Variation in the manifestation of mussel morphotypes.

• Main Authors: Vadim Khaitov (2589874), Julia Marchenko (11177903), Marina Katolikova (2589880), Risto Väinölä (2589886), Sarah E. Kingston (3608393), David B. Carlon (11177906), Michael Gantsevich (2589877), Petr Strelkov (2589883)
• Format: Still Image
• Language: unknown
• Published: 2021
• Subjects: Evolutionary Biology; Ecology; Inorganic Chemistry; Environmental Sciences not elsewhere classified; Biological Sciences not elsewhere classified; morphotype; trossulu; White Sea; semi-diagnostic conchological character; Arctic Barents Sea; species identification; mussels Mytilus edulis L; Baltic Sea; unstudied contact zones; Arctic; Barents Sea; Kola Bay
• Online Access: https://doi.org/10.1371/journal.pone.0249587.s001

A-D. Stereoscopic micrographs of the ligament area of mussel valves. Note that scale bars differ between A-C and D. Strip of the prismatic layer under the ligament nympha is indicated by arrows. A, B. E-morphotypes: the space under the ligament nympha is totally (A) or partially (B) covered by the nacre. C, D. T-morphotypes: a strip of uncovered prismatic layer under the ligament nympha is dark and wide (C; typical of most examined populations) or pale and narrow, recognizable by a scar separating it from the nacreous layer (D; typical of the Gulf of Maine populations). E. External and internal features of the shell valves of M . trossulus (right) and M . edulis (left) genotypes from the Kola Bay (from sample Sev.17 in S1 Table ). In most cases T-morphotypes (marked by *) and E-morphotypes could be distinguished by an unaided eye. (TIFF)