. Bulletin of the British Museum (Natural History) Zoologie. Océan Indien ÉCHINODERMES RECUEILLIES AU COURS DE LA VOYAGE SINDBAD (1980-1981) 69. Fig. 7 P. sohariae, séché (PMBC, 3048 r/r = 50/15 mm). crème. Cet exemple diffère de la spécimens Sindbad dans sa plus grande taille, de l'absence de plaques convexes sur le disque et granulation uniforme des plaques. Toutefois, compte tenu de la variabilité des cinq spécimens du Sri Lanka les différences sont compensés par les similitudes et nous considérons que cette Paraferdina sohariae spécimen représente également. Un petit spécimen de Ceylan (Sri Lanka), avec R de 13,5 mm
1877 x 1331 px | 31,8 x 22,5 cm | 12,5 x 8,9 inches | 150dpi
Informations supplémentaires:
Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.
Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.
. Bulletin of the British Museum (Natural History) Zoology. INDIAN OCEAN ECHINODERMS COLLECTED DURING THE SINDBAD VOYAGE (1980-81) 69. Fig. 7 P. sohariae, dried (PMBC 3048, R/r = 50/15 mm). cream. This example differs from the Sindbad specimens in its larger size, lack of convex plates on the disc and uniform granulation of the plates. However, in view of the variability shown by the five specimens from Sri Lanka the differences are outweighed by the similarities and we consider that this specimen also represents Paraferdina sohariae. A small specimen from Ceylon (Sri Lanka), with R of 13.5 mm, referred to as a juvenile Ferdina offreti by Koehler (1910) and believed to represent Fromia nodosa by A. M. Clark (1967) cannot be placed in Fromia because of the adambulacral armature. Koehler included it in Ferdina as it had a single row of spines on the adambulacral plates but noted that the marginal plates were granule covered, unlike those of the holotype. This specimen is now referred to Paraferdina and clearly represents P. sohariae. Range of variation. The size (R) ranges from 36 to 50 mm with an R/r ratio of 3.3 to 4.3/1 (mean 3.7/1). They have five to seven plates across the base of the rays between the superomarginals, however there is considerable variation in the relative numbers of convex and flat plates. There are 14 superomarginals in the Thai specimen, 12-13 in three specimens, 10-11 in one and those of the remaining specimen are too irregular to count. Inferomarginals number 15-16 in three specimens. 13-15 in another. The abactinal plates are coarsely granulated with 9-10 granules/linear mm, while the marginals have 12/mm except near the arm ends where abactinal, terminal and marginal plates have very coarse granulation (6-7/mm). Actinal plates have 10-12 granules/ mm in the holotype, 9-10/mm in one of the paratypes. Three of the paratypes have slightly coarser granulation than the holotype while one has a much coarser granule cover. The Thai specimen has a
