Trivellona schepmani, (Schilder, 1941)

TriƲellona schepmani (Schilder, 1941) View in CoL

Fig. 7 View Fig

Trioia sibogae forma minor Schepman, 1909: 140, pl. 11, fig. 4 [name preoccupied].

Pseudotrioia schepmani Schilder,1941 View in CoL – Cate 1979:35, pl. 9, figs 35, 35a.

Trioellona schepmani (Schilder, 1941) View in CoL − Fehse & Grego 2004, 2009: 29, pl. 4, fig. 21, pl. 6, fig. 29, pl. 8, fig. 39; appendix IV, figs S.1, S.2.

Non Trioellona schepmani (Schilder, 1941) View in CoL – Dolin 2001: 229, text figs 20a, 20b [= Trioellona bealsi Rosenberg & Finley, 2001 View in CoL ].

Non Trioellona schepmani (Schilder, 1941) View in CoL – Fehse & Grego 2004, 2009: pl. 3, figs 14-16 [= Trioellona enricoschaeabei spec. nov. herein].

Types. Lectotype: “ East of Sailus-Besar , Paternoster Islands, Netherlands East Indies; in up to 36 metres of water; coral and Lithothamnion bottom” ( Schepman 1909: 140) . – Paralectotypes: “Stat. 095. Siboga Expedition 1899-1900, Philippines, Sulu Sea ; 5°43.5'N, 119° 40' E, stony bottom, dredged at 522 m; 26.vi.1899.” ( Schepman 1909: 140), Naturalis Leiden, RMNH, Mol. 97289 GoogleMaps .

Remarks

Schepman (1909: 140) already noted differences among his type specimens of Trioellona sibogae when he wrote, “ Two specimens from Stat. 95 are still smaller, being only 7 1 / 2 Mill. in length,... the ribs are slightly coarser, the teeth of the right margin less numerous (15 and 17),... I prefer to keep them under one name with the variety [minor], instead of describing a new species...”. The name ‘Trioia minor’, however, was a preliminary homonym being preoccupied by Trioia pulex var. minor Dautzenberg, 1889 . Schilder (1941:74) renamed Schepman’ s ‘Trioia minor’ as Pseudotrioia schepmani without examining the type specimens. We confirmed Schepman’ s observations ( Fehse & Grego 2004: 30).

The lectotype (designated by Cate 1979) of Trioellona schepmani was re-described in Fehse & Grego (2004). Additional specimens of T. sibogae and T. schepmani were identified and studied especially from off Aliguay Island near Dipolog, NE Mindanao, Philippines ( Fehse & Grego, 2004). Schepman’ s paralectotypes 1 to 3 (ZMA 03.09. 027 and ZMA 03.09.028) of Trioia sibogae Schepman, 1909 were provisionally assigned to Schilder’ s T. schepmani . In 2004 we already observed the inflated shells of the paralectotypes, but we explained them as intraspecific.

Also now we could base our research on the lectotype of T. schepmani only on the photos in Cate’ s review of the Triviidae (1979: pl. 9, figs 35, 35a), because the lectotype is still not returned since 2001 (pers. comm. with H. Dekker and R. Moolenbeek, March 2011). The examined paralectotypes 1 to 3 of T. schepmani are consistent with the Chinese shells that are studied herein (see below). Since 2004, several dozen further specimens of T. schepmani could be studied and the distinguishing features are persistent (see below) to the new species. Therefore, the new taxon is described in this study as Trioellona enricoschaeabei spec. nov.