FİRST RECORD OF Caligus diaphanus NORDMANN, 1832 FROM TURKİSH MARİNE HABİTATS*

Caligus diaphanus Nordmann,1832 (Copepoda; Caligidae) was reported for the first time from the gill chambers and inner faces of opercula of Chelidonichthys lucerna (Triglidae) from Aegean Sea Coasts in Turkey. Some morphological characters of this parasitic copepod are given using photograph and drawings.


INTRODUCTİON
Sea lice (Caligidae) is the largest group of parasitic copepods of fish, comprising more than 450 species (HO and LIN, 2005).
According to BİLECENOĞLU et al., (2014), eight species of searobins are known in the Family Triglidae in Turkey.
This study aims to report geographic distribution and first record of the female of Caligus diaphanus with some morphological characters from Turkey.

MATERİAL AND METHODS
18 of tub gurnard, Chelidonichthys lucerna (Linnaeus, 1758) (Pisces, Triglidae) were collected by local gears from Edremit Bay (39°33'40.74"N,26°44'47.55"E,Aegean Sea Coasts of Turkey, Figure 1) in 2014.The parasitic copepods were preserved in 70% ethanol.They were later cleared in 85% lactic acid for 1 to 2 h before dissection.Dissected parts were mounted on slides in glycerin-gelatine mounting medium.Sides of coverslip were coated with colourless nail polish.The drawings of appendages were carried out with the aid of a camera lucida (Olympus U-DA).The photos were taken using a Canon EOS 1100D camera connected to a microscope.Measurements were taken in millimetres (mm), with a micrometrical programme (Pro-way).Scientific names, synonyms of the parasite and the host were checked through WORMS (2015).The identification, scientific names, their synonyms of parasite were checked with BRIAN (1935), KABATA (1979), CRESSEY andCRESSEY (1980)  First leg (Fig. 2 N o 11) basipod with a shorter plumose seta near outer and inner mid-margin; exopod first segment with a short spine on outer distal corner and a row of spinules along inner margin, second segment with 4 outer to terminal spines and 3 inner plumose setae.Second leg (Fig. 2 N o 12) basipod with a short plumose seta on outer distal corner; exopod first and second segments each with a stout spine on outer distal corner and an inner seta, last segment with 3 outer spines and 5 terminal to inner setae; endopod first segment with an inner seta, second segment with a patch of long spinules along outer edge and 2 inner setae, last segment with a patch of long spinules on outer edge and 6 setae.Third leg (Fig. 2 N o 13) exopod first segment with a prominent spine on outer distal corner, second segment with a short spine on outer distal corner and inner seta, last segment with 3 short outer spines and 4 terminal to inner setae; endopod first segment with an inner seta, last segment with 6 terminal setae.Fourth leg (Fig. 2 N o 14) basipod with a small seta on outer distal corner; exopod first segment with a fringed seta on outer distal corner, second segment with fringed seta on outer distal corner, last segment with 3 fringed setae.Fifth leg (Fig. 2 N o 15) represented by 3 short plumose setae.
However, some discrepancies are found in the fine details of the structure of the appendages.For instance, we found proximal segment of antennule with 11 setae, distal segment bearing 11 setae while proximal segment with 27 setae, distal segment bearing 14 setae by CRESSEY and CRESSEY (1980); proximal segment with 10 setae, distal segment bearing 8 setae by BRIAN (1935); proximal segment with 24 setae, distal segment bearing 11 setae by CUBILLA (1985).
Morphologic features of all dissected parasites permitted identification of this copepod as Caligus diaphanus, Nordmann (1832).This study is so important that it is the first record from Turkey marine habitats according to literature BAKIR et al., (2014).