Reticunassa poppeorum, 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 : 24-28

Reticunassa poppeorum sp. nov.

urn:lsid:zoobank.org:act:21521D97-7E7D-4627-A806-43AF0E2AE7EA

Fig. 3 N–Q, 7; Tables 1–2

Etymology

The name is given to honor Guido T. and Philippe Poppe for their many valuable contributions to the knowledge of and myriad publications on molluscs, including four volumes on Philippine marine molluscs and the magazine “Visaya.”

Type material

Holotype

VANUATU: SANTO 2006, stn FB61, Aore Island , Port Benier, 15°34.4′ S, 167°12.6′ E, 2–3 m, in fine coral sand ( MNHN IM-2007-31779 , lv, length 9.0 mm, width 4.5 mm).

Paratypes

VANUATU: SANTO 2006, stn DR03, Segond Channel, 15°31.0′ S, 167°15.8′ E, 2–30 m, reef slope, fine rubble with Halimeda ( MNHN IM-2007-32742, 1 lv); Éfate, snorkeling, 2–3 m, leg. T. McCleery, 2002 ( HD 35802, 1 spm); Tutuba I., 15°32.3′ S, 167°16.9′ E, 13 m ( HK 137.23, 1 spm).

PHILIPPINES: PANGLAO 2004, stn S2, Bohol I., Baclayon, 9°37.4′ N, 123°54.5′ E, 4–5 m ( MNHN IM-2007-31938, MNHN IM-2007-31937, 2 lv; HK 137.21, 2 spm); stn S15, Cortes Takot, 9°41.3′ N, 123°49.5′ E, 4–6 m ( MNHN IM-2000-22721, 1 lv; HK 137.01, 3 spm; HD 24148, 2 spm).

Other material examined

MALAYSIA: Sarawak, South China Sea, Muri I., off NW coast, 01°54′13″ N, 108°38′49.4″ E, 10–30 m, leg. H. Morrison ( GH, 1 spm); Sarawak, Miri, outer reef off Tanjung Lobang ( JGMR, 1 spm); Sabah, Kota Kinabalu, Tanjung Aru ( JGMR, 1 spm).

PHILIPPINES: PANGLAO 2004, stn S2, Bohol I., Baclayon, 9°37.4′ N, 123°54.5′ E, 4–5 m (41 spm); stn S15, Bohol I., Cortes Takot, 9°41.3′ N, 123°49.5′ E, 4–6 m (15 spm; ZMA.Moll.4.09.449, 1 spm); stn S1, Panglao I., Biking, 9°35.6′ N, 123°50.5′ E, 5m (2 spm); stn B5, Panglao I., Biking, 9°35.2′ N, 123°50.4′ E, 4 m (2 spm); stn B8, Panglao I., Napaling, 9°37.1′ N, 123°46.1′ E, 3 m (3 spm); stn S5, Panglao I., Napaling, 9°37.1′ N, 123°46.1′ E, 2–4 m (10 spm); stn S7, Panglao I., Sungcolan Bay, 9°38.5′ N, 123°49.9′ E, 1–4 m (2 spm); stn S17, Panglao I., San Isidro, 9°34.6′ N, 123°49.9′ E, 6 m (1 spm); stn S24, Panglao I., Momo Beach, 9°36.1′ N, 123°45.0′ E, 2–4 m (1 spm); stn S32, Panglao I., Looc, 9°35.8′ N, 123°44.6′ E, 2–3 m (12 spm); Pamilacan I., stn B11, 9°29.4′ N, 123°56.0′ E, 2–4 m (1 spm); Pamilacan I., stn B24, 929.4′ N, 123°56.0′ E, 38 m (2 spm); Pamilacan I., stn S10, 9°29.4′ N, 123°56.0′ E, 6–14 m (2 spm); Pamilacan I., stn S14, 9°29.3′ N, 123°55.1′ E, 5–12m (1 spm). – Cebu, leg. R. Martin ( ZMA.Moll.175495, 2 spm); Cebu, by lumen lumen, 50–150 m ( HK 137.19, 2 spm); Panglao I. area ( HD 14809, 15 spm; HK 137.14, 1 spm); Siquijor I., tangle nets, 100 m ( HD 17294, 1 spm); Balicasag I. ( MUZEE, 2 spm); Mactan I., 10–30 m, 2012 ( HD 28994, 7 spm); Mactan I., 20 m, 2014 ( HD 35816, 1 spm); Olango I., 2014 ( HD 35873, 1 spm); Camotes I., Santiago, 15 m, 2007 ( HD 21366, 1 spm); Palawan I., 10–15 m, 2009 ( HD 33880, 2 spm).

