Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)
Measurements lectotype H **27 HL 4.7 HP 2.4 D 7.8 W 4.3 AA **p9 AL 21° Shape — Turriculate — extremely high trochiform shell consisting of numerous, low, feebly convex or flush whorls (their number in reconstructed shell: —25—27). Suture runnung in shallow, asymmetrical canal of much steeper adapical than opposite side. Periphery sharply angulate; base slighdy convex and anomphalous. Peristome discontinuous, columellar lip short and its abapical part subglobularly swollen. Thickening connected to base bv narrow neck and delimited from base by angulation on juvenile shells and by thin thread on adults. This nodule expanded in growth direction and also inwards aperture (not cleanable perfectly). Sculpture — Early whorls of available specimens bear three tubercled cords. One of them running just on peripher} 7 but remains visible close above suture. Other ones formed below and above midwhorl, respectively. Lowermost (abaxial) one gradually becoming carina while others weaken on latest (4—5) whorls and, simultaneously, tubercles disappear. Tubercles spirally elongate; less on early, more distinctly on later whorls. Weak, prosocline (collabral) ridges connect each tubercles to one of those, sitting on neighbouring cords. On adult whorls, ridges observable also without tubecles. Excepting single, distinct outermost thread, base sculptured by obscure spiral lines. Growth-lines prosocline on whorls and markedly opisthocyrt on base. Remarks — In spite of the highly turriculate shell, the trochiform outline well recognisable. The shape and the columellar characters suggest belonging to genus Dimorphotectus. However, it is important to call the attention to the similarity to some Trypanotrochus species, manifested mainly in the turriculate shell and the granulate ornament. Distribution — Hallstatt, Hierlatz Alpe, Upper Sinemurian (Oxynotum Zone). Figure 64 — Dimorphotectus simonyi (HÖRNES, 1853); lectotype and a paralectotype. — 17 a-c: copy of STOLICZKA'S (1861) original figures from Tafel I; A—D: lectotype in "apertural" and basal views, C-D = xl; A-B = x3; E—F: a paralectotype (GBA 2008/69/14/2) in lateral view, F = X 1, E = X3.5. Dimorphotectus? attenuatus (STOLICZKA, 1861) (Figure 65) 1861: Trochus attenuatus STOL. — STOLICZKA, p. 171, pi. 2, fig. 1. Lectotype — GBa 2008/69/17/1 (selected here). Material — Two original specimens without apex and peristome. Measurements H lectotype HL *4.4 HP **2.3 D *4.2 W *2. AA 18° AL 20° Figure 65 — Dimorphotectus? attenuatus (STOLICZKA, 1861), lectotype. — 1 a-b: copy of the original figures of STOLICZKA's (1861) Tafel II; A-C: the lectotype in dorsal (A), "apertural" (B) and basal (C) views, Xl.5. Shape — High conical (turriculate) shell of somewhat convex whorls, separated by asymmetrically canaliculate suture. Peripher} 7 rather sharply angulate, bicarinate; base feebly convex, anomphalous. Upper peripheral carina stronger and visible on all whorls, suture follows lower carina, remaining sometimes exposed. No peristome part preserved. Sculpture — Above peripheral ones, two carinae or three cords provide further spiral sculpture elements. All of them tubercled; one tubercle of each row connected to neighbouring ones by low, prosocline, collabral ridges. Base covered by thin spiral threads. Remarks — The two specimens are rather different, they may be representatiA T es of two species. One specimen has conical shell while the other is cyrtoconoidal.
