Updated 24 Feb. 2026
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Allomicrodesmus Schultz 1966 állos (ἄλλος), other, i.e., another genus presumed to be closely related to Microdesmus (Gobiidae)

Allomicrodesmus dorotheae Schultz 1966 in honor of Schultz’ wife, Dorothea Bowers Schultz, who illustrated many of the new species in his monograph (but not this one)

Gymnoxenisthmus Gill, Bogorodsky & Mal 2014 gymnós (γυμνός), bare or naked, referring to absence of scales on body; Xenisthmus, similar in body form to that genus

Gymnoxenisthmus flavicinctus Gill, Bogorodsky & Mal 2019 flavus (L.), yellow; cinctus (L.), belted or girdled, referring to yellow bars on upper body

Gymnoxenisthmus tigrellus Gill, Bogorodsky & Mal 2014 diminutive of tigris (L.), tiger, i.e., little tiger, referring to orange bars on body (name was selected by school children at the Australian Museum Science Festival Expo in August 2013)

Paraxenisthmus Gill & Hoese 1993 pará (παρά), near, referring to its similarity to Xenisthmus
Paraxenisthmus cerberusi Winterbottom & Gill 2006 of Cerberus, three-headed dog guarding the gates of Hades in Greek mythology, referring to its “relatively toothy attributes,” and to black juveniles and red-and-black adults, colors that are “often associated with the darkness and flames of the Christian concept of the Underworld”

Paraxenisthmus springeri Gill & Hoese 1993 in honor of American ichthyologist Victor G. Springer (1928–2022), U.S. National Museum, for his contributions to the systematics of xenisthmine and other fishes

Rotuma Springer 1988 named for the island of Rotuma, a Fijian dependency, type locality

Rotuma lewisi Springer 1988 in honor of Australian fisheries biologist Anthony D. Lewis (1948–2022), Fisheries Officer, Government of Fiji, for his support of Springer’s field work in Fiji

Tyson Springer 1983 named for American ichthyologist Tyson R. Roberts (1940–2025), the first to collect this species (1975) and recognize its distinctiveness

Tyson belos Springer 1983 bélos (βέλος), arrow or dart, referring to its arrow-like shape

Xenisthmus Snyder 1908 xénos (ξένος), strange or foreign (i.e., different), presumably referring to how edges of gill membranes of X. proriger (=clarus) are “free from the isthmus”

Xenisthmus africanus Smith 1958 -anus (L.), belonging to: Africa, referring to its occurrence off Mozambique, western Indian Ocean, identified as a separate species from its Red Sea congener, X. polyzonatus

Xenisthmus aureus Chang, Shen & Chen 2025 Latin for golden, referring to golden-yellow marks on body and smaller golden-yellow marks or short bars on sides

Xenisthmus balius Gill & Randall 1994 Latinization of baliós (βαλιός), spotted or dappled, referring to “reticulate mottling of irregular, brown to dark grey-brown melanophores” on head and body

Xenisthmus chapmani (Schultz 1966) in honor of American ichthyologist Wilbert M. Chapman (1910–1970), who collected holotype

Xenisthmus chi Gill & Hoese 2004 22nd letter of Greek alphabet (χ), referring to X-shaped markings on body

Xenisthmus clarus (Jordan & Seale 1906) Latin for bright or distinct (i.e., clear), referring to its translucent, scaleless body

Xenisthmus eirospilus Gill & Hoese 2004 eiro (εἴρω), to join in lines or string together; spilus, from spílos (σπίλος), mark or spot, referring to prominent mid-side pattern of closely spaced dark spots

Xenisthmus nigrolateralis Chen, Harefa, Jiang & Chang 2022 nigro-, from niger (L.), dark or black; lateralis (L.), of the side, referring to broad, deep-brown lateral stripe from rear of gill opening to caudal-fin base

Xenisthmus oligoporus Gill, Bogorodsky & Mal 2017 olígos (ὀλίγος), few or scanty; porus, from póros (πόρος), pore, referring to relatively low number of sensory pores on head compared with congeners

Xenisthmus polyzonatus (Klunzinger 1871) polý- (πολύ-), many; zonatus (L.), banded, referring to 12–13 broad, black crossbands on body

Xenisthmus semicinctus Gill & Hoese 2004 semi-, from semis (L.), a half or moiety; cinctus (L.), belted or girdled (but treated as a noun by the authors), referring to dark markings on dorsal part of body