Fig 1.
Dorsal view of the known yeti crab (Kiwaidae) species, from Roterman et al.
[28]. Scale bars are approximate and represent 10 mm. A) Kiwa puravida, B) Kiwa gemma, C) Kiwa araonae, D) Kiwa hirsuta, E) Kiwa tyleri, F) Kiwa sp. SWIR.
Fig 2.
Female (A) and male (B) Kiwa tyleri type specimens, modified from Thatje et al. [25]. Scale bar is approximate and represents 10 mm.
Fig 3.
Measurements of the external morphology of Kiwa tyleri.
CL = carapace length, PL = cheliped propodus length, PH = cheliped propodus height. Scale bar = 10 mm (1 cm).
Table 1.
Summary of Kiwa tyleri measurements including Kiwa puravida measurements extracted from Azofeifa-Solano et al.
[44]. Mean measurements are shown with ± standard deviation. N = number, CL = carapace length, PL = cheliped propodus length, PH = cheliped propodus height.
Fig 4.
Box and whisker plot showing asymmetry index (AI) values for cheliped propodus length and height in 109 specimens of Kiwa tyleri.
Red dot = mean; thick horizonal line = median. The box represents the interquartile range (middle 50% of the data) and whiskers extend 1.5 * interquartile range from the lower and upper quartiles, respectively. Black dots represent outliers (outside 1.5 * interquartile range).
Fig 5.
Scatter plots generated in Rstudio of dominant cheliped propodus dimensions for 135 specimens of Kiwa tyleri collected from from hydrothermal vents on the East Scotia Ridge in the Southern ocean.
A) propodus length vs carapace length and B) log-transformed data. C) propodus height vs carapace length and D) log-transformed data. Blue dots are females and orange triangles are males. Lines in B) and D) are SMA regressions fitted to the data calculated in the smatr R package.
Fig 6.
Scatter plots of cheliped propodus dimensions for 206 specimens of Kiwa puravida taken from Azofeifa-Solano et al.
[44]. A) propodus length vs carapace length and B) log-transformed data. C) propodus height vs carapace length and D) log-transformed data. Blue circles are females and orange hollow triangles are males. Lines in B) and D) are SMA regressions fitted to the data calculated in the smatr R package.
Table 2.
Standardised major axis (SMA) regression model output showing the relationship between log-transformed propodus length/height and carapace length for male and female Kiwa tyleri and Kiwa puravida specimens as performed by the smatr R package.
Models initially compared slope angle between males (M) and females (F) and if non-significant, a comparison with slope elevation (y-axis offset) assuming equal slopes was made. 95% CI = 95% confidence interval, H0 = null hypothesis of test comparing male and female slopes angle/elevation, P = p-value, indicating significance of test with values < 0.05 highlighted in bold. For complete model outputs, see S2 Table.