aqua International Journal 21(3)
Volume 21, Issue 3 – 15 July 2015
Stefano Valdesalici and Wolfgang Eberl: Aphyosemion jeanhuberi, a new killifish species of the Aphyosemion ogoense species group (Cyprinodontiformes: Nothobranchiidae), with remarks on the identity of Aphyosemion louessense (Pellegrin, 931), pp. 110-119
Aphyosemion jeanhuberi, new species, is described from the border area between Gabon and Congo (Brazzaville) in the Massif du Chaillu. It can be distinguished from the remaining members of the Aphyosemion ogoense species group by a unique colouration of males. Despite obvious differences and its geographically isolated distribution range, specimens of this species have been hitherto erroneously considered as belonging to Aphyosemion louessense; remarks on the latter species based on recent collections are given together with an identification key for the species of the Aphyosemion ogoense species group.
Tyson R. Roberts: Mimicry of a Bean Seed by the Amazonian Aspredinid Catfish Amaralia hypsiura (Kner 855), pp. 120-127
Amaralia hypsiura can modify its typically bunocephalid or aspredinid-catfish shape, hiding many of its features including all of its fins, so that it resembles a large bean or seed of the spermatophyte family Leguminosae or Fabaceae. This is accomplished mainly by adpressing both pectoral fins and folding the tail and caudal fin tightly around one side of the body and head. In so doing, Amaralia radically transforms itself from the bilaterally symmetrical form of a vertebrate animal into the radially symmetrical form of a seed. The fish then remains motionless until it unfolds itself. While mimicry of plant parts and camouflage to resemble plants or woody background is well known in fishes, mimicry of a seed apparently has not been reported previously. It possibly facilitates prey capture by Amaralia, which feed on the large yolky eggs of orally-brooding or otherwise parentally-guarding loricariid catfishes. It might also be involved in predator avoidance. Mimicry and camouflage involving vegetation is now known in a wide variety of freshwater and marine fishes.
Stefano Valdesalici, Dalton Tavares Bressane Nielsen and Didier Pillet: Moema beucheyi (Teleostei: Cyprinodontiformes: Rivulidae), a new annual killifish from the Río Madeira basin, Bolivian Amazon, pp. 128-135
Moema beucheyi, new species, is described from a seasonal pool in the Río San Miguel drainage, Río Madeira basin, Bolivian Amazon. The new taxon is similar to M. heterostigma, M. ortagai/M. quiii, M. pepotei, and M. piriana in that males possess filamentous rays on the pectoral-fin tips, and to M. heterostigma and M. ortegai in exhibiting an orange color pattern on the body and fins. M. beucheyi differs from all known congeners by presence of distinctive orange lateral stripe outlined by a series of brown dots on the caudal fin, greenish-grey pigmentation on the ventral portion, and greater numbers of scales in the transverse and circumpeduncular series.
Dalton Tavares Bressane Nielsen and Christian Silva Pinto: Melanorivulus imperatrizensis, a new species of killifish (Cyprinodontiformes: Rivulidae) from the rio Tocantins basin, Brazil, pp. 136-143
Melanorivulus imperatrizensis, new species, collected in a small spring, at the middle rio Tocantins basin, northeast Brazil, is described. Melanorivulus imperatrizensis differs from all other species of the genus Melanorivulus by possessing all fins orange (vs. orange fins absent in other species of Melanorivulus or orange distal stripe on M. dapazi). The hypothesized close relationship between M. imperatrizensis and M. parnaibensis suggests a historical biogeographic relationship between Southern Amazonian tributaries and Rio Parnaíba.
Hamed Mousavi-Sabet, Hossein AnvariFar and Fahime Azizi: Alburnoides tabarestanensis, a new species of riffle minnow from the southern Caspian Sea basin in Iran (Actinopterygii: Cyprinidae), pp. 144-152
Alburnoides tabarestanensis n. sp., is described from Tajan River in the southern Caspian Sea basin, Mazandaran Province, northern Iran. It is distinguished from the remaining Alburnoides species occurring in Iranian freshwaters by a combination of the following characters: a completely scaleless ventral keel; a terminal mouth with the tip of the mouth cleft between level of middle of pupil and lower margin of pupil; 47-52 lateral line scales to posterior margin of hypurals; 2.5-4.2 pharyngeal teeth; usually 16-18 scales around caudal peduncle; typically 39-41 total vertebrae; caudal vertebral region equal or slightly longer than abdominal region (most frequent vertebral formulae 19+20, 20+20 and 20+21); usually 8½ branched dorsal-fin rays; usually 12½ or 13½ branched anal fin rays; usually 7 branched pelvic fin rays; 11-13 branched pectoral fin rays; and usually 8 or 9 total gill rakers in the outer row on first left arch.
|Dimensions||26.6 × 20.3 × 0.3 cm|
|print or online||