Conus (Eoconus)
vanhoutenae (Landau et al., 2020)
Type material (1)
Holotype NHMW 2016/0103/1302, height 35.1 mm, width 18.7 mm;
paratype 1 NHMW 2016/0103/1303 (juvenile);
paratype 2 NHMW 2016/0103/ 1892, height 33.4 mm, 15.9 mm, St-Clément-dela-Place.
Paratype 3 NHMW 2016/0103/1893, height 17.5 mm, 9.3 mm (juvenile), Renauleau.
Paratype 4 RGM.1352389, height 12.2 mm, width 7.0 mm;
Paratype 5 RGM.1352390, height 9.5 mm, width 9.3 mm;
Paratype 6 RGM.1352475, height 11.0 mm, width 5.8 mm;
Paratype 7 RGM.1352581, height 22.9 mm, width 11.5 mm, Sceaux-d’Anjou.
Other material (1)
Maximum height 38.1 mm, width 20.7 mm. St-Clément-de-la-Place: NHMW 2016/0103/1304 (10
juveniles), RGM.1352385 (7 juveniles), RGM.1352394 (1 juvenile), RGM.1352431 (3
juveniles), LC (5 juveniles), FVD (12 juveniles). Sceaux-d’Anjou: NHMW 2016/0103/1899 (3 subadult +
5 juveniles), RGM.718201 (2 adults + 6 subadults + 50+ juveniles), RGM.1352391
(5), RGM.1352474 (16 juveniles), RGM.1352534 (21 juveniles); RGM.1352582 (2
juveniles), LC (4), FVD (1 adults + 2 subadults + 5 juveniles). Renauleau: LC (2).
Etymology – Named after Mieke Visser-van Houten,
volunteer at the Naturalis Biodiversity Center, Leiden, The Netherlands. Eoconus gender masculine (1).
Locus typicus – Le Grand Chauvereau,
St-Clément-dela-Place, Maine-et-Loire, NW France (1).
Stratum typicum – Tortonian, upper Miocene (1).
Diagnosis (1) – Eoconus
species of
medium size, paucispiral protoconch, angular spire whorls with carina placed
just above suture, coarsely beaded early teleoconch whorls, fading by 5-6
whorl, strong spiral cords on subsutural platform, regularly conical last whorl
with a few cords restricted to base (1).
Description (1) – Shell medium-sized, with depressed,
straight to slightly coeloconoid, scalate spire. Protoconch paucispiral,
consisting of two smooth whorls, with large globular first whorl. Junction with
teleoconch sharply delimited. Teleoconch of up to eight whorls. Spire whorls
with flat to weakly concave subsutural platform bearing 4-5 strong spirals,
roundly angled at beaded carina placed a short distance above suture, beads
prominent extending adapically, crenulating suture. Suture impressed.
Abapically whorls become more depressed, beading weakens, subobsolete by 5-6
whorls where they become broad undulations at shoulder. Last whorl regularly
conical with maximum diameter just below shoulder, hardly constricted at base
bearing 8-9 narrow cords over base, strengthening abapically. Subsutural
flexure of medium depth, strongly curved, strongly asymmetrical. Aperture
moderately narrow, anteriorly broadening; siphonal canal moderately short,
nearly straight; fasciole not well demarcated, weakly swollen with prominent
growth lines; inner lip twisted. No colour pattern preserved.
Discussion (1) – See Eoconus cambieni nov. sp.
We record Eoconus vanhoutenae nov. sp. from the Assemblage I localities
of St-Clément-de-la-Place, Sceauxd’Anjou and Renauleau.
Distribution (1) – Upper Miocene (Tortonian): Atlantic, NW France (this
paper).
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Conus vanhoutenae
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Conus cambieni
Holotype NHMW 2016/0103/1894 mm. 74,1 x 14,2 |
Conus cambieni Paratype NHMW 2016/0103/1896 mm. 37,1 x 19,2 |
Conus vanhoutenae NHMW
2016/0103/1302 mm. 35,1 x
18,7 |
Bibliografia Consultata