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Sericoidea craigensis

Strophomenata - Strophomenida - Aegiromenidae

Plectambonites sericea craigensis was named by Reed (1917) [= Leptaena sericea, Sowerby, Davidson 1883 (pars), Mon. Brit. Foss. Brack., vol. v, Silur. Suppl., p. 227 Lectotypes designated by Cocks (1978).]. Its type specimen is B 73524 and is a 3D body fossil.

It was recombined as Leptelloidea craigensis by Jones (1928); it was recombined as Chonetoidea (Aegiria) craigensis by Reed (1935); it was synonymized subjectively with Sericoidea restricta by Williams (1962); it was recombined as Sericoidea craigensis by Candela (2011).

Synonymy list
YearName and author
1917Plectambonites sericea craigensis Reed pp. 883 - 884 figs. pl. xv, figs. 12-17
1928Leptelloidea craigensis Jones p. 496
1935Chonetoidea (Aegiria) craigensis Reed p. 343
1957Chonetoidea gamma Spjeldnaes pp. 106 - 107 figs. Pl. 2, figs. 12-13, textfig. 24C
1984Sericoidea gamma Harper et al. p. 305 figs. 6B, E–J
2011Sericoidea craigensis Candela p. 509 fig. 6K–O

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phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyPlectambonitoideaJones 1928
familyAegiromenidae(Havlicek 1961)
genusSericoideaLindström 1953

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

F. R. C. Reed 1917Shell semicircular, plano-convex, compressed, flattened, widest along hinge-line, cardinal angles subacute at 60°-75°, slightly alate, pointed. Pedicle-valve very slightly convex, most so along middle ; beak small, acute, not swollen, scarcely projecting, very slightly incurved ; hinge-area very narrow, steeply inclined to plane of valve ; interior with pair of very small short divergent triangular diductors about one-fifth the length of valve. Brachial valve flat or very slightly concave ; beak inconspicuous ; interior with large subflabellate divergent muscle-scars about one-third to one-half the length of valve, with thickened crinkled anterior margins, and each muscle-scar divided by narrow radial ridge into anterior and posterior adductor. Surface of valves ornamented with 12-16 unusually strong straight primary radii, generally equidistant, with a shorter secondary one in each interspace and 3-5 finer thread-like lines between. Interiors with coarse pustules radially arranged along the lines.
N. Spjeldnaes 1957 (Chonetoidea gamma)Chonetoidea species with strong ventral muscle impressions,
small, regular branchial arches with some few spines in the
marginal parts of the dorsal interior, and a differentiated sculpture.
Y. Candela 2011Ornament unequally parvicostellate, consisting in 11 costellae permmat the 2mmgrowth stage; four to five costellae per sector; five primary costae originate at the umbo. Dorsal interior with septule signature one ms + one pair of sms + five pairs of septules disposed in one single row; a second row is rarely developed with no more than five septules; anterior end of median septum extending for 40% of valve length; median septum 25% as long as valve length; arc 40% as long as wide, developed in the posterior half of the valve floor.