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Trichonotus cyclograptus (Alcock, 1890), MARC/ZSI/F3539 (SL: 108mm)
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Trichonotus cyclograptus (Alcock, 1890) is a sand diver fish species of family Trichonotidae, rediscovered from Bay of Bengal after 123 years. The present site of the collection of the specimens is more than 400 kilometers away northwardly from the type locality. Both the type locality as well as the current locality is within the Bay of Bengal alo...
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... single regular row of teeth anteriorly, followed by two irregular rows of teeth posteriorly. Dorsal fin is with four spines, 46 soft rays and anal fin is with 38 soft rays. Dorsal fin spine is non-filamentous and all rays are branched. Lateral line with 59 scales; 29 rows of scales before anus. Head and body is brown colored with 12 dark bands (Fig. 1A); fins and body with small circular spots (Fig.1B). Total numbers of vertebrae is ...
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Citations
... Trichonotus setiger is more common and the type species of Trichonotidae. There are reports on the species from the eastern Coromandel Coast and the Andaman Sea (Ray et al. 2018;Nair and Kumar 2018 Diagnosis Shape of the specimen was almost circular, deeply ovate. Both eyes on the left side of head; prominent cleft present in front of interorbital space (Fig. 3a). ...
On the northeastern flank of the Bay of Bengal, the St. Martin’s Island, a sedimentary continental formation, is the only maritime island and an Ecologically Critical Area of Bangladesh. Rock beds fringing the island from supratidal to subtidal zone with a subtidal depth around 10 m and presence of non-reef forming scleractinian corals from lower rocky intertidal to about 200–600 m offshore comprise a rich but least-explored rocky tidal habitat. Addressing the knowledge gap, during December 2017, an expedition was conducted to observe fish diversity caught in beach seines, gillnets and drifting handlines. Studying morphological and meristic characters of the collected specimens
revealed 7 bony fish species for the first time in Bangladesh and northern seaboard of the Bay of Bengal. These are Ablennes hians, Callionymus erythraeus, Ellochelon vaigiensis, Grammatobothus polyophthalmus, Istiblennius dussumieri, Omobranchus punctatus, and Trichonotus setiger. The family Trichonotidae and the genera Ablennes,
Callionymus, Grammatobothus, and Istiblennius, too, represent the first record for Bangladesh. Omobranchus punctatus, I. dussumieri, C. erythraeus and T. setiger were strongly associated with the tidal boulder beds.Grammatobothus polyophthalmus, a flounder threatened by shrimp harvesting, was caught in trawling gillnet operated in the surrounding subtidal waters. Ellochelon vaigiensis, a catadromous mullet known to spend natal stages near shoreline, was collected from a rock-pool. Fish diversity of the St. Martin’s Island is not well understood; the last comprehensive checklist dated back to 1997. Thus, these results remarkably obtained from a cursory expedition entail a thorough diversity assessment of the island.
... Trichonotus cyclograptus (Alcock, 1890) was originally described from Bay of Bengal, Ganjam District, Odisha. Ray et al. (2018) recently reported this species from the West Bengal coast. The present specimen was identified from the unidentified collections of the Marine Biology Regional Centre, Chennai -collected from the Kashimedu fish landing centre along the Chennai coast-which brings the report of this species for the first time from Southern part of the East coast. ...
... Meristic counts and morphometric measurements of the Trichonotus species were taken following Alcock (1890) (2018) and were presented in Table 1. The identification of the species was done following Ray et al., (2018) and Katayama et al., (2012 ...
... Trichonotus cyclograptus is like T. arabicus, however differs from T. arabicus by having 12 body bands (14 bands in T. arabicus) and 28 rows of pre-anal scales (In T. arabicus there are only 20-22 rows of pre-anal scales). The type specimens were reported only from the sandy bottom of Ganjam district of Odisha at a depth of 18-23 m. Ray et al. (2018) also reported this species from the sandy bottom of Bay of Bengal of East Medinipur district, West Bengal. The report of this species from Tamil Nadu coast suggests the availability of this rare species along the coast of Bay of Bengal, India. ...
This paper brings the first distributional record of a sand diver fish of the family Trichonotidae: Trichonotus cyclograptus
(Alcock, 1890) from the southern part of East Coast, India. The specimen reported was collected from the fish landing
site at Kasimedu, Chennai, Tamil Nadu. Until now, only one species of the family Trichonotidae i.e., Trichonotus setiger
Bloch & Schneider, 1801 has been reported from southern part of east coast, and the present report adds the tally to two
species under this family for this region. Though Trichonotus cyclograptus (Alcock, 1890) was originally described from
Odisha coast, only recently this species has been reported from the coast of West Bengal. The present report confirms the
distribution of this species along the Indian coast of Bay of Bengal, and the probable case of endemism to this region due
to the absence of reports from elsewhere since its original description.
An updated systematic inventory of the fish faunal variety from the state of West Bengal,
comprising 894 species represented by 36 orders and 152 families, has been produced following
an extensive review of the literature. Diversity-wise, order Acanthuriformes, has 19 families and 120
species, is the top order of both freshwater and marine fishes. Cypriniformes, which has 7 families
and 117 species, is the second most diverse order and the most diverse order in freshwater.
Cyprinidae, makes up 6% of the entire fish population in West Bengal, is the family with the most
diversity. Marine fishes showed the highest diversity in Gobiidae and Carangidae with 5.6% and
4.8% respectively. 221 species are fully freshwater species, whereas 297 species are marine. The
rest of the species are associated with fresh water, brackish and marine habitats. According to the
IUCN red list status, 8 species belong to the critically endangered category, 18 belong to the
endangered category, 30 species belong to the vulnerable category and 37 species belong to the
near threatened category. The conservation status of 239 fish species found in West Bengal has
not yet been determined by IUCN. The present study is the first attempt to provide a comprehensive data of fish faunal diversity occurring from all the habitats present in West Bengal,
which will ultimately help in the management of the prospects of fisheries resources from West
Bengal as well as provide support for the effective conservational planning process.