INDONESIA: Kalimantan, Berau Is, 02°12′16.3″ N, 118°35′18.9″ E, 10–25 m ( ZMA.Moll.175383, 1 spm); RUMPHIUS 1990, Ambon, stn 39 Hitu, W coast, S side of Larike ( RMNH, 1 spm); Nusa Tenggara, Alor Strait, SE bay of Pantar I., 9–25 m, leg. H. Morrison ( GH, 1 spm); Banda Sea, Wakatobi Group, E side of Moromaho I., 06°08′59″ S, 124°35′11″ E, leg. H. Morrison ( GH, 6 spm); Flores Sea, S of Buton, 7–40 m, leg. H. Morrison ( HK 137.08, 2 spm); N coast of Nusa Penida, leg. H. Morrison ( GH, 1 spm); NW side of Sulawesi, Makassar Strait, Tambu Bay, sand and rubble slope, 10–40 m, among gorgonian corals, 00°01′07″ S, 119°43′77″ E ( GH, 6 spm); Karang Kapota Atoll, SE of Buton I., 5°27′73″ S, 123°24′10″ E, on ledges of wall, 10–40 m, leg. H. Morrison ( GH, 1 spm); Berau I., W side of Maratua I., 02°12′16.3″ N, 118°35′18.9″ E, 10–25 m ( ZMA.Moll.175383, 1 spm); near Kalimantan, Pejantan I., 0°30′48.8″ N, 107°13′24″ E, 10–20 m, leg. H. Morrison ( GH, 1 spm); sand, near wreck of Japanese fighter, 0°45′16″ N, 105°36′11″ E, 45 m, leg. H. Morrison ( GH, 2 spm); near wreck, Acasta Rock, 01°39′12″ N, 106°18′26″ E, 9–50 m ( GH, 1 spm); sand, near wreck, 0°45′15″ N, 105°36′11″ E, leg. H. Morrison ( GH, 2 spm); Badas I. Group, 0°33′8.9″ N, 106°58′47.4″ E, 8–30 m, leg. H. Morrison ( GH, 1 spm); 01°38′7″ N, 106°21′23″ E, on reef, 10–25 m, leg. H. Morrison ( GH, 1 spm); Sebangmawang I., S of Bunguran I., 03°33.92′ N, 108°02.08′ E, 10–15 m, leg. H. Morrison ( GH, 4 spm); Sumatra, Kelulekabung I. ( HK 137.07, 1 spm); West Papua, Manokwari, mouth of Uriami River, leg. D. Smits ( HK 137.06, 2 spm); Bay of Hollandia, leg. Mrs H. Grootens-Boerefijn ( HK 137.11, 6 spm); off NW coast, Waigeo I., Sorong, leg. H. Morrison ( HK 137.04, 2 spm); off Sorong, Kri I., 10–15 m, leg. H. Morrison ( HK 137.05, 2 spm).

PAPUA NEW GUINEA: PAPUA NIUGINI: stn PB18, Sek I., outer slope, 05°06.3′ S, 145°49.1′ E, 26 m (1 spm); stn PB28, E of Kranket I., 05°11.9′ S, 145°49.6′ E, 10 m (2 spm); stn PB45, Sinub I., 05°07.9′ S, 145°48.9′ E, 8 m (4 spm); stn PB47, N of Kranket I., 05°11.3′ S, 145°49.6′ E, 5 m ( MNHN IM-2013-17574, 1 lv); stn PB47, N of Kranket I., 05°11.3′ S, 145°49.6′ E, 5 m (3 spm); stn PB48, N of Riwo, 05°08.7′ S, 145°48.2′ E, 2 m ( MNHN IM-2013-17567, 1 lv); stn PB51, N of Bilbil I., 05°17.7′ S, 145°46.9′ E, 5 m (3 spm); stn PD31, Alexishafen, 05°05.3′ S, 145°48.1′ E, 1–6 m (1 spm); stn PD32, N of Sek I., Ottilien Passage, 05°04.4′ S, 145°48.7′ E, 1–8 m (1 spm); stn PD36, Rempi Area, W of Barag I., 05°01.2′ S, 145°47.9′ E, 5–10 m (1 spm); stn PM19, Alexishafen, islet SE of Megas Islet, 05°05.4′ S, 145°48.6′ E, 0–1 m (1 spm); stn PM22, Sek I., 05°04.7′ S, 145°48.9′ E, 0–1 m ( MNHN IM-2013-13185, 1 lv); stn PM25, Rempi Area, Barag I., 05°01.1′ S, 145°47.9′ E (1 spm); stn PR202, S of Tab I., 05°10.3′ S, 145°50.3′ E, 2–4 m ( MNHN IM-2013-17555, IM-2013-17556, IM-2013-17557, IM-2013-17558, IM-2013-17559, IM-2013-17560, 6 lv); stn PS 04, Tab I., 05°10.0′ S, 145°50.1′ E, 12 m (1 spm); stn PS 27, Bilbil I., 05°17.9′ S, 145°46.7′ E, 14 m (1 spm); stn PS 41, S of Urembo I., outer slope, 05°15.9′ S, 145°47.1′ E, 10 m ( HK 137.20, 3 spm); stn PS 45, W Yabob I., 05°15.4′ S, 145°47.0′ E, 6 m ( MNHN IM-2013-17562, 1 lv); stn PS 47, N of Sek I., inner slope, 05°04.7′ S, 145°48.9′ E, 8 m (1 spm). – Bismarck Archipelago, New Ireland, Kavieng, Baudisson Bay, 15–35 m, leg. H. Morrison ( HK 137.03, 2 spm).

