Reticunassa visayaensis, 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 : 21-24

Reticunassa visayaensis sp. nov.

urn:lsid:zoobank.org:act:742DB3E4-4D0F-40DD-985C-948F113C4C65

Fig. 3 J–M, 6; Tables 1–2

Nassarius mamillatus – Martin 2008: 122, pl. 356, fig. 3 (non Preston).

Nassarius pauperus – Martin 2008: 126, pl. 358, figs 1–4 (non Gould).

Nassarius fuscolineatus – Martin 2008: 126, pl. 358, fig. 6 (non Smith).

Etymology

The name refers to the Visayas, a group of central Philippine Islands where this species is common.

Type material

Holotype

PHILIPPINES: lv, Panglao Island , 9°35.7′ N, 123°44.7′ E, 0–3 m, seagrass and hard bottom, length 9.5 mm, width 4.6 mm, sequenced ( MNHN IM-2007-31912 ).

Paratypes

PHILIPPINES: Panglao Island, Momo Beach, 9°36.1′ N, 123°45.2′ E, 0–3 m ( MNHN IM-2000- 28395, 9.2 mm; MNHN IM-2000 28405; MNHN IM-2000-28404, 3 spm); Panglao I. area ( HD 24336, 60 spm; HK 184.13, 2 spm).

Other material examined

PHILIPPINES: PANGLAO 2004: Panglao I., stn B8, Napaling, 9°37.1′ N, 123°46.1′ E, 3 m (2 spm); Panglao I., stn M1, Alona Beach, 9°32.9′ N, 123°50.5′ E, 5m (2 spm); Panglao I., stn M5, Doljo Point, 9°35.5′ N, 123°43.3′/ 123°44.3′ E, 0–2 m (1 spm); Panglao I., stn M7, Momo Beach, 9°36.1′ N, 123°45.2′ E, 0–3 m (2 spm); Panglao I., stn M9, near Doljo Point, 9°35.1′ N, 123°43.6′ E, 0.5 m (1 spm); Panglao I., stn M10, Bingag/Tabalong, 9°37.8′ N, 123°48.4′ E, 0–3 m (1 spm); Panglao I., stn M22, Napaling, 9°37.2′ N, 123°46.4′ E, 0–3 m (1 spm); Panglao I., stn M40, Looc, 9°35.7′ N, 123°44.7′ E, 0–3 m (1 spm); Panglao I., stn R19, Napaling, 9°37.1′ N, 123°46.1′ E, 2–54 m (2 spm); Panglao I., stn S24, Momo Beach, 9°36.1′ N, 123°45.0′ E, 2–4 m (1 spm); Pamilacan I., stn S42, 9°30.1′ N, 123°55.5′ E, 15–20 m (1 spm). – Cebu, leg. R. Martin ( ZMA.Moll.175495, 10 spm); Cebu ( HK 184.09, 1 spm; ZMA Moll. 080981, 1 spm); Cebu, Liloan, 50–150 m, 2013 ( HD 35803, 1 spm); Mactan I., Maribago, Buyon, in sandy tide pools, leg. O.K. McCausland ( HK 184.07, 1 spm); Punta Engaño, in tangle nets, 150 m ( HK 184.05, 3 spm); Punta Engaño, in coral rubble, 20 m ( HK 184.14, 3 spm); Punta Engaño ( HD 11610, 8 spm); Punta Engaño, 80–100 m ( HD 17300, 3 spm); Mactan I., Punta Engaño, 25–50 m ( HD 33879, 1 spm); Punta Engaño, leg. S.P. Kool, 2005 ( HK 184.11, 1 spm); Punta Engaño, 1–2 m, live ( HK 184.12, 2 spm); Punta Engaño, 25–30 m, 2009 ( AMD, 2 spm); Punta Engaño, 100–150 m, 2009 ( AMD, 2 spm); Balicasag I. ( HD 15930, 2 spm); Olango I., night dive, 20–25 m ( HD 17292, 3 spm); Olango I., 2014 ( HD 35872, 4 spm); Olango I., 20–25 m, 2009 ( AMD, 2 spm); Cuyo I., 15–20 m ( HD 35488); Calituban I., 10 m ( HK 184.01, 6 spm); SW side of Catanduanes, San Rafael, leg. S.P. Kool, 2005 ( HK 184.10, 1 spm); Aliguay I., tangle nets, 150–180 m ( HK 184.08, 2 spm); Palawan, 10–25 m, 2009 ( AMD, 2 spm).

