| Ptychochromis oligacanthus | EN | maroamalona | collection record | present | — | 1926 | GBIF: MNHN 1999-0198 |
| Ptychochromis oligacanthus | EN | SAHAMBAVY RIVER, AT AMPATAKA VILLAGE ON ROAD BETWEEN VAGAINDRANO AND RANOMERA ROADS | collection record | present | —(river) | 1998 | GBIF: FishBase AMNH 228072 |
| Ptychochromis oligacanthus | EN | tulear | collection record | present | — | 1926 | GBIF: MNHN 1999-0225 |
| Ptychochromis oligacanthus | EN | Manombo Reserve, southeastern Madagascar | collection record | present | — | — | GBIF: UMMZ 240357 |
| Ptychochromis oligacanthus | EN | FORET CLASSEE DE MANOMBO, TAKOANDRA RIVER | collection record | present | —(river) | 1999 | GBIF: FishBase AMNH 231352 |
| Ptychochromis oligacanthus | EN | MANAMPATRANA RIVER, 12 KILOMETERS NORTH OF FARAFANGANA ON NATIONAL ROUTE 12 | collection record | present | —(river) | 1998 | GBIF: FishBase AMNH 228074 |
| Ptychochromis oligacanthus | EN | Mananjary, estuary of river mananjary behind marketplace, ca. 1 kilometer from sea | collection record | present | —(river) | 1988 | GBIF: MCZ 169355 |
| Ptychochromis oligacanthus | EN | MANANJARY, ESTUARY OF RIVER MANANJARY BEHIND MARKETPLACE, ca. 1 KILOMETER FROM SEA | collection record | present | —(river) | 1988 | GBIF: FishBase AMNH 88018 |
| Ptychochromis oligacanthus | EN | Madagascar, Mananjary, purchased behind market, estuary of River Mananjary | collection record | present | —(river) | 1988 | GBIF: USNM USNM 301496 |
| Ptychochromis oligacanthus | EN | Large bay lake behind dunes, about 100 meters from sea, 1 kilometer south of turnoff from Maralambo-Mananjary Road, east of road | collection record | present | —(lake) | 1988 | GBIF: USNM USNM 301516 |
| Ptychochromis oligacanthus | EN | TAMATAVE PROVINCE, BAY LAKE BEHIND FIRST DUNE ca. 100 m FROM SEA, EAST OF ROAD BY SALEHY VILLAGE, 1 km SOUTH OF TURNOFF FROM MAROLAMBO-MANANJARY ROAD | collection record | present | —(lake) | 1990 | GBIF: FishBase AMNH 97117 |
| Ptychochromis oligacanthus | EN | SMALL AFFLUENT TRIBUTARY RIVER MANGORO, AT BRIDGE ca. 5 KILOMETERS NORTH ON WAY TO FERRY | collection record | present | —(river) | 1988 | GBIF: FishBase AMNH 88094 |
| Ptychochromis oligacanthus | EN | VATOMANDRY, ON WAY TO MARALAMBO | collection record | present | — | 1988 | GBIF: FishBase AMNH 88076 |
| Ptychochromis oligacanthus | EN | TOAMASINA (TAMATAVE) MAIN MARKETPLACE IN TOWN CENTER, CAUGHT NEARBY | collection record | present | — | 1988 | GBIF: FishBase AMNH 88117 |
| Ptychochromis oligacanthus | EN | Tamatave | collection record | present | — | 1976 | GBIF: SAIAB 15436 |
| Ptychochromis oligacanthus | EN | Toamasina, fish market | collection record | present | — | 1912 | GBIF: NRM 10513 |
| Ptychochromis oligacanthus | EN | BRIDGE OVER CANAL DE PANGALANE ON TOAMASINA (TAMATAVE) TO FENOARIVO (FENERIVE) ROAD ca. 25 KILO- METERS NORTH OF TOAMASINA | collection record | present | — | 1988 | GBIF: FishBase AMNH 88140 |
| Ptychochromis oligacanthus | EN | Ambilo, Lake Rosoabe | collection record | present | —(lake) | 1911 | GBIF: SAIAB 45666 |
| Ptychochromis oligacanthus | EN | Rivière Mangarahara, 16 km. de Mandritsara | collection record | present | —(river) | — | GBIF: MHNG MHNG-ICHT-2623.049 |
| Ptychochromis oligacanthus | EN | Nosy Be, Lake Djabala, site B | collection record | present | —(lake) | — | GBIF: FGMV 2002.F-A77 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.387, 48.243 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI FGMV 2002.F-B03 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.387, 48.241 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI FGMV 2002.F-A77 |
