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Trimma abyssum is also known as the deepreef pygmy goby. Found in the gobiidae family of fish.

Trimma abyssum is commonly found in the eastern Indian ocean and most likely to span the entire East Indian region.

Maturity: unknown length range: ? - 3.2cm ( 1.25in )

Dorsal spines total: 7 Dorsal soft rays total: 8 Anal spines: 1 Anal soft rays: 8

Description This species of goby is distinguished by this set of characters D VI + I,7- 8 the second and third spines are the longest out of all of the spines on Trimma abyssum

Short filamentous tips reaching to between bases of first two segmented rays of second dorsal fin when adpressed; A I,8; pectoral rays 16, all are unbranched; pelvic fin I,5 with the fifth pelvic ray unbranched, 48-55% length of fourth pelvic ray; bony interorbital 53-65% pupil diameter; nape fully scaled with 12-13 scales on midline of predorsal; cheek and opercle covered with scales; scales ctenoid on breast (prepelvic); a prominent dark bar at caudal-fin base and scale pockets are strongly outlined with melanophores

Citation Allen, G. r. (n.d.). Trimma Abyssum summary page. FishBase. Retrieved April 16, 2022, from https://www.fishbase.se/Summary/SpeciesSummary.php?ID=68673&amp;AT=Abyssal%2Bpygmygoby Picture and original report