04510, México
| | - Benjamín Magaña
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Puerto de abrigo S/N, C.P. 97356, Sisal, Yucatan, Mexico
| | - Nuno Simoes
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Puerto de abrigo S/N, C.P. 97356, Sisal, Yucatan, Mexico.,Laboratorio Nacional de Resiliencia Costera, Laboratorios Nacionales (LANRESC), CONACYT, Puerto de abrigo S/N, C.P. 97356, Sisal, Yucatan, Mexico.,International Chair for Ocean and Coastal Studies, Harte Research Institute, Texas A&M at Corpus Christi, Texas, USA
| | - Maite Mascaró
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Puerto de abrigo S/N, C.P. 97356, Sisal, Yucatan, Mexico.,Laboratorio Nacional de Resiliencia Costera, Laboratorios Nacionales (LANRESC), CONACYT, Puerto de abrigo S/N, C.P. 97356, Sisal, Yucatan, Mexico
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Vogt G. Structural specialties, curiosities, and record-breaking features of crustacean reproduction. J Morphol 2016; 277:1399-1422. [DOI: 10.1002/jmor.20582] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/18/2016] [Accepted: 07/06/2016] [Indexed: 12/22/2022]
Affiliation(s)
- Günter Vogt
- Faculty of Biosciences; University of Heidelberg; Im Neuenheimer Feld 230 69120 Heidelberg Germany
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Jones WT, Feldmann RM, Schram FR, Schweitzer CE, Maguire EP. The Proof is in the Pouch:Tealliocarisis a Peracarid. ACTA ACUST UNITED AC 2016. [DOI: 10.18476/pale.v9.a5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Akther H, Agersted MD, Olesen J. Naupliar and Metanaupliar Development of Thysanoessa raschii (Malacostraca, Euphausiacea) from Godthåbsfjord, Greenland, with a Reinstatement of the Ancestral Status of the Free-Living Nauplius in Malacostracan Evolution. PLoS One 2015; 10:e0141955. [PMID: 26682744 PMCID: PMC4684318 DOI: 10.1371/journal.pone.0141955] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 10/13/2015] [Indexed: 11/28/2022] Open
Abstract
The presence of a characteristic crustacean larval type, the nauplius, in many crustacean taxa has often been considered one of the few uniting characters of the Crustacea. Within Malacostraca, the largest crustacean group, nauplii are only present in two taxa, Euphauciacea (krill) and Decapoda Dendrobranchiata. The presence of nauplii in these two taxa has traditionally been considered a retained primitive characteristic, but free-living nauplii have also been suggested to have reappeared a couple of times from direct developing ancestors during malacostracan evolution. Based on a re-study of Thysanoessa raschii (Euphausiacea) using preserved material collected in Greenland, we readdress this important controversy in crustacean evolution, and, in the process, redescribe the naupliar and metanaupliar development of T. raschii. In contrast to most previous studies of euphausiid development, we recognize three (not two) naupliar (= ortho-naupliar) stages (N1-N3) followed by a metanauplius (MN). While there are many morphological changes between nauplius 1 and 2 (e.g., appearance of long caudal setae), the changes between nauplius 2 and 3 are few but distinct. They involve the size of some caudal spines (largest in N3) and the setation of the antennal endopod (an extra seta in N3). A wider comparison between free-living nauplii of both Malacostraca and non-Malacostraca revealed similarities between nauplii in many taxa both at the general level (e.g., the gradual development and number of appendages) and at the more detailed level (e.g., unclear segmentation of naupliar appendages, caudal setation, presence of frontal filaments). We recognize these similarities as homologies and therefore suggest that free-living nauplii were part of the ancestral malacostracan type of development. The derived morphology (e.g., lack of feeding structures, no fully formed gut, high content of yolk) of both euphausiid and dendrobranchiate nauplii is evidently related to their non-feeding (lecithotrophic) status.
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Affiliation(s)
- Hasna Akther
- Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark
- National Institute of Aquatic Resources, Section for Oceanography and Climate, Technical University of Denmark, Charlottenlund, Denmark
| | - Mette Dalgaard Agersted
- National Institute of Aquatic Resources, Section for Oceanography and Climate, Technical University of Denmark, Charlottenlund, Denmark
| | - Jørgen Olesen
- Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark
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Correction: The Unique Dorsal Brood Pouch of Thermosbaenacea (Crustacea, Malacostraca) and Description of an Advanced Developmental Stage of Tulumella unidens from the Yucatan Peninsula (Mexico), with a Discussion of Mouth Part Homologies to Other Malacostraca. PLoS One 2015; 10:e0133109. [PMID: 26176214 PMCID: PMC4503714 DOI: 10.1371/journal.pone.0133109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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