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Gastropoda:Ovulidae VENUS 63 (3-4): 101-108, 2005 Description Description of a New of Species Primovula (Gastropoda: Ovulidae), with the the Designation of the Type Species for the genus Dentiovula Yoshihiro Yoshihiro Omi and Phillip W. Clover 4-20-8-4 4-20-8-4 Sendagaya, Shibuya-ku, 151-0051 おか o, Japan P.O.Box P.O.Box 339, Glen Ellen California 95442, U.S.A. Abstract: Abstract: A new ovulid species, Primovula oη za, is described from off the Kii Peninsula, the the Kurose bank near Hach 討0 てjima Island in the Izu-shichito Islands, and Tatsumi-dashi in the the Ogasawara Islands, all in Japan. It is most similar to Primovula dorsuos α（ Hinds, 1844) in morphology, morphology, but it can be distinguished by non-crenulate anterior extremity, beaked posterior extremity, extremity, and different line marking on the dorsum. In addition to this d巴scription, Dentiovula colobica colobica Azuma & Cate, 1971 is designat 巴d as the type species of the genus Dentiovula. Keywords: Keywords: Ovulidae, Primovula oη za, new sp 目 ies, Japan, type species, Dentiovula Introduction The Ovulidae are a diverse family associated with cnidarians in the warm temperate to tropical waters waters of world oceans. The family has been excessively split. Rosenberg (1992) claimed that its almost almost 400 names might be reducible to 160 to 170 valid taxa, and its 65 generic names to few 巴r than than half. Despite this, we have found an undescribed species from southwestern Japan, hereby described described as the new species Primovula oη ・za. In In the process of investigations related to this taxon, we found that taxonomic confusion surrounds surrounds with Primovula dorsuosa (Hinds, 1844). The species selected as the type species of Dentiovula Dentiovula Habe, 1961 was misidentified as Ovum dorsuosa Hinds. Therefore, in this paper, we also also discuss the type species of genus Dentiovula, propose a redefinition, and list the species which belong to the genus. Taxonomy Family Family Ovulidae Fleming, 1828 Genus Primovula Thiele, 1925 Type species: Amphiperas beckeri Sowerby, 1900, by original designation. Primovula oη za n. sp. (Fig. (Fig. 2A-J) Crenavolva Crenavolva (Cuspivolva) draperi Cate et Azuma, 1973 - Okutani, 1975: 190, pl. IX , fig. 14 [not C. draperi draperi Cate & Azuma, 1973]. Dentiovula Dentiovula m αriae (Schilder, 1941)- Fukuda, 1995: 10, pl. 51, fig. 871 [not Primovula mariae Schilder, 1941]. 1941]. Type material: Holotype (NSMT-Mo 73638) from 180 m, Tatsumi-dashi, between Chichijima Island Island and Hah 司ima Island in the Ogasawara Islands, Japan (26°50 ’N, 142°10 ’ E), September 22, 22, 1985, collected by the fishing vessel Fukusho-Maru, with a coral tangle-net; paratype #1 102 Y. Omi & P. W. Clover 132° 132° E 13 42 。N 4ト 'l> 'l> ョ9 !<._ !<._ む 'l> 'l> ザ 38 。 34 。 市 j ・む ．火、 /l ・o /l 、 勺 〈ミ『 b 30 。 Kurose Kurose bank ~~ .. .. ~ ぷ f... f... ， 》 。 'fil ‘ . 'fil g: atsumi-dashi T atsumi-dashi －一一一’~ .雪印 26 。 Fig. Fig. 1. Localities for Primovula oryza n. sp. (NSMT 1978, 1978, collected by P. Clover, together with the gorgonacean host Siphonogorgia dipsacea Wright & Studer in a gill net for lobsters; paratypes #2, 3 (NSMT-Mo 73640, 73641) dredged from a depth depth of 175m, Kurose bank near Hachijo-jima Island in the Izu-shichito Islands, Japan (33 ° 20.6 ’N, 139°36.7 ’ E), July 23, 1974, by the R八f Soyo-Maru, Tokai Regional Fisheries Research Laboratory; Laboratory; paratypes #4 and 5 (Coll. K. Yamashita: number Mk ・5) from 180 m, Tatsumi-dashi, between between Chichi サima Island and Haha-jima Island in the Ogasawara Islands, Japan (26 °50 ’ N, 142°10 ’ E), July 7, 1985, collected by Messrs Tomobe and Ogawa (Fukusho-Maru), with a coral tangle-net tangle-net (Fig. 1). Description : Shell small, rhomboid, broadest at approximately 1/3 from end, posterior where angled angled shoulder 仕ansverses dorsum, gradually attenuate toward anterior terminal. Dorsum heavily New species of Primovula 103 Fig. Fig. 2A ・J. Primovula oη za n. sp. A ・D. Holotype (NSMT Mo-73638) from Ogasawara Islands, 9.0 × 4.8 × 4.l mm. E, F. Paratype #l (NSMT-Mo 73639) from Wakayama pref1 巴cture, 8.0 ×4.0 × 3.3 mm. G, H. Paratype Paratype #4 (coll. Yamashita) from Ogasawara Islands, 9.7 × 5.2 × 4.3 mm. I, J. Paratype #2 (NS 恥1T- Mo 73640) from Kurose bank, 11. l × 5.4 x 4.4 mm. Fig. 2K, L. Primovula dorsuosa from Wakayama prefecture , 7 .0 × 3.5 x 3. l mm. Seal 巴 bar= 5 mm . 