方舟
发表于 2025-3-23 13:43:58
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entail
发表于 2025-3-23 14:33:05
Ornamental Polymorphism in Placenticeras kaffrarium (Ammonoidea; Upper Cretaceous of India): Evolutithe presentday organic world this term is used in reference to colonial organisms such as bryozoans and cnidarians and castes in bees, ants, and wasps. Recognition of polymorphism requires study of large populations of the organism in question. That is why it is frequently observed in the living organic world but is rarely recorded in fossils.
起皱纹
发表于 2025-3-23 19:21:41
Book 2007ine ecos- tems throughout the world and comprise approximately 900 species. They also have an extraordinary fossil record, extending back to the Cambrian Period, with as many as 10,000 extinct species. Throughout their long history, they have experienced sp- tacular radiations and near-total extinct
granite
发表于 2025-3-24 01:29:07
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无法解释
发表于 2025-3-24 05:32:38
Einleitung und Erkenntnisinteresse,Muscle attachment scars (the dorsal and ventral scars) were listed as “unpublished observations” by Doguzhaeva and Mutvei (1996: 54), but, as far as we know, they never published these “observations” in greater detail.
jet-lag
发表于 2025-3-24 10:11:27
https://doi.org/10.1007/978-3-658-03636-2tatic pressure (siphuncular strength index) from the siphuncular wall thickness, multiplied by 100 and divided by the siphuncle inner radius. This index was thought to indicate the maximum water depth where ammonoid shell imploded and, hence, the maximum habitat depth of the animal.
Frenetic
发表于 2025-3-24 14:01:01
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笨拙的我
发表于 2025-3-24 18:20:34
https://doi.org/10.1007/978-3-658-03734-5e body chamber inherited from ectocochlean ancestors (Crick, 1896; Naef, 1922; Jeletzky, 1966; Doyle and Shakides, 2004). Rostral layers (primordial rostrum + rostrum) and the mural parts of the septa do not belong to the conotheca proper.
angina-pectoris
发表于 2025-3-24 22:02:39
Patterns of Embryonic Development in Early to Middle Devonian Ammonoidsiction (Landman et al., 1996; Klofak et al., 1999). Internally, the siphuncle originates in the initial chamber as a rounded caecum and is attached to the shell wall by a prosiphon (Landman, 1988: Figs. 1, 2 and Klofak et al., 1999: Figs. 1, 2).
容易懂得
发表于 2025-3-25 00:48:20
Soft-tissue Attachment of Middle Triassic Ceratitida from GermanyMuscle attachment scars (the dorsal and ventral scars) were listed as “unpublished observations” by Doguzhaeva and Mutvei (1996: 54), but, as far as we know, they never published these “observations” in greater detail.