HAPLONISCIDAE Hansen, 1916
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publication ID |
https://doi.org/ 10.1080/0022293021000030844 |
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persistent identifier |
https://treatment.plazi.org/id/03998778-D051-FFE4-FDE6-FDC8348A05AB |
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treatment provided by |
Felipe |
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scientific name |
HAPLONISCIDAE Hansen, 1916 |
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Family HAPLONISCIDAE Hansen, 1916 View in CoL
Synonym: Haploniscini Hansen, 1916: 28.
Haploniscidae : Gurjanova, 1933: 402; Menzies, 1962: 94; Wolf, 1962: 49; Menzies and George, 1972: 107; Lincoln, 1985b: 659.
Diagnosis. Janiroidea with free cephalon; blind; oval or subrectangular body, dorsoventrally flattened; all pereonites wider than long, free or fused. Pleotelson composed of a single somite, fused with last pereonite in some genera. Anus separated from branchial chamber by robust pre-anal bar. Antenna shorter than body, antenna 1 shorter than 2. Mandible with incisor and lacinia only on left mandible, molar elongate and truncated, palp three-segmented with article 3 reflexed. Pereopods 1–7 ambulatory, dactylus with single claw. Uropods small, uniramous, ventral, subterminal, one- or two-segmented.
Key to the genera of Haploniscidae (figures 2, 3)
1 Pleotelson with posterior part tapering to a blunt point........ 2
– Pleotelson truncated or broadly rounded posteriorly......... 3
2 Uropods not concealed, set close together, ventral to the anal valves; female opercular
pleopod fringed with long plumose distal setae. Aspidoniscus Menzies and Schultz, 1968 – Uropods concealed; female opercular pleopod fringed with simple short marginal setae
................. Abyssoniscus Birstein, 1971
3 Antenna 2 with peduncular articles flattened, article 3 elongate and grooved, article 4
short, articles 5 and 6 fused and apically prolonged, flagellum small and slender, subterminal (figure 2C).......... Antennuloniscus Menzies, 1962
– Antenna 2 unmodified................. 4
4 Pereonites 5–7 free (figure 3D)......... Chandraniscus n. gen. – Pereonites 5 and 6 fused, or 6 and 7 fused, or 7 fused with pleotelson, or 5–7 and
pleotelson fused together................. 5
5 Pereonites 5–7 fused with the pleotelson to form a single segment (figure 2B)....
................. Hydroniscus Hansen, 1916 – Pereonites 5 and 6 fused, or 6 and 7 fused, with pleotelson........ 6
6 Pereonites 5–7 without any pronounced anterolateral angles in anterior pereonites. 7
– Pereonites 5–7 free, with one or more pereonites 2–4 having prolonged anterolateral
angles (figure 3B)........... Chauliodoniscus Lincoln, 1985
7 Pereonites 5–7 fused between each other, and pereonite 7 fused or not fused with
pleotelson but pereonite 7 not reduced (figure 2A).. Haploniscus Richardson, 1908 – Posterior pereonites fused mid-dorsally between each other and with pleotelson, and pereonite 7 much reduced in adult, conspicuously shorter and narrower than pereonite
6, and pleotelson with posterolateral angles conspicuously produced (figure 3C)...
................. Mastigoniscus Lincoln, 1985
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