Triviidae descriptions , Natura Mediterraneo

Messaggio originario di myzar:

Here are some:

Trivia levantina:
Shell ovately cylindrical, moderatele pyriform, slightly broader at shoulder than anteriorly. Shells range from 6.4 to 7.5 mm in length, the holotype (Figs 20-23) measures 6.5 mm in length, 4.6 in width and 4.2 in height. The broad medially thickened labrum extends slightly beyond the lateral profile on the body whorl and bears 17-18 coarse labral denticles (18 in the holotype). These denticles are equally spaced on the inner edge, they continue over the shell dorsum, as uninterrupted transverse ribs, only rarely interrupted. They range in the number of 20-25 (20 in the holotype) and terminate reaching the mediodorsal depression. In general, the sulcus is very pronounced, but in some shells is less evident and in these cases the ribs only fiatten smoothly to reappear at the edges of it. The dorsal ribs cross the body shell and reach the columella. The peristome bears 14-16 columellar denticles (14 in the holotype) and shows a very pronounced fossula which extends on about half of the aperture. This is narrow, uniformely spaced along its length and recurved at both extremities. Mature shells have a concealed spire and the posterior terminal is covered with ribs which radiate from the medio-dorsal sulcus, young specimens show a protruding spire. Colour pattern very constanti glossy, redbrown dorsally, columella and labrum milky white with the anterior and posterior terminals pink, the transverse ribs dorsally are pale beige, resulting more evidenti almost whitish, on the anterior and posterior terminals.

Trivia spongicola:
I primi esemplari furono scoperti nelle spugne di Sfax, pellucidi, vinitinti e poco caratteristici, per cui attribuiti ad altre forme Mediterranee. Recenti esemplari di Zuetina che mostrano la loro scultura tutta propria ed il solco dorsale ben appariscente e differiscono da T. Mollerati, coralligena e dei fondi fangosi. E' più allungata di questa e meno globosa. Rari esemplari

Trivia multilirata:
C. testà roseà, immaculata, qùam C. Europea magis globosa; costellis nùmerosis, acùtis, haud tantum radiantibus; coIumellae varice postico parvo, acuto, conspìcuo. Hab Adriatic

Trivia pulex:
Testa ovata, subventricosa, fusca, immaculata ; striis longitudinalibus laevibus; linea dorsali impressa; apertura lineari, postice subproducta; dentibus subaequalibus basique submarginata albis.

myzar

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