INDONESIA: SNELLIUS 1929: Ternate I., 1–2 Apr. 1930 ( RMNH, 1 spm); Tidore I., 24–29 Nov. 1929 ( RMNH, 1 spm). – RUMPHIUS 1990: Ambon, stn 05 Leitimur, Ambon Bay, outer bay, Tg. Benteng ( RMNH, 2 spm); Ambon, stn 17, SE side of Pombo I. ( RMNH, 2 spm); Ambon, stn 20 Hitu, N coast, Hitulama ( RMNH, 1 spm); Ambon, stn 21 Hitu, N coast, Mamala ( RMNH, 2 spm); Ambon, stn 23 Hitu, Kaitetu (near Hila), 22–23 Nov. 1990 ( RMNH, 1 spm); Ambon, stn 26 Hitu, 4 km W of Kaitetu, 23 Nov. 1990 ( RMNH, 3 spm); Ambon, stn 27 Leitimur, S coast, Hutumuri ( RMNH, 1 spm); Ambon, stn 34 Hitu, Ruhmatiga 3–5 Dec. 1990 ( RMNH, 4 spm; HK 184.03, 1 spm). – LAGON, stn Seith, Karubar, Amboine, low tide (1 spm); South Moluccas, leg. Rijkschroeff ( ZMA.Moll.096203, ex coll. Butot 12403, 7 spm); South Moluccas, leg. Rijkschroeff ( ZMA.Moll.096204, ex coll. Butot 12404, 5 spm); Ceram, N coast, Seleman Bay, leg. H. Strack ( HK 184.04, 1 spm); Sulawesi, Lintido, leg. Semmelink ( ZMA.Moll.096205, ex coll. Schepman, 1 spm); Bali, Sanur, leg. K. van Duin, 1989 ( ZMA. Moll.099329, 1 spm); Bali, Kaliyasem, Lovina area, 8°09.7′ S, 115°01.7′ E, 1–2 m ( HK 184.16, 3 spm); Flores, Labuan Bajo, Binongko Beach, leg. J.N.J. Post ( HK 184.15, 1 spm); West Papua, Manokwari, near Uriami River, leg. D. Smits 1958/1961 ( HK 184. 02, 11 spm; HD 38514, 11 spm).

PAPUA NEW GUINEA: PAPUA NIUGINI: stn PM22, Sek I., 05°04.7′ S, 145°48.9′ E, 0–1 m ( MNHN IM-2013-13184; MNHN IM-2013-13192, 2 lv); stn PM19, Islet SE of Megas Islet, 05°05.4′ S, 145°48.6′ E, 0–1 m (2 spm); stn PB23, Lauhamug I., outer slope, 04°59.5′ S, 145°47.7′ E, 13 m (1 spm); stn DP31, Alexishafen, 05°05.3′ S, 145°48.1′ E, 1–6 m (4 spm); stn PM38, Biliau I., 05°11.8′ S, 145°48.2′ E (1 spm); stn PD78, Tabad I., 05°08.2′ S, 145°48.7′ E, 5 m (1 spm); stn PR202, S of Tab I., 05°10.3′ S, 145°50.3′ E, 2–4 m (2 spm).

Description

Holotype

PROTOCONCH. Smooth, multispiral, whitish-yellowish, consisting of 2.5 whorls. Beset with rows of minute pustules ( Fig. 3M ).

SHELL. Elongate-ovate, 5.5 postnuclear whorls, suture impressed. Penultimate whorl with 15 nearly equally pronounced, round ribs; body whorl with 14 ribs, decreasing in height or disappearing on ventral side. Varix broad and strong.