SOLOMON ISLANDS: SALOMON 2, stn DW 2234, Choiseul I., 6°51′ S, 156°24′ E, 182–277 m (1 spm); SALOMONBOA 3, stn DW 2827, N of San Cristobal, 10°26′ S, 161°51′ E, 134–272 m (2 spm).

FIJI: Suva Point, leg. S.P. Kool ( HK 137.15, 1 spm); Yasawa Group, Wayasewa I., 17°21′ S, 177°08′ E, intertidal ( HK 137.17, 1 spm).

SAMOA: Savaii I., Asau Bay ( PS, 4 spm; HK 137.10, 2 spm).

Description

Holotype

PROTOCONCH. Multispiral consisting of 2.5 whitish whorls, body whorl with rows of microscopic pustules, otherwise smooth ( Fig. 3Q ).

SHELL. Teleoconch consisting of 5.5 whorls; penultimate whorl with 15 and body whorl with 12 rounded ribs of equal size; broad varix.

SPIRAL CORDS. Body whorl with approximately 10 continuous, weak spiral cords.

INTERCORDAL SCULPTURE. Very fine, evenly spaced spiral striae, occasionally not only between, but also on spiral cords.

APERTURE. Six low denticles on outer lip, that at periphery more pronounced. Columellar callus elevated anteriorly, backside of elevation with microscopic growth lines. Callus partly extending posteriorly over body whorl onto anal canal. Columellar lip lirate onto moderately strong parietal denticle; anal canal deep.

OPERCULUM. Cream colored, serrated.

SIPHONAL CANAL. Narrow. A strong fasciole; siphonal area with several fine, one dominating, cords.

COLOR. Whitish to yellowish; some spiral cords light brown between ribs. Lower half of dorsal side of body whorl frequently with broad, orange-brown band ( Fig. 3O ).

ADULT SIZE. 6.9–12.0 mm.

Remarks

The color varies from white to yellow and orange; the spiral cords occasionally brown, sometimes only locally between the axial ribs. Some specimens have 2 brown bands on the body whorl, occasionally only visible on the varix. Some specimens, including the holotype, display a broad orange-brown band on the lower part of the body whorl. R. poppeorum sp. nov. is often recognizable by a broad, dark orange-brown band on the last half or the last third of the ultimate whorl, and is characterized by its more slender shape compared to other species in this genus.

Reticunassa poppeorum sp. nov. shows resemblance to R. tringa and R. visayaensis sp. nov. The greatest difference among the three species is the morphology of the protoconch. R. tringa has a paucispiral protoconch with 1.5–1.75 whorls, R. visayaensis sp. nov. has a multispiral protoconch of 2.25–2.5 whorls, whereas the protoconch of R. poppeorum sp. nov. has 2.5–2.75 whorls. The axial ribs of R. poppeorum sp. nov. are more pronounced and are present on the entire body whorl, whereas they decrease in height on the ventral side of the body whorl in R. tringa and R. visayaensis sp. nov.

The most noticeable difference between R. paupera on the one hand and R. tringa , R. visayaensis sp. nov. and R. poppeorum sp. nov. on the other, is the presence of lirae in the latter three species over the entire surface of the extended columella. Besides this sculptural feature, the shape of the columellar callus differentiates R. paupera from the other three species; the callus of R. paupera is practically limited to the columella, whereas the callus of the other three partly extends over the body whorl.

There are no morphological differences between R. neoproducta Kool & Dekker, 2007 and the closely related R. poppeorum sp. nov. ( Fig. 3 N–Q). However, we decided to considerer these two lineages as different species based on the reciprocal monophyly indicated by the taxonomic trees (COI and 28S separately). Furthermore, R. neoproducta is found in the western Indian Ocean and R. poppeorum occurs in the western Pacific Ocean. To date, no specimens of these two species have been found east of Sri Lanka or west of Sumatra, respectively. It seems very unlikely that these two allopatric lineages still share any gene flux.

Habitat

In sand and coral rubble, 0–40 m, mainly between 1 to 20 m. Some freshly dead specimens with operculum were collected on a hard bottom with small pockets of sediment and in coral sand at a depth of 4– 6 m. Some specimens were collected in mangrove areas and in seagrass.

Distribution

Malaysia, Indonesia, the Philippines, Fiji, and Western Samoa ( Fig. 7 ).

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