Mangelia attenuata ( Montagu 1803 )

Öztürk, Bilal, 2021, Mangelia (Gastropoda, Conoidea) species of the Turkish coasts with description of Mangelia vanaartseni sp. nov., Zootaxa 4933 (2), pp. 241-262 : 244

Mangelia attenuata ( Montagu 1803)

( Fig. 1 )

Murex attenuatus Montagu 1803: 266 , Pl. 9, fig. 6

Materials: 08. 11.1997, Izmir Bay, Aegean Sea , Posidonia oceanica (sea grass), 20 m, 2 spm ( ESFM-GAS/97-21 ) ; 09.03.2000, Izmir Bay, Aegean Sea , mud, 59 m, 2 sh. ( ESFM-GAS /2000-163 ) ; 12.04.2000, Izmir Bay, Aegean Sea , sandy mud, 15 m, 1 spm + 1 sh. ( ESFM-GAS /2000-164 ) ; 10.04.2001, Izmir Bay, Aegean Sea , P. oceanica + mud, 18 m, 1 sh. ( ESFM- GAS /2001-39 ) ; 06.10.2005, Fethiye Bay, Levantine Sea , sandy mud, 25 m, 1 spm + 1 sh. ( ESFM- GAS/2005-98 ) ; 08.06.2013, Sea of Marmara , mud, 50 m, 1 spm ( ESFM-GAS/2013-66 ) ; 13.06.2013, Sea of Marmara , sandy mud with shell fragments, 100 m, 1 spm ( ESFM-GAS/2013-65 ) ; 14.06. 2013, Sea of Marmara , mud with shell fragments, 50 m, 1 sh. ( ESFM-GAS/2013-70 ) .; 20.06.2013, Sea of Marmara , mud with shell fragments, 50 and 100 m, 3 spm ( ESFM-GAS/2013-64 ) ; 24.06.2013, Sea of Marmara , mud, 50 m, 1 spm ( ESFM- GAS/2013-71 ) ; 25. 08. 2014, G̹ll̹k Bay, Aegean Sea , sandy mud, 46 m, 1 spm ( ESFM-GAS/2015-29 ) ; 25.10.2014, Ildır Bay, Aegean Sea , sandy mud, 65 m, 1 spm ( ESFM-GAS/2014-46 ) ; 26.10.2014, Akköy, Aegean Sea , sandy silt, 67 m, 2 spm ( ESFM-GAS/2014-45 ) ; 27.10.2014, G̹ll̹k Bay, Aegean Sea , sandy mud, 48 m, 1 spm ( ESFM- GAS/2014-42 ) ; 07. 02. 2015, Ildır Bay, Aegean Sea , sandy silt, 62 m and 66 m, 2 spm + 1 sh. ( ESFM-GAS/2015- 30 ) ; 15.12.2015, G̹ll̹k Bay, Aegean Sea , sandy mud, 44 and 50 m, 4 spm ( ESFM-GAS/2015-28 ) ; 16.02.2015, G̹ll̹k Bay, Aegean Sea , sandy mud, 47 m, 2 spm ( ESFM-GAS/2015-27 ) ; 24.04.2015, Izmir bay, mud with shell fragments, 6 m, 2 spm ( ESFM-GAS/2015-24 ) ; 11.08.2016, Saros Bay, Aegean Sea , mud with shell fragments, 43 m, 1 spm ( ESFM-GAS/2016-20 ) ; 28.08.2019, G̹ll̹k Bay, Aegean Sea , mud+sand+shell fragments, 33 and 38 m, 3 spm ( ESFM-GAS/2019-17 ) .

Remarks: Shell with multispiral protoconch. Teleoconch sculpture consists of orthocline and flexuous axial ribs and flexuous growth lines. On the body whorl 9 axial (rarely 8) ribs. The species is a quite similar to Mangelia tenuicosta . In some references (e.g., Gruppo Malacologico Livornese and Gruppo Malacologica Romagnolo 2005) the presence of incised striae in M. attenuata has been noted as a diagnostic difference between the two species. However, this feature does not seem to reliably distinguish these species because it was only evident (under x 40 magnification) on all teleoconch whorls in just one specimen, whereas the majority of the specimens exhibited axial ribs that were smooth or with evident striae on the earlier 1–3 whorls only. Shell height up to 10 mm.

Distribution: Eastern Atlantic Ocean and Mediterranean Sea ( Gofas et al. 2011). Turkish coasts: Levantine Sea, Aegean Sea and Sea of Marmara (Özt̹rk et al. 2014).

Figures

FIGURE 1. Mangelia attenuata: ventral (A, C, D, E) and dorsal (B) views of four specimens and protoconch (F) of specimen A (A=B=9.9 mm, Izmir Bay, 20 m; C=7.0 mm, Izmir Bay, 6 m; D=6.8 mm, G̹ll̹k Bay, 46 m; E=7.3 mm, Fethiye Bay, 25 m).