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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: x Newsgroups: sci.bio.paleontology Subject: Arthropod phylogeny Date: Mon, 2 Jun 2025 10:58:21 -0700 Organization: A noiseless patient Spider Lines: 19 Message-ID: <101kont$3dvcf$2@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Mon, 02 Jun 2025 19:58:22 +0200 (CEST) Injection-Info: dont-email.me; posting-host="7c059eec7e0de5e583cd3e081b9b36c4"; logging-data="3603855"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19ZO0uWD8fIqjz/OVOwQslyPbbheJB+C0s=" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Cancel-Lock: sha1:64YbXXI/vuDzvEwMp0gRe9xUbjQ= Content-Language: en-US So there is the tadpole shrimp, the horseshoe crab, and the trilobite. There is Chelicerata and Mandibulata. There is Decapoda and Hexapoda. So basic questions. Are exoskeletons monophyletic? Is the trilobite more closely related to the tadpole shrimp, the horseshoe crab, or are the tadpole shrimp and horseshoe crab more closely related to each other than to the trilobite? Are sea spiders closely related to land spiders? Do they have too many joints in their legs to be closely related? Are they a crown group of the arthropods and they have eight legs by coincidence? Or are they actually pretty closely related to land spiders?