Description a Sea Cucumber Species Holothuria atra Jaeger, 1833 from Kish Island Iran (Echinodermata: Holothuroidea) (original) (raw)
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Holothuroids, or sea cucumbers are an abundant divers group of Echinoderms with over 1400 species. They valued so much and play an important role in the ecosystem, they prevent anoxic condition in the sediment by removing organic matter. In this study, we report a sea cucumber from Kish island. Examination of gross morphology and microscopic ossicles showed that this species is Stichopus hermanni. This is brownish yellow often mottled and with darker papillae giving a spotted appearance. This species inhabits shallow water common in reef habitats. It is widely distributed across the tropical Indo-Pacific region. Stichopus Hermannii, is a holothurians of order Aspidochirotes belonging to the family Stichopodidae. It is deposit-feeder and is mainly found on sandy bottom of fringing reefs surrounding the Kish island.
Reproductive biology of the sea cucumber Holothuria sanctori (Echinodermata: Holothuroidea)
Scientia Marina, 2011
The reproductive biology of the sea cucumber Holothuria sanctori was studied over 24 months (February 2009 to January 2011) at Gran Canaria through the gonad index and a combination of macro-and microscopic analysis of the gonads. Holothuria sanctori showed a 1:1 sex ratio and a seasonal reproductive cycle with a summer spawning: the mean gonad index showed a maximum (3.99±0.02) in summer (June-July) and a minimum (0.05±0.04) between late autumn (November) and early spring (March). Females had significantly wider gonad tubules than males. First maturity occurred at a size of 201 to 210 mm, a gutted body weight of 101 to 110 g and a total weight of 176 to 200 g. Holothuria sanctori shows a typical temperate species reproduction pattern. These results could be useful for managing current extractions of H. sanctori in the Mediterranean and in case a specific fishery is started in the eastern Atlantic region.
The sea cucumbers (Echinodermata: Holothuroidea) of Tubbataha Reefs Natural Park, Philippines
Sea cucumbers are among the large macrobenthic reef invertebrates that have received little attention in Tubbataha Reefs Natural Park, Philippines. To assess the status of sea cucumbers in the park, distance and opportunistic sampling were conducted between December 2009 and April 2010. In total, 18 sea cucumber species were recorded, 12 of which were new records and three are IUCN listed. Stichopus chloronotus had the highest density, Holothuria atra ranked second, followed by Bohadschia argus and Thelenota ananas. The mean density of all species at the North Atoll was much higher than it was at the South Atoll. Jessie Beazley Reef had the lowest density and species richness. Sizes were relatively big and some species were at their maximum lengths. The present findings suggest the absence of exploitation at the park but efforts to prevent any form of extraction are needed for the continuous recovery of sea cucumber populations and for the park to serve as a significant seed source for depleted reefs. Regular population monitoring of sea cucumbers and other reef invertebrates is needed and must include those in the lagoon, which was not covered by this study.
ZooKeys
A re-description of the little-known holothurian species Holothuria (Lessonothuria) lineata Ludwig, 1875 is given. It is based on the single recovered type specimen and an individual recently collected on Glorioso Islands, near Madagascar. A key to separate three closely related and commonly confused species, i.e., Holothuria (Lessonothuria) pardalis Selenka, 1867, Holothuria (Lessenothuria) verrucosa Selenka, 1867 and Holothuria (Lessonothuria) insignis Ludwig, 1875, is presented.
Zootaxa, 2017
Some materials in the Natural History Museum, London, originating from various parts of the world, proved on examination, to comprise two new species herein described as Cladodactyla pesdispersa n. sp. and Thyonina rasidae n. sp., and a new subspecies, Havelockia ferali andamanensis n. subsp. In addition, some specimens examined from the museum collections of the Department of Aquatic Biology and Fisheries, University of Kerala in India contained, besides the well-known dendrochirotids, Aslia forbesi (Bell) and Stolus buccalis (Stimpson), two specimens which proved to also represent a new species of Thyonina, herein described as Thyonina bijui n. sp., as it differs significantly from T. rasidae n. sp. from Pakistan and the South African T. articulata Vaney. For the genus Thyonina, currently attributed to the subfamily Thyoninae, a new subfamily Thyonininae is here diagnosed. In addition a new subfamily Hemithyoninae is proposed for Hemithyone semperi (Bell), also placed in the Thyon...