Sonninia Douvillé, 1879

Sandoval, José, 2022, Sonniniidae Ammonitina, Middle Jurassic from Southern Spain: taxonomic, biostratigraphical and palaeobiogeographical analysis, Geodiversitas 44 (27), pp. 801-851 : 809

Genus Sonninia Douvillé, 1879

Sonninia Douvillé, 1879: 92 .

Waagenia Bayle, 1878 : pl. 84, non Kriechbaumer, 1874 (insect).

TYPE SPECIES. — Waagenia propinquans Bayle, 1878 ( Bayle 1878: pl. 84, fig. 1 [OD]).

DESCRIPTION

The following description is modified from the Treatise ( Howarth 2013). Evolute planulate shells, becoming more involute and compressed on larger whorls. The whorl section is rounded initially, becoming more or less compressed on outer whorls, with a strong keel on rounded or arched venter. The ribs and tubercles are highly variable. The ribs are often strong, mainly on inner whorls, but may be irregular. Large, well-spaced midlateral tubercles or spines occur at least on early and middle whorls. This genus is dimorphic, but some small forms (mesoconchs), which have plain mouth borders, are undefined. Others have lateral lappets and, like the corresponding macroconchs, can have non-tuberculate, tuberculate, and even spiny internal whorls.

REMARKS

Howarth (2013: 115) states that the author of Sonninia is Douvillé, not Bayle, as assumed previously, becauseDouvillé (1879: 92) was the author of the note in which S onninia was proposed as a replacement for Bayle’s preoccupied genus Waagenia .