Taxonomic Status of Nanotyrannus lancensis (Dinosauria: Tyrannosauroidea) - A Distinct Taxon of Small-Bodied Tyrannosaur Author Longrich, Nicholas R. https://orcid.org/0000-0002-9586-8907 Department of Life Sciences, University of Bath, Claverton Down, Bath BA 2 7 AY, UK nrl22@bath.ac.uk Author Saitta, Evan T. https://orcid.org/0000-0002-9306-9060 Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA evansaitta@gmail.com text Fossil Studies 2024 2024-01-03 2 1 1 65 http://dx.doi.org/10.3390/fossils2010001 journal article 285798 10.3390/fossils2010001 5a77e9a4-5367-4312-8bb1-e6f6b3085f39 10535269
Table 5. LAG data, body mass, and growth rate estimates rounded to the nearest kg for Sue (FMNH PR 2081), Petey (BMRP 2006.4.4), and Jane (BMRP 2002.4.4) based on femoral circumferences, including corrected values for Jane based on a split multi-LAG interpretation [49]. Campione et al. [50] estimate Sue’s mass at death (i.e., after LAG #23) as 7377 kg after applying a correction for non-circular femoral cross-section. Hutchinson et al. [104] estimate Jane’s mass at death (i.e., after LAG #9) as 954 kg based on 3D modeling. See Supplemental File for equations used in calculations. Note that LAG #1 and the periosteum do not record a full year of growth. Periosteum is assigned a LAG pseudo-number of +0.5 after the final LAG, indicating that death could have occurred at any point after the last yearly marker was deposited while assigning an age at the midpoint of that final year. Jane required estimation of LAG/periosteum circumferences from LAG spacing and femoral width due to the incomplete cross-section of the femur midshaft. (1) LAG (or periosteum) distance from endosteum is measured at the time of death, (2) femoral width at midshaft (including medullary cavity) is measured at time of death and back estimated using LAG spacing, (3) femoral circumference derived from femoral width at a given year is approximated as a circular cross-section. Data sources: Campione et al. [50]; Cullen et al. [49]; Woodward et al. [46].
SpecimenNicknameTaxonLAG No.Circumference (mm)Mass (kg) (Campione et al., 2014), Equation (7))Mass Increase from Previous LAG (kg)
FMNH PR 2081SueTyrannosaurus1338.71924NA
FMNH PR 2081SueTyrannosaurus23872777853
FMNH PR 2081SueTyrannosaurus3415.73382605
FMNH PR 2081SueTyrannosaurus4440.33962580
FMNH PR 2081SueTyrannosaurus5459.74461500
FMNH PR 2081SueTyrannosaurus6485.55185724
FMNH PR 2081SueTyrannosaurus7511.15973788
FMNH PR 2081SueTyrannosaurus8527.16503529
FMNH PR 2081SueTyrannosaurus9542.87050547
FMNH PR 2081SueTyrannosaurus10551.67369319
FMNH PR 2081SueTyrannosaurus11559.37656287
FMNH PR 2081SueTyrannosaurus12564.97869213
FMNH PR 2081SueTyrannosaurus13565.7790031
FMNH PR 2081SueTyrannosaurus14566.5793131
FMNH PR 2081SueTyrannosaurus15567.4796535
FMNH PR 2081SueTyrannosaurus16568.2799631
FMNH PR 2081SueTyrannosaurus17569802731
FMNH PR 2081SueTyrannosaurus18569.8805931
FMNH PR 2081SueTyrannosaurus19570.7809435
FMNH PR 2081SueTyrannosaurus20571.5812531
FMNH PR 2081SueTyrannosaurus21572.3815631
FMNH PR 2081SueTyrannosaurus22573.1818831
FMNH PR 2081SueTyrannosaurus23574822335
FMNH PR 2081SueTyrannosaurusPeriosteum5798422199
BMRP 2006.4.4PeteyNanotyrannus1148.4198NA
BMRP 2006.4.4PeteyNanotyrannus2165.926971
BMRP 2006.4.4PeteyNanotyrannus3194.7419149
BMRP 2006.4.4PeteyNanotyrannus4214.5547128
BMRP 2006.4.4PeteyNanotyrannus5223.661366
BMRP 2006.4.4PeteyNanotyrannus6229.465845
BMRP 2006.4.4PeteyNanotyrannus7234.870144
BMRP 2006.4.4PeteyNanotyrannusPeriosteum244.778684
BMRP 2002.4.4JaneNanotyrannus1195.9426NA
BMRP 2002.4.4JaneNanotyrannus2218.4575149
BMRP 2002.4.4JaneNanotyrannus3231.8677102
BMRP 2002.4.4JaneNanotyrannus4247.3809132
BMRP 2002.4.4JaneNanotyrannus5248.682011
BMRP 2002.4.4JaneNanotyrannus6255.388463
BMRP 2002.4.4JaneNanotyrannus7257.790623
BMRP 2002.4.4JaneNanotyrannus8265.798679
BMRP 2002.4.4JaneNanotyrannus9266.69959
BMRP 2002.4.4JaneNanotyrannusPeriosteum273.2106469
BMRP 2002.4.4Jane (corrected)Nanotyrannus1195.9426NA
BMRP 2002.4.4Jane (corrected)Nanotyrannus2218.4575149
BMRP 2002.4.4Jane (corrected)Nanotyrannus3231.8677102
BMRP 2002.4.4Jane (corrected)Nanotyrannus4248.6820144
BMRP 2002.4.4Jane (corrected)Nanotyrannus5257.790686
BMRP 2002.4.4Jane (corrected)Nanotyrannus6266.699588
BMRP 2002.4.4Jane (corrected)NanotyrannusPeriosteum273.2106469