. Bulletin of the British Museum (Natural History). 47a. Figs 44 48 Dyra gracilis Conrad. Pebasian. 44-47, Pichana, Peru; Hauxwell Colin. 44, GG19797; a, front view, x 40; b, front view, early whorls only, x 100. 45, GG21522; front view, x 15. 46, GG19796; small specimen (h = mm) resembling lectotype, x 40. 47, GG21521; a, side view, x 15; b, penultimate whorl showing reverse sigmoid growth lines, x 50. 48, GG21520; side view, x 15. Puerto Narino, Colombia; Weeda Colin. Dimknsions. In mm. h bi hap h/br sa Lectotype, NYSM 9192a, Pichana 15° Paralectotype, NYSM 919
. Bulletin of the British Museum (Natural History). 47a. Figs 44 48 Dyra gracilis Conrad. Pebasian. 44-47, Pichana, Peru; Hauxwell Colin. 44, GG19797; a, front view, x 40; b, front view, early whorls only, x 100. 45, GG21522; front view, x 15. 46, GG19796; small specimen (h = mm) resembling lectotype, x 40. 47, GG21521; a, side view, x 15; b, penultimate whorl showing reverse sigmoid growth lines, x 50. 48, GG21520; side view, x 15. Puerto Narino, Colombia; Weeda Colin. Dimknsions. In mm. h bi hap h/br sa Lectotype, NYSM 9192a, Pichana 15° Paralectotype, NYSM 9192b, 4 9 15° Pichana GG19796, Pichana 17" PIMUZ 833, Iquitos (fig'd de Greve 1938: pi. 1, figs 29, 30, as H. lintea) Lectotype, GG22416, of Melania + 18 bicarinata Etheridge, Canama Holotype, GG22421, of Melania 18° tricarinata Etheridge, Canama Note. Nearly all BMPD specimens are too fragmentary to measure. Remarks. This is a very rare species represented at Pichana mainly by broken fragments. Parts of the synonymy must be treated with suspicion because Conrad's original illustrations are so small as to be useless by themselves. However, coupled with his description, which includes the statement that there are four carinae on the penultimate whorl and five ( including the basal) on the last, it is reasonable to assume that NYSM 9192 is the type series. Boettger's (1878) reference seems convincing. Roxo (1924: 48), who was quoted in de Greve's (1938) synonymy, was, in fact, remarking that he had not found the species at Tres Unidos. All specimens in BMPD of Dyris lintea (Conrad) are spirally multistriate. De Greve, however (1938: pi. 1, figs 10- 30), figured a series of shells exhibiting considerable variation in spiral sculpture as that species. PIMUZ 833 (1938: pi. 1, figs 29, 30) is here referred to D. gracilis because of its few spiral ribs, even though they are comparatively weak, and in spite of its
Size: 1238px × 2019px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
