Eogmelina moldavica Copilaş-Ciocianu & Ionesi, 2024, gen. et sp. nov.
Creators: name: Copilaş-Ciocianu, Denis
name: Ionesi, Viorel
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Gammaridae
Eogmelina
Eogmelina moldavica

description: † Eogmelina moldavica gen. et sp. nov. (fig. 5)
Zoobank LSID urn:lsid:zoobank.org:act:9447 24CC- 1883 -4F9E-B000-F590F254163E
Type material. Holotype (inventory No. 8236, Vlădiceni quarry) male in precopulatory pair, 14.6 mm, lateral impression (fig. 5A). Paratype (inventory No. 8236, Vlădiceni quarry) female in the same precopulatory pair, 12.4 mm, lateral impression (fig. 5A). Additional material: male (inventory No. 8237 part and counterpart, Vlădiceni quarry), 18.8 mm, lateral impression (fig. 5B); female (inventory No. 8238, Iași City), 15.44 mm, lateral impression (fig. 5C); female (inventory No. 8239 part and counterpart, Vlădiceni quarry), ca. 11.2 mm, dorso-lateral impression (fig. 5D).
Type locality and age. Vlădiceni quarry (47.13442 N, 27.65734 E), Cryptomactra Formation, Tortonian international stage/ Bessarabian regional stage, ca. 10.5 Ma (fig. 1C).
Etymology. The specific epithet moldavica is in reference to the Moldova region of Romania.
Diagnosis. Differs from the only other currently known congener, † Eogmelina prisca gen. et sp. nov. by the presence of a spine on the dorso-posterior margins of the last pereonite and all three pleonites (vs. absent), coxal plate 1 as tall as the corresponding tergite (vs. taller), coxal plate 4 longer than broad (vs. roughly as long as broad).
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General description. Body. Large and robust gammarid (up to 22 mm). A dorsal spine is present on the last pereonite segment as well as on each of the three pleonites. Head length subequal to the combined length of the following two pereonites, lacking rostrum, antennal sinuses superficial, of similar depth. Coxal plates I-IV taller than wide, as tall as the corresponding tergal segments. Epimere 1 distal margin rounded, epimeres 2–3 disto-posterior corner pointed. Urosomites free and flat, devoid of tubercles or spines. Antennae. Antenna 1 reaches 0.3 body length, peduncle is robust and short, subequal to head length, not reaching the distal end of the 4th peduncular article of antenna 2. Peduncular segment 1 subequal to the combined length of segments 2 + 3. Main flagellum longer than peduncle. Accessory flagellum well developed, at least 3-articulated. Antenna 2 longer than antenna 1, reaching 0.35 body length. Peduncle well developed, longer than head and flagellum. Gnathopods. Propodi of both gnathopods rectangular, similar in length and shape, moderately developed (0.1 of body length), palm length subequal to posterior margin. Pereopods. Pereopods 3–4 subequal in length and of similar construction, carpus linear, longer than broad, without signs of expansion. Pereopods 5–7 well developed and robust (at least 0.4 of body length), bases taller than broad, without posterior lobes, propodi subequal to carpi, dactyli moderately developed and relatively straight. Coxae 5–7 progressively smaller posteriorly, poorly visible. Uropods. Uropod 1 rami subequal, shorter than peduncle, of senticaudatan type. Uropod 2 poorly visible, but shorter than uropod 1. Uropod 3 well developed (0.15 of body length), reaching well beyond the distal end of uropod 1, both rami lanceolate longer than peduncle, endopod reaching 0.9 exopod length. Sexual dimorphism. Typical of gammarid amphipods. Females are smaller than males, have more developed coxal plates and smaller gnathopod propodi (fig. 5).
description: Published as part of Copilaş-Ciocianu, Denis & Ionesi, Viorel, 2024, New Miocene fossil taxa illuminate the evolution and paleobiogeography of the Ponto-Caspian gammaroid amphipod radiation, pp. 268-288 in Contributions to Zoology 93 on pages 276-278, DOI: 10.1163/18759866-BJA10061, http://zenodo.org/record/12518921