File:American malacological bulletin (1988) (18156276885).jpg

Title: American malacological bulletin
Identifier: americanmal6719881990amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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100 AMER. MALAC. BULL. 6(1) (1988)
Text Appearing After Image:
92 Figs. 91, 92. Acanthochitona roseojugum Lyons, sp. nov., tegmental pustules (field widths = 385 ^m). Fig. 91. Bahamas; same specimen as 85. Fig. 92. Florida; same specimen as 86. of A. roseojugum and sometimes occur on the jugum of all intermediate valves (ii-vii); sutural laminae and undersides of all valves are pink. I have seen two entirely rose-colored specimens of A. andersoni, but those specimens were distinguishable by their highly arched, more narrow in- termediate valves. Some specimens of A. pygmaea from the Bahamas and Puerto Rico are flushed with pale pink on some intermediate valves, but these are immediately separated from A. roseojugum by strongly incised grooves on the jugum, wider tegmentum on intermediate valves, smaller sutural laminae, and many green spicules rather than few white spicules in the anterior and sutural tufts. Any resemblance of Acanthochitona roseojugum to A. andersoni and A. pygmaea is disspelled by inspection of disar- ticulated valves. The proportionately large insertion plate and small tegmentum of valve i, flared sutural laminae and ex- tended, strongly demarked, smooth jugum of valves ii-viii, and small slits of valve viii all resemble features of species in the A. hemphilli complex. However, the straight posterior margin of valve i and the girdle species of A. roseojugum differ con- siderably from those of species in the A. hemphilli complex. The additional asymmetrical slits on insertion plates of valves i and viii of the illustrated Bahamian specimen (Figs. 85, 89) represent anomalies that occur occasionally in many species of Acanthochitona. ETYMOLOGY: From Latin "roseus", rose-colored, and "iugum", a ridge (i.e. jugum). Acanthochitona balesae Abbott, 1954 Figs. 93-104 Acanthochitona balesae Pilsbry, 1940: pi. 12, fig. 5 (nomen nudum). Abbott, 1954: 318; 1974: 406. Watters, 1981: 175, 176, pi. 3, figs. a-c. Acanthochitona elongata Kaas, 1972: 51-53, figs. 90-94, pi. 2, fig. 3. Ferreira, 1985: 212. Acanthochitona interfissa Kaas, 1972: 53-55, figs. 95-107. Choneplax lata, Ferreira, 1985: 208-213 (pars) (non Choneplax lata (Guilding, 1829)). TYPE MATERIAL: HOLOTYPE: A. balesae: ANSP 349331 (not ex- amined). A. interfissa: 5.5 mm; Monos, Avalon Bay, Trinidad; 10 Jan 1955; RMNH 9092. PARATYPES: A. interfissa: TRINIDAD: 1 spec, 70 mm; collected with holotype; RMNH 9093. ARUBA: 5 disar- ticulated intermediate valves; Malmok, Arasji; 14 Aug 1955; RMNH 4502. —1 spec, 8.8 mm; same locality and date; RMNH 9094. OTHER MATERIAL EXAMINED: FLORIDA: 2 spec, 6.7, 9.6 mm, north side Vaca Key, 0-1 m, 1 Oct 1979, FSBC I 32558. —1 spec, curled, same locality, 4 Aug 1980, FSBC I 32571. —1 spec, 9.2 mm, Bonefish Key, CAS 063327. —1 spec, 9.3 mm, Peanut Id., Palm Beach Inlet, 0-1 m, 17 Aug 1982, FSBC I 30761. —2 spec, 4.4, 6.8 mm, 3 km south of St. Lucie Inlet, 2-3 m, 18 May 1978, IRCZM 61:008. —1 spec, 3.7 mm, same location and date, IRCZM 61:007. BAHAMAS: 1 spec, 8.4 mm, Eight Mile Rock, Grand Bahama, 0.5-1.0 m, 21-23 May 1981, FSBC I 32559. —2 spec, 9.5, 10.6 mm, Bartlett Hill, Eight Mile Rock, 0-0.5 m, 29 Aug 1984, FSBC I 32040. JAMAICA: 1 in- termediate valve, Drunkeman's Key, RMNH. ST. EUSTATIUS; 8 spec, 2.4-4.4 mm, Tumble Down Dick Bay, RMNH. TRINIDAD: See type material. VENEZUELA: 1 spec, 7.8 mm, Tortuga Id., CAS 063326. ARUBA: 3 spec, 2.5-8.3 mm, Malmok, 14 Aug 1955, RMNH. —1 spec, 7.0 mm, Seroe Colorado, 2 May 1955, RMNH. —1 spec, 5.1 mm, Rincon, 7 May 1955, RMNH. See also type material. PANAMA: 9 spec, 2.0-4.0 mm, Galeta Id., Canal Zone, Bullock collection. —10 spec, 3.0-5.0 mm, Galeta Id., Bullock collection. —10 spec, 3.0-7.0 mm, Galeta Id., Bullock collection. TYPE LOCALITY: Bonefish Key (= Fat Deer Key, between Vaca Key and Crawl Key, Monroe County, Florida; see Kaas, 1972) (original designation). DISTRIBUTION: South Florida and Grand Bahama Island to Caribbean coast of Panama and Trinidad. DESCRIPTION: Largest specimen 10.6 mm long, 3.7 mm wide including girdle; valves occupying about 33% total specimen width (Figs. 93, 94). Exposed valves white, usually with beige, olive, or brown maculations, occasionally some valves entirely brown-black; intermediate valves noticeably longer than wide.

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