Muricodrupa? trigonostoma ( Boettger, 1906 )

Harzhauser, Mathias, Landau, Bernard M. & Merle, Didier, 2025, The Muricidae (Gastropoda, Muricoidea) of the Miocene Paratethys Sea (Aspellinae, Ergalataxinae, Coralliophilinae, Rapaninae), Zootaxa 5611 (1), pp. 1-106 : 56-57

publication ID	https://doi.org/10.11646/zootaxa.5611.1.1
publication LSID	lsid:zoobank.org:pub:78FDE0BC-8C7A-4E67-B387-71A58ADD333D
persistent identifier	https://treatment.plazi.org/id/039A879F-FFFB-FFBB-2785-D30DFE24FEE1
treatment provided by	Plazi
scientific name	Muricodrupa? trigonostoma ( Boettger, 1906 )
status

Treatment

Muricodrupa? trigonostoma ( Boettger, 1906)

Figs 33 View FIGURE 33 , 34A View FIGURE 34 1 –A View FIGURE 1 3 View FIGURE 3

* Pollia trigonostoma n. sp. — Boettger 1906: 31.

Cantharus (Pollia) trigonostomus (Boettger) — Zilch 1934: 255, pl. 16, fig. 95.

Cantharus (Pollia) trigonostomus ( Boettger, 1906) — Atanacković 1985: 148, pl. 33, figs. 15–16.

Type material. Lectotype designated by Zilch (1934: 255), SMF 373158 (old number: 12.2244a, Senckenberg Museum, Frankfurt/Main, Germany, SL. 5.5 mm, MD: 3.6 mm, CoŞteiu de Sus ( Romania), illustrated in Zilch (1934: pl. 16, fig. 95), figs. 34A 1 –A 3.

Revised description. Small, solid, stocky biconic shell; apical angle 60°. Protoconch unknown. Teleoconch of up to four whorls. Suture weakly incised. Spire whorls with broad, straight-sided subsutural ramp, shoulder placed short distance above suture. Axial sculpture of eight prominent ribs separated by slightly wider interspaces. Subsutural ramp with four broad, close-set spiral cords (including SP, adis, IP and abis). P1 swollen over ribs. P2 and weak s1 intercalated on second half penultimate whorl. Last whorl attaining 73% of total height, with broad, steep subsutural ramp, marked shoulder angulation, conical below. Eight axial ribs, prominent over subsutural ramp, fading over base. Five spiral cords (SP, adis, IP, abis and a tertiary cord) of equal strength on subsutural ramp. P1, P2 and P3 most prominent forming coarsely cancellate sculpture with axial ribs; P4, P5, P6 slightly weaker; s1–s5 weak. Fasciole weakly swollen, delimited by narrow groove. Aperture wide, pyriform. Outer lip thickened with three subequal rounded denticles (D1 to D3) placed some distance behind peristome. Anal canal wide, indistinct. Siphonal canal moderately short, wide, open, slightly bent to the left. Columella weakly excavated, smooth, weakly twisted at siphonal canal. Columellar callus forming narrow, adherent rim.

Discussion. This species is based on a specimen showing juvenile characteristics such as a small size, the absence of D4 and an anal canal that has not yet formed. Its sculpture displaying three prominent cords (P1 to P3) and its biconic shape are reminiscent of some extant West-African Coralliophilinae such as Coralliophila schiottei Smriglio & Mariottini, 2000 from Cameroon and C. raramaculata Kosuge & Fernandes, 1989 from Sâo Tomé. However, the presence of rounded denticles within the outer lip is not characteristic of the Coralliophilinae which bear smooth or lirate apertures. The shape of this specimen is also reminiscent of the extant Muricodrupa fenestrata (de Blainville, 1832) , from the Indo-West Pacific Region, but its sculpture is not fenestrate, D4 is missing, and the anal canal is not formed. For these reasons, we place this species provisionally and with doubt in Muricodrupa . The extant Muricodrupa anaxares (Kiener, 1836) , from the Red Sea and Indian Ocean, differs in its narrower aperture and large blunt tubercles.

Paleoenvironment. Unknown.

Distribution in Central Paratethys. Badenian (Middle Miocene): Southern Pannonian Basin: Hrvaćani ( Bosnia and Herzegovina) ( Atanacković 1985); Făget Basin: CoŞteiu de Sus ( Boettger 1906).

Genus Orania Pallary, 1900

Type species. Murex spadae Libassi, 1859 View in CoL [= Orania fusulus ( Brocchi, 1814) View in CoL ]; original designation by Pallary (1900: 285). Pleistocene, Italy.