Mangelia tenuicosta ( Brugnone 1862 )

Öztürk, Bilal, 2021, Mangelia (Gastropoda, Conoidea) species of the Turkish coasts with description of Mangelia vanaartseni sp. nov., Zootaxa 4933 (2), pp. 241-262 : 253

Mangelia tenuicosta ( Brugnone 1862)

( Fig. 15 )

Pleurotoma attenuatum var. tenuicosta Brugnone 1862: 25 , fig. 17.

Materials: 03.02.2009, Mersin Bay, Levantine Sea , mud, 72 m, 2 spm ( ESFM-GAS/2009-53 ) .

Remarks: The shell shape of the species is very similar to Mangelia attenuata , from which it differs by its narrower and flexuous axial ribs, thinner conical teleoconch shape and longer siphonal canal. Some references have noted the lack of incised striae in M. tenuicosta as a distinguishing feature. However, many of the individuals of M. attenuata investigated in the present study did not have incised striae on the teleoconch whorls or the striae were present on earlier whorls only. Therefore, the feature does not seem to be reliable for differentiating these species.

Distribution: Eastern Atlantic Ocean and Mediterranean Sea ( GBIF 2020). Turkish coasts: Levantine Sea ( Aslan & Ovalis 2017).

Figures

FIGURE 15. Mangelia tenuicosta: ventral (A, C) and dorsal (B) views of two specimens and protoconch (D) of specimen A (A=B=10.3 mm, C=5.3 mm).