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1 November 2018Early Post-Embryonic Development in Ellipsostrenua (Trilobita, Cambrian, Sweden) and the Developmental Patterns in Ellipsocephaloidea
1National Museum Prague, Department of Paleontology, Cirkusová 1740, 193 00 Praha 9, Czech Republic ⟨ 2The Czech Academy of Sciences, Institute of Geology, Rozvojová 269, 165 00 Praha 6, Czech Republic ⟨ 3Axelvoldsvägen 27, SE-241 35 Eslöv, Sweden ⟨peter.cederstrom@telia.com⟩ 4Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden ⟨per.ahlberg@geol.lu.s
This study documents the early post-embryonic developmental stages (protaspides and early meraspides) of the Cambrian trilobite Ellipsostrenua granulosa (Ahlberg, 1984) from the Gärdsjön Formation of Jämtland, Sweden. The early protaspid stage is characterized by a circular outline of the exoskeleton, two pairs of fixigenal spines, a short preglabellar field, a genal swelling, and prominent bacullae. The late protaspid stage differs only in having the trunk portion discernible. Early meraspid cranidia are sub-rectangular with prominent palpebral lobes, a wide anterior margin, a proportionally long anterior branch of the facial suture, and intergenal spines. Meraspid pygidia tentatively assigned to this species possess comparatively long macrospines. Small hypostomes associated with E. granulosa bear at least four pairs of marginal spines. A comparison of the early developmental stages of E. granulosa with some other species of Ellipsocephalidae and with species of the closely related Estaingiidae reveals several similarities. The conservative morphology of the early protaspid stage with only two pairs of fixigenal spines, the timing of the development of the trunk portion, and the presence of genal swellings and prominent bacullae could be phylogenetically informative. The range of size variation of the early protaspid stages in two families may be related either to taxonomical differences between Ellipsocephalidae and Estaingiidae, or to environmental differences in various paleogeographic settings.
Lukáš Laibl,Peter Cederström, andPer Ahlberg "Early Post-Embryonic Development in Ellipsostrenua (Trilobita, Cambrian, Sweden) and the Developmental Patterns in Ellipsocephaloidea," Journal of Paleontology 92(6), 1018-1027, (1 November 2018). https://doi.org/10.1017/jpa.2018.25
Accepted: 31 March 2018; Published: 1 November 2018
Lukáš Laibl, Peter Cederström, Per Ahlberg "Early Post-Embryonic Development in Ellipsostrenua (Trilobita, Cambrian, Sweden) and the Developmental Patterns in Ellipsocephaloidea," Journal of Paleontology, 92(6), 1018-1027, (1 November 2018)
