Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Siluriformes
(Catfish) > Mochokidae
(Squeakers or upside-down catfishes)
Etymology: Microsynodontis: Greek, mikros = small + Greek, synodon = with the teeth growing all together (Ref. 45335); hirsuta: Species name from the Latin hirsutus, meaning hairy; in reference to the long tubercles on the dorsal and lateral surfaces of the head, which gives the species a somewhat hairy appearance of the head (Ref. 52369).
Environment / Climate / Range
Freshwater; demersal; pH range: 5.0 - 5.0. Tropical; 22°C - 22°C (Ref. 52369)
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 6.8 cm SL male/unsexed; (Ref. 52369)
Morphology | Morphometrics
soft rays: 11 - 12;
Vertebrae: 36 - 37. Body compressed (Ref. 52369). Predorsal profile gently convex, postdorsal body sloping gently ventrally (Ref. 52369). Head depressed and broad, acutely rounded when viewed laterally and with rounded snout margin when viewed from above (Ref. 52369). Long tubercles on the dorsal and lateral surfaces of the head (Ref. 52369). Eye ovoid, horizontal axis longest (Ref. 52369). Mouth inferior and crescent-shaped; lips plicate (Ref. 52369). Barbels in three pairs; maxillary barbel long and slender, extending to just beyond base of last pectoral-fin ray; inner mandibular-barbel origin close to midline, extending to base of pectoral spine and with 2 short, thin branches on anterior half and 3-5 long, thin branches on posterior half; outer mandibular barbel originates posterolateral of inner mandibular barbel, extending to middle of pectoral-fin base and with 3-5 long, thin branches (Ref. 52369). Gill openings narrow, extending from immediately ventral to posttemporal to immediately ventral to base of pectoral spine (Ref. 52369). Dorsal fin located at anterior third of body, with convex margin; dorsal-fin spine long, stout and straight, smooth on both anterior and posterior margins (Ref. 52369). Adipose fin long, extending for most of postdorsal distance; margin slightly convex for entire length and posterior end deeply incised (Ref. 52369). Caudal fin rounded, with i,6,6,i principal rays (Ref. 52369). Anal-fin base located ventral to posterior half of adipose fin, with iv,7-8 rays and convex margin (Ref. 52369). Pelvic-fin origin at vertical ventral to posterior end of dorsal-fin base, with slightly convex margin (Ref. 52369). Pectoral-fin spine slightly curved and stout; anterior spine margin with 12-35 small serrations along entire length of spine, serrations antrorse on distal two-thirds and anteriorly directed on proximal third; posterior spine margin with 9-13 strong serrations along entire length (Ref. 52369). Lateral line complete and midlateral (Ref. 52369). Dorsal and lateral surfaces of head and body brownish gray, fading to dirty cream on ventral third of body, belly, and ventral surface of head in preserved specimens (Ref. 52369). Snout with a series of cream spots delineating anterior and posterior nares; cheek region with one or two cream spots immediately ventral to orbit; cream band encircling nape at supraoccipital (Ref. 52369). Dorsal third of body with series of four cream vertical bar-shaped marks extending beyond lateral midline of body: first at middle of dorsal-fin base, second at adipose-fin origin, third at middle of adipose-fin base and last on caudal peduncle immediately posterior to adipose fin (Ref. 52369). Ventral third of flanks with a longitudinal series of six to eight cream spots or vertical bar-shaped marks (Ref. 52369). Pectoral and pelvic fin rays with brownish gray spots arranged in two or three bands; dorsal- anal- and caudal-fin rays brownish gray, with hyaline interradial membranes (Ref. 52369). Coloration of juveniles similar, except for being more brown than gray dorsally, a cream belly with brown spotting on posterior half, and dorsal-, anal- and caudal-fin rays with brown spots arranged in one or two bands (Ref. 52369).
Africa: Ntem River, Gabon (Ref. 52369).
Found in a fast-flowing creek over a rock/pebble substrate (Ref. 52369).
Ng, H.H., 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa 531:1-52.
IUCN Red List Status (Ref. 90363)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
CollaboratorsPicturesStamps, CoinsSoundsCiguateraSpeedSwim. typeGill areaOtolithsBrainsVision
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5002 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01620 (0.00725 - 0.03617), b=2.97 (2.78 - 3.16), based on LWR estimates for this Subfamily-BS (Ref. 93245
Trophic Level (Ref. 69278
): 3.0 ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .