Step-spot pygmygoby (Trimma xanthochrum), first described by Winterbottom, 2011 is a tiny fish in the family Gobiidae (order Gobiiformes). Adults typically reach 2.50 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 12 to 70 metres. It occurs in Tropical waters. On the IUCN Red List, it is classified as Data Deficient.The species is kept in the aquarium hobby. Care requirements and behaviour align broadly with other Gobiidae kept in the hobby.
Dorsal spines (total): 7; Dorsal soft rays (total): 7 - 8; Anal spines: 1; Anal soft rays: 8. This species is characterized by the following: a wide interorbital region (80-100% pupil diameter); the second dorsal spine usually reaching posteriorly to between the bases of the second to third dorsal fin rays; pectoral rays 15-16, usually with 7-8 branched rays; vertical rows of sensory papillae below eye of 2-3 papillae in rows 1-4 and 4-5 in row 5; caudal blotch which has a lower half about two-thirds the width of the upper half; usually an overall yellowish body with yellow at least proximally in the caudal fin .: fusiform / normal; Cross section: circular.
Behavioural data for Step-spot pygmygoby is currently being reviewed.
Marine; demersal; depth range 12 - 70 m . Tropical Pacific Ocean: Indonesia.
The following diseases are known to affect Step-spot pygmygoby.
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