| Ptychochromis oligacanthus | EN | Lac De Deux Soures, Nosy Be (southern lake pair (?), or one visible from road | collection record | present | —(lake) | — | GBIF: UMMZ 237493 |
| Ptychochromis oligacanthus | EN | Lac Djabala, Nosy Be | collection record | present | —(lake) | 1996 | GBIF: UMMZ 238462 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.385, 48.244 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI FGMV 2002.F-B45 |
| Ptychochromis oligacanthus | EN | Nosy Be, Lake Djabala, site 2 | collection record | present | —(lake) | — | GBIF: FGMV 2002.F-B44 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.332, 48.231 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI RDR0760 |
| Ptychochromis oligacanthus | EN | Nosy Be, Lake Antsahamanavaka | collection record | present | —(lake) | — | GBIF: FGMV 2002.F-B58 |
| Ptychochromis oligacanthus | EN | Antsidia | collection record | present | — | — | GBIF: RDR0760 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.325, 48.242 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI FGMV 2002.F-B58 |
| Ptychochromis oligacanthus | EN | Lac Amparihibe, Nosy Be | collection record | present | —(lake) | — | GBIF: UMMZ 237494 |
| Ptychochromis oligacanthus | EN | Nosy Be, Lake Bempazava | collection record | present | —(lake) | — | GBIF: FGMV 2002.F-B62 |
| Ptychochromis oligacanthus | EN | Lac Bempazava, Nosy Be | collection record | present | —(lake) | 1996 | GBIF: UMMZ 237496 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.317, 48.235 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI RDR0753 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.315, 48.210 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI RDR0805 |
| Ptychochromis oligacanthus | EN | Amparihibe | collection record | present | — | — | GBIF: RDR0805 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.303, 48.235 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI RDR0776 |
| Ptychochromis oligacanthus | EN | Nosy Be, Lake Anjavibe | collection record | present | —(lake) | — | GBIF: FGMV 2002.F-A70 |
| Ptychochromis oligacanthus | EN | Antsimony | collection record | present | — | — | GBIF: RDR0775 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.297, 48.223 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI FGMV 2002.F-A70 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.295, 48.226 | collection record | present | — | — | GBIF: Mined from GenBank, NCBI RDR0786 |
| Ptychochromis oligacanthus | EN | Lac Anjavibe, Nosy Be | collection record | present | —(lake) | 1996 | GBIF: UMMZ 237497 |
| Ptychochromis oligacanthus | EN | Anjavola | collection record | present | — | — | GBIF: RDR0785 |
| Ptychochromis oligacanthus | EN | Andranomaloto Riviere, trib. of Mananjeba Riviere | collection record | present | —(river) | 1996 | GBIF: UMMZ 237499 |
| Ptychochromis oligacanthus | EN | GBIF record at -13.052, 49.021 | collection record | present | — | 2024 | GBIF: iNaturalist 248017922 |
| Ptychochromis oligacanthus | EN | 7 KILOMETERS NORTH OF MANANJARY IN THE PANGA- LANES, 100 METERS UPSTREAM FROM 88-25, ca. 0.25 KILO- METER FROM SEA (FIRST FRESHWATER CHANNEL) | collection record | present | —(stream) | 1988 | GBIF: FishBase AMNH 88032 |
| Ptychochromis oligacanthus | EN | Barcode sample site (FGMV 2002.F-B62) | collection record | present | — | 2002 | Vences et al. 2022 DNA barcode library: FGMV 2002.F-B62 |