Contributions to Zoology, 86 (2) – 2017Gerrit Potkamp; Mark J.A. Vermeij; Bert W. Hoeksema: Genetic and morphological variation in corallivorous snails (Coralliophila spp.) living on different host corals at Curaçao, southern Caribbean
Results

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Shell dimensions

Shell length of C. galea and C. caribaea ranged from 3.4 to 38.9 mm and 4.3 to 25.8 mm respectively. In both species, a clear host-associated size structuring of shell length existed (F = 13.6; p < 0.0001 and F = 5.8; p < 0.0001 for C. galea and C. caribaea, respectively (Fig. 7). The mean length of C. galea, snails differed among host species (29 combinations of host pairs, post-hoc Tukey HSD test), compared to a total of for C. caribaea (Tables S2-S3 in Online Supplementary Material 4). C. caribaea (nine pairs of hosts) associated with alcyonacean host species that were larger (based on shell length) than snails associated with scleractinian hosts (including all specimens; F = 23.8; p < 0.0001; Fig. 7).

FIG2

Fig. 7. Host-dependent size structuring of Coralliophila galea (a) and C. caribaea (b). Error bars represent one standard deviation. Shell length is plotted on a logarithmic scale; numbers above axis represent sample sizes. For significant differences, see Tables S2 and S3 for C. galea and C. caribaea, respectively (Online Supplementary Material 4).

C. curacaoensis sp. nov. was on average smaller (shell length 2.5-8.9 mm) than C. galea and C. caribaea. However, C. curacaoensis sp. nov. was only found on Madracis auretenra, which was also a host of C. galea. Coralliophila galea individuals associated with M. auretenra (shell length 5.4-9.7 mm) were not different in size compared to specimens of C. curacaoensis sp. nov. (F = 4.07; p = 0.061).