Hadziidae S. Karaman, 1943

Myers, A, 2013, A Phylogeny and Classification of the Senticaudata subord. nov. (Crustacea: Amphipoda), Zootaxa 3610 (1), pp. 1-80 : 35-36

Hadziidae S. Karaman, 1943

Type genus. Hadzia S. Karaman, 1932 .

Diagnostic description. Body laterally compressed or subcylindrical. Eyes absent. Antennae 1–2 calceoli absent. Antenna 1 longer than antenna 2; peduncular article 1 subequal to, or longer than article 2; article 2 longer than article 3; article 3 shorter than article 1; peduncular articles 1–2 not geniculate; accessory flagellum present or absent; if present short or minute. Antenna 2 peduncular article 1 not enlarged. Mandible molar triturating; palp symmetrical or absent. Maxilla 1 basal endite setose along medial margin; palps symmetrical. Labium inner lobes vestigial or absent. Pereonites stalked (with proximal restriction or complete suture); sternal gills absent; sternal blisters absent; oostegites fringing setae simple. Gnathopod 1 subchelate; similar in males and females (not sexually dimorphic); smaller (or weaker) than gnathopod 2; propodus palm with peg-like robust setae along palmar margin or without robust setae along palmar margin. Gnathopod 2 subchelate; similar in males and females (not sexually dimorphic); carpus slightly produced along posterior margin of propodus or not produced along posterior margin of propodus, projecting between merus and propodus. Pereopods 3–4 not sexually dimorphic. Pereopod 4 with well developed posteroventral lobe or with small posteroventral lobe or without posteroventral lobe. Pereopod 5 shorter than pereopod 6; coxa with large anteroventral lobe or with small anteroventral lobe. Pereopod 7 longer than pereopod 5. Pleonites 1–3 without dorsal carinae. Urosomites 1–3 free; with or without slender or robust dorsal setae. Urosomite 1 with or without large distoventral robust seta. Urosomite 2 with pair of dorsal concavities each with 1–3 small setae or without dorsal setae. Uropod 1 with 1 or 2 basofacial robust setae. Uropod 3 not sexually dimorphic; biramous; endopod minute or shorter than exopod or subequal to exopod. Telson deeply cleft ; dorsal or lateral robust setae present; apical robust setae present.

Habitat. Freshwater, marine, epigean and hypogean.

Remarks. Hadziids and melitids have traditionally been considered as separate family level groups. We find it difficult to separate them because of so much character state overlap even though we can see the ‘jizz’. But they may separate on the palm of gnathopod 2 which appears to have a double row of robust setae in hadziids and not in melitids. We leave them as separate. Psammoniphargus Ruffo, 1956 is an odd genus with a vestigial mandibular palp. It has been considered as a hadziid. However it is very similar to eriopisids except that it has no inner lobes on the labium, even though the second article on the outer ramus of uropod 3 can be interpreted as long, common in the eriopisids. The other problem is that Psammoniphargus has sexually dimorphic second gnathopods – not a eriopisid character. It’s a mystery and remains as a provisional hadziid. Zhadia, Lowry & Fenwick, 1983 moved to Maeridae .

Included genera. Allotexiweckelia Holsinger, 1980 ; Alloweckelia Holsinger & Peck, 1968 ; Bahadzia Holsinger, 1985 ; Caribdzia Stock, 1985 ; Croidzia Stock, 1985 ; Dulzura J.L. Barnard, 1969 b; Guadzia Stock, 1985 ; Hadzia S. Karaman, 1932 ; Hispadzia Stock, 1985 ; Holsingerius Barnard & Karaman, 1982; Indoweckelia Holsinger & Ruffo, 2002 ; Jamadzia Stock, 1985 ; Liagoceradocus J.L. Barnard, 1965 ; Mayaweckelia Holsinger, 1977 ; Metahadzia Stock, 1977 ; Metaniphargus Stephensen, 1933 a; Mexiweckelia Holsinger & Minckley, 1971 ; Paramexiweckelia Holsinger, 1982 ; Paraweckelia Shoemaker, 1959 ; Protohadzia Zimmerman & Barnard, 1977 ; Psammoniphargus Ruffo, 1956 ; Radoweckelia Stock, 1985 ; Saliweckelia Stock, 1977 ; Texiweckelia Holsinger, 1980 ; Texiweckeliopsis Barnard & Karaman, 1982; Tuluweckelia Holsinger, 1990 ; Weckelia Shoemaker, 1942 ; Zombiweckelia Stock, 1985 .

Distribution. Cosmopolitan.