Reticunassa thailandensis, 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 : 36-38

Reticunassa thailandensis sp. nov.

urn:lsid:zoobank.org:act:E0731396-9A77-4C1C-99F7-24B72E5B55DD

Fig. 8 M–P, 12; Table 2

Etymology

This species is named after Thailand, the type locality.

Type material

Holotype

THAILAND: SE coast, Gulf of Thailand, Pattani Province, Ko Lopi , 06°40.313′ N, 101°43.852′ E, scuba diving, 3–15 m, leg. R.G. Moolenbeek and H. Dekker, 2003 ( ZMA.Moll.4.09.047 , length 7.35 mm, width 3.8 mm).

Paratypes

THAILAND: same collection data as for holotype ( ZMA.Moll.4.09.048, 222 spm; 5 spm; MNHN IM- 2000-32481, 10 spm; GH, 2 spm; HD 24145, 6 spm; HK 139.01, 6 spm); Gulf of Thailand, Rayong Province, Talengam, near Suan Son, E of Ban Phe beach, leg. O.K. McCausland ( HK 139.03, 1 spm).

Other material examined THAILAND: Gulf of Thailand: type locality (4 spm); Ban Pak Nam Sakom, local fishery, 06°57′ N,

100°49.36′ E ( ZMA.Moll.4.09.062, 3 spm; HD 1789, 6 spm); Ban Pak Nam Sakom, near Leela Resort, 06°57.4′ N, 100°51.6′ E, muddy pools ( ZMA, 3 spm; HD 1190, 6 spm); Ban Talokapo, 06°54.0′ N, 101°22.4′ E, local fishery ( HD 2146, 3 spm); Trat Province, Ko Chang, beach ( HD 2793, 1 spm); Ko Samui, NE side of Chaweng Beach, 09°32.6′ N, 100°05.7′ E, in seagrass ( HD 9572, 5 spm); Ko Samui, Ban Bangkao, 09°25. 2′ N, 99°59.7′ E, sand flat ( HD 9574, 1 spm); Ko Kham, 06°58.4′ N, 100°51.6′ E,

scuba diving, 3–5 m ( ZMA.Moll.093866, 14 spm); Pattani, in shell grit ( ZMA.Moll.098947, 2 spm); off Pattaya, Ko Lan, scuba diving, reef, 3–6 m, leg. R.G. Moolenbeek ( ZMA.Moll.4.09.063, 12 spm).

SINGAPORE: Bedok River area of East Coast Park, beached, leg. Chan Sow Yan ( HK 139.04, 6 spm).

MALAYSIA: E coast, South China Sea, 02°38′11″ N, 105°13′30″ E, 30–35 m, leg. H. Morrison ( GH, 2 spm; HK 139.02, 3 spm); South China Sea, on sand near wreck, 0°45′15″ N, 105°36′11″ E, leg. H. Morrison ( GH, 1 spm).

INDONESIA: Laboratorium Onderzoek der Zee, 1938, stn Bat38/07a, Bay of Jakarta ( ZMA. Moll.096217, 2 spm). – KEPULAUAN SERIBU 2005, stn Ser05/03, Java, Bay of Jakarta, Damar Kecil, 5°59′00″ S, 106°50′43″ E, scuba diving, 5–15 m ( ZMA.Moll.175169, 7 spm); stn ser05/07, Java, Bidadari, scuba diving, 6°01′55″ S, 106°44′47″ E ( ZMA.Moll.175470, 12 spm); stn ser05/08, Java, Ayer Besar, 6°00′06″ S, 106°46′48″ E ( ZMA.Moll.154506, 1 spm); stn ser05/09, Java, Ubi Besar, scuba diving, 5°59′55″ S, 106°44′23″ E ( ZMA.Moll.175172, 8 spm); stn ser05/10, Java, Kelor, scuba diving, 5°51′00″ S, 106°35′05″ E, 5–35 m ( ZMA.Moll.175173, 3 spm). – Java, W coast, Tjilintjing ( ZMA.Moll.096215, ex coll. Butot 12405, 1 spm); Flores, E coast, near Larantuka, between Weri and Waibalun, leg. Fr.M. Vianney ( ZMA.Moll.096211, 1 spm); Kalimantan, South China Sea, Pejantan I., 0°30′48.8″ N, 107°13′24″ E, 10–20 m, leg. H. Morrison ( GH, 5 spm); NETHERLANDS BERAU 2003, stn ber03/38, Berau Is, Maratua, 10–25 m ( ZMA.Moll.175049, 1 spm).

PHILIPPINES: Palawan, Balabac I. ( RMNH, 5 spm; 5 spm; HD 24144, 20 spm; GH, 6 spm; HK 139.05, 140 spm; coll. L. van Gemert, Zeist, the Netherlands, 20 spm; AMD,>300 spm); Olango I., Ziczac Point, 10–20 m, 2010 ( HD 33413, 1 spm); Mindanao, Surigao del Norte, Basul I., 80–90 m, 2013 ( HD 33414, 1 spm).

Description

Holotype

PROTOCONCH. Bulbous, flattened, paucispiral, 1.3 whorls, whitish, part of body whorl with growth lines.

SHELL. Teleoconch consisting of 4.5 impressed whorls.Axial ribs pronounced, rounded, 14 on penultimate and 13 on body whorl. Varix strong and broad.

SPIRAL CORDS. Continuous, narrow, thread-like spiral cords, increasing in height where they cross over axial ribs; 6 on penultimate and approximately 9 on body whorl. Spiral cord on periphery, the two above it, and the three at the base of body whorl more distinct; intercordal distances unequal.

INTERCORDAL SCULPTURE. Fine, distinct spiral striae, number depending on distance between spiral cords.

APERTURE. Oval, outer lip with 8 unequal denticles, one near periphery strongest. Columellar callus well bordered, slightly extending over body whorl; entire lip with short lirae. Parietal denticle strong.

OPERCULUM. Yellowish, finely serrated.

SIPHONAL CANAL. Narrow; fasciole strong. Siphonal area with approximately 4 cords; parietal denticle strong, anal canal wide.

COLOR. Yellowish-orange, penultimate whorl with two, body whorl with three orange-brown bands.

ADULT SIZE. 5.5–9.1 mm, usually 7–8 mm. One of the smaller species of the group.

Remarks

The color is variable. Well-preserved specimens are cream or orange to light brown, either unicolor or with several darker-colored spiral cords. Occasionally remnants of bands are only present on the varix and on the fasciole.

The main difference between Reticunassa intrudens sp. nov and R. thailandensis sp. nov. is to be found in the protoconch morphology: the former has a protoconch with axial striae, in the latter it is partly smooth. Both are paucispiral and bulbous, and lack the microscopic pustules found in the other species described in this paper. R. paupera ( Gould, 1850) , R. visayaensis sp. nov. and R. poppeorum sp. nov. have a multispiral protoconch. R. thailandensis sp. nov. has more well developed spiral cords than the other species described here. Furthermore, in some specimens the 2–3 most anterior spiral cords are more strongly developed. In general, the distribution of the species, as shown on Fig. 12 , might help with the identification.

Habitat

This species lives in sand and between dead corals, in depths of 1–90 m, usually found between 15 and 20 m.

Distribution

Thailand, Singapore, Malaysia, Indonesia, and the Philippines, where it is common at Balabac I., but apparently rare in the central Visayas ( Fig. 12 ).

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