Reticunassa annabolteae, Galindo & Kool & Dekker, 2017

Galindo, Lee Ann, Kool, Hugo H. & Dekker, Henk, 2017, Review of the Nassarius pauperus (Gould, 1850) complex (Nassariidae): Part 3, reinstatement of the genus Reticunassa, with the description of six new species, European Journal of Taxonomy 275, pp. 1-43 : 28-31

Reticunassa annabolteae sp. nov.

urn:lsid:zoobank.org:act:781F25AD-B216-47A1-8084-FC46ED4C8029

Fig. 8 A–D, 9; Tables 1–2

Etymology

The species is dedicated to Mrs Anna Bolte, the second author’s partner and travel companion for more than 20 years.

Type material

Holotype

MADAGASCAR: ATIMO VATAE, stn BM06, South Madagascar , Ambatobe, Bavarama, 25°27.9′ S, 44°57.6′ E, 0–1 m, in rolling stones ( MNHN IM-2009-12843 , lv, sequenced, length 11.5 mm, width 5.3 mm).

Paratypes

MADAGASCAR: same collection data as holotype ( MNHN IM-2009-12812, MNHN IM-2009-12849, MNHN IM-2009-12862, MNHN IM-2009-12868, 4 lv; HK 302.01, 3 spm; HD 37306, 2 spm); S coast, Lavanono ( HK 302.05, 5 spm; HK 302.06, 2 spm).

Other material examined

MADAGASCAR: ATIMO VATAE, South Madagascar: stn BB03, Lavanono, 25°26.4′ S, 44°56.1′ E, 14–18 m ( MNHN IM-2009-12865, 1 lv); stn BM02, Ambatobe, Soamanitse, 25°27.4′ S, 44°57.4′ E, 0–1m ( MNHN IM-2009-12772, 1 lv); stn BM06, Ambatobe, Bavarama, 25°27.9′ S, 44°57.6′ E, 0–1 m ( MNHN IM-2009-12778, MNHN IM-2009-12783, MNHN IM-2009-12825, MNHN IM-2009-12841, MNHN IM-2009-12844, 5 lv); stn BM09, Saririaka, 25°29.0′ S, 44°59.6′ E, 0–1 m ( MNHN IM-2009- 12228, 1 lv); stn BM10, Andramara, 25°28.8′ S, 44°58.3′ E, 0–1 m ( MNHN IM-2009-12873, 1 lv); stn BS14, Cap Sainte Marie, 25°36.0′ S, 45°08.7′ E, 16 m ( MNHN IM-2009-12329, 1 lv); stn CP 3547, Cap Andavaka, 25°18.0′ S, 46°40.3′ E, 69–70 m ( MNHN IM-2009-12893, 1 lv); stn TM01, Monseigneur Bay, 25°02.1-2′ S, 46°59.9′ E, 0–1 m ( MNHN IM-2009-12793, 1 lv); stn TM05, Lokaro I., 24°56.5′ S, 47°07.1′ E, 0–1 m ( MNHN IM-2009-12306, MNHN IM-2009-12888, MNHN IM-2009-12889, MNHN IM-2009-12897, MNHN IM-2009-12899, MNHN IM-2009-12905, MNHN IM-2009-13087, 7 lv); stn TM08, NE of Evatra lighthouse, 24°58.7′ S, 47°05.9′ E, 0–1 m ( MNHN IM-2009-12894, 1 lv); stn TS09, Lokaro Bay, Fort Dauphin, 24°57.0′ S, 47°06.4′ E, 5–6 m ( MNHN IM-2009-12834, MNHN IM-2009- 12881, 2 lv); stn TS10, Lokaro Bay, Fort Dauphin, 24°56.8′ S, 47°06.6′ E, 7 m ( HK 302.02, 2 spm); stn TS21, Phare Flacourt, 25°01.5′ S, 47°00.0′ E, 2–4 m ( HK 302.03, 2 spm); stn TV07, Phare Flacourt, Amparihy, 25°01.3′ S, 47°00.2′ E, 12–16 m ( MNHN IM-2009-12885, MNHN IM-2009-12898, 2 lv). – South Madagascar ( HK 302.04, 1 spm); Lavanono ( HD 21156, 2 spm); Lavanono ( HD 36646, 21 spm); Soamanitse ( HD 20287, 3 spm).

Description

Holotype

PROTOCONCH. Paucispiral consisting of 1.5–1.75 broad, flattened, axially-striated whorls. Separation between protoconch and teleoconch indistinct ( Fig. 8D ).

SHELL. Elongate-ovate, consisting of 5.5 convex whorls, suture deep; axial ribs poorly developed, decreasing in height on body whorl; 16 ribs on penultimate whorl and 14 on body whorl; broad varix.

SPIRAL CORDS. Fine, weak compared to other species in genus, more pronounced where they cross axial ribs. Two anterior spiral cords more developed, resulting in two deep spiral grooves.

INTERCORDAL SCULPTURE. Very fine spiral striae between spiral cords.

APERTURE. Oval, inside outer lip 8 lirate denticles; columellar callus plicate throughout, somewhat elevated anteriorly, posteriorly slightly extended over body whorl; parietal denticle weak, anal canal wide; siphonal area with 4–5 low cords.

OPERCULUM. Yellowish, serrated.

SIPHONAL CANAL. Deep and narrow. Fasciole deep.

COLOR. Yellow-orange, narrow brown band above suture and broad brown band below periphery. Most spiral cords darker.

ADULT SIZE. 7.5–12.6 mm, usually 9–11 mm.

Remarks

Besides the variability in color, from off-white to yellowish-orange, the difference in size of adult specimens is remarkable. Some specimens have somewhat more developed spiral cords.

Comparison with some other Reticunassa species with a paucispiral protoconch: R. tringa is a smaller, more bulbous species with a pointed protoconch; R. goliath sp. nov. also has fine spiral cords as found in R. annabolteae sp. nov., but differs in its pointed protoconch; R. intrudens sp. nov. has a protoconch intruded by the teleoonch spiral cords; R. zanzibarensis ( Kool & Dekker, 2007) has a smooth protoconch contrasting the axially-striated protoconch in R. annabolteae sp. nov.

Habitat

Intertidal to 70 m, frequently between 0 and 10 m. Some specimens were found living on rocky platforms with algae, associated to eunicid tubes, coarse sand, and rolling stones.

Distribution

Only known from southern Madagascar ( Fig 9 ).

Figures

Fig. 8. Shells of Reticunassa Iredale, 1936. – A–D. Reticunassa annabolteae sp. nov. A–C. Holotype, MNHN IM-2009-12843, length 11.5 mm, width5.3 mm, S Madagascar,Ambatobe, Bavarama,25°27.9′ S, 44°57.6′ E, 0–1 m. D. Protoconch. – E–H. R. goliath sp. nov. E–G. Holotype, MNHN IM-2000- 22724, length 15.5 mm, width 7.9 mm, New Caledonia, Nouméa, leg. D. Massemin, ex coll. H. Kool. H. Protoconch of paratype, MNHN IM-2000-28394. – I–L. R. intrudens sp. nov. Holotype, MNHN IM-2000-22726, length 7.9 mm, width 4.3 mm, New Caledonia, Touho, 20°44′ S, 165°14′ E, 49–59 m. L. Protoconch. – M–P. R. thailandensis sp. nov. M–O. Holotype, ZMA Moll.4.09.047, length 7.35 mm, width 3.8 mm, Thailand, Gulf of Thailand, 6°40.313′ N, 101°43.852′ E, 3–15 m. P. Protoconch. Scale bars: D, H, L, P = 200 µm.

Fig. 9. Geographical and bathymetrical distribution of Reticunassa annabolteae sp. nov. Star indicates type locality. Each bar represents all lv or dd specimens.