SPIRAL CORDS. Continuous, flat and narrow, 7 cords on penultimate, and 11 on body whorl, peripheral one somewhat darker.

INTERCORDAL SCULPTURE. Approximately 6 very fine, evenly spaced striae between spiral cords.

APERTURE. Oval, inside outer lip with 9 lirate denticles, peripheral denticle slightly more pronounced. Parietal denticle moderate, anal canal wide. Columellar callus wide, anteriorly somewhat elevated, posteriorly partly extending over whorl; well delineated border. Fine lirae over entire surface.

OPERCULUM. Yellowish, serrated.

SIPHONAL CANAL. Fasciole strong, siphonal area with 1 strong and 5 weak cords.

COLOR. Yellowish, most spiral cords reddish between ribs.

ADULT SIZE. 8.5–12.7 mm, usually 8.5–10.5 mm.

Remarks

The intraspecific variability is considerable. The number of ribs and spiral cords may vary, and the color is extremely variable, white to yellow and orange to brown, unicolor or with narrow or broad yellow, brown, dark brown, or grey bands on all whorls or only on the body whorl.

Reticunassa visayaensis sp. nov. has a broader, less pointed protoconch than R. paupera ( Gould, 1850) . R. visayaensis sp. nov. also differs from R. paupera by its larger size, its more bulbous shape and its lower ribs, especially on the body whorl, and by usually displaying dark bands.

R. visayaensis sp. nov. is very similar to R. tringa . When the protoconch is missing, a positive identification is almost impossible. The protoconch of R. tringa is paucispiral with 1.5–1.75 whorls, whereas R. visayaensis sp. nov. has a protoconch of 2.25–2.5 whorls. The protoconch of R. tringa is nipple-shaped, hence the name “ mamillata ” ( Preston 1907); the protoconch of R. visayaensis sp. nov. is dome-shaped. Preston’s description is accompanied by a drawing of the paucispiral protoconch.

R. visayaensis sp. nov. is the Reticunassa species most commonly offered in the shell trade from the central Philippines, as well as R. crenulicostata ( Shuto, 1969) . The latter is smaller (5–7 mm) and has a large multispiral protoconch of 3.5 whorls ( Cernohorsky 1984: pl. 38, figs 1–2; Martin 2008: pl. 354, figs 4–5). These features are the most distinguishing differences between R. crenulicostata and R. visayaensis sp. nov. Reticunassa tringa has a paucispiral protoconch. Identification based on geographical distribution alone ( Fig. 6 ) may be possible in specimens lacking a protoconch or welldefined teleoconch sculpture.

Habitat

Intertidal to 150 m, commonly from 0 to 20 m.

Distribution

Philippines, Indonesia and New Guinea ( Fig. 6 ).

Figures

Fig. 3. Shells of Reticunassa Iredale, 1936. – A–C. Possible neotype of R. paupera (Gould, 1850), MNHN IM-2007-31782, length 6.9 mm, width 3.6 mm, Vanuatu, Aore I., 15°36.6′ S, 167°10.1′ E, 10–18 m. – D–I. R. tringa (Souverbie, 1864). D–E. Hologenophore, MNHN IM-2007-31753, length 9.5 mm, width 4.6 mm. F–H. Lectotype, MHNBx 2004.TY.89.1, length 9.0 mm, width 5.0 mm. I. Protoconch of the hologenophore. – J–M. R. visayaensis sp. nov. J–L. Holotype, MNHN IM- 2007-31912, length 9.5 mm, width 4.6 mm, Philippines, Panglao I., 9°35.7′ N, 123°44.7′ E, 0–3 m. M. Protoconch. – N–Q. R. poppeorum sp. nov. N–P. Holotype, MNHN IM-2007-31779, length 9.0 mm, width 4.5 mm, Vanuatu, Aore I., 15°34.4′ S, 167°12.6′ E, 2–3 m. Q. Protoconch. Scale bars: I, M, Q = 200 µm.

Fig. 6. Geographical and bathymetrical distribution of Reticunassa visayaensis sp. nov. Star indicates type locality. Each bar represents all lv or dd specimens.