104 104 Y. Omi & P. W. Clover Fig. Fig. 3. Comparison of posterior and ant 巴rior extremities of Primovula oryza (A, C: Holotype) and P. dorsuosa dorsuosa (B , D) . and and evenly incised with approximately 100 spiral striations over all. Anterior terminal produced , arched arched and slightly oblate in front. Posterior terminal abruptly tapered, pointed beak with shallow and and straight canal. Right margin callously rimmed, where two denticles protrude posteriorly in dorsal dorsal view. Dorsal surface white in color, pigmented with faint fine yellow line along angles of of labral shoulder extending over both terminal s. Ventral side smooth and thickly calloused . Columella well developed, edentate, with step at margin of collous. Columellar striations restricted restricted to apertural side . Aperture na 汀 ow, broadened anteriorly. Long concave columellar peristome, peristome, smooth on surface, narrowly depressed in middle , gently broadened to front as a fossula. fossula. Triangular funiculum, bearing two ridges, upraised on edge, connected to inner wall of posterior posterior canal. Outer lip, wide, flat and edentate over anterior half, with six denticles in posterior portion. portion. Denticl 巴s with wide interstices , becoming longer toward posterior end with last two extending extending across labrum and protruding from outer edge. Intraspecific Intraspecific variations: Some infraspecific variations were observed among the type specimens specimens (Fig. 2A-J). The posterior ros 住um exhibits different degrees of development. Also, one of of the type specimens, lacks the dorsal marking, and bears lines forming a pattern on the dorsum. Paratype Paratype #1 apparently has two faint yellowish lines on the dorsum; one is indistinctly transverse on the posterior portion, while the other is vertical at the right side of the mid-anterior portion, and and barely visible (Fig. 4A) . Dimensions (Length × width × height in mm): Holotype, 9.0 × 4.8 × 4.1. Paratype #1 , 8.0 × 4.0 × 3 .3. p紅 atype #2, 11 .1 × 5.4 x 4.4 . Paratype #3, 10.3 × 4.9 × 4 .2. Paratype #4, 9.7 × 5.2 × 4.3 . Paratype #5, 6.7 ×3.6 ×3 .1. New species of Primovu 105 Fig. Fig. 4. Comparison of dorsal pattern of Primovula oη ・za (A) and P. dorsuosa (B). Type Type locali. 砂： Tatsmni-dashi, Ogasawara Islands, 180 m deep. Distribuh 仰： Off Minabe, Wakayama Prefecture; Kurose bank in the lzu-shichito Islands; Tatusmidashi Tatusmidashi in the Ogasawara Islands (Fig. 1). E 砂mology: From the Latin “oη za ”， meaning rice, referring to the shape and size of the shell. Discussion: Discussion: The present new species is allocated to the genus Primovula. Primovula was originally originally proposed based on the type species Amphiperas beckeri Sowerby, 1900 by Thiele (1925). Cate Cate (1973a) quoted Thiele (1925) as giving the diagnostic features of Primovula as follows: “ Shell small, pyriform; aperture na 汀 ow; outer lip distinct, thickened, d巴nticulate; funiculum distinct, distinct, fully developed ’＇. The present new species is consistent with this definition of Primovula except except for the shell outline which is not pyriform. The present new species is closely related to P. dorsuosa (Hinds), and common characters are as as follows: (1) Outline is angular rhomboid. (2) The ventral side of shell is covered with a thick callus. callus. (3) Labral denticles are spaced, protruding as several teeth. However, the present new species species is distinguished from P. dorsuosa (Hinds) by following features: (1) Lack of crenulate terminals terminals on extremities, forming beaked posterior extremity, and (2) coarser dorsal striations. Comparing the dorsal line between the new species and P. dorsuosa, both possess similar lines in in approximately the same position (Figs. 4A, 4B). This feature might be considered the evidence of of close relationship between the new species and Primovula dorsuosa (Hinds). Among similar-looking ovulids hitherto known from Japanese waters, Crenavolva rostella Cate, Cate, 1973 superficially resembles the present new species. However, C. rostella differs by having a more narrowly ovate shell with distinct transversal striations on the colum 巴lla. Primovula diaphana diaphana Liltved, 1987 from Natal, South Africa, is also similar to the present new species, but di 百ers in having a pyriform shell with distinct transversal striations on the columella, crenulations on the anterior two-thirds of labrum and na 汀 owly spaced labral denticles. 106 Y. Omi & P. W. Clover Genus Dentiovula Habe, 1961 Type Type species here designated (ICZN Art. 70.3.2): Primovula colobica Azuma & Cate, 1971 Diagnosis: Diagnosis: Shell small, sub-rhomboid to elongate oval, roundly angled at middle, with dentate posterior posterior rostrum. Dorsum inflated, incised with numerous spiral striations. Columella round 巴d, forming forming triangular funiculum near posterior canal. Labrum with heavily formed denticles on posterior posterior half. Mantle and foot with similar pattern of numerous fine orang 巴 speckles. Mantle with with polyp-like appendages. Cephalic tentacles slenderly tapered, encircled with darker orange band at central portion. Note: Note: The genus Dentiovula was also spelled Dentivolva (Habe, 1961; App.14) in the original description. description. However, Habe corrected the spelling to Dentiovula in the second printing (Habe, 1962). 1962). Moreover, Cate (1973b) pointed out the 巴町or of spelling, and as “自 rst revisor ”(ICZN Article Article 32.2.1), proposed to retain Habe ’ s original spelling, Dentiovula, as the correct and valid one, one, with Dentivolva as an o句ective synonym.
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