Blue streamgoby Sicyopterus lagocephalus, copyright Kirby Morejohn.

Belongs within: Gobionellidae.

The Sicydiinae are a group of gobies with a single row of teeth each side of the lower jaw and  fleshy lobe each side of the pelvic fraenum (Smith 1960).

Characters (from Smith 1960, as Sicydiaphiinae): Elongate body, naked, partly or fully scaly. Two dorsal fins. Pelvics cup-shaped, free or adnate to belly, fraenum with fleshy lobe each side. Single row of simple teeth in lower jaw, often labial teeth.

<==Sicydiinae [Sicydiaphiidae, Sicydiaphiinae]
    |--Sicyopus balinense (Bleeker 1856–1857) [=Sicydium balinense]M58
    |--Pleurosicyops Smith 1959S59
    |    `--*P. timidus Smith 1959S59
    |--Luposicya Smith 1959S59
    |    `--*L. lupus Smith 1959S59
    |--Bryanina Fowler 1932S59
    |    `--*B. inana Fowler 1932S59
    |--Pyosicus Smith 1960S60
    |    `--*P. niger Smith 1960S60
    |    |--S. elegans (Steindachner 1880) [=Sicydium elegans; incl. St. semoni Weber 1895]M58
    |    `--S. stevensoniT90
    |--Bryaninops Smith 1959S59
    |    |--*B. ridens Smith 1959S59
    |    `--B. natans Larson 1985MM09
    |--Pleurosicya Weber 1913S59
    |    |--*P. boldinghi Weber 1913S59
    |    |--P. annandalei Hornell & Fowler 1922S59
    |    `--P. mossambica Smith 1959S59
    `--Sicyopterus Gill 1860S59 [incl. Sicydium Günther 1861H27]
         |--*S. stimpsoni Gill 1860S59
         |--S. acutipinnis (Guichenot 1863) [=Cotylopus acutipinnis, Sicydium acutipinnis]S59
         |--S. crassus Herre 1927H27
         |--S. cynocephalus (Valenciennes 1837) [=Sicydium cynocephalum]M58
         |--S. extraneus Herre 1927H27
         |--S. fasciatus (Day 1878) [=Sicydium fasciatum]S59
         |--S. fuliag Herre 1927H27
         |--S. gymnauchen (Bleeker 1858) [=Sicydium gymnauchen]M58
         |--S. japonicusH27
         |--S. lacrymosus Herre 1927H27
         |--S. lagocephalus (Pallas 1774) [=Sicydium lagocephalus; incl. Sicydium laticeps Val. 1837]S59
         |--S. longifilisH27
         |--S. macrostetholepisT90
         |--S. ouwensi Weber 1913M58
         |--S. panayensis Herre 1927H27
         |--S. parvipinnis (Guichenot 1863) [=Cotylopus parvipinnis, Sicydium parvipinnis]S59
         |--‘Sicydium’ plumieriSWK87
         `--S. taeniurusH27 [=Sycidium taeniurumP89]

*Type species of generic name indicated


[H27] Herre, A. W. 1927. Gobies of the Philippines and the China Sea. Bureau of Printing: Manila.

[MM09] Moore, G., & S. Morrison. 2009. Fishes of three North West Shelf atolls of Western Australia: Mermaid (Rowley Shoals), Scott and Seringapatam Reefs. Records of the Western Australian Museum Supplement 77: 221–255.

[M58] Munro, I. S. R. 1958. The fishes of the New Guinea region: a check-list of the fishes of New Guinea incorporating records of species collected by the Fisheries Survey Vessel “Fairwind” during the years 1948 to 1950. Papua and New Guinea Agricultural Journal 10 (4): 97–369 (reprinted: 1958. Territory of Papua and New Guinea Fisheries Bulletin no. 1).

[P89] Perugia, A. 1889. Elenco dei pesci raccolti dal Dott. Elio Modigliani nelle Isole di Nias e di Sumatra. Annali del Museo Civico di Storia Naturale di Genova, Serie 2a, 7: 269–277.

[S59] Smith, J. L. B. 1959. Gobioid fishes of the families Gobiidae, Periophthalmidae, Trypauchenidae, Taenioididae and Kraemeriidae of the western Indian Ocean. Ichthyological Bulletin 13: 185–225.

[S60] Smith, J. L. B. 1960. Fishes of the family Gobiidae in South Africa. Ichthyological Bulletin 18: 299–314.

[SWK87] Snyder, N. F. R., J. W. Wiley & C. B. Kepler. 1987. The Parrots of Luquillo: Natural history and conservation of the Puerto Rican parrot. Western Foundation of Vertebrate Zoology: Los Angeles.

[T90] Taguchi, S. 1990. Nihon no Sakana. Kogakukan: Tokyo.

[T09] Thacker, C. E. 2009. Phylogeny of Gobioidei and placement within Acanthomorpha, with a new classification and investigation of diversification and character evolution. Copeia 2009 (1): 93–104.

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