. . . . "Downloaded the PDF and checked its SHA-256. Text was extracted with pypdf. Counts use the paper's notation trunk+cloacal+caudal. A count was dropped if a question mark in the preceding 15 characters marked it uncertain, or if it sat in an instructional 'for instance' sentence. The binomial in the preceding 220 characters, ignoring ordinary English capitals, received the count. Species means were compared with the pre-registered band 28-32." . . "Measured: 219.5 median of species-mean trunk vertebral counts (n = 86, species means 138 to 355; 0/86 inside 28-32). Interpretation: The sentence says the ribs are as numerous as the days of the month, that is, thirty. It is a count for serpents as a kind, not a count for one species and not a claim about caudal vertebrae. Snakes carry ribs on the trunk vertebrae, one pair on each, so a precloacal or trunk vertebral count is the count of rib-bearing segments. Atlas and axis may lack ribs; a difference of two does not move a count of thirty into the hundreds or the reverse, and the band 28-32 absorbs that ambiguity. 'Thirty' is read as thirty rib-bearing segments, not thirty ribs counted on one side plus thirty on the other. The atlas covers non-caenophidian snakes only. That is a subset of serpents. A subset far from thirty is enough to refute a statement about serpents as a kind. A subset near thirty would not, by itself, prove the claim for every snake, and the support rule is already strict." . "Claim test of aristotle-ha02-25: refutes, confidence 0.8" . . . "A published, openly downloadable table of rib counts or of precloacal or trunk vertebral counts for snakes, measured on specimens or compiled from the specimen literature, not from Aristotle. Non-caenophidian snakes are inside the scope, because the claim says serpents, not a narrower clade. Counts of caudal vertebrae alone are not rib counts and do not count. Page numbers, years, specimen catalogue numbers and sample sizes are not counts." . "claim-test/0.1.0" . "biological" . "The median count is outside 28-32, or fewer than half the species fall inside 28-32. Either result contradicts a statement that serpents' ribs are thirty." . "Criteria were written before the PDF was downloaded and before any vertebral count was read. The article landing page was fetched only to find the PDF URL." . "The atlas counts non-caenophidian snakes, not every snake. Trunk counts include the atlas and axis. Uncertain counts marked with a question mark were not used. Literature ranges written as prose ('155-162 trunk vertebrae') were not parsed; only the plus-notation skeleton counts were." . "The paper's abstract, seen in a search snippet, already states a wide range of vertebral counts. The band 28-32 is the claim's number, not a threshold fit to that range. The verdict uses the table in the file, not the abstract." . "Snake species in the atlas have about thirty ribs or thirty precloacal vertebrae, with the median in 28-32 and at least 80 percent of species inside that band." . "Pre-registered (claim refuted). With at least 10 species, the claim is refuted if the median is outside 28-32 or if fewer than 50 percent of species counts are inside 28-32. If both the support rule and the refute rule fail (for example the median is inside 28-32 but only 60 percent of species are), the verdict is mixed. If fewer than 10 species counts can be extracted, or the PDF cannot be downloaded, the verdict is inconclusive with reason underpowered or data-unavailable. A checksum mismatch on a re-download against the first retrieval is data-unavailable." . "0.8"^^ . . "refutes" . "If the claim holds, snake rib counts are thirty: in a published table of snake vertebral or rib counts, the median count is between 28 and 32 and at least 80 percent of the counts fall in that band." . "One number per species. Median and the fraction of species inside 28-32. Support requires median in band and fraction at least 0.80. Refutation requires median outside the band or fraction below 0.50. Between those, mixed. Fewer than 10 species is underpowered." . "Pre-registered (claim supported). From the vertebral-count table in Szyndlar and Georgalis, Vertebrate Zoology 73 (2023), e101372, using one count per species (the mean of individuals if a species has several, otherwise the stated count). The count is a rib count if the table gives ribs; otherwise it is the precloacal or trunk vertebral count, used as the count of rib-bearing segments. The claim is supported only if at least 10 species have a count, the median is between 28 and 32 inclusive, and at least 80 percent of species counts are between 28 and 32 inclusive." . "false"^^ . . "per-skeleton trunk, cloacal and caudal vertebral counts for non-caenophidian snakes" . "CC BY 4.0" . . "Dataset: An illustrated atlas of the vertebral morphology of extant non-caenophidian snakes" . . . "sha256:012892cf3b2eb7bbb30852439c28fbee01eb50cff8c51d9e49881fd30bd2b8a7" . . "delphisci claim tester (Grok 4.7; cursor/aristotle-biology-claim-tests-2a8b)" . . . "Grok 4.7" . . . . . . . . . "2026-11-08T16:24:31.753Z"^^ . . . . . "Claim test of aristotle-ha02-25: refutes, confidence 0.8" . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB" . "o4ucDdrtBI6wP2UplnIgMX2Tx5vmTtPfNy/hbp3g0MwF75ytW1P5kSAqX20P6sSAnS0lC2M8NsFlEb+vU7tXjavl1NLQ9q1bso8JSBscqnf+QAJ+0WrcQGCZvJyA76cIooMuoc/IAHmrCvx3c7RMSYj8mUGx2/b2EH+FnLOLP3YjmtC0dk3hUVl0+YKQdJTrQVWEZVRv9AX8J7WGrAOs35SX3z5Asa27Uo/H2jphSI/jczkIJLZ6b+6xtrgQ4KAmaSrQXd2HxPG6pet5Uy3Y3xXhblNDyHhnDxnmqnkPfChVskPhWYrNZurXzfi0bzgKpUAzr5uPnqRRJbJ42TsLkQ==" . . .