Image: 20190913 Arthropoda head segments appendages en

Description: Alignment of anterior somites (body segments) and appendages across various euarthropod taxa, based on the most widely-accepted current (2017) observations. 0: Ocular somite 1-2: Somite 1-10 (The remaining somite(s) ommited if exist) Dark grey: Somite(s) correspond to the anteriormost tagma (prosoma of Euchelicerata and head/cephalon of the remaining taxa) Red/P: Protocerebral somite/appendage Yellow/D: Deutocerebral somite/appendage Blue/T: Tritocerebral somite/appendage Fuxianhuiida (fuxianhuiid): Hy: Hypostome An: Antenna SPA: Specialized post-antennal appendage L: (Arthropodized) Leg/walking leg Megacheira (megacheiran/great appendage arthropod): Hy: Hypostome SGA: Short-great appendage L: (Arthropodized) Leg/walking leg Artiopoda (Artiopodan/artiopod: trilobite, aglaspidid and related taxa): Hy: Hypostome An: Antenna L: (Arthropodized) Leg/walking leg Chelicerata: Pycnogonida (pycnogonid/sea spider): ?: (Appendage unknown) Chf: Chelifore P: Palp Ovg: Oviger L: (Arthropodized) Leg/walking leg Chelicerata: Euhelicerata (euchelicerate: merostome and arachnid): Lbr: Labrum Ch: Chelicera Pp: Pedipalp L: (Arthropodized) Leg/walking leg Myriapoda (myriapod): Lbr: Labrum An: Antenna Inc: intercalary segment Mnd: Mandible Mx1: First maxilla Mx2: Second maxilla L: (Arthropodized) Leg/walking leg "Crustacea" (crustacean): Lbr: Labrum An1: First antenna/antennula/antennule An2: Second antenna/antenna Mnd: Mandible Mx1: First maxilla/maxillula Mx2: Second maxilla/maxilla L: (Arthropodized) Leg/walking leg Hexapoda (hexapod: entognathan and insect) Lbr: Labrum An: Antenna Inc: intercalary segment Mnd: Mandible Mx: Maxilla Lab: Labium L: (Arthropodized) Leg/walking leg Panarthropod version: Extant panarthropod version: References： Ortega-Hernández, Javier; Janssen, Ralf; Budd, Graham E. (2017-05). Origin and evolution of the panarthropod head – A palaeobiological and developmental perspective. Arthropod Structure & Development 46 (3): 354–379. doi:10.1016/j.asd.2016.10.011 Overall review. Dunlop, Jason A.; Lamsdell, James C. (2017-05). Segmentation and tagmosis in Chelicerata. Arthropod Structure & Development 46 (3): 395–418. doi:10.1016/j.asd.2016.05.002 Chelicerata, Megacheira. 日本語:
Title: 20190913 Arthropoda head segments appendages en
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Author: Junnn11
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