Martesia

Delfino, Marina & Signorelli, Javier H., 2021, Fig. 13 in Fig. 12. Majella pristis n in Periclimenaeus djiboutensis Bruce 1970, Zoological Studies 60 (28), pp. 1-20 : 12

Genus Martesia (ex Leach MS) G.B. Sowerby I,

1824 (in 1821–1834)

[ Mactresia Gray, 1840: 150 ; Mactesia Paetel, 1875: 119 (nom. null.); Martesiella Verrill and Bush, 1898: 777 , type species Martesiella fragilis , by monotypy; Hiata Zetek and Mclean, 1936: 110 , objective, type species H. infelix (= Pholas striatus Linnaeus ), by original designation; Mesopholas Taki and Habe, 1945: 109 , objective, type species: Mesopholas intusgranosa (= Pholas striatus Linnaeus ), by original designation; Diploplax Bartsch and Rehder, 1945: 10, objective, type species: Martesia (Diploplax) americana (= Pholas striatus Linnaeus ), by original designation].

Type species: Pholas clavata Lamarck, 1818: 446 (= Pholas striatus Linnaeus, 1758: 669 ) by monotypy.

Distribution: Western Atlantic, Eastern Pacific, United Kingdom, Indo-Pacific and Australia.

Remarks: Species included in Martesia show two different sculptured areas on the external surface of the shell. Both valves are closed by a callum placed in the anterior part of the shell. The anterior area is sculptured by radial ridges whereas the posterior area by concentric ridges. Shell outline, sculpture and mesoplax and hypoplax morphology have taxonomic value to identify species within Martesia ( Holmes et al. 2015) . Bartsch and Rehder (1945) revised the genera Martesia and considered necessary to establish 4 subgenera. Later, Turner (1955) revealed that juveniles do not develop a callum yet which is a character of adults and therefore synonymized the subgenera Martesia (Martesia) with Martesia (Diploplax) . On the other hand, Diplothyra was elevated to a genus level based on callum and mesoplax morphology, leaving only two valid subgenera within Martesia ( Turner 1955) . Currently, six valid species are included in Martesia ( Srinivasan 1959; Rios 1994 2009; Huber 2010). Martesia striata ( Linnaeus, 1758) , Martesia cuneiformis ( Say, 1822) and Martesia fragilis Verrill and Bush, 1898 have been reported as widely distributed but commonly registered along the western Atlantic Ocean. Other described species are: Martesia multistriata (G. B. Sowerby II, 1849) from Australian seas, Martesia nairi Turner and Santhakumaran, 1989 from India, and Martesia pygmaea Tchang et al. 1960 from Chinese seas.