Early development of LampreyLampetra japonica(Martens, 1868)

Abstract

Studies of lamprey early development have produced major insights into primitive developmental patterns and the evolution of vertebrates. In this study, the effectiveness of the morphological and histological characteristics of Lampetra japonica during embryological, yolk‐sac larval and ammocoete stages were examined. Based on the external and histological morphology, the embryological phase was divided into eight stages, including the zygote, cleavage, blastula, gastrula, neural plate and groove, head protrusion, prehatching and hatching stages. A set of key morphological and histological transformations occurred through the yolk‐sac larval stage, reflecting the larva‐ammocoete transition. In the ammocoete stage, all organ systems were differentiated. Except for the melanophores, the lamprey did not develop any further morphological complexity beyond the ammocoete stage. The total length and body weight of larva and ammocoete generally increased over time. We hope that this study might form the basis for future studies of the phylogenetic development of this interesting group of animals.

Morphology-based taxonomic re-assessment of the Arctic lamprey, Lethenteron camtschaticum (Tilesius, 1811) and taxonomic position of other members of the genus

“…Arctic lamprey, adults from Alaska ca. 90-411 mm TL some feeding on Oncorhynchus tshawytscha, Platichthys stellatus; according to map, Alaskan waters of the Bering Sea basin from the Alaska Peninsula northwards to St. Lawrence Island, U.S.A., Beaufort Sea basin from near Barrow, Alaska, U.S.A. to Anderson River, Northwest Territories, Canada, Yukon River and off Herschel Island (feeding on Japanese common name: Kawa-yatsume, parts of second dorsal and caudal fins blackish in adults, Japan];Novomodnyy and Belyaev 2002: 81 [young lamprey adults ≤ 210 mm in length feed on Oncorhynchus gorbuscha and O. keta smolts ≤ 85 mm in length and O. masou ≥ 120 mm in length in the Amur River estuary and Sakhalin Bay, Russia];Li et al 2019Li et al : 1501Li et al -1502Li et al , 1505Li et al , 1507Li et al , 1509Li et al - 1512 [Tumen and Amur rivers, People's Republic of China, early development]. Lampetra mitsukurii (non…”

Figure 3 from: Naseka AM, Renaud CB (2020) Morphology-based taxonomic re-assessment of the Arctic lamprey, Lethenteron camtschaticum (Tilesius, 1811) and taxonomic position of other members of the genus. ZooKeys 991: 1-67. https://doi.org/10.3897/zookeys.991.54938

“…Arctic lamprey, adults from Alaska ca. 90-411 mm TL some feeding on Oncorhynchus tshawytscha, Platichthys stellatus; according to map, Alaskan waters of the Bering Sea basin from the Alaska Peninsula northwards to St. Lawrence Island, U.S.A., Beaufort Sea basin from near Barrow, Alaska, U.S.A. to Anderson River, Northwest Territories, Canada, Yukon River and off Herschel Island (feeding on Japanese common name: Kawa-yatsume, parts of second dorsal and caudal fins blackish in adults, Japan];Novomodnyy and Belyaev 2002: 81 [young lamprey adults ≤ 210 mm in length feed on Oncorhynchus gorbuscha and O. keta smolts ≤ 85 mm in length and O. masou ≥ 120 mm in length in the Amur River estuary and Sakhalin Bay, Russia];Li et al 2019Li et al : 1501Li et al -1502Li et al , 1505Li et al , 1507Li et al , 1509Li et al - 1512 [Tumen and Amur rivers, People's Republic of China, early development]. Lampetra mitsukurii (non…”