Belongs within: Spiriferida.
Martinia is a Lower Carboniferous genus of brachiopods lacking prominent ornamentation (Boucot et al. 1965).
Characters (Boucot et al. 1965): Fold and sulcus distinct, forming uniplicate anterior commissure; macro-ornament absent; micro-ornament consisting of concentric growth lamellae and surficial pits; pedicle valve interior lacking dental plates and median septum; brachial valve interior lacking crural plates.
<==Martinia M’Coy 1844 [=Pseudomartinia Leidhold 1928; incl. Paramartinia Reed 1949]BJ65
|--*M. glabra (Sowerby 1820)BJ65 (see below for synonymy)
|--M. acuminataG31
|--M. acutomarginalisG31
|--M. aviformisG31
|--M. baschkiricaG31
|--M. carinthiacaG31
|--M. clannyana [=Ambocoelia (Martinia) clannyana]G31
|--M. corculumG31
|--M. corneliaG31
|--M. distefanoi Gemmellaro 1898–1899 [incl. M. distefanoi var. spissa Grabau 1931]G31
|--M. distorta Grabau 1931G31
|--M. elegansG31
|--M. frechiG31
|--M. krafftiG31
|--M. lamellosusG31
|--M. lingulata Reed 1949 [=M. (*Paramartinia) lingulata]BJ65
|--M. ‘lingulata’ Duan & Li in Ding, Xia et al. 1984 non Reed 1949DX84
|--M. lopingensis [=M. triquetra var. lopingensis]G31
|--M. manchuriensisG31
|--M. mirabilis Duan & Li in Ding, Xia et al. 1984DX84
|--M. mongolica Grabau 1931G31
|--M. nuculaG31
|--M. orbicularis Gemmellaro 1898–1899G31
|--M. orientalisG31
|--M. osborni Grabau 1931G31
|--M. parvula Tschernyschew 1902G31
|--M. peculiaris (Shumard 1855)[=Spirifer (Martinia) peculiaris]W77
|--M. planoconvexa (Shumard 1855) [=Spirifer (Martinia) planoconvexus; incl. Ambocoelia gemmula McChesney 1860]W77
|--M. polymorphaG31
|--M. rectangularis Grabau 1931G31
|--M. rhomboidalis Grabau 1931G31
|--M. rupicolaG31
|--M. semiglobosaG31
|--M. semiplana [incl. M. semiplana var. asinosa, M. semiplana var. lata]G31
|--M. semiramisG31
|--M. sinensis Grabau 1931G31
|--M. triquetra Gemmellaro 1899G31
|--M. uralica Tschernyschew 1902 [incl. M. uralica var. longa]G31
`--M. variabilisG31
*Martinia glabra (Sowerby 1820)BJ65 [=Spirifer glaberBJ65, Anomites glaberW77, *Pseudomartinia glabraBJ65, Spirifera glabraW77; incl. Spirifer (Martinia) glaber var. contracta Meek & Worthen 1866W77, Spirifer laevigatus von Buch 1840W77, Trigonotreta oblata Bronn 1836W77]
*Type species of generic name indicated
References
[BJ65] Boucot, A. J., J. G. Johnson, C. W. Pitrat & R. D. Staton. 1965. Spiriferida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt H. Brachiopoda vol. 2 pp. H632–H728. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas Press: Lawrence (Kansas).
[DX84] Ding Y., Xia G., Duan C., Li W., Liu X. & Liang Z. 1984. Study on the early Permian stratigraphy and fauna in Zhesi district, Nei Mongol Zizhiqu (Inner Mongolia). Bulletin of the Tianjin Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences 10: 1–244, 258 pls.
[G31] Grabau, A. W. 1931. The Permian of Mongolia: A report on the Permian fauna of the Jisu Honguer limestone of Mongolia and its relations to the Permian of other parts of the world. American Museum of Natural History: New York.
[W77] White, C. A. 1877. Report upon the invertebrate fossils collected in portions of Nevada, Utah, Colorado, New Mexico, and Arizona, by parties of the expeditions of 1871, 1872, 1873, and 1874. U.S. Geographical Surveys West of the One Hundredth Meridian 4 (1): 1–219, pls 1–21.