1963 Mesoglyphioceras granosus var. barruelensis Wagner-Gentis: 11, pl.1 figs.1a-b, pl.2 figs.1a-b, pl.5 fig.1a-b.
1979 Dombarites barruelensis.-Kullmann: 193.
1980 Revilloceras barruelense.-Wagner-Gentis: 14, text-fig.8A-C, pl.5 fig.2-3.

Original description from Wagner-Gentis, 1963:

"Mesoglyphioceras granosus Portlock var. barruelensis nov. var.

Dimensions of the holotype:

Diameter D 34 mm, Width W ca 20 mm, Height of whorl H 16 mm, Height of opening h 6 mm, Umbilicus O 5? mm

Description:

Shell discoid, sides rounded, involute, low opening, small umbilicus.

Three constrictions per whorl.

Ornamentation: Rather strong longitudinal striae (which occur with 3 per 1,5 mm. across the venter in a shell with D = 34 mm.). They are crossed by very fine transverse lirae. The ornamentation is only preserved as a small patch

on the venter.

Suture line: Ventral lobe narrowv and constricted in the middle.The median saddle reaches up to »of the depth of the lobe and has a siphonal notch. The lobes on each side of the medial saddle are very narrow and have long points. Rather narrow lateral saddle with a rounded point; it is slightly asymmetric and constricted at half its height. The lateral lobe is very markedly triangular. The second lateral saddle is wide and rounded. It ends in the umbilicus. The internal suture line is not exposed.

Discussion

Our specimen is comparable to Mesoglyphioceras granosus var. aciculare Pareyn, but is distinguished by the presence of a much narrower ventral lobe and a shorter first lateral saddle. The ventral lobe is reminiscent of those of Cravenoceras. The sides of this lobe are more parallel than in Mesoglyphioceras granosus Portlock var. aciculare Pareyn.

Occurrence:

NW. Spain: West of Revilla (Palencia) in lac. L134, where it occurs in the assemblage quoted on page 11. It apparently belongs to the E1 zone."

Emended diagnosis from Wagner-Gentis, 1980

Emended diagnosis — This is based on the much better preserved topotype. Shape involute, ellipsocone with rounded venter and rounded sides. Umbilicus about one quarter of the diameter. Umbilical edge narrowly rounded and

umbilical wall at right angles to the sides. Three constrictions per whorl. They are shallow to non-existent near the

umbilicus, cross the sides deeply in a straight line and on the venter form a shallow sinus. Ornament consists of 35 longitudinal striae per half-whorl, crossed by very fine and closely set transverse lirae, forming fine granules on the crossing points. Ornament in general similar to that of Goniatites granosus, but possesses c. 35 instead of c. 40 longitudinal striae.

Suture as for genus Revilloceras.

Description — See emended diagnosis. The constrictions are not always entirely straight on the sides. The transverse lirae leave the umbilicus in a forward direction and form a shallow salient at the point where the constriction deepens on the lateral side. They then continue to follow the direction of the constrictions. On some of the specimens the spacing of the longitudinal striae around the umbilical edge is not always the same. The suture (Fig. 8B) consists of a ventral lobe with narrow, sharply pointed secondary lobes. The median saddle reaches 50% to 52% of the depth

of the ventral lobe in maturity. The sides of the ventral lobe are parallel to slightly constricted just above the top of the median saddle. From that point onwards they diverge to form triangular ventro-lateral saddles with blunt tips.

The lower part of the sides are parallel over a short distance. The following lateral lobes are parallel-sided at first and then commence to form a triangular base with a long narrow point. Second lateral saddles are asymmetrical, wide

and rounded; they terminate on the umbilical wall with a small, narrow pointed lobe. The internal suture is poorly visible, but probably consists of three narrow pointed lobes, which are inflated in the middle. On each side of the dorsal lobe are rounded saddles, which are narrow and inflated. The lateral saddles are asymmetrical, wide and rounded.

Comparisons — Revilloceras barruelense differs from Goniatites granosus by its wider spaced longitudinal striae (35 per half-whorl as against 40 in G. granosus). The ornament is otherwise very similar. The sutures are very different compare with sutures as figured by Moore, 1936, pl. 3, figs. 10, 12). Dombarites globiformis (Kullmann, 1961, p. 294) has many more longitudinal striae per half-whorl. It differs from Dombarites acicularis (Pareyn) in having a different suture in maturity and possessing fewer longitudinal striae.

Dimensions (in mm)

RGM — holotype at 4.5 m topotype

298 616 298 615

D 34 24 40

W c. 20 c. 15 24

H 16 c. 8 16

h 6 4.5 6

U 5? — 9

Occurrence — In the Genicera Formation at Revilla de Santullán, loc. 134 at 4.5 m above the base, at loc. 1711 and loc. 1710 in association with Goniatites granofalcatus of late Viséan age (Goy, P2, or Q v 3 Zone).