The suckers were small, widely separated, and in a single row. The arm formula was I > II > III > IV (Fig. Arms I-III were sub-equal in length and about as long as the mantle, while the arm pair IV was shorter. The funnel was of moderate length, reached posterior margin the eye, and was not fused with head. Optic lobes of brain broadly spaced (~2 mm) with elongated optic nerve stalks (Fig. The eyes were small, rectangular, with laterally directed lens (Fig. The head was small, narrow, fused with mantle, and had no clear division from the arms (Fig. The mantle - elongate, oval in cross-section and rounded at the posterior end. External morphological features of this paralarvae agree well with Thore ( 1949) and Norman and Finn ( 2014). The specimen was identified based on Thore ( 1949) and Norman and Finn ( 2014). The specimen was in good condition, although one eye was separated from the head. The hydrographical data from the station are shown on Table 1. The maximum depth at the location was 2005 m. 2) was collected from a depth of 150 m near the Laccadive archipelago (Kalpeni Island, 09° 52′ 30″ N 73° 37′ 22″ E), in the Arabian Sea. On the 28 February 2015 at 1900 h, a single paralarvae of V. richardi is housed in the collection of cephalopod in the Marine Biodiversity Museum of Central Marine Fisheries Research Institute (CMFRI), in Kerala, India (Accession number DE.03.01.02.07). All measurement were done according Roper and Voss ( 1983) within 0.1 mm. Photographs and measurements were taken with a Nikon stereozoom microscope (SMZ-25). Sorting and identification were performed in the laboratory. Samples were preserved in 5 % neutral buffered formalin. The DSL was detected with an Echosounder Garmin-4210. Oceanographic parameters (sea surface temperature (SST), salinity and pH) were measured with a YSI Multiparameter sonde (Model 650 MDS).
![glass octopus glass octopus](https://i5.walmartimages.com/asr/f4774f8b-775b-437e-ad03-b35d6c5caeb2_2.fdc1e32ee968f24a4c880eb26ae781b3.jpeg)
Zooplankton samples were collected at two stations during the research cruise of the F.V.Silver Pompano in February 2015, The Isaacs-Kidd midwater trawl (Model: − IK-02.5 M-A1-00, Open Sea Instrumentation, Canada) was towed horizontally for 30 min at 150 m depth across Deep Scattering Layer (DSL) area.
![glass octopus glass octopus](https://i.pinimg.com/originals/27/4a/d0/274ad051b80e2912479a10b00900c53f.png)
The present report provides information on the first record of the species in the Arabian Sea. 2014) the species was never recorded there, and the nearest known record was south of Sri Lanka (78° 30″ E 04° 20″ N, Fig. 1993 Chesalin and Zuyev 2002 Sajikumar et al. In spite of more than 4000 planktonic hauls carried out in Arabian Sea and waters of India (Silas 1968 Aravindakshan and Sakthivel 1973 Piatkowski and Welsch 1991 Piatkowski et al. The records of specimens identified as Vitriledonella are extremely rare and only few exist to the date (Norman and Finn 2014), mostly obtained from stomachs of predators (Santos et al. Vitreledonella richardi is the only representative of the genus Vitreledonella and of the family Vitreledonellidae (Norman and Finn 2014).
![glass octopus glass octopus](https://www.noyougohome.com/wp-content/uploads/2018/11/IMG_7238.jpg)
It attains mantle length (ML) up to 11 cm and a total length of up to 45 cm. Vitreledonella richardi Joubin 1918, also known as the glass octopus, is an incirrate octopus inhabiting meso-bathypelagic waters of tropical and subtropical regions worldwide (Norman and Finn 2014).