Hiroshi Morino

Phylogenetic Relationships Within the Genus Jesogammarus (Crustacea, Amphipoda, Anisogammaridae) Deduced from Mitochondrial COI and 12S Sequences

Abstract The genus Jesogammarus contains 16 species in two subgenera, Jesogammarus and Annanogammarus. To examine relationships among species in the genus, a molecular phylogenetic study including eight species of the former subgenus and four of the latter was conducted using partial DNA sequences of the mitochondrial COI and 12S rRNA genes. MP, NJ, and ML trees based on the combined COI and 12S data indicated monophyly of the subgenus Annanogammarus, though the monophyly of Jesogammarus was left unresolved. Consistent with few morphological differences, Jesogammarus (A.) naritai and J. (A.) suwaensis showed low genetic differentiation and did not show reciprocal monophyly, which suggests a close affinity of these taxa.

Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. -II. The genus Platorchestia

Four species of the genus Platorchestia Bousfield are described from Taiwan, e.g., P. pacifica n. sp., P. joi Stock and Biembaum, 1994, P. japonica (Tattersall,l922) and P. humicola (Martens, 1868). The former two species, together with P. platensis (Kmyer, 1845) and P. munmui Jo, 1988, compose a closely related species cluster. P. pacifica n. sp. was found on almost all the coast of the mainland and neighboring islands in Taiwan, while the other three species were found in the mainland north of23.5°N.

Redefinition of Talorchestia (Amphipoda: Talitridae) with description of a new species from the tropical west Pacific

ABSTRACT The genus Talorchestia is redefined on the basis of new concepts advanced by Bousfield (1982). It comprises 4 Indo-Pacific species: Talorchestia gracilis, T. spinipalma, T. martensii, and a new species that is described from specimens from the Philippines and Queensland under the name of Talorchestia palawanensis, new species. This new amphipod is closely related to T. spinipalma, which is refigured.

A New Freshwater Species of the Genus Jesogammarus (Crustacea: Amphipoda: Anisogammaridae) from Northern Japan

Abstract A new species of anisogammarid amphipod, Jesogammarus (Jesogammarus) mikadoi sp. nov., is described from freshwater habitats in northern Honshu, Japan. The species is distinguished from its congeners by having dorsal setae on pereonites 5–7 and pleonites 1–3.

Paternity analysis in an egg‐carrying aquatic insect Appasus major (Hemiptera: Belostomatidae) using microsatellite DNA markers

The giant water bug Appasus major exhibits a peculiar reproductive behavior where females lay eggs on the backs of males. A male and female pair performs frequent repeat copulations during the oviposition behavior, and the male carries the deposited eggs until hatching. Such characteristic behaviors predict that the eggs are fertilized by the brooding males. If males carry eggs of other unrelated males, the egg carrying will drastically decrease the fitness of the carriers. In this study, we examined genetic relationships between the 489 eggs and nine males carrying them collected from the field, using microsatellite DNA markers. We revealed that in total, 28.4% of the eggs were of other male origin. This is the first report of frequent brood parasitism in an aquatic egg‐carrying hemipteran insect. The brood parasitism is adaptive for the females probably because it enables them to increase the chance of oviposition, or it can equalize motility risk of the eggs of each mate.

TWO PLATORCHESTIA SPECIES (AMPHIPODA, TALITRIDAE) FROM ISRAEL

Two Platorchestia species arc recorded from Israel and the Sinai: P. platensis from near the sea shore at Naqaz Jirada (Sinai), and P. monodi from near springs and wells at En Hameara in the Negev Desert. Platorchestia monodi is distinguished from P. platensis in having a smooth palmar margin on the propod of male gnathopod 2, and the dactyl of male gnathopod 1 distinctly shorter than the propod palm. The occurrence of inland species of Platorchestia is discussed.

A revision of Eogammarus Birstein, 1933 (Crustacea, Amphipoda, Anisogammaridae), with a description of a new species

A revision of the genus Eogammarus is made based on type material and on collections from numerous localities. The following eight species are redescribed: E. kygi (Derzhavin, 1923), E. barbatus (Tzvetkova, 1965), E. confervicolus (Stimpson, 1856), E. oclairi Bousfield, 1979, E. psammophilus Bousfield, 1979, E. schmidti (Derzhavin, 1927), E. possjeticus (Tzvetkova, 1967), and E. tiuschovi (Derzhavin, 1927). A new species is described under the name of E. itotomikoae sp. nov. Eogammarus sinensis Ren, 1992 is relegated to a junior synonym of E. possjeticus. Eogammarus turgimanus is transferred into Jesogammarus. In the descriptions of species, special attention is paid to the following characters: the condition of the posterodistal seta on the peduncular article 1 of antenna 1, the number and length ratio of aesthetascs on antenna 1, the setal ornamentation of the peduncular article 1 of antenna 2, the setae ornamentation of the palp article 1 of the maxilla 1, the number of retinacula on the pleopods, and the dorsal condition of pleonites. A key to the species of Eogammarus is provided.

Three new species of the genus Gammarus (Crustacea, Amphipoda, Gammaridae) from Yunnan, China

Abstract Three new species of the genus Gammarus are described from Lijiang, Yunnan Province, South China. Gammarus elevatus sp. nov. is characterized by mid-dorsal keel on pleonites 1-3 and compressed elevation on urosomites 1-2; G. denticulatus sp. nov. by many small spinules and setae on pleonites 1-3; G. stagnarius sp. nov. by lack of calceoli on antenna 2 and shorter inner ramus of uropod 3. These amphipods are compared with other known Gammarus species from China.

A new landhopper species of Myanmarorchestia (Crustacea: Amphipoda: Talitridae) from Yunnan, China

ABSTRACT A new landhopper talitrid, Myanmarorchestia nunomurai Nakano and Morino, sp. nov., from Yunnan Province, China is described. Since species of Myanmarorchestia were known only from Mt. Victoria of the Arakan Mountains of Myanmar, this is the first record of the genus from China. Myanmarorchestia nunomurai is characterised by its coxal gills on gnathopod 2 to pereopod 6 without filamentous projections while the other congeners from Myanmar possess some/all of the coxal gills with filamentous projections. Additionally, M. nunomurai can be diagnosed by the sexually dimorphic uropod 2, of which the outer ramus bears a robust seta on the midlateral surface and a few rows of small teeth on the middle to distodorsal surface. http://zoobank.org/urn:lsid:zoobank.org:pub:3C014FFC-F4D6-4F18-8188-33672367ABB1