Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 75. (Budapest 1983)

Vörös, A.: Some new genera of Brachiopoda from the Mediterranean Jurassic

The subfamiliar status of Kericserella is even more problematic. Presently, the family Basiliolidae is divided into three subfamilies: Basiliolinae (with broad outer hinge plates), Aetheiinae (with thick inner hinge plates) and Aphelesiinae (with crura attached directly to the side of socket ridges), their time-ranges are Late Cretaceous — Recent with the exception of the Basiliolinae which was extended by DAGYS (1974) back to the Permian. None of these subfamilies is really suitable for Kericserella. Basiliolinae has the necessary time-range but is different internally; Aphelesiinae shows similar internal features but is known only from the Cenozoic. So, if in addition we consider the rather characteristic external appearance of Kericserella we may establish a new subfamily for it in the future. It is interesting to note in this respect that from among the rhynchonellid genera reviewed in the "Treatise" the Devonian Nyege happens to show a strong external resemblance to Kericserella, and they are not very different internally, either. This genus (regrettably, distant in time) is suspected to be the ancestor of the possible new subfamily. Distribution : Pliensbachian of the Mediterranean Region (Appennines, Southern Alps, Hungary, Greece?). Order TEREBRATULIDA WAAGEN, 1883 Suborder TEREBRA TU LIDIN A WAAGEN, 1883 Superfamily Terebratulacea GRAY, 1840 Family Terebratulidae GRAY, 1840 Subfamily Plectoconchinae DAGYS, 1974 In the original définition by DAGYS (1974), this subfamily contained only the type genus, the multiplicate Plectoconcha from the Upper Triassic; therefore the multiplication was considered diagnostic for the subfamily. The present author suggests to extend the Plectoconchinae both in time and content in order to include the Lower Jurassic genera Hesperithyris and the new genus to be described below. In this way the common features characterizing the subfamily remain: the rectimarginate appearance, the massive, incurved beak, the subhorizontal outer hinge plates and the prefalcifer crura. Genus Lychnothyris gen. n. Derivatio nominis: Lamp-shaped : lychnos (Greek) =lamp. Type species: L. rotzoana (SCHAUROTH, 1865) (monotypy). Diagnosis : Medium to large terebratulids, subcircular in outline, valves equally convex. Rectimarginate, smooth. Umbo prominent, massive, slightly incurved; beak ridges blunt, foramen mesothyridid. Muscle scars spoon-shaped. Cardinal process large, crenulated. Outer hinge plates horizontal, crura prefalcifer(?). Description : External characters (Fig. 12) (Representative figures of the type species : TAUSCH VON GLOECKELSTHURN 1890, pl. II, fig. 7, 8, 10, 11): At present Lychnothyris contains only its type species L. rotzoana. It is of medium to large size (sometimes exceeding 5 cm) with subcircular to oval outline. The two valves are nearly equally convex. Perfectly rectimarginate without any trace of fold or sulcus. The shell surface is smooth, there are no ribs or capillation only a few, irregularly spaced, growth lines are developed. The umbo is very prominent and massive, slightly incurved. The beak ridges are blunt and short. The foramen is very large, mesothyridid. The deltidial plates are fused, forming a thick symphytium. Internal characters (Fig. 5) — Pedicle valve: The delthyrial cavity is subcircular in cross-section with well-developed ventral muscle trough. The pedicle collar is strong. The deltidial plates form a thick symphytium. The hinge-teeth are massive, moderately long, a little expanded laterally, not crenulated. The denticula are very long and sharp. — Brachial valve: The cardinal process is very large, moderately crenulated. flat, with a little median trough, expanded laterally and anteriorly into the delthyrial cavity. Outer socket ridges are well-developed, high; inner socket ridges